Robin EC05 Service Manual
ROBIN
AMERICA, INC.
ROBIN
TO
WISCONSIN
ROBIN
ENGINE
MODEL
CROSS REFERENCE
LIST
ROBIN
EY08
EY15
EY 15V
EY20
EY2OV
EY23
EY28
EY3
5
EY40
-
EY45V
EY2
1
EY44
EY 18-3
EY25
EY27
EH11
EH12
EH15
EH17
EH21
EH25
EH30
EH30V
EH34
EH34V
EH43V
EC13V
DY23
DY27
DY30
DY3
5
DY4 1
WISCONSIN
ROBIN
SIDE
VALVE
W
1-080
W1-145
W1-145V
W1-185
W1-185V
W1-230
W 1-280
W
1-340
W 1-390
Wl-45OV
EY21W
EY44W
EY18-3W
EY25W
EY27W
OVERHEAD
VALVE
WO1-115
wo1-120
WO1-150
WO1-170
wo1-210
WOl-250
WO 1-300
WO1-300V
WO1-340
WO
1
-340V
WO 1-43 OV
TWO CYCLE
WT1-125V
DIESEL
WRD
1-230
WRD
1-270
-1-300
WRD1-350
WRD1-410
0
0
0
CONTENTS
Section
Title
Page
1
.
SPECIFICATIONS
...........................................
1
2 .
PERFORMANCE
............................................
2
2.1
.
Maximum Output
.......................................
2
2.2
.
Continuous Rated Output
..................................
2
2.3
.
Maximum Torque and Fuel Consumption Ratio
at
Max
.
Output
........
2
3
.
FEATURES
................................................ 5
4
.
GENERAL DESCRIPTION
of
ENGINE CONSTRUCTION
................
6
4.1
.
4.2
.
4.3
.
4.4
.
.
4.5
.
4.6
.
4.7
.
4.a
.
4.9
.
4-1
0
.
4-1 1
.
4- 1
2
.
4-1 3
.
4.14
.
4-1 5
.
Sectional View of Engine
..................................
6
Crankcase
.............................................
14
Baseplate
.............................................
14
Crankshaft and Connecting
Rod
Assy
..........................
14
Piston
...............................................
14
Driving Shaft (for Model B only)
.............................
15
Cylinder
..............................................
15
Cylinder Head (Model EC10.17.2
5.2
only)
......................
15
Governor
..............................,...............
15
Cool'ing
..............................................
15
Ignition
..............................................
15
Carburetor
............................................
16
Air Cleaner
............................................
16
Reduction Equipment
(for
Model B only)
.......................
16
Starting Pulley or Recoil Starter
.............................
16
5
.
INSTALLATION
.............................................
17
5.1
.
Mounting
.............................................
17
5.2
.
Ventilation
............................................
17
5.3
.
Exhaust
Gas
Evacuation
...................................
17
5.4
.
Fuel System
...........................................
17
5.5
.
Power Transmission to Drive Machines
.........................
17
5.6
.
Wiring
...............................................
18
6
.
DISASSEMBLY
and
REASSEMBLY.
...............................
20
6.1
.
Preparations and Suggestions
................................
20
6.2
.
Special Tools
..........................................
22
6.3
.
Disassembly
and
Reassembly Procedure
........................
24
7 . MAGNETO
7.1
.
Magneto.
7.2
.
Breaker Point Adjustment
7.3
.
Timing Adjustment
7.4
.
Magneto Trouble Shooting
8
.
GOVERNOR
8.1
.
Construction and Operation
8.2
.
Governor Adjustment
8.3
.
High Speed Adjustment
9
.
CARBURETOR
9.1
.
Construction and Operation
9.2
.
Disassembly and Reassembly
9.3 .
10
.
RUN-IN
I1
.
TROUBLE SHOOTING
11.1
11.2
11.3
11.4
11
11.6
11.7
Adjustments
OPERATION
.
Starting Difficulties
.
