nozzle
Before tighten ing down it should be ascertained
that
the
nozzle
that
the
fuel pipes can be fitted
them.
made
other.
spark plug type washer be used.
holders
for
can
holder
the puspose should
Under
no
conditions should
now
be fitted in place.
is
correctly
without
placed and
bending
be
Trouble. in Service.
The
first
symptoms
usually
headings:
I.
2. Knocking in one (or
3. Engine
fall
Misfiring.
overheating.
in one
of
or
more
injector
more
cylinders).
nozzle
of
the follOWing
trouble
Fuel Pipes.
No
two
of
the
pressure pipes
pump
this in
Place in position the
injection nozzle unions to check that the
square
bend
When fitfing the pipe,
natively a little
then
If the pipe
as
make a
When changing an injection nozzle.
move
end,
pipe.
to the injection nozzles
mind
when replacing.
pipe
at both ends.
the pipe to square
the
other.
is
square to the unions
described
the pipe
leaving
above.
good
entirely.
the
Do
at a time.
no
joint.
other
to
notfitone
it
with
tighten
force
No
force should be used.
Never
tight.
from
are
alike. Keep
the fuel
end
the
other
the unions
first
one
at
will
be needed to
take
off
Never
pump
always
Maintenance.
Injection no!zles should be taken
nation
val
the
operates.
When
good
maintained
cient
every
at
regular
should be
different
combustion conditions in the
and
the
if
the nozzles
1000 hours.
intervals. How long this
is
difficult
conditions
fuel tank
in
first
class
to advise. because
under
and
order.
are
tested twice
out
which the
filtering
it
for
engine
system
is often suffi-
the fuel
and
pipe
fits
and
then
union.
alter-
end and
each end
re-
only
one
bend the
exami-
inter-
engine
are
are
yearly
or
4. loss
5. Smoky exhaust (black).
6.
Often the
trouble
pipe union
engine
This
nozzle to the engine
the
pipe union nut. the
constant, this denotes a
The
from
outwards, on its pipe, and the unions retightened.
After
pipes (to
starting). the engine should be
nozzle sprays into the
at once
unduly
side,
complete unit should be replaced (See Fig.
The
clean
tion cap on the nozzle
of
tenance bench. .
Great
from
working
the skin with ease.
of
power.
Increased fuel consumption.
particular
may
be
nut
on each nozzle in turn, with the
running
will
prevent
engine
complete
the
slackening the unions
or
faulty
greaseproof
getting into contact with the spray,
revolutions.
unit
cylinder
avoid
if
the spray
"wet"
care should be taken to
or
the injection nozzle
unit
pressure
nozzle
determined
at
approximately
fuel being
cylinder,
engine
should then be
head and turned round, nozzle
the possibility
is
"streaky"
then
being
paper
for
will
cause the
or
nozzles causing
by releasing the
1,000
pumped
If after slackening a
revolutions
faulty
air,
nozzle.
of
the
when
in
order.
or
"dribbles"
securely
or
rag with the protec-
attention on the main-
through the
thereby
other
of
turned
it
will
If the spray
obviously
prevent
oil
to
rev/min.
altering
remain
withdrawn
injection
the
engine
until the
be seen
to
one
then the
I 10).
wrapped
the hand
as
penetrate
is
in
the
Nozzles
unless a nozzle tester is
nozzles
With
condition
the less attention the nozzles
so
there
which the
so much,
never
should
are
the cooling system
and
their
effiCient life. In this connection, since
is
no
performance
it
runs with
not
be
removed
available
on hand
other
pays the user to see
for
replacement.
absolutely
item
any
of
the nozzles
maintained
clean fuel
of
the
of
the
34
for
checking
or
in
are
will
need, and
equipment
engine
that
the
out
depends
of
spare
good
used,
upon
engine
order.
Fig. 110-Nozzle Spray Paltern
Page 36
FUEL
4 sucking noise should be heard.
SYSTEM
Fig. Da.l
Fuel
lift
pump components
Pivot pin.
Delivery valve.
I.
2.
Filter gauze. 10.
3. Sediment chamber. U.
4. Inlet valve.
Inlet port.
S.
Rocker arm spring.
6.
7. Rocker arm.
Camshaft eccentric.
8.
9.
Link.
Pun-rod.
Hand priming lever.
12.
Diaphragm spring.
13.
Diaphragm.
14.
Outlet port.
IS.
Section Da.I
DESCRIPTION
The fuel lift pump
is
operated
by
hand priming lever permits pumping a supply
testing purposes.
When the lift pump output
jection pump requirements the fuel in the pumping cham-
ber holds the diaphragm against the pressure
diaphragm spring, and the connecting link allows an
idling movement
the contact between the rocker arm and the eccentric thus
eliminating noise.
OF
THE
FUEL LIFT
is
mounted on the crankcase and
PUMP
an eccentric on the engine camshaft. A
of
fuel for
is
greater than the fuel in-
of
the
of
the rocker arm. A spring maintains
In
a similar manner seal the delivery side
(marked
charge the pum
'OUT') and press the rocker arm inwards to
ling chamber with air.
of
If
the pump
the pump
is
in
good condition the air in the pumping chamber should be
held under compression for two
or
three seconds. Finally
repeat this test, but immediately the pumping chamber
is
charged with air immerse the pump in a bath
of
clean
paraffin and inspect the diaphragm clamping flanges for
signs
of
air leakage.
Lubricate the rocker arm and the rocker arm pin with
clean engine oil and after replacing the pump bleed the
fuel
system
Section Da.3
DISMANTLING AND REASSEMBLING
THE
FUEL
Scribe a mark across the pump body joint flanges for
guidance when reassembling.
Remove the set bolt,
sealing ring, and lift off the filter gauze.
Unscrew the set screws and separate the two halves
the pump body.
Remove the two screws and withdraw the retaining
plate, inlet and outlet valves, and valve gasket from the
upper half
of
the pump body.
Press the diaphragm downwards and turn it clockwise
through an angle
of
90°
from the connecting link. Withdraw the diaphragm and
its return spring from the lower half
Remove the rocker arm pin retaining clips and with-
LIFT
PUMP
detach the dome cover and its
of
to release the diaphragm pull-rod
of
the pump body.
Section Da.2
REMOVING AND REPLACING
FUEL
LIFT
PUMP
Disconnect the two fuel pipes from the body
pump, unscrew the two set bolts securing the pump to the
crankcase and withdraw the pump and its joint washer.
Before replacing the pump. which
is
foregoing procedure, the pump should be tested. In the
of
absence
special test equipment the pump may be tested
as follows:
Immerse the pump in a bath
of
clean paraffin and flush
it through by operating the rocker arm six to eight times.
Remove and empty the pump; seal the suction side
pump, placing a finger firmly over the inlet union (marked
'IN')
and operate the rocker
removal
of
the finger from the inlet union a distinct
arm
several times. Upon
THE
a reversal
of
of
of
the
the
the
Fig.
Da.2
Diaphragm assembly diagram
I.
Pump mounting flange.
:!.
Initial position of diaphragm locating
tab.
3.
Final position
tab.
of
diaphragm locating
35
Page 37
FUEL
SYSTEM
Section Da.4
Main fuel/ilter C01'lf/HJMllIS
1.
Centre bolt.
2. Washer.
3. Filter head.
4. Sealing plug.
Copper washer.
S.
6. Non-return
valve.
).---11
7. Sealing ring.
S.
'0'
9.
E1el1lCDt.
10.
SeaIiDa
II.
Filter
rinI.
base.
ring.
DESCRIPTION
The
main fuel filter
a resin impregnated paper as the filtration medium.
The main parts
lower plate assembly; clamped between which
canister containing the filter element.
'0'
An
boss
its clean side.
The air bleed point, which
filter, is connected
provides continuous air-bleeding
ation.
ring located in an annular groove in the centre
of
the filter head seals the dirty side
OF
THE MAIN FUEL FILTER
is
of
the cross-flow type employing
of
the unit are a die-cast head
of
the filter from
is
on
the clean side
to
the fuel injector leak-off pipe
of
the filter during oper-
is
a metal
Section Da.5
REMOVING AND REPLACING THE MAIN
FUEL FILTER
Disconnect the fuel pipe
the filter head.
Remove the two bolts
and
bracket
The installation
removal' procedure.
Bleed the fuel system
withdraw it from the
of
and
leak-off connections from
and
nuts securing the filter to its
engine~
the fuel filter
is
a reversal
and
of
of
a
the
and
the
draw the pin
spring,
Detach the spring from the priming
Reassembly is a reversal
noting the following.
(I)
flanges are true. They may be lapped to restore
(2) Check
surface does not exceed
(3) The rocker
body;
the body.
(4) Locate the diaphragm return spring in the dia-
the
diaphragm downwards
through
(5) When assembling the two halves
ensure
flange
leaving
securing screws diagonally.
(6) Test the
to
r~lease
and
connecting link.
Ensure
their flatness.
phragm lower protector washer
phragm into the
pull-rod with the connecting link.
before dismantling coincide.
by means
arm
phragm
that
that
this
11
o'clock position (see Fig;
an
that
apd
the
towards the
at
pump
the rocker arm. distance washers,
of
the foregoing procedure
the diaphragm
the wear
arm
pin should be a
may
be restored by peening the holes in
pump
angle
of
90°
the marks scribed
of
the rocker arm, level with the
secure
the
two halves
screws finger-tight. Push the rocker
pump
the
bottom
as described in Section
and
on
the rocker arm working
'010 in. (·25 mm.).
tap
and
body with
and
turn
to
engage the diaphragm
on
Hold
of
body
to
of
its stroke
lev~r.
pump
mounting
fit in the
insert the dia-
its.
locating
Da.
2).
Press the
it anticlockwise
of
the
pump
the
joint
flanges
the diaphragm,
the
pump
position the dia-
and
tighten the
Da.
2.
36
pump
tab
in
body
joint
body,
Section Da.6
DISMANTLING AND REASSEMBLING
MAIN FUEL FILTER
Unscrew the bolt from the centre
and detach the
Remove the filter element, using
to
release the element from the head casting. Withdraw
the three sealing rings from their locations in the head
bottom
ment, in petrol
using a new element
fitted with its strengthened rim uppermost.
plate.
Thoroughly clean all components, excepting the
Reassembly
bottom
and
is
plate from the filter.
allow them
a reversal
of
and
sealing rings.
of
the head casting
a twisting movement
to
dry.
the foregoing procedure,
The
THE
element is
Section Da. 7
DESCRIPTION
The
fuel injectors each comprise two
nozzle
and
the nozzle holder, which
axially by a nozzle nut.
nozzle
and
the nozzle holder are lapped
pressure seal.
