Robin EY08D User manual

ROBIN AMERICA, INC.
ROBIN TO WISCONSIN ROBIN
ENGINE MODEL CROSS REFERENCE LIST
ROBIN
EY08
EY15
EY15V
EY20
EY2OV
EY23
EY28
EY3
5
EY40 -
EY45V
EY2
1
EY44
EY18-3
EY25
EY27
EH11
EH12
EH15
EH17
EH21
EH25
EH30
EH30V
EH34
EH34V
EH43V
EC13V
DY23
DY27
DY30
DY3
5
DY41
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 1-43OV
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 Maximum Output ........ 2
3 . FEATURES .................................................. 3
4 . GENERALDESCRIPTION of ENGINECONSTRUCTION ................... 4
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
Cylinder. Crankcase ........................................ 4
Main BearingCover ......................................... 4
Crankshaft .............................................. 4
Connecting Rod andPiston ................................... 5
Camshaft ............................................... 5
Valve Arrangement ......................................... 5
Cylinder Head ............................................ 6
Governor ............................................... 6
Cooling ................................................. 6
Lubrication .............................................. 6
Ignition
................................................ 7
Carburetor .............................................. 7
Air Cleaner .............................................. 7
Sectional View of Engine ..................................... 8
5 . DISASSEMBLY and REASSEMBLY .................................. 10
5- 1 PreparationandSuggestion .................................... 10
5-2 SpecialTools ............................................. 10
5-3 How To Disassemble ........................................ 12
5-4 How To Reassemble ........................................ 16
6 . MAGNETO ................................................... 24
6-1
Magneto ................................................ 24
6-2
Magneto Trouble Shooting .................................... 24
7 . GOVERNORADJUSTMENT ....................................... 25
8 . CARBURETOR ................................................ 26
8-1 Operation and Construction ................................... 26
8-2 DisassemblyandReassembly
.................................. 27

Section Title Page
9 . BREAK-INOPERATION Of REASSEMBLEDENGINE ..................... 28
10 . ROBINSOLIDSTATEIGNