Robin EC12 Service Manual
SERVICE
MAIINJAL
Model
EC12
OIL MIX & OIL INJECTION ENGINES
puB-Esl173
Rev. 8/98
CONTENTS
Section
Title
Page
1
.
2
.
3
.
4
.
5
.
6
.
7
.
8
.
9
.
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-1
0
4-1
1
MODEL
ECIPD
STD.,
EC12D
1
OIL
INJECTION SYSTEM
Type
of
Number
Bore
Piston Displacement
Horsepower
Max.
Direction
Fuel
Fuel
Lubricant
Lubrication
cylinder,
x
Stroke
Toque
of
Rotation
Consumption
oil
Continuous
(Mixed
Air-Cooled, 2-Cycle, 1 -Cylinder, Gasoline-Engine
1
7.5
Counterclockwise
Automobile Gasoline
with
Oil.
Mixing
Ratio
360
Gasoline
(Mixing
Oil
Mixing Type
Ratio
25
to
-
54
x
50
1
14cc
.
-.
22
kW
(3.0
2.9 kW
I
g
50:l)
(4.0
N-rn
(0.76
25
to
50:l)
/
HP.
hr
2-Cycle Engine
mrn
(2.13 x 1.97
(6.98
HP)
HP)
kg-m
as
viewed
I
I
0
3.0
I
cu.in)
/
3600
I4000
)
I3000
from
HP/
3600
Oil
O~I
in)
rpm
rpm
rprn
PTO
Shaft
Automobile Gasoline
rprn
separate fueling system
Carburetor
Method
spark
Starting System
Governor
Air
Dry Weight
Dimensions Width
of
Plug
Cleaner
ignition
Length
Height
Float Type
Flywheel Magneto
NGK
BMGA I CHAMPION
~ ~ ~
Recoil Starter
12.0
273
326
307
Type
kg
mrn
rnrn
rnm
(Solid State Ignition)
CJ8
(26.0
Ibs)
(10.7
in.)
(12.8
in.)
(12.1
in.)
-1-
2.
2-1
MAXIMUM
OUTPUT
The maximum output
is
the output
of
an engine with its throttle valve fully opened under the condition
that all the moving parts are properly
worn
in after the initial break-in period.
A
new engine may not produce full maximum output while its moving parts are still
not
broken-in.
2-2
CONTINUOUS
RATED
OUTPUT
The
continuous rated output
is
the output
of
an
engine at optimum
governed
speed which is most
favorable from the view point
of
engine’s life and fuel consumption.
When the engine
is
installed on a certain equipment, it
is
recommended. that the continuous output
required from the
engine
be
kept below this continuous rated output.
2-3
MAXIMUM
OUTPUT
The maximum torque is the torque at the output shaft
when
the engine
is
producing
maximum output at
certain revolution.
-2-
2-4
PERFORMANCE
CURVES
Nm
(kgf-m)
HP
4
3
0
kW
3
2
1
-0
2000
3000
4000
5000
REVLOUTION
-
r.p.m.
3.
FEATURES
3-1
COMPACT,
LIGHT
WEIGHT
AND
HIGH
POWER
Compact and light weight engine thanks to
3-2
SUPERB
Rugged design on each engine components and employment
a long lasting durability even
3-3
SfMPLE
Maintenance free and
governor system.
Easy
34
SUITABLE
Robin
your equipment,
3-5
OIL
Oil
and gasoline are placed into separate tanks. Therefore, mixing the fuel/oil which
troublesome, is
Because the fuel
Since
The mixture ratio has become leaner, which will decrease white smoke during operation.
DURABILITY
STRUCTURE,
start
with decompression
FOR
EC12
INJECTION
only
engine has the identical mounting flange
gasoline
in
harsh applications.
EASY
high
REPLACEMENT ENGINE
EC12
SYSTEM
now
is
engine
done automatically
gasoline, the
is
in the carburetor, there
MAINTENANCE
vibration proof
hole
on
can
replace
(OIL
INJECTION
start
short
connecting rod and aluminum cylinder.
have
exhaust system.
EClO
by
ability
engines.
TYPE)
engine function.
of
the
engine for the reason
will
be
of
high
anti-vibration dust cover enable
been achieved
as
EClO
no
jet choking due to the deterioration
thanks
engines. Without
to the crankcase built in
can
be improved.
any
modification on
often
can
of
be
oil.
4.
GENERAL
4-1
ALUMINUM CYLINDER AND CRANKCASE
Aluminum die-cast cylinder with molded-in cast
iron liner has intake, exhaust
on the liner. For easy starting, decompression hole
is implemented on the exhaust port.
Crankcase is divided into two pieces
(Flywheel
Governor chamber
gasoline-oil mixture fuel lubricates the governor
system.
side) and crankcase
DESCRIPTION
and
scavenging
:
2
(P.T.O.
is
built in
the
crankcase
OF
ports
crankcase
side).
2
and
1
ENGINE
-4-
COMPONENTS
Fig.
4-7
4-2
CYLINDER
HEAD
Alumin’um die-cast made cylinder head has semi-
for
sphere shaped combustion chamber
optimal
combustion and higher efficiency.
49
CRANKSHAFT
AND CONNECTING
ROD
Forged steel crankshaft assembled with hardened
crank
pin
and
connecting rod, precision balanced
for low engine vibration, durability, greater shock
loading resistance
are implemented
rod.
As
these
special
jig
and
crankshaft assembly
crankshaft
or
and
longer life. Needle bearings
on
both
ends
of
the connecting
parts
are
press-fitted together
are
unable to be disassembled,
needs
to
be serviced
in
case
connecting rod need to be replaced.
by
1
Fig.
4-2
4-4
PISTON
High strength aluminum alloy made
two
piston rings.
knocks are pressed
Top
ring is key-stone type and is chromium plated.
Second ring is a plain type and
AND
PISTON
RINGS
piston
To
avoid piston ring rotation,
in
piston ring grooves.
is
parkerlized.
equips
fig.
4-3
Top
Key stone
Chromium
Plain
Parkerlrized
ring
type
plated
type
-5-
4-5
ALL
SPEED
GOVERNOR
Rapid response mechanical flyweight type
ernor system
for
long'
speed regulation
4-6
COOLING
Forced air
is
fully lubricated with oil mixed fuel
life and which enables more precision
and
better reliability.
SYSTEM
cooling
is done by flywheel
fan.
gov-
Alu-
minum die-cast flywheel fan ensures better cooling and durability.
I
4-7
CARBURETOR
EC12
retor that
is
equipped with a horizontal draft carbu-
has
a float controlled
fuel
system and a
fixed main jet. Carburetor is calibrated carefully
good
for easy starting,
sumption
and
sufficient output.
acceleration, low fuel
con-
Fig.
Fig.
4-6
4-7
-6-
4-8
AIR
CLEANER
Rugged semi-wet dual stage air cleaner with high
0
efficiency, ease
of
service
and
longer engine life.
4-9
IGNITION
SYSTEM
Solid state, high 'energy electric ignition
which
referred to
as
T.
C.
I.
(Transistor Controlled Igni-
tion) gives more precise ignition timing,
no
break-
er points
to
service, ease
of
maintenance and
longer spark.plug life. Ignition system
is
consisted
of
flywheel
magneto and
ignition
coil.
Flywheel
is
installed
on
crankshaft
and
ignition coil is
on
crankcase.
Ignition timing
is
18
BTDC.
(Before
Top Dead Center)
4-10
OIL
INJECTION
SYSTEM
The
oil
injection system
is
a device that uses
an
oil
pump
directly
driven
by
a
crankshaft
to forcefully
feed
lubrication
oil
to
the
air intake
port
of
a
cylinder.
According to engine speed, the appropriate amount
of
oil is measured and fed.
Element
\
Fig.
4-8
I
Fig.
4-9
Fig.
4-10
-7-
4-11
SECTIONAL
VIEW
OF
ENGINE
*EC12D
STD.
SPARK PLUG CAP
SPARK
PLUG
CYLINDER
CRANKCASE
2
-8-
I
FLYWHEEL
(COOLING FAN)
GOVERNOR
I
/
LEVER
/
EXHAUST
-9-
*EC12D
OIL
INJECTION
TYPE
SPARK
PLUG CAP SPARK PLUG
CYLINDER
OIL
TUBE
-
10-
MUFFLER
/
EXHAUST
-
17
-
5.