The
nozzle is
spaced holes
and
positioned
nozzle valve is accurately lapped
give the closest possible fit within which
freely.
The
retains
the spring is located in
the opening pressure
at
nozzle holder contains a spindle
the
nozzle valve
OF
THE
FUEL INJECTORS
are
The
mating faces
of
the long-stem type, having
an
angle
of
20°
from
the
to
give a spray
of
cone
into
on
its seat.
an
adjustable
the nozzle is 'let.
main
parts,
clamped together
of
both
to
ensure a high
four
equally
nozzle centre line
angle
of
140°.
the
nozzle
body
it
will operate
and
spring which
The
upper
end
cap
nut
by which
and
ele-
the
the
The
to
of
Page 38
FUEL
SYSTEM
Fig. Da.18
FUll
Injector
I.
Cap Dat.
2.
SpriD.
cap
3. SpriD, plate.
4.
SpriDJ.
5.
Joint
6.
Feed-pipe
Lubrication
and
valve
returns this fuel
Section De
REMOVING
Disconnect the injector feed pipe union
injector leak-off unions.
Remove the two set bolts securing the injector
cylinder head
DUt.
washer.
UDioD.
is
by back leakage
a leak-off connection
to
the fuel tank.
•.
8
AND
and
withdraw the injector, using tool
7. Nozzle holder.
S.
SpiDdle.
9.
Nozzle
10. Needle valve.
II.
Nozzle body.
of
on
REPLACING
DUt.
fuel past the nozzle
the nozzle holder
AN
INJECTOR
nut
and
all the
to
18G491 A.
If
the injector is
its inlet union, using sealing
Thoroughly clean the copper sleeve in the cylinder
head. ensuring
face.
Place the injector
tighten the securing bolts, using
set
to
the figure given in
Connect the fuel feed pipe
that
to
all
be stored for
carbon
in
position in the cylinder head
'GENERAL
any
length
cap
18G 216.
is removed from its
torque
and
wrench 18G 537
DATA'.
leak-off unions.
of
time seal
bottom
the
and
Mount
screw the injector cap nut,
washer.
spring
Using spanner 18G 210, remove the nozzle nut and
nozzle, taking care not
nozzle body.
~OTE.-Each
sembly and
Thoroughly clean the injector components, using clean-
ing kit 18G 487 when dealing with the nozzles.
nozzle body
scoring
lery.
the spray holes with
fitted to the probing tool.
the nozzle tip towards the inlet connection. Connect the
adaptor
the nozzle
the internal passages.
be softened in the following manner:
added detergent by dissolving 2 oz. (56 gm.)
soda
of
ies in the liquid, bring it
for
Take
because
per
may be roughened, making it impossible for the injectors
to
them in running water,
watering oil such as Shell Ensis
oil by draining
the injector in dismantling fixture 18G 388, un-
and
remove the copper joint
Cn~crcw
plate, spring,
shOUld
Using the brass wire brush. remO\'e all carbon from the
and scratches, and for blueing due
Clean
out
and
the valve seat, using the brass scrapers,
Assemble the nozzle body into
to
testing machine 18GI09 A,
(See Fig. Da.25) to clear all loose
Where the carbon build-up is particularly
Prepare a
in
I pint ('57 litre)
an ordinary washing detergent. Place the nozzle bod-
a minimum
care
not
jf
the percentage
cent. the surface
be serviced correctly.
Remove the nozzle bodies from the solution. wash
the spring cap nut and remove the
and
spindle.
to
let
the valve
nonle
body
and
always
and
nozzle valve. Examine the valve for
the internal feed passages. the annular gal-
10
per cent. solution
of I hour
to allow the water
be
kept together.
an
appropriate size cleaning wire
adaptor
of
water
to
the boil,
and
not
of
caustic soda rises above
of
the nozzle bore
and
then immerse them in a de-
254.
or
compressed air.
drop
out
valve
are a mated as-
to
overheating.
and
18G
109
and
reverse-flush
carbon
hard
of
caustic soda with
of
and
add
i oz. (14 gm.)
and
allow it
more
than
I!
to
evaporate
Remove the surplus
and
sealing face
too
of
the
clear
E with
from
it may
caustic
to
boil
hours.
much.
an
IS
Section
As
cleanliness is essential when work is being carried
the injectors.
Da
•.
9
DISMANTLING
THE
in the case
of
injection
AND
REASSEMBLING
INJECTORS
pump
dismantling, absolute
out
on
Withdrawing
Fig. Da.19
an
injector. using tool
l8G
491 A
37
Page 39
FUEL
SYSTEM
Fig.
Da.21
Cleaning the
car-
bon from the fuel
galiery
Fig.
Da.23
C I e
ani
n g the
seat
valve
Fig.
Da.20
Clearing the feed
channel bores
Fig.
Da.22
Decarbonizing the
dome cavity
and torque wrench 18G
'GENERAL DATA'.
Reassemble the spindle, spring, and spring plate, and
fit the spring cap
copper joint washer.
Test and set the injector as described
372
set to the figure given in
Do
not overtighten the nozzle nut.
nUL
and the injector cap nut with its
in
Section Da.
10
Section Da 10
TESTING AND ADJUSTING
THE INJECTORS
To
Lest
or
adjust the injectors it
testing machine
Calibration Fluid 'C', which
the operator, should be used
WARNING.-Wben an injector is
boles
ill
the nozzle should always
operator.
Before removing
close the check
prevent damage. which may result from a sudden drop in
pressure.
Checking and adjusting the nozzle opening pressure
Connect the injector to the testing machine, open the
check valve and operate the pump lever. Note the reading on the pfl:ssure gauge at the instant the nozzle sprays.
If
the pressure
adjust the spring cap nut until the correct injection pressure
is
obtained.
Check the tightness
sure that the copper joint washer
Cbecking the nozzle spray
Close the check valve to cut out the pressure gauge and
operate the pump lever
ute. There should be four equal sprays from the nozzle,
evenly distributed, and each spray should persist for
about 6 in.
18G
109
A.
in
an
injector from the testing machine,
valve
to the pressure gauge
is
incorrect
of
the injector cap nut and make
at
the rate
(15
cm.) without any visible core
is
necessary to
and an oil such as Shell
will
not affect the skin of
the machine.
being
tested the spray
be
turned away from the
in
(see
'GENERAL DATA'),
is
in position.
of
60
strokes per min-
use
order to
or
jets
of
Fig.
Da.24
C 1
ear
i n g the
spray holes
The carbon may now be removed, using cleaning kit
18G
487
as already described.
To reassemble the injector, thoroughly wash all the
injector components
the nozzle body and valve in a bowl
fluid and assemble them under the liquid. The valve
should fit easily and without any tightness.
Mount the nozzle holder in fixture
the mating faces
perfectly clean
assembly in position on the nozzle holder. Fit the
nozzle nut and tighten carefully, using spanner 18G 210
in
clean calibration fluid. Immerse
of
clean calibration
18G
388,
of
the nozzle holder
and
undamaged, and place the nozzle
and
nozzle body are
make sure
38
Reverse /lushing an injector
mochine
Shown
18G 109 A and adaptor 18G 109 E.
inset is
II
sectioned adaptor with
In
poation.
nouJe.
.'
rt:~
~
using telfing
1M
no_
~
Page 40
FUEL
After
30
seconds lapping time withdraw the nozzle,
clean the lap, and examine the conical lap tip. There
be a mat surface where the lap has been in contact with
nozzle seat, and
the
mat surface
circumferential ring
cate the extent
The lap should be refaced, as already described, after
every
badly worn nozzle seat it may be necessary
time.
Wip\!
Recharge the tip
nue lapping until the seat
When the scat appears satisfactory after a few seconds
lapping with a freshly ground lap, charge the lap with
fine lapping paste
mat surface
the lapping operation the lap should be cleaned
examincd after every
Thoroughly clean the nozzle by 'reverse-flushing' as
described in
sed air. Make a final inspection
the microscope.
Examine the conical valve face
under the microscope for scoring and pitting. The most
critical
conical face
is
face
defined with
edge' anywhere on its diameter. The reason for this is
ensure a high pressure, fuel
the nozzle valve
valve face should be refaced on the nozzle grinding and
lapping machine.
Ensure
that
the refacing angle is set for the nozzle valve (see
'GENERAL
Mount
the conical tip in the same way as already dcscribed for
the nozzle body lap.
Remove only the absolute minimum
ficient to change the colour
otherwise the needle lift
there should be no sparks
grinding-wheel when carrying out this operation.
The operation
glass, the point
face away from the grinding-wheel.
In the event
nozzle body, due
guide surface
Mount
machine, using a suitable
very small quantity
surface
lapping collet, supplied with the machine, over the rotat-
will probably be narrow
I-fr
minutes
the lap stem clean and recoat it with tallow.
is
produced over the entire seat. Throughout
Section Da. 9 ,
part
of
and
formed. This angle
no
that
DATA').
the valve in the lathe
of
the nozzle valve in the lapping chuck
of
the valve. Start
in
the early stages
in
the middle. These markings indi-
of
the wear on the nozzle seat.
of
lapping time,
of
the lap with lapping paste and conti-
is
free from
and
continue lapping until a smooth
30
seconds
and
the valve face
the parallel stem
'rounding'
and
seat.
the grinding-wheel is dressed correctly
is
best observed through a magnifying-
of
focus being the surface
of
the no:ale valve being a tight fit in the
to
slight distortion
the valve, it is possible
of
is
shoul~
or
wear breaking the 'knife-
proof
If
wear is evident the conical
of
of
will
be affected. As a guide,
or
adaptor
fine lapping paste
the
SYSTEM
will
of
lapping this
or
have a bright
but
in the case
to
scorc:s
and grooves;
of
lapping time.
dry
out
with compres-
of
the nozzle seat under
of
the nozzle valve
the angle formed by the
on
which the conical
be sharp
line-contact between
the machine
of
material; suf-
the valve face
audible hiss from the
of
or
deposits on the
to
restore
chuck,
machine
and
to
and
of
reduce this
and
and
clearly
and
and
reface
is
enough,
the conical
the
of
the
apply a
the
guide
thread
the
to
fit.
ing valve. Oscillate the collet over the valve guide surface
and
after every
the valve
correctly fitting nllve should
body under its own weight when lubricated with fuel oil.
After attention
valve seat face on the nozzle valve, check the nozzle valve
lift (needle lift) against the figure given in
DATA'.
a
by lapping the joint face
lapping plate.
Wben lapping tbe nozzle
takeD to
pressure joint witb the nozzle holder and must therefore
be
9
al"oid
true and
Reassemble the injector as described
and
test and adjust it as described in Section Da.