Slow-Speed
.
Overheating and Knocking
.
Power Drop
.5
.
Excessive Fuel Consumption
.
Engine Hunting
.
Other Complaints
................................................
..............
;
..............................
..................................
......................................
.................................
...............................................
................................
....................................
...................................
.............................................
................................
................................
...........................................
of
REASSEMBLED ENGINE
....................
........................................
......................................
out
of
order
...................................
.................................
...........................................
................................
.........................................
.......................................
29
29
29
30
31
32
32
34
36
38
39
39
41
42
43
43
44
44
45
45
45
45
0
12
.
CHECKS and CORRECTIONS
13
.
MAINTENANCE and STORING
13.1
.
Daily Checks and Maintenance
13.2
.
Every 50 Hours
13.3
.
Every
100-200
13.4
.
Every
500-600
13.5
.
Every
1000
Hours
13.6
.
Preparation for Long Abeyance
...................................
..................................
..............................
(10
Day) Checks and Maintenance
Hours (Monthly) Checks and Maintenance
Hours (Semiannual) Checks and Maintenance
(Yearly) Checks and Maintenance
.................
...............
..............................
...........
.........
46
53
53
53
53
53
54
54
.-
1.
SPECIFICATIONS
1
0
0
'4
c
.
f
Lo
5-
0
m
00
Lo
0
9
.
ln
T
c
a
P
a
-1-
2.
PERFORMANCE
2-1
MAXIMUM OUTPUT
The maximum output
the moving parts properly worn-in, when operating with the fully open throttle valve. Therefore, it follows that a new
engine may not develop this maximum output in the beginning, because moving parts are not in a properly worn-in
condition.
2-2
CONTINUOUS RATED OUTPUT
The continuous rated output
most favorable from the point
driving
er requirement
2-3
The maximum torque of an engine is that driving torque
while the engine is developing its max. output. The fuel consumption ratio at max. output is that fuel consumption ratio
an engine while that engine is running at the max. output.
system
MAXIMUM TORQUE
for
of
of
an
engine is such standard power as developed by that engine, after its initial run-in period with all
of
an engine
of
view of engine life and fuel consumption ratio. Therefore, it follows that when designing a
any mechanism, with a model
that mechanism must
and
FUEL CONSUMPTION RATIO AT MAX. OUTPUT
is
such power as developed by that engine when running at an optimum speed
be
kept below the continuous rated output specified.
EC05-2,07-2,
PERFORMANCE CURVE
MODEL
IO,
17
or
25-2
of
the driving shaft at which the engine is driving an external load,
EC05-2D
engine, as a prime mover, the continuous pow-
of
HP
I
for
B
tvoe
2500 3000 3500'
(910) (1090) (1270) (1460)(1640) (1820) (2000)
4000
4500
5000 5500
0.4
0.3
(1.09)
(0.82)
t
-2-
PERFORMANCE CURVE
MODEL EC07-2D
( )
for
B
type
HP
t
4
3
HP
t
2
1
0
PERFORMANCE CURVE
MODEL ECIOD
(
)for
B
tj
(1000) (1200) (1400) (1600)
(1800)
(2000)
-
rpm
-3-
HP
PERFORMANCE CURVE
kg-m
HP
t
PERFORMANCE CURVE
MODEL EC25-2DS
kg-m
-4
-
__c
rpm
3.
5.
4.
5.
6.
7.
8.
9.
FEATURES
COMPACT, LIGHT WEIGHT, HIGH PERFORMANCE
and
LOW
FUEL CONSUMPTION.
TROUBLE FREE
because of simple design and easy
to
handle.
HIGH DURABILITY
engine withstand long severe operation.
TILTED OPERATION
available.
As
a
special feature
of
2-cycle engine, can operate at up
to
about
30'
tilted position just before the
fuel
flooding out
from the air-bent
of
carburetor.
EASY STARTING
Recoil type starter
is
available at option.
LIGHTING
for night operation.
