DRIVING RECOMMENDATIONS
Cylinder wear is minimized ifthe engine is warmed
up quickly
by driving away as soon as oil is circulating after
stading the
engine. Do not race the
engine to speed up the process but, if
possible, maintain a speed of approximately 25 m.p.h.
until the
choke can be
pushed
fully in.
In
warm
climates, use of the choke
may be unnecessary. Avoid the
use of full throttle during the
warmiog-up period. A themostat incorporated in
the cooling
system
enables the engine to
be
warmed
up quickly from cold.
Starting with the Engine Warm or Hot
When
re-starting
a hot engine, depress the accelerator
pedal
to about one-third ofits travel
before operating the starter switch.
The choke conrrol should not be used.
Recornmetrded Speed Limits
Avoid over-rewing,
particularly in the iower gears. The driver
is advised not to drive the
car continuously atengine speeds above
5,000 r.p.m.
in
any gear. However, whilst accelerating
through
the
gears
it is
permissible
to
attain 5,500 r.p.m. for short periods,
these speeds being indicated
by the beginning and the end of the
red segment on the tachometer.
When an overdrive
is fitted, do not change from overdrive
to normal 3rd or 2nd
gears
at
engine speed exce€ding 4,500 r.p.m.,
otherwise damage may result from
"over-rewing".
Overdrive Unit
(when
fitted)
Ao overdrive unit senes
as a convenient method ofproviding,
at wili, a numericalll lower
overall gear ratio ro redice enginl
speed and wear, and to efect fuel
economy,
t4
The Laycock de Normanville
overdrive unit incorporal
an
epicyclic gear train which is engaged,
to give overdri
condition,
by a cone clutch moving under the influence
of t
hydraulic
pressure genemted by a small piston pump. Wh
pressure is released, via a control valve, the
clutch is return
and held
in direct drive by compression
springs, A ur
directional roller
clutch enables the change into, or out
(
overdrive to be made when transmitting
full power, without lc
of road
speed.
The hydraulic
control valve is linked to an electro-magne
solenoid which is operated, via a relay,
by a two-position swit
mounted
on the stee ng column.
Greatest benefit
will
accrue from
judicious
use of the ov(
drive, the
governing
factor
being
that
the vehicle continues
run
easily without sign of engine labouring,
combined wj
the ninimum
amount of throttle opening necessary to mainte
this condition.
Suggested
minimum
engagement speeds are:-
Top gear 40 m.p.h.
Third gear
30 m.p.h.
Do not change from overdrive to normal drive
at engj
speeds in excess of 4,400 r.p.m.
The above disengagement
speed corresponds approximatl
to peak revs.
in
norrnal gears. Disengagement of the O/D
a speed higher than that
stated
may
cause damage fr(
"over-revving".