IO
to
15
seconds
and
test it for correct fit in the nozzle body. A
to
the nozzle body valve seat
If
the needle lift
tilting tbe nozzle, as this face makes a high
at
rigbt angles to the nozzle axis.
is
of
of
lapping time clean
just
slide into the nozzle
excessive it may be restored
the nozzle body on a surface
face, extreme care should
in
or
to
the
'GENERAL
be
Section
Da
10
39
Page 41
FUEL
Fig. Da.26
Reassembling an injector,
and spanner 18G
unatomized fuel.
or
leaks
test to locate the cause.
Checking the pressure tightness of seatings
the pump lever slowly until a pressure
pheres is obtained. Hold this pressure for
then check the nozzle tip for
is permissible.
pressure for
paper below the nozzle tip. The diameter
on
Checking the back-leakage
atmospheres
the pressure to
a new nozzle the time taken should
A nozzle which has been in service will show a faster
pressure drop but as this does not seriously affect engine
performance a nozzle may be considered serviceable until
a time factor
dribble occur wipe the nozzle dry and repeat the
Open the check valve, wipe the nozzle dry, and depress
60
the paper should
Depress the pump lever slowly until a pressure
210 with torque wrench 18G 372
If
the spray
If
in doubt, maintain the
seconds while holding a piece
not
is'
obtained, then check the time taken for
drop
from
of
less than 5 seconds
using fixture 18G 388
dryness-slight
exceed
150
to
SYSTEM
is
not correct,
tin.
(13
100
atmospheres.
be
12
is
recorded.
or
of
160
10
seconds and
dampness
160
atmospheres
of
of
the wet spot
mm.).
to
30
if any
atmos-
blotting-
of
160
For
seconds.
Select a suitable lap from those supplied with the grind-
ing and lapping machine. The bore diameter varies
is
slightly from one nozzle to another, and it
fits
choose a lap which
ner as the
the valve seat
ping.
Mount the lap
lapping machine
nozzle body
The lap should
across the surface l)f the grinding-wheel, feeding-in the
lap very
cleaned up. Inspect the lap under the nozzle microscope
to ensure that its ground surface
appears rough the grinding-wheel should be dressed.
Fit the lap into the lapping chuck
apply a coating
for lubrication purposes. Apply a very small quantity
lapping paste to the tip
paste does not extend to the top
NOTE.-If
the guide surfaces
clearance between the nozzle body and valve
increased and the nozzle
seniceable.
Start the machine and carefully slide the nozzle over
the rotating lap. Oscillate the nozzle on the lap,
short strokes,
engaging the nozzle seat with the lap
stroke. The
nozzle seat for more than
pressure applied to the nozzle should be light. Excessive
pressure will cause grooving
nOlLle
in
SC;Jt
be
gradually until its conical surface
any lapping paste is allowed to get between
at
lap should not remain in contact with the
the nozzle body
valve. This
the body with the body bore after lap-
in
the lathe
and grind the conical tip to the correct
angle as given
passed slowly backwards and forwards
of
tallow to the guide surface
of
a rate
will
ensure concentricity
of
th.!
nozzle grinding and
in
'GENERAL DATA'.
is
smooth.
of
the lap, taking care that the
of
the cone.
the lap and the nozzle body, the
will
probably
of
20
to
30
five
seconds
of
the nozzle seat.
necessary to
in
the same man-
of
is
entirely
If
the surface
of
the machine and
of
the lap
of
will
be
be
made
UD-
in
very
strokes per minute.
at
the end
at
a time and the
of
each
!
Section Da
RECLAIMING
If
after dismantling, cleaning and testing, as described
in
Sections Da. 9 and Da.
be unsatisfactory,
nozzle providing it has been found satisfactory when
'Checking the back-leakage'.
To recondition a nozzle the use
lapping machine is required. A nozzle microscope is also
necessary for inspection
during the reclaiming process.
Remove the sump.
Unscrew the two set bolts securing the oil delivery
pipe to the cylinder block.
Remove the nuts securing the oil pump to the front
main bearing cap and withdraw the pump. complete
with delivery pipe. oil strainer. and pressure relief valve.
noting the shims between the bearing cap and oil pump.
To
replace the oil pump. reverse the above procedure
and
fit
a new gasket to the delivery pipe flange. Tighten
the oil pump securing nuts to the figure
'GENERAL DATA' using torque wrench
Check that the backlash on the oil pump drive gears
is as
given in 'GENERAL DATA' and. if necessary.
adjust the backlash by means of the shims between the
oil pump and main bearing cap.
The oil strainer can
Checking the oil pump rotor end-float
be
removed with the oil pump
Fig. Aa.5
mE
18G
given
372.
in
B
Fig.
Aa.6
Check the oil pump rotor lobe clearance with the
rotors ill positions A alld
are
for
the maximum clew·ance
still
in
situ
hy
ullscrcwlIlg
the oil
~uction
pipe
flange
B.
The dimensions given
tht:
two
set
holts
to
the
oil pump.
whidl
secure
Section Aa.7
DISMANTLING AND REASSEMBLING
TBE
OIL
PUMP
Disconnect the delivery pipe. oil strainer, and pressure
relief valve from the oil pump.
Remove the gear and key from the end of the pump
shaft.
Unscrew the set bolts, separate the oil pump cover
from the
with inner and outer rotors.
Thoroughly clean and inspect
ponents.
Check the rotor end-float and driving shaft
ance against the figures given in 'GENERAL DATA',
Excessive rotor end-float can be remedied
the pump body face.
Measure the rotor lobe clearance
Fig. Aa.6.
Reassemble the oil pump
procedure, noting that the chamfered end of the outer
rotor should be fitted towards the bottom of the rotor
pocket. During reassembly smear all working parts
with new engine oil.
body, and remove the pump shaft complete
aU
the dismantled com-
clear-
by
lapping
as
illustrated
by
reversing the dismantling
in
Page 58
DIESEL ENGINE
Adjustillg the valve 10 rocker clearance
Section As.8
OIL
The
pressure
on
the
outlet
towards
move
washer,
plunger
check
tion
versal
renewthe
the
the
Release
the
oil
and
Examine
for
the
in
"GENERAL
When
of
mounting
Fig.
Aa.7
PRESSURE
RELIEF
relief
flange
front
the
of
the
of
the
locking
pressure
valve
wear
spring
the
seat
valve
or
against
DATA."
reassembling,
the
dismantling
body
plug
locking
flange
gasket.
valve
oil
engine.
washer
relief
from
score
..
,-0
-p
VALVE
is
pump,
pI
ug,
cover.
seat
marks,
the
specifica-
which
procedure,
washer,
A4588A
mounted
facing
and
re-
locking
and
the
and
is a re-
and
bracket set bolts.
'GENERAL
bolts.
Adjust the valve rocker clearance (Section
and replace valve rocker cover.
Start the engine and inspect the rocker cover joint
for oil leaks.
then reset the torque wrench (see
DATA') and tighten the i in. diameter
Aa.H)
Section Aa.lO
DISMANTLING AND REASSEMBLING
THE
ROCKER
Unscrew the set bolts from the centre rocker
bracket and separate the rocker shafts from the
centre bracket.
Remove the rockers and distance collars and the
remaining brackets from the rocker shafts. and unscrew
the blanking plug from the end of each shaft.
Release the tab washer from the oil relief valve
pipe on the front intermediate bracket and unscrew
the relief valve from the bracket.
Remove the plug from the relief valve body and with- .
draw the spring. spring seat. and relief valve ball.
Clean all the dismantled components. paying
tar attention to the oilways.
Inspect the components and check them against their
specifications in
When reassembling. which
mantling procedure. smear all moving parts with new
engine oil. renew the tab washer and copper gaskets
on the oil pressure relief valve. and
so that it
ensure
rectly
that
pOSitioned
'GENERAL
is
directed down the push-rod tunnel. Also
the rocker shaft distance collars are cor-
(see
SHAFT
DATA'.
is
a reversal
'GENERAL
ASSEMBLY
of
fit
the drain pipe
DATA,).
drain
particu-
the dis-
Unscrew
center
rocker
rocker
shafts
the
set
bracket
from
the
bolts
and
center
from
separate
bracket.
the
the
Section As.9
REMOVING AND REPLACING
THE
ROCKER
Remove the valve rocker cover.
Slacken the rocker adjusting screws until all pressure
is relieved from the valve springs.
Remove the set bolts
the cylinder head and lift
Refit the rocker shaft assembly to the cylinder head
with all rocker adjusting screws fully slackened. Using
torque wrench 18G 537 set to the figure given in
'GENERAL
DATA'
SHAFT
securing the rocker brackets to
off the rocker shaft assembly.
tighten the
ASSEMBLY
/r
in. diameter rocker
Section
The clearance between tile ends of the valve stems
and the valve rockers
gauge.
Crank the
check the clearance
fully closed.
To
a screwdriver and slacken the locknut (Fig. Aa.7).
Rotate the adjusting screw until the clearance between
the valve stem and rocker is
DATA'.
it
in position with the locknut. and then re-check the
clearance.
Check the remaining rocker clearances
As.ll
VALVE
adjust the clearance. hold the adjusting screw with
Hold the adjusting screw against rotation. lock
ROCKER
is
FOUR-230
engin~
until No. g valve
of
No. 1 valve. which will now be
CLEARANCE
checked by means
is
fully open and
as given in
by
of
a feeler
'GENERAL
reference.
55
Page 59
DIESEL ENGINE
to the following table:
No.1
valve (ex.)
3
"
5
"
2
..
8
"
6
"
4
..
7
"
valve
The
periodically
"
"
"
"
"
"
"
(in.)
(ex.)
(in.)
(ex.)
(in.)
(ex.)
(in.)
rocker
at
the
with
No.8
..
"
"
..
" "
"
"
clearance
intervals
valve
6
"
4
"
"
7
"
"
I
"
"
3
"
5
"
"
2
"
"
recommended •
fully open.
"
"
"
"
"
"
..
"
"
"
"
"
"
should be
SIX-346
Crank the engine until No.
check' the clearance
fully closed.
To
adjust the clearance. hold the adjusting screw with
a screwdriver
Rotate the adjustina screw until the clearance
tho valve stem and rocker
DATA'. Hold the adjusting
it in position with the locknut. and then
clearance.
Check
to the following table:
Check
the remaining rocker clearances by
and
adjust No.
..
..
..
..
"
,.
The
valve
be
checked
recommended.
Section
stat
thermostat
bracket
h.12
REMOVING AND REPLACING
Drain
Remove
housing.
Remove
from
of
and slacken the locknut (Fig. Aa.7).
I valve (ex.) with No.
7
..
9
..
2
..
5
..
10
..
12
..
6
..
4
..
II
..
8
"
3
"
rocker
periodically
THE
CYLINDER
cooling
hoses
the
housing
cylinder
12
valve is fully
No. 1 valve. which
is
u Jiven in 'GENERAL
screw
against rotation. lock
(in.)
..
..
..
..
..
..
..
..
..
..
..
system.
..
(ex.)
..
(in.)
.. ..
(ex.)
.. ..
(in.)
.. ..
(ex.)
..
(in.)
..
(ex.)
..
(in.)
..
(ex.)
..
(in.)
..
..
clearance
at
the
BEAD
connected
four
bolts
and
heads.
engine
wiD
re-check
12
valve fully open
6
4
11
8
3
I
7
9
2
5
10
intervals
to
checked
opeD
and
now
be
betweeD
the
referenm
..
..
..
..
..
"
should
.thermosecuring
lifting
Remove
water
exchanger
cooler.
hose
dual
bracket
engine.
pansion
manifold
lift
rocker
entrance
wiring
leak
off
the
intake
Remove
cylinder
NOTE:
in
nozzle
face
tain
Fig.
Aa.8(B)
cylinder
only,
amount
Remove
off
be used as a wedge between the cylinder head and block.
A suitable method of removing the cylinder head is
to place a sling round the exhaust manifold studs on
one side, and round two high-tensile ,i-in.
bolts screwed into the air inlet manifold bolt holes
the other side. When lifting the head a direct pull
should
cylinder head gaskeL
pump
Remove
Disconnect
from
Remove
oil
Disconnect
tank/
Remove
away
Release
feed
Remove
bracket
Disconnect
off
all
pipes
entry
Remove
manifold
intake
Remove
The
position
tips
of
the
damage
Working
Aa.8
then
in
the
the
cylinder
On no account should a screwdriver
be
given to lift it evenly
Unscrew the two locating dowels and remove the
water
and
water
and
side
the
cooler
and
exhaust
the
from
with
the
pipe.
of
dirt.
the
unions
of
dirt.
the
head.
injectors
in
protrude
head
.
(A)
for
the
head
unscrew
the
cylinder
hose
heat
exchanger,
hose
the
dual
the
two
move
exhaust
expansion
the
heat
two
to
the
at
and
six
manifold.
the
the
in
for
six-346,
nut a quarter
same
head.
water
of
heat
bolts
to
the
cooler
manifold.
_cylinder
exchanger
"T"
connection
Seal
bolts
the
fuel
fuel
injectors
bolts
to
cylinders
injectors
should
cylinder
below
and
are
the
order
the
each
order
head
pipe
ends
cylinder
pipe
injectors.
up
between
between
oil
cooler,
exchanger.
securing
engine
away
tank/
securing
unions
to
securing
head
the
liable
four-230,
slacken
nut a further
until
nuts
-
or
the studs.
fresh
at
pump.
heat
discharge
lifting
from
from
head,
attached.
to
from
not
shown
of a turn
ex-
exhaust
and
in
prevent
head.
Seal
prevent
head.
be
left
as
bottom
to
sus-
each
loose.
and
similar tool
UNF. set
the
the
the
and
the
the
the
lift
at
in
or
on
56
Page 60
Check the cylinder head joint face for flatness.
a straight-edge.
If
there is any doubt as to the condition of the
it
cylinder head gasket.
one fitted. plain side downwards.
Replace the remaining components by reversing the
removal procedure.
tightened in the order shown in Fig.
Adjust the valve rocker clearance as described in
Section
speed
retighten the
Fig.
Aa.ll.
Bleed the fuel system
Start the engine and allow
until
it
is thoroughly
Stop the engine. remove the valve rocker cover. and
cylinder head nuts in the order shown in
Aa.S.
should be discarded and a new
The cylinder head
of
air
it
to run
DUts
Aa.S.
at
a fast idling
should be
warm.
uSlng
Recheck
described
Fig.
Cylinder
the
valve
in
Section
Aa.8A
head
tightening
rocker
Aa.
clearance
11.
(FOUR-230)
nut
slackening
sequence
and
as
Using spanner 18G
to tighten the cylinder head nuts
Fig. Aa.9
396
and torque wrench
18G
372
Fig.
Cylinder
tightening
Aa.
head
8B
(SIX-346)
nut
slackening
sequence
and
57
Page 61
DIESEL ENGINE
Fig.
Aa.JO
Compressing the valve springs. using
Recheck the valve rocker clearance as described in
Section
Aa.ll.
tool18G
Section Aa.13
REMOVING
Remove the valve rocker shaft assembly (Section
Aa.9).
Drain the cooling system
Remove the cylinder head (Section Aa.l2).
Detach the spring clips from the valve spring collar
retainers. Compress each set of valve springs. using
tool18G
retainer. Release the compressing tool and remove
the valve spring collar. oil seal. and retainer (exhaust
valve only), valve springs. and the exhaust valve.
draw the thimble from the inlet valve stem. detach the
valve key from its slot in the inlet guide and remove
the inlet valve. Remove the inlet valve oil seal from
inside the thimble.
Clean the valves and guides.
removed from the guides by dipping the valve stem
in petrol
the guide until it
the valve guides should be renewed (Section Aa.15).
Inspect the valve faces and seats. and recondition
them as necessary (Section Aa.l4).
Check the valve springs against the specification in
'GENERAL
springs are square with
A new oil seal should be fitted to each valve during
reassembly to avoid the loss of oil tightness which will
result from re-fitting the old seals.
that the seals are more easily fitted if they are soaked
in engine oil before use.
lubricate
oil and replace the valves. which are numbered,
106
AND
REPLACING
and remove both halves of the spring collar
or
paraffin and moving it up and down in
is
free.
If
excessive wear
DA TAt and ensure that the ends of the
thp.
spring axis.
the valve stems and guides with new engine
THE
The
carbon can be
It
will be found
106
VALVES
With-
is
disclosed
in
their
I
~
I A
I'll
,
,I
Fig. Aa.11
Engine
(A)
original positions
inlet valves
top of the valve stem
locating peg. Insert the valve key into position in the
inlet guide slot and replace the thimble complete with
oil seal. Fit the inner and outer valve springs, the
exhaust valve oil seal (chamfer downwards) and
retainer. and the valve spring collar. Compress the
valve springs with tool
collar retainers. Release the compressing tool and
replace the spring clips on the collar retainers.
Check that the valve head 'stand-down' below the
cylinder head face
'GENERAL
is
excessive,
'stand-down' being excessive with new valves.
valves
Fit the valves with their top faces standing down
below the cylinder head joint
valve components showing the locating
on the inlet valve and the chamfered bore
of
the exhaust valve oil seal
(B)
in
the cylinder head. Position the
80
that the small flat (Fig.
is
in line with the valve guide
18G
106, and refit the spring
is
in accordance with the figures in
DATA.'
fit
seat inserts as described in Section Aa.l6.
If
the valve head 'stand-down'
new valves. and in the event of the
Fig. Aa.12
face
shown inset
Aa.ll)
to the dimension
fiat
on the
fit
new
58
Page 62
DIESEL ENGINE
Fig.
Aa.13
Grinding·in a valve, using tool18G
29
Section As.14
V
ALVE-GRINDING
If
only slightlY pitted the valve faces and
be reconditioned by grinding-in with tine grmdmg
compound. Smear the valve face
compound and lap the valve on to Its
semi-rotary motion, with tool 18G 29.
is
not
complete until a dull, even,
blemish is produced on both the valve face and seat.
After cleaning away all traces
can
the valve seating
marking blue to the valve face
about
one
tum
completely reproduced on
lapping, using oil only, is recommended.
When the valve faces and seats cannot be corrected
by lapping the valves should be refaced to the .correct
be checked
on
its seat; the marking should be
ligh~ly
mat
surface, free from
of
grinding compound
by
applying a spot of
and
rotating the valve
the
valve seat. A tinal
sea~s
~aD
with
gri~ding
s~at,
usm~
ThIs operatlon
angle (see
machine. and the valve seats recut, using tools 18G 27.
18G 28. 18G
18G 174 A. 18G
the glaze-breaker to prepare the seat surface and recut
the seats, removing only as little metal as is necessary
to ensure a true seat. Restore the seats to their correct
width (see
cutters. Finally.
already described.
'GENERAL
28
A. 18G
174
'GENERAL
lap.
DATA')
28
B.
~8G
DATA')
the valves onto their seats as
on a valve grinding
B. 18G
174
28
C. and
by using the narrowing
Section As.IS
REMOVING
THE
Remove the valve rocker shaft assembly (Section
Aa.9). Drain the cooling system; Remove
the cylinder head (Section Aa.12) and the valves
(Section Aa.13).
Drive the valve guides out
using tool 18G
port
end_
New valve guides should be driven into position with
tool 18G 228 until the shoulder on the guide is flush
a
against the cylinder head. When titting the inlet valve
guides ensure that the locating peg slot in the valve
guide shoulder is in line with the locating peg in the
cylinder head before driving the guide into position.
Finish ream new valve guides, using tool 18G 229A,
then ensure
the valve guide bores. recutting the seatings if necessary
(Section Aa.14).
Replace the remaining components by reversing the
228
that
AND
REPLACING
VALVE
inserted into the guide from the
the valve seatings are concentric with
GUIDES
of
the cylinder head.
C. 18G 174.
180230.
Use
Badly pitted
tools
18G
valve
27, 18G 28,
l8G 174, l8G 174 A,
Fig.
Aa.14
seats should
18G
28
A,
l8G 28 B.
18G
174 B, l8G 174 C, and
be
re/aced, using
18G
28 C,
18G
230
Fig.
Aa.1S
Driving a valve guide into position, using tool
18G 228
59
Page 63
DIESEL ENGINE
=.-.
-.
-: -...
=-:-.""..:::.:=--.":.-
-----.
==
removal procedure, and adjust the valve rocker
clearance (Section Aa.11).
':-
..
"":
..
:---=-:..
..
:;:=
Fig.
Aa.16
Reaming a valve guide using tool
l8G
229A
Cutting
18G
213
tool
18G
inserted
Fig.
AaJ8
a·
thread in
A.
to enable the sleeve to be withdrawn
213.
an
injector sleeve. using tool
by
Shown inset is the 'Alkathene' plug
ill the sleeve to prevent swart entering the
cylinder
bore
Section Aa.16
VALVE SEAT INSERTS
If
a valve seating cannot
cutting and refacing tools, or if valve head stand-down
is
excessive with a new valve, a valve seat insert should
be fitted.
To
fit
an insert. machine the seating in the cylinder
head
to
the dimensions given
Valve seat machining dimensions
Inlet
(A)
C. Nominal diameter 1·450 in.
(36,8 rnm.). (32-75 rnm.).