DISASSEMBLY
5-1
PREPARATIONS
AND
SUGGESTIONS
(1)
When disassembling the engine, memorize the locations
of
individual parts
so
that
they
can be
reassembled correctly.
If
you are uncertain
of
identifying some parts,
it
is suggested that tags be
attached to them.
(2)
Have boxes ready
to
keep disassembled
parts
by
group.
(3)
To
prevent losing and misplacing, temporarily assemble each
group
of
disassembled parts.
(4)
Carefully handle disassembled
parts,
and
clean
them
with
washing
oil
if
necessary.
(5)
Use
the
correct tools in the correct
way.
5-2
SPECIAL
TOOL
Tool
No.
US€!
Tool
209-95004-07
For
pulling
off
the
flywheel
Flywheel puller
with
bolt
Table.
5-1
Flywheei puller
fig.
5.1
-
12-
53
DISASSEMBLY
Part
Step
1
1.
1
Air
I
to
remove
cleaner
PROCEDURES
1
(1)
Remove
(2)
Detach
M6
......
......
I
(3)
Remove cleaner base.
M6
air
air
cleaner bracket
X
12mm
2
pcs
on
1
pc.
on cylinder
Self
lock
Procedures
cleaner
bolt
air
nut
cover
and
cleaner
.....
and element.
spring
-2
pcs
wahser
1
Detach
from
Remarks
air
vent
carburetor.
pipe
I
lOmm
Tools
box
wrench
I
I
Cleaner cover
1
-
13-
Fig.
5-2
Part
to
remove
Procedures
1
(2)
Disconnect fuel hose
(3)
Remove carburetor carefully unhooking
governor
governor lever.
I
rod
and
from
rod
carburetor.
spring
from
I
Be careful
governor
governor
I
Remarks
not
rod
or
spring.
to
bend
stretch
Tools
I
Carburetor
I
-
OIL
lNJECTlON
Fig.
14
-
TYPE
(insulator)
5-3
%art
to
remove
ProcedureS
:
Remarks
Speed
control
lever
and
governor
lever
(1)
Unhook governor spring
lever. not
(2)
Remove Cover, washer
control
M6
(3)
Detach governor lever 'together with
adjusting
M6
X
8mm
nut
lever.
flange bolt
~~ ~
plate.
. . ..
.
-1
PC.
from
(fiber)
......
governor
and
1
pc.
speed
Unless
lever
lever
Note'governor spring
hole
it
is
required,
remove
on
and
governor
from
carankcase.
governor
control
do
lever.
Needle nose
1
1
Omm
Socket wrench
M6
-
15-
Fig.
5-4
%art
to
remove
Muffler
Procedures
Tools
Remarks
~~ ~
(1)
Remove muffler bracket
on
the
top.
12mm
Socket
M8
X
16mm
bolt
and
washer
. .
..
.
.,4
pcs
wrench
(2)
Remove muffler bracket
on
the
bottom.
M8
X
16mm
bolt
and
washer
......
3
pcs
(3)
Remove muffler.
M8
brass
nut
......
2
pcs
fig.
5-5
-
16-
Step
Part
to
remove
PtO&d"&!.
Remarks
Tools
5.
Cylinder
Recoil starter.
6.
Starter
7.
Blower
housing
pulley
(I)
Detach spark plug
(2)
Unplug spark plug cap
cap.
from
cord.
(3)
Remove cylinder baffle.
M6 X 16mm tapping
M6
X
8mm
flange
M6 X 12mm flange
(4)
Clamp
removed
(1)
Remove recoil starter.
(2)
Remove starter pulley
M6
(1)
(2)
Remove blower housing
M6
on
engine stop switch wire
same time.
X
12mm
bolt
X
25mm bolt and washer
Disconnect
X
stop switch
20mm
bolt
M6 X55mmboltandwasher
(3)
(4)
Clamp
Same
Detach
on
blower
time.
grommet
bolt
bolt
bolt
and washer
and
wire.
and washer
housing
on
high tension
high tension baffle
.....
......
......
spacer. and spacer
from
to
be
(black)
.3
pcs
1
pc.
1
pc.
to
be
......
4
pcs
.....
-3
pcs
crankcase.
.....
-3
pcs
......
2pcs
removed
cord.
lOmm
Socket
wrench
1
Omm Socket
wrench M6
I
Omm
Socket
wrench
-
17-
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