Optional lighting is available by installing special lighting coil.
Lighting
Capacity:
EC05-2,07-2
(1
2V - 16V,
6W)
..
EC10, 17 (6
-
8V,
15W)
EC25-2 (1'2V,
18 - 25W)
VERSATILE APPLICATION
Direct,or reduction type engine with horizontal shaft or vertical shaft are available.
Wide selection
of
driving shaft size and shapes are also available beside standard specification.
Further, consult with dealer for smaller fuel tank, heavy-duty filter element for air cleaner and high-performance
muffler.
The engine can control
to
the desired speed with a
ALL-SPEED GOVERNOR.
It can. be set
for
any desired speed
by
simply moving the control lever.
The
setting speed
is
maintained even under vary-
ing
load.
-
Engine withstand
AGAINST HIGH VIBRATION
environment.
4.
GENERAL DESCRIPTION
4-1
SECTIONAL
VIEW
FUEL TANK CAP
of
ENGINE
of
ENGINE CONSTRUCTION
\
MUFFLER COVER
7
\I
MUFFLER
GOVERNOR
CONTROL LEVER
MODEL EC05-2,07-2
-6-
FUEL
TANK
PISTON PIN
BLOWER
HOUSING
FLYWHEEL
STARTING
PULLEY
NlTlON
COIL
MODEL'EC05-2.07-2
I.
FUEL TANK CAP
r
FUEL TANK
MUFFLER COVER-
CYLINDER
7
\
\
MODEL
-8-
CLEANER
ETOR
'ER
GOVERNOR ARM
ECIO
CYLINDE
CYLINDER
\
f
FUELTANK
MUFFLER
MODEL
-10-
:LEANER
EC17
1
1,
MODEL
EC17
-
11
-
MUFFLER-
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
MODEL EC25-2
-
12-
P.
T
7
FUEL
TANK
SPARK PLUG
CYLINDER HEAD7
.BLOWER HOUSING
-COOLING FAN
. IGNITION COIL
.STARTING PULLEY
,FLYWHEEL
-CRANKSHAFT
MODEL
EC25-2
-13-
4-2
CRANKCASE
All parts related with crankcase assy are aluminium alloy diecastings, which removed all unnecessary excess thickness for
extreme lightness, consist
split-type front crankcase, rear crankcase and crankcase cover (for Model
D)
or reduction cover
of
(for Model B) depending upon the model as per the following table,
Model
-
D
B
D
B
D
B
EC05-2
EC07-2
EC10 for D type Exclusive for
v
D
EC17
B
v
I
EC25-2
Model EClOD,
The rear crankcase forms a governor chamber and provided with crankcase cover. As front, rear crankcase cover hasone ball bearing respective-
ly,
the crankshaft
Model
The rear crankcase forms
fitted.
The
4-3
BASE PLATE
V.
EClOB,
EC17B
reduction cover has two ball bearings, one
D
DS
EC17D,
is
V.
supported by 3 ball bearings.
a
Front Crankcase
for D type
for
D
type
for
D
type Exclusive for
for D type
for
DS
type
EC25-2D.
part of the reduction gear chamber and after installing the reduction gear and governor, reduction cover
DS:
is
Exclusive for
~
Exclusive for
Exclusive for
Exclusive for
~
Exclusive for
Exclusive for
B
D
B
D
B
D
D
B
Exclusive for
Exclusive for
supporting the crankshaft and the other one
D
D
Crankcase Cover Rear Crankcase
Exclusive for
Exclusive for
~-
Exclusive for
D
V
D
/
Exclusive for
Exclusive for
V
D.DS
is
supporting the driving shaft.
Reduction
Exclusive for
Exclusive for
Exclusive for
Cover
B
B
B
is
to
be
The base plate made
4-4
CRANKSHAFT
of
aluminum alloy diecasting is to be attached
and
CONNECTING ROD ASSY.
to
the front and rear crankcase .with
4
bolts.