D.
1·775
to
to
E.
Maximum radius ·015 in. N Maximum radius ·015 in.
(·38 rnm.). (·38 mm.).
F.
·325
8·33 mm.). 8'33 rnm.).
G. '135 to '140 in. (3,43 to
3-56 rnm.). 3'56 rnm.).
H.
·070 to ·080 in. (1·78
2·03 rnm.). 2·03 rnm.).
J.
45·
L Chamfer ·020
('508 to '762 rnm.).
1·776 in. (45'076 M. 1·625 to 1-626 in. (41'27 to
45·102
mm.).
to ·328 in. (8·25 to
to
·030 in T. Chamfer '020
at
be
restored with the normal
in
Fig. Aa.l7. and press
Fig. Aa.17
Exhaust
L.
Nominal diameter 1·290 in.
41·30 mm.).
P.
·325
to
Q.
·135 to ·140 in. (3,43 to
to
R. ·070 to ·080 in. (1·78 to
s.
45·.
45·. ('508 to ·762 rnm.)
(8)
·328 in. (8,25 to
to
'030 in.
at
4S·.
the insert. which has an interference
('051
to
'102 mm.), into the cylinder head. Finally,
grind or machine the new seat
in Fig.
Aa.l7, ensuring that the throat of the new
fit
of
·002
to
·004
to
the dimensions given
in.
seat
blends into the throat in the cylinder head.
Check the area of contact between the new seat and
its valve with marking blue, and if necessary lap the
valve onto its seat (Section Aa.14).
Section Aa.17
DECARBONIZING
Remove the valve rocker shaft assembly (Section
Aa.9).
Drain the cooling system.
th~
Remove
valves (Section Aa.13).
Plug the waterways in the cylinder head and the
cylinder block with clean rag.
If
special equipment for decarbonizing is not available
it will be necessary
the piston crown and cylinder head by scraping. A
length of copper tubing with the end flattened and
up makes an ideal scraper which will not scratch.
The ridge of carbon
should not be disturbed and a ring of carbon should
also be left round the periphery of each piston crown.
An old piston ring sprung into the bore and resting on
the top of the piston will facilitate this operation.
Remove the carbon deposit from the valves, valve
ports, valve guides, and cylinder head. Thoroughly
clean the cylinder head and ensure that all traces of
cylinder head (Section Aa.12) and the
to
remove the carbon deposit from
filed
in
the top of each cylinder bore
60
Page 64
DIESEL ENGINE
J-Ig.Aa.l9
• Withdralt'ing
carbon dust are removed from the head and cylinder
bores.
Replace the components. reversing the removal
procedure. and adjust the valve rocker clearance
(Section As. I I).
an
injector sleeve. using too/18G 213
D.
Section Aa.18
REMOVING AND REPLACING
THE
INJEcroR
If
it is found necessary to renew an injector sleeve
the operation can
cylinder head.
Remove the injector.
.Insert
18G 213 A, into the injector sleeve
entering the cylinder. Using tool 18G 213 A. cut a
thread on the inside
but leave the plug in position. Screw tool 18G 213 0
into the injector sleeve
Aa.19)
Remove the 'Alkathene' plug from the injector sleeve.
Crank the engine to position the piston. in the cylinder
being operated on.
Coat
part
the cylinder head
ISG 561.
an 'Alkathene' plug, supplied with tool
.•
the new injector sleeve with sealing compound
number
be
carried
of
at
B.D.C.
AKF
1702 on those surfaces which contact
and
drive it into position using tool
SLEEVF.S
out
without removing the
to
prevent swarf
the sleeve. Remove the tool
and
withdraw the sleeve (Fig.
..
--.-.~
_._-
--=:';''':":
~~:'
---==:';-~'-="
--
..
"::'.:
.-".
..
~~':~:~~
-.-=
Fig. Aa.20
Installing an injector sleeve. using tool 18G
Drain
the
cooling system.
Remove the cylinder
If
No. 1 connecting rod is to
oil strainer and suction pipe from the oil pump.
Remove the
bearing.
Clean the carbon deposit from the top of the cylinder
bore and withdraw the cunnecting rod and piston
upwards
cap
through the cylinder.
NOTE.-Each
with
the
Dumber
removed
engine oil. space the compression ring gaps equally
round the circumference of the piston. and compress
the rings, using too118G
through the cylinder bore. so positioned
connecting rod cap will
(Fig.
ALll).
Lubricate the cylinder bore and piston with clean
Insert the connecting rod and piston downwards
head.
and
the
collDeCtiDa
of
the
cyliader from which
55
be
towards
be
bottom
rod
A.
removed detach the
half
of
aad
cap
the
left-hand side
561
the big-end
Is
stamped
it
w.
that
the
.
-
of
Section Aa.19
REMOVING AND REPLACING
A CONNECTING ROD AND PISTON
Drain
Remove the valve rocker shaft assembly (Section
AL9).
and
remove the
sump.
~.
-
...
,,,
...
,,
.....
.
~
-:F
Fig. Aa.21
Installing a piston and connecting rod assembly
using
tool18G
55 A
61
Page 65
DIESEL ENGINE
1.
Connecting rod.
2.
Cap.
3.
Bearing.
4.
Bolts.
S.
Tab washer.
6.
Hollow dowel.
7.
Little-end bush.
5--"""~~~
Fig. Aa.22
The arrows
and grooves. The arrows
number from which the connecting rod was
the engine. The cavity in the piston crown should now
be offset towards the right-hand side
Ensure that the connecting rod and cap. the bearing.
and the crankpin are absolutely clean.
halves of the bearing
Each half bearing has a tag which locates in a groove
in
the connecting rod and cap (Fig. Aa.22).
bearing is being used the two halves should be replaced
in
their original positions. Lubricate the bearing and
crank pin with clean engine oil. position the hollow
dowels between the connecting rod and cap, and
cap into
cap adjacent to each other. Fit new tab washers under
the big-end bolts
in
'GENERAL
Lock the bolts
Replace the remaining components, reversing the
removal procedure, and adjust the valve rocker
clearance (Section
(A)
positiQ.TI
DATA,' using torque wrench 18G 372.
in
indicate the bearing locating tags
(8)
indicate the cylinder
removed
to
the connecting rod and cap.
with the stamped numbers on rod and
and
tighten the bolts to the figure given
position with the tab washers.
Aa.ll).
......::I~~II
of
the engine.
Fit
If
the two
the old
fit
the
Fig. Aa.23
When checking the gap clearance
ring
enmre
Section
DISMANn..ING
Remove the bearing halves from the connecting rod
and cap.
marked to ensure reassembly
Using tool 18G
the piston and press the gudgeon pin out. Mark the
piston and gudgeon pin to ensure correct reassembly.
Remove the rings from the piston and place them
the order
reassembling them in their original grooves.
Thoroughly clean all the dismantled components and
inspect them for damage.
Check the cylinder bore for scoring and for wear
'GENERAL
worn in any place
NOTE:
and
grooves.
wrist
the
VD
scraper
For
are
present
ring
ring
starved
that the ring is inserted illto an unworn
part
of
the cylinder bore
Aa.20
AND REASSEMBLING
A CONNECTING
If
the bearing is to be re4lSed it should be
1004. withdraw the two circlips from
in
which they are removed. to assist in
DATA').
by
On
the
six
cylinder
one
pin.
for
series
rings
the
98
series
but
may
is
be
installed.
for
lubrication.
ROD
If
the diameter
·010 in. (·254 mm.) or more. a new
VD
series
engi!les
above
two
scraper
engines.
are
used.
engines
only
installed.
the
of
a new piston
AND PISTON
in
its original position.
of
the bore is
of
the
and
there
one
are
below
rings.
the
both
upper
piston
both
If
of
grooves
scraper
a
will
in
(see
four
two
the
For
these
lower
be
62
Page 66
DIESEL
ENGINE
Fig. Aa.25
Removing
liner and piston should be fitted (Section Aa.21). In the
event
liner. the cylinder liner sealing ring should be renewed
(Section Aa.21
Check the piston
and replacing a connecting rod little-end
of
a water leak
).
bush using
tool18G
at
the
to
cylinder bore clearance (see
616
bottom
of
the cylinder
'GENERAL DATA').
Insert each piston ring into the cylinder bore
measure the piston ring
figure in
placed in an unworn
used to position the ring square to the cylinder bore axis.
Check
(Fig. Aa.24) against the figure in
The
clearance the ring should be fitted to the piston and
inserted into
into the liner until
ring width has entered the liner. then check the ring
groove clearance.
If
cylinder. the glaze should be removed from the cylinder
bore.
Check the fit
'GENERAL DATA.'
the clearance
top
ring is taper-sided.
an
unworn cylinder liner. Push the piston
it is decided to fit new piston rings in a used
of
gap
(Fig. Aa.23) against the
The
ring should be
part
of
the bore
of
each ring in its own groove
and
'GENERAL DATA.'
and
to
check
about
three-quarters
the gudgeon pin in the piston (see
of
and
the piston
its groove
the piston
'GENERAL DATA').
Measure the gudgeon pin to small-end bush clearance
'GENERAL DATA').
(see
bush (Fig. Aa.2S). using tool 18G
in
a new bush. line
hole in the
Check the connecting rod alignment against the figure
in
'GENERAL
Fit
piston. ensuring
which are taper-faced. are installed with
'TOP'
top
the rings into their respective grooves in the
uppermost.
up
of
the
DATA.'
that
and.
if necessary. renew the
the oil hole in
connecting rod.
Nos. 2
and
616.
Before pressing
the
bush with the
3 compression rings.
the
side
marked
Reassemble the remaining components. reversing the
in
dismantling procedure. noting that the cavity
piston crown should
the opposite side to the big-end cap.
be offset to the connecting rod on
the
Section Aa.21
REMOVING AND REPLACING
A CYLINDER
Drain
and
remove
Remove the valve rocker shaft assembly (Section
Aa.9).
Drain
the
cooling system
Remove
Withdraw the connecting rods
Aa.19).
Using tool
upwaros from the cylinder block (Fig. Aa.26).
Remove the cylinder
in
the bottom of the cylinder block.
the
NOTE.-1be
OCCllliODS
Inspect the cylinder liner seating in the top of the
cylinder block for signs
accumulation. Thoroughly clean the seating. being
careful
is liable to occur.
the locating flange
same care as for the liner seating.
Thoroughly clean the sealing ring groove in the
cylinder block.
Insert the cylinder liner into the cylinder block
without fitting the sealing ring. and
the fuIly-home
of
qUader
not
to remove any metal. otherwise a water leak
the
cylinder
ISG 227 C. withdraw the cylinder liner
liner sealing ring from its groove
aeaIiag
position,
riDg should
liDer removaL
If
the old liner is to be refitted. clean
at
the top
Fig.
Withdrawing a cylinder liner. using
LINER
sump
head
(Section Aa.12).
of
burrs. carbon.
of
the liner exercising the
Aa.26
and
pistons (Section
be
raaewed
clamp
tool18G
OD
aD
or
rust
the liner in
227 C
63
Page 67
DIESEL ENGINE
Fig.
Aa.27
(A)
Insert shims at
to adiust the standing height
the early cylinder liner. Shown inset are the faces
of
the cylinder block and the liner from which the
standing
Check the standing height of the cylinder liner against
the dimension in
the liner is stepped
measured between the
top
face
of
the
ing height
shims (see
cylinder liner flange.
Remove the liner, install a new sealing ring in the
groove
a coating of
reduced
the liner, using a semi-rotary motion
sealing ring becoming twisted
liner fully home then
area
·00175 in. ('04 mm.), withdraw the liner
of
early liners
'GENERAL DATA' for thickness)
in the
adjacent
bottom
Hylomar
diameter
to
heir:ht is measured
'GENERAL DATA.'
and
the standing height should be
lower face of the step
cylinder block.
of
SQ32 jointing
at
the lower
check its bore for ovality in the
the sealing ring.
If
can
be increased by fitting
the cylinder block, and apply
end
or
The
necessary, the stand-
compound
of the liner. Install
to
dislodged. Press the
If
the ovality exceeds
and
top
face
and
under
prevent the
check that
of
of
the
the
to the
the sealing ring
to
exchange the sealing ring to reduce the liner ovality
to an acceptable
Replace the remaining components, reversing the
removal procedure,
(Section
Aa.ll).
is
seating correctly. It may be necessary
limi,:.
and
adjust
the valve rocker clearance
Section Aa.22
REMOVING AND R£PLACING
THE
TIMING GEAR CASE COVER
T~ke
the w,;ight of the engwe at the
with a sling,
Release
mountings
Unlock
crankshaft, using
Withdraw the crankshaft pulley, using tool 18G 231
adaptor
and
the end
be removed
Remove the engine front
timing gear case.
Unscrew the remaining bolts securing the timing
case cover
engine front lifting bracket and the
support
Remove the set bolts securing the front
to the timing case
bolts two complete turns.
Pull the timing case cover, complete with
oil seal and distance piece, off the two locating dowels
at
the lower end
not to damage the
Cover the open end
but
do
not
lift directly
~the
engine front
and unscrew the nut from the front of the
spanner
18G
231
A, and extract the pulley key from
of
the crankshaft.
and
replaced, using tool 18G 1111.
to
the timing
bracket.
cover
of
the timing
sump
of
support
18G 97.
The
support
gear
and
slacken the remaining
gasket.
the
sump
!iont,
prefelibly
under
the sump.
bracket from its
crankshaft oil seal
bracket from the
case.
and
detach the
alternator
of
the
crankshaft
gear
case, taking care
to
prevent the ingress
may
gear
sump
sump
('.-.--.."
,.'
"/>
!i!)~_/
'/'"
,.
"<'.'j'
, '
I
...
j j
,
t,lxi
~'
"I/I(
~/
;','/
.I
~
.,
Fig. Aa.28
Removing the starting handle jaw
18G 97
64
nut, using tool
~~
..
:.:--.
~---
Fig. Aa.29
Withdrawing the crankshaft pulley, using tools
231
18G
and 18G 231 A
Page 68
DIESEL ENGINE
Fig.
Aa.30
Withdrawing
18G
of foreign matter.
Clean the joint
and examine them for burrs. Inspect the crankshaft
oil seal and renew it. if necessary. Ensure that the
crankshaft
scratches where it contacts the crankshaft oil seal.
When replacing the components. which is a reversal
of the foregoing
gasket but
between the sealing lips of the crankshaft oil seal should
be filled with high melting point grease before assembly.
the camshaft
231.18G
distance piece
do
not use jointing compound.
231
faces of both timing case and cover.
procedure.
gear.
using tools
C.
and 18G 231 D
is
free from burrs and
fit
a new gear case cover
The
groove
Section Aa.23
REMOVING
THE
Before removing the timing gears check the gear
backlash against the figure in
Refit the crankshaft nut and rota'te the crankshaft.
using spanner
at
T.D.C. with
stroke. This will correctly position the timing marks
on the crankshaft and camshaft gears for reassembly.
kl:lI
(
using spanner
at
T.D.C. with
stroke. This
on the crankshaft and camshaft gears for reassembiy,
Press back the jocking washers and umcrew the
from the camshaft and the injection pump dnve shaft.
Remove the thrust washer and withdraw the
from its shaft.
NOTE.-After
......
.....
pletely slackeaed oil
fully dOled.
may
foal
Remove the oil thrower from the end of the
crankshaft.
Withdraw the oil pump driving gear and crankshaft
gear. using tool
Using tool 18G
the gears from the camshaft and the injection pump
Li1<:
.;rallkshai L
the
c:raaksbaft
all the
the
18G
No.4
18G
No.'l?
will
"alft
If
this conditioD is
pistODS
18G
AND
REPLACING
TIMING
GEARS
'GENERAL
DATA.'
Four-230
97. until Nos. 1 and 4 pistons are
piston commencing its induction
Six-346
oj!.
L
.......
• C la
lC
'tile cr an""snall.
97. until Nos. 1 and
'piston commencing its induction
corr<:ctly position the timing marks
the idler gear bas
or
camshaft should
rocker
231
231
adjasdDg
to
allow all the "alvea to remain
Dot
&Dd
cause
serious
and adaptor
and adaptor
,6
pistons are
beea
be
serews are com-
obse"ed
d8JlUlle.
18G
231
18G
231
C. withdraw
n1.its
idl<:r
!l.ear
remon~d
rotated
the "alvet
B.
.
Fig.
Aa.3J
Timing
the
(A)
drive
gears
'0'
gears
showing
marks on the
and
hubs.
and
(B) the timing nuuks on
the idler
and
drive
gears
o
®
o
0-"
o
o
, :
\ ',\ (
\\\_-~
\
~~-~
'
\\
\
___
'~I
;°1
10
I
J
. I
65
Page 69
DIESEL ENGINE
:::,'::~-.
i,i:;::::
~
Fig
RelllOl'illg, replacing, and broaching to size the timing idler gear bush, using tool 18G 683
drive shaft. Thrust pads 18G
should be used for the camshaft gear and injection
pump drive gear respectively.
Thoroughly clean and inspect all the dismantled
components.
Check the
idler gear bush to shaft clearance against the figures
given
bush. as described in
Refit the gears to the camshaft. crankshaft. and
injection pump drive shaft and ensure that the timing
marks on the teeth of these gears are in the position
shown
and
engage the teeth with those of the other gears so
that the timing marks line up as shown in Fig Aa.31.
noting that the double mark on the idler gear
up with the timing mark on the crankshaft gear.
Tighten the nuts on the camshaft and injection pump
drive shaft and secure them with the locking washers.
Check the valve timing as described
Fit the idler gear thrust washer to the shaft. with the
oil groove towards the gear.
Refit the crankshaft oil thrower with the chamfered
side towards the gear.
Replace the remaining components in the reverse
order to that in which they were removed.
Check the injection timing as
idler gear thrust washer thickness and the
in
'GENERAL
DATA.'
Section Aa.24.
in Fig. Aa.31. Slide the idler gear onto its shaft
2311
D and 18G
If
necessary. renew the
is
in Section Aa.26.
described in Section
23'1
lined
Da.
Section Aa.24
OISMANTLING
THE
Two of the timing
and
the injection pump drive
AND REASSEMBLING
TIMING
gears-those
GEARS
fitted to the camshaft
shaft-can
be dismantled
liiill!ll!
Aa.32
from their hubs without removing the hubs from their
E
shafts.
Position
Four-230
No. 6 piston
duction
stroke
the
crankshaft
No. 4 piston
is
just
commencing
as
described
or
the
Aa.23.
Remove the thrust washer and idler gear from its
shaft. and the camshaft gear and injection pump drive
gear from their hubs.
If
the idler gear bush
bush out. using tool 18G 683. with the larger bore of
the tool support uppermost. Reverse the tool support
so that its lipped end
new bush. This will ensure that the bush is correctly
positioned with its ends equidistant from the sides of
the gear. With the tool support still in this latter
position. broach the bush after first lubricating the
broach liberally with clean paraffin.
Reassemble the camshaft gear and the injection pump
drive gear to their hubs so that the timing mark on the
inner face of each gear lines up with the timing mark
on its hub as in Fig. Aa.31.
Refit the idler gear to its shaft so that the timing
marks on all four timing gears are in the relationship
shown
in Fig. Aa.31. noting that the double mark on
the idler gear
crankshaft gear.
Tighten and rewire the securing screws on the
injection pump drive gear. but leave the securing screws
on the camshaft gear finger-tight.
Adjust the valve timing as described in
Refit the idler gear thrust washer with the oil groove
towards the gear.
is
lined up with the timing mark on the
is
to be removed. press the old
is
uppermost when pressing in a
so
that
the
Six-346
its
in-
in
Section
Section Aa.26.
66
Page 70
DIESEL ENGINE
Section Aa.26
VALVE TIMING
G
Fig.
Aa.33
Valve riming diagram Four-230
E.
A. Inlet valve opens.
B. Exhaust valve
C. Exhaust valve opens.
D.
Inlet valve closes.
close.~.
Fuel injection timing
B.T.D.C.
F.
Top dead centre.
G. Bottom dead centre.
28
Section Aa.25
REMOVING AND REPLACING
THE
TIMING
Remove the timing gear case cover (Section Aa.22).
Withdraw the idler gear and the camshaft gear as
described
in
Section Aa.23.
Unscrew the idler gear shaft. which has a lefthand
thread. and the timing gear oil fee4 jet complete with
copper seal washer.
Remove the set screws securing the gear case to the
crankcase and pull the gear case. complete with
injection pump drive and the driving half of the
injection pump coupling,
on
the crankcase.
If
necessary, remove and dismantle the injection
pump drive as described in Sections Aa.27 and Aa.28.
Thoroughly clean and inspect al\ the dismantled
components.
When replacing the components, which
of
the foregoing procedure.
the crankcase and timing gear case, coating the
crankcase joint face with sealing compound.
Ensure that the injection pump drive coupling is
assembled correctly. The coupling dowel bolt must
engage the hole in the pump drive flange.
The idler gear shaft should only be tightened
sufficiently to retain it in position.