The crankshaft is separable into the front crankshaft, rear crankshaft and crank pin.
Crankshaft is made
of
forged carbon steel; Crank pin is made
of
chromium-molybdenum steel, hardened and
precision machined.
Connecting rod is a forged chromium-molybdenum piece which is equipped with needle-bearings at both large and
small ends. Both rod ends has an oil grooves
to
deliver lubricant to prevent burning and wearing.
The front, rear crankshafts and the crank pin are assembled together and force fitted in exact alignment with the
special assembling fixture after fitted the needle-bearing and connecting rod on the crank pin. Generally, they can
not disassembled. In case
of
replacing the crankshaft, it is requested
to
replace crankshaft and connecting rod in
assembled manner.
4-5
PISTON
The piston is made of precision-casted heat-resistant aluminum alloy which machined precisely into oval section in order to
prevent from burning and slapping. It is attached to the connecting rod small end by means
of
a piston and a needle bearing.
Near the top of the piston, there are two grooves for compression rings. In order to prevent the rotating the rings during the
operation and damaging the cylinder port, lock-pins are inserted.
-
14-
4-6
DRIVING
SHAFT
(P.T.O.
shaft)
(for
Model B
only)
The driving shaft is made
of
forged carbon steel and reduction gear
is
force-fitted.
4-7 CYLINDER
‘Model
EC05-2, EC07-2
Monoblock cylinder and cylinder head .is made
of
aluminum alloy diecasting and-inside the cylinder is treated with
hard-chromium plating
to
withstand against the wear by reciprocal motion
of
the piston.
Outside fins
of
cylinder-head are arranged to get efficient heat dispersion and provided with threaded hole for mounting a
spark plug on the top.
Inside the cylinder, one each of intake port, exhaust port and two scavenging ports are positioned to get the maximum
engine performance.
-.
Model
ECIO, EC17
The cylinder is made
of
precision-casted wear-resistant cast iron provided with fins for perfect heat dispersion.
Inside the cylinder, one each
of
intake
port,
exhaust port and two scavenging ports are positioned to get the maximum
engine performance.
The cylinder is attached
to
the crankcase with the flange, which positioned lower part of cylinder, by stud-bolts.
*Model
EC25-2
The cylinder
with
the cylinder liner
is
made of aluminium alloy. The cylinder liner
is
made of special cast iron and are
im-
bedded
in
the
aluminium casting as inserts. Inside the cylinder, one each
of
intake port, exhaust port and four scavenging
ports are positioned
to
the maximum engine performance.
4-8
CYLINDER HEAD
(Model
ECIO,
17,25-2
only)
The cylinder head is made
of
heat-conductive aluminum alloy and is provided with the fins, arranged in the direction
of
cooling air to achieve the efficient cooling.
The combusion chamber forms semi- spherical and is provided with threaded hole for mounting a spark-plug on the top.
4-9 GOVERNOR
The centrifugal flyweight type governor assures constantspeed operation at selected speed, irrespective
of
load fluctuations.
(The governor is built-in the crankcase for Model
EC05-2,07-2)
As
to the detail, refer to section
“8.
GOVERNOR”.
4-10 COOLING
The cooling fan which also serves as a flywheel forcily feeds cooling air to the cylinder and cylinder head with the aid
of
blower housing and air buffle.
4-11 IGNITION
The ignition system
is
of
flywheel magneto type with ignition timing set at
23”
before TDC
for
EC05-2, 07-2, 25-2, 18” be-
fore TDC for EC10 and
22”
before TDC for EC 17 respectively.
The flywheel with steel magnet piece revolves outside the coil and generates the electric power
in
the coil. The flywheel
also
equalize the engine revolution and at the same time,
it
serves as a blower, with its impellers on the circumstance, for cooling
the
engine. The igntition coil and the breaker are mounted
in
the crankcase.
As
to
the detail, refer to “Section
7.
MAGNETO”.
-15-
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