GEAR
off
fit
CASE
the three
I~cating
a new gasket between
is
a reversal
dowels
Four-
230
Engine
When timing pin AMK
wheel,
No.4
degree plate must be set
With
the timing marks on the
piston is
9990
at
engages the
250 B.T.D.C. and the
at
250 before zero.)
g~ars
correctly
r~lated
as in Fig. Aa.3I. and the valve rocker clearance adjusted
as in Section
(see 'GENERAL
Aa.II.
final adjustment of the valve timing
DATA'
and Fig. Aa.33) is made by
rotating the camshaft drive gear in relation to its hub.
the securing bolt holes in the camshaft gear being
elongated for this purpose.
Rotate the crankshaft in the normal direction or
rotation until the
50
A.T.D.C. mark is
at
the top of the
flywheel in the vertical position with No. 1 piston
commencing its firing stroke and No. 4 piston
commencing its induction stroke.
Slacken· the six set bolts securing the camshaft gear
to
its hub and rotate the camshaft
direction of rotation until the exhaust valve
No.4
cylinder is just closed.
in
the normal
(No.8)
A clock gauge. moun·ted on the engine with its
indicator contacting the valve spring collar. will
facilitate this operation. Tighten the camsllaft gear
securing bolts. recheck the valve timing, and rewire the
gear securing bolts.
An alternative method of setting the crankshaft
50
A.T.D.C.
conjunction
(1) Rotate the crankshaft in the normal direction of
(2)
is
to use a degree plate and pointer
WIth
timing pin AMK
rotation until the inlet valve
cylinder
is
just closed. No. 1 piston will now
9990.
(No.2)
as follows:
of No. 1
be commencing its compression stroke and
piston
will
be
on its exhaust stroke.
Insert timing pin AMK
hole
in
the lower half of the engine sandwich
9990
through the reamed
No.4
plate and. while maintaining pressure on the pin.
rotate the crankshaft slowly until the pin engages
the timing hole
(3)
Mount the degree plate
crankshaft, attach the pointer
position
at
to
280 (250 on engines with a Simms Minimec
in
the flywheel.
on
the front end
in
of
a suitable
the engine. and set the degree plate
injection pump) before zero.
(.1)
Remove the timing pin and rotate the crankshaft
to bring the
plate
in
shaft will now be
piston
50
after zero mark on the degree
line with the timing pointer. The crank-
at
50
on
its induction stroke.
A.T.O.C
.•
with No. 4
fly.
of
at
in
the
67
Page 71
Six-346
THE ENGINE
To facilitate retiming, one tooth on each gear, with
the exception
'0'
or
drill dimple
of
the idler gear,
(see
Fig. 28). The correspond-
is
marked with an
ing teeth on the idler gear which mesh with the
marked tooth on the camshaft drive gear and the
fuel
injection pump/exhauster drive gear are
identified with similar marks, while the
corresponding teeth which mesh with the marked tooth on the
crankshaft gear are marked with
drill dimples. Also, the faces
pump drive hub, the camshaft
'OC'
or twin
of
the fuel injection
flan8C
or
drive hub, and their drive gears are stamped with
'0'
marks to ensure correct timing relationship
between these components.
Assemble the drive gear to the fuel injection pump
face
drive hub, lining up the
of
the hub with the
'0'
'0'
mark on the
mark on the face
of
the
gear. In a similar manner, assemble the drive gear
to the camshaft, lining up the
of
the gear and the camshaft flange
'0'
marks on the faces
or
drive hub,
but do not lock the securing bolts at this stage as
final adjustment
of
the valve timing has still to be
carried out.
If
necessary, after first ensuring that the valve
rocker adjusting screws are fully released, rotate
the crankshaft to position No.
6 piston
at
T.D.C.
on its induction stroke. The tooth with the timing
mark on the crankshaft gear will now be between
11
and
12
o'clock (see Fig. 31).
Rotate the camshaft to position the gear tooth
with the timing mark between eight and nine
o'clock and then
tum
the fuel injection pump
drive gear so that its tooth with the tim-
is
ing mark
Fig.
31:).
between three and four o'clock (see
Fit the idler gear to its shaft with the marked teeth
on the drive gears engaging the corresponding
teeth on the idler gear as shown in Fig.
31
Fit the idler gear thrust washer with the oil groove
in the washer next to the gear.
The valve timing may
be
checked, using a degree plate
and pointer, a dial-gauge, and timing pin AMK
follows:
(1) Set
(2) Insert timing pin AMK
No.6
cylinder inlet valve clearance to
(·53 mm.) then crank the engine until
is
on its firing stroke.
9990
through the reamed
hole in the lower half
Maintain pressure on the head
of
the engine sandwich plate.
of
No.6
the pin, and
crank the engine until the pin engages the timing
F
G
Vah'c
timing diagram-Engille fyl'('
A. Inlet valve opens.
n.
Exhaust valve closes.
c. Exhaust valve opens.
1>.
]nlet valve closes.
hole
in
the
flywheel.
E.
Fuel
retarded)
....
Top dead centre.
G.
Bottom dead centre
No. 6 piston
Six
inj~'Ction
timing (fully
14' B.T.D.C.
140 B.T.D.C. on its exhaust stroke.
(3)
Mount the degree plate on the front end
crankshaft and attach the pointer
position on the timing case.
at
140 before zero then remove timing pin AMK
Set the degree plate
in
9990.
9990, as
·021
in.
piston
- 34 6
.•
is
now
of
the
a suitable
68
(4)
Mount the dial gauge on the cylinder head with
its indicator resting on the collar
of
No.
~
Page 72
DIESEL ENGINE
/~
"
Fig. Aa.34
Checking the camshaft end-float
Section Aa.27
REMOVING AND REPLACING
TIlE
INJECTION PUMP DRIVE
Remove the injection
Remove the blanking plate from the timing gear case
and
cover.
injection
Remove the six set bolts securing the injection
drive to the timing gear case
pump
separate the drive shaft from its drive gear.
When replacing the drive housing ensure that the
joint faces of the timing gear case and the drive housing
are clean.
timing
drive housing gasket.
Replace the remaining components by reversing the
removal procedure.
Bleed the fuel system as described in
unlock
pump
drive shaft.
drive. using tool 18G loo8B to
Smear the joint face on the rear of the
gear case with jointing compound, and
Section Aa.28
DISMANTLING AND REASSEMBLING
THE
INJECTION PUMP DRIVE
Slacken the clamp bolt nut on the coupling driving
flange and withdraw the flange from the drive shaft.
Extract the coupling key from the drive shaft and
remove the end cover, complete with oil seal, from the
drive housing.
Remove the cover plate from the front of the drive
housing and press the shaft out of the housing in a
forward direction
from the housing as the drive shaft
Extract the drive gear key from the drive shaft.
Press the small ball bearing out of the rear of the
housing and remove the oil seal from the end cover.
Clean
and
inspect all the dismantled components.
Commence reassembly by pressing the large ball
bearing into the front of the housing. Refit the front
pump
(Section Da).
and
unscrew the
and
withdraw the injection
The
large bearing will be ejected
nut
Section Da.
is
pressed out.
from the
pump
fit
a new
cover plate and when the countersunk screws are fully
tightened, lock them in position by peening.
Fit the drive gear key to the front of the shaft and
insert the shaft into the housing from the rear end
until the flange on the shaft is against the bearing.
Pass the small ball bearing over the shaft and press
the bearing into the housing until it contacts the
shoulder in the housing.
Fit the oil seal into the end cover so that its sealing
lip
fJc(;:s
towards the bearings.
SmeJr the joint face of the end cover with sealing
compound and relit the end cover
being ca:eful not to damage the oil seal.
Refit the coupling key and driving flange.
Inject a liberal quantity of clean engine oil through
the hole
lubrication
in
the top of the drive housing to provide initial
un
til
the oil
in
the engine
to
the drive housing,
is
circulating.
Section Aa.29
REMOVING AND REPLACING
THE
CAMSHAFT
Remove the timing gear case cover (Section Aa.22).
Withdraw the camshaft drive gear (Section Aa.23).
•
Remove the rocker cover and slacken fully the valve
rocker adjusting screws. Withdraw the pushrods.
Remove the fuel lift
Disconnect the external oil pipe from the main oil
gallery and cylinder head.
Remove the tappet and pushrod cover and the oil
level indicator guide from the side
Lift
out
the tappets.
Remove the camshaft thrust plate and withdraw the
camshaft. being careful to avoid damage to the bearing
surfaces as the camshaft is withdrawn.
Thoroughly clean and inspect all the dismantled
parts.
Check the camshaft bearing clearance against the
dimensions in
Fit the thrust plate and the drive gear to the
camshaft. tighten the camshaft nut,
camshaft end-Boat
dimension given in
If
necessary. remove the locating bolt and withdraw
the camshaft front bearing from the cylinder block.
Press a new bearing into position, plain edge first.
aligning the
in
the bearing housing. When the bearing is in position
the holes can be tapped into final alignment. using a
'GENERAL DATA.'
rwo
holes in the bearing with the two holes
pump
of
the cylinder block.
and
check the
as
shown in Fig. Aa.34 against the
'GENERAL DATA.'
69
Page 73
DIESEL ENGINE
soft drift against the aligning notch
the locating bolt and line-ream the bearing to the
dimension given in 'GENERAL DATA.'
Replace the remaining components, lubricating all
the bearing surfaces with clean engine oil,
the
removal procedure.
Adjust the valve rocker clearance
Section Aa.11 and bleed the fuel system of air I
in
the bearing. Fit
by
reversing
as
described in
Section Aa.30
REMOVING AND REPLACING
THE
FLYWHEEL AND STARTER RING
Remove the
Unlock and remove all but two of the bolts securing
the flywheel to the crankshaft flange.
remaining bolts sufficiently to allow the flywheel to
drawn off the crankshaft flange.
Withdraw the flywheel by screwing two
bolts into the withdrawal holes
remove the
Examine the flywheel face and the starter ring teeth
for wear against the figures given in 'GENERAL
DATA.'
If
necessary, remove the starter ring by drilling a hole
in
the ring and splitting
and
chisel_
Ensure that the bore of the new starter ring and its
mating surface on the flywheel are perfectly clean and
free from burrs. Heat the starter ring uniformly to the
temperature given in 'GENERAL DATA.' The strip
of
temperature-indicating paint on the starter ring will
change from greyblue to buff colour when the
temperature
Transmission
two
remaining flywheel
it
is
correct.
Unscrew the two
be
tin. UNF.
in
the flywheel, and
bolts_
across the hole with a hammer
Section Aa.31
REMOVING AND REPLACING
THE
ENGINE SANDWICH PLATE
Remove
the flywheel (Section
Remove the starter motor
Unscrew the set bolts securing the sandwich plate to
the cylinder block, and pull the sandwich plate
three dowels which locate it on the cylinder block.
Remove
Replacement
using a new joint washer between the sandwich plate
and the cylinder block.
the
Transmission
Aa.30).
the
sandwich plate joint washer.
is
a reversal of the foregoing procedure,
Section and
off
the
Section Aa.32
REMOVING AND REPLACING
THE
CRANKSHAFT AND MAIN BEARINGS
Remove the sump
(Section Aa.6), and the timing gear case cover (Section
Remove
Aa.22).
Remove the oil thrower from the front end of the
crankshaft and withdraw the oil pump driving gear and
the crankshaft gear, using tool
18G
231
B.
Withdraw the two halves of the crankshaft
thrust washer from the front main bearing.
Remove the
sandwich plate
flywheel (Section AL30) and the engine
(Section AL31).
18G
the oil pump
231
and adaptors
-
..
_--'"
Place the heated starter ring, bore chamfer foremost,
squarely
the ring to
hardwood across the ring and pressing or tapping
until the starter ring
the ring is cold the 'shrink'
established and no further treatment
dowels are not a loose
are
to ensure correct positioning of the flywheel.
Tighten the flywheel bolts
the torque figure given in 'GENERAL DATA.'
Check the flywheel alignment with a clock gauge,
against the figure given in
Lock the flywheel bolts and replace the rem
components by reversing the removal procedure.
on
the flywheel. The expansion should allow
be
readily fitted by placing a piece of
is
hard against its register. When
fit
will
be
permanently
is
necessary.
When replacing the flywheel check that the locating
fit
in their holes, and that they
free from burrs. The dowels are diagonally offset
in
diagonal sequence to
'GENERAL
DATA-'
a
;,,;",
70
it
Fig.
Checking the crankshaft
return
thread
Aa.35
rear
oil seal cover to oil
clearance
Page 74
Aa
Fig. Aa.36
The arrow indicates the gauge paper used whell
checking the diametrical clearance
bearing
main
DIESEL ENGINE
of
a crankshaft
Fig. Aa.37
Checking the crankshaft end-finat
Remove the connecting rod bearing caps' and shells.
shel1s
keeping the
replacement. and separate the connecting rods from the
crankshaft.
Unscrew the two bolts holding the two halves of the
crankshaft rear oil seal cover together. Remove the
bolts securing the bottom half of the cover to the
crankcase and remove the bottom half cover. taking
to
care not
in
any way the top half of the cover should
and a new gasket fitted.
Remove the main bearing caps complete with the
bottom halves of the main bearings. The crankcase
and caps are marked for correct assembly. and the
bearings and caps should always be replaced in their
original positions.
Lift the crankshaft out of the crankcase and remove
the remaining halves of the bearings and the thrust
washers.
Thoroughly clean and inspect all the dismantled
components and examine all bearing surfaces for wear
or scoring.
Check the crankshaft endfioat and main bearing
clearance against the figures given in
DATA.'
New bearings are prefinished to size and
require any scraping or fitting.
When replacing the crankshaft lubricate all the
bearings with clean engine oil and ensure
hollow locating dowels are in position over the main
bearing studs
Refit the crankshaft rear oil seal cover and check
that the clearance between the cover and the oil return
thread on the crankshaft is in accordance with the figure
'GENERAL DATA.' The ftat surface of the bottom
in
half of the oil seal cover should be perfectly level with
the crankcase surface
damage the gasket.
with their respective caps for correct
If
the gasket
before fitting the bearing caps.
to
which the sump
is
be
'GENERAL
is
mounted.
damaged
removed
do
not
that
the
Before attaching the connecting rods to the crank·
shaft. align the marks
in Section Aa.23.
Replace the remaining components
removal procedure. refill the sump with new engine oil.
bk:ed the fuel system of air as described in Section
and
Da.
on
the timing gears as described
by
reversing the
Section Aa.33
MODIFIED INLET VALVE LOCATING
A new type inlet valve locating key and thimble. and
a modified valve guide locating dowel have been
introduced on later engines. These parts. which
facilitate the assembly of the valves to their guides. are
interchangeable in sets with their equivalent parts
referred to in
The installation
use when the original
removed
installed,
is
to be adapted
ment to a
B.
It
is
mission
tion of rotation of an engine
this manual
of the engine
output end
wise
rotation and a counterclockwise rotation of
the engine
A
letter
transmission
trated
indicates whether the
use
with a
engine.
C. The hydraulic
the engine in the following
1.
Insert
transmission
engine
2.
Place
so that the
matching holes in the
housing flange.
have been designed
is
se1£-
contained, having an oil
system
from engine lubricating oil
important that the engine and
rotations
rotation of the engine
- "R"
in Section It "SPECIFICATIONS",
and oil supply completely
pressure
or
reverse
instructions
transmi
for
servicing
or
when the
marine
is
two
adapter
the
engine.
are
as
the
crankshaft
of
the
a left hand rotation.
or
serial
right
transmission
3-1/2"
mounting holes in the
plate.
transmission
studs
transmission
as
non-original eqUip-
matched. The
direction'
as
transmission. A clock-
"L"
appearing on the
number
transmission
or
left hand rotating .
studs in opposite
go through two of the
for
marine
drive.
below
ssion
and
must
is
of
viewed from the
is a right
plate
is
attached to
manner:
against the
transmission
smooth
use.
The
systems.
is
used to
The
for-
are
for
has
been
be
re-
unit
transdirec-
defined in
rotation
hand
illusis
for
studs
TRANSMISSION
ward
drive
is
through a multiple disc clutch
arrangement,
a
reverse
train.
cooled through a
core,
water.
with
Gear
model identification
Section I, under
D.
E. Connect the oil
The
which
Paragon
either
reduction
4. Install and tighten four bolts with lockwashers
housing flange into the engine
plate. Remove the
and tighten the two remaining bolts
with lockwashers through the
mission
The
transmission
pling
propeller
mission,
consequent damage to the
engine, and boat hull during operation.
To align the coupling, move the
shaft, with attached coupling flange, toward
transmission
the
propeller
miSSion shaft coupling flange
tact.
in contact throughout
ference. The total runout
the faces should not exceed
point. If the runout
tion the engine and attached
by loosening the engine support bolts and
adding
either
move the engine sideways to adjust the
runout
faces
bolts and
coupling before bolting the coupling flanges
together. Connect the coupling flanges with
bolts, lockwashers, and nuts.
mission.
while the
clamp
transmission
separate
is
in
transmissions
direct
"SPECIFICATIONS".
through the transmiSSion
housing flange.
must
be
shaft
in
order
shaft coupling flange and
The coupling flange faces should be
or
removing
end of the engine.
or
to align the coupling flange
laterally.
recheck
reverse
band and planetary
oil
turn
cooled
drive
ratios
numbers
3-1/2"
and
propeller
carefully
is
connected to the
to avoid vibration and
so
that the faces of the
their
exceeds .002",
shims
Tighten
the alignment of the
cooler
drive
is
circulated
external
by
are
or
reduction
and corresponding
are
studs. Install
aligned before the
transmission,
are
entire
or
gap between
.002" at any
transmission
to
raise
If
the engine support
lines to the
utilizes
oil
the engine
furnished
listed
shaft
propeller
circum-
or
necessary,
gear
and
cooler
gears.
in
adapter
trans-
cou-
trans-
trans-
in
con-
reposi-
lower
trans-
3.
Slide the
toward the engine so that the spline on
the shaft
enters
engine vibration dampener.
transmission
at
the front of the
the matching splined hole in the
along the
transmission
studs
F.
Connect the shift
cockpit
control
page 5.
valve
control
valve
Place
lever
control
station
lever,
the transmiSSion control
in the
cable
to the
shown in
neutral
from the
transmission
Figure
position and
on
75
Page 79
adjust the shaft
the cockpit
in the
control
positions
neutral
hand
several
transmission
The
transmission
control
control
station hand
position. Move the cockpit
lever
to forward and
times
control
control
move fully into forward
lever
when the hand
is
cable
length until
lever
reverse
while observing the
valve
lever
valve
lever
or
reverse
moved into
motion.
should
position
forward
is
or
reverse
exactly to the
hand
lever
position, and should
neutral
is
in the
position when
neutral
position.
G. Remove the oil dipstick, shown in
on page 5, and fill the
Type A
transmission
transmission
fluid to the
mark
the dipstick. Replace the dipstick in the
transmission
housing.
return
the
Figure
with
on
IV.
OPERATION
Principle
The
are
sure.
the
transmission
external
returned,
distribution tube and
valve maintains the oil
closed
When
forward
livered
which moves to
planetary
discs
pling in the
reverse
control
oil under
piston. The
the
case,
of Operation
transmission
operated
An
by
internal
oil
cooler.
still
until the oil
the
control
pOSition, oil
to the multiple
reverse
and
case
direction
drive
lever
to the
pressure
reverse
reverse
band around the
preventing the
forward
transmission
gear
type oil pump C1elivers
oil,
under
The
under
pressure,
relief
pressure
pressure
lever
under
clamp
the clutch
gear
then revolve
of engine rotation. The
is
engaged by shifting the
reverse
is
delivered
piston moves to
planetary
from moving but allowing the
to revolve to
shaft in a
drive
direction
the 9utput
opposite to the rotation
of the engine. With the
neutral
poSition,
pressurized
from entering the clutch piston
band piston and the
stationary
.
propeller
and
reved.
oil
undar
pressure,
transmission
to the
valve. The
by remaining
reaches
is
shifted to the
pressure
disc
clutch piston,
case
together. The
as
a solid
poSition,
to the
planetary
gear
planetary
or
control
lev~r
oil
is
or
shaft
drives
pres-
to the
oil
is
oil
relief
60
PSI.
is
de-
discs
and
cou-
so
that
reverse
clamp
gear
case
gears
propeller
in the
prevented
reverse
remains
Starting
1. Always
Procedure
mission
start
the engine with the
in NEUTRAL to avoid moving the
boat suddenly forward
2. When the engine
to idle
for a few
and check the
oil
if
necessary
to the
mark
is
moments. Stop the engine
transmission
to
on the
NOTE
ON
SUBSEQUENT
TRANSMISSION
ST
OIL LEVEL
CHECKED BEFORE
ENGINE,
WHEN
ENGINE
CHECKED.
3.
Start
the engine again, with the
in NEUTRAL, and allow the
up to operating
4. Shift the
REVERSE
stall
when the
FORWARD
mission
in NEUTRAL before
temperature.
transmission
as
desired.
transmission
or
REVERSE,
engine.
It
is
recommended that shifting
speeds
the
below 1000 RPM, and
800 RPM,
or
idle engine range, to
long the life of the engine,
and boat.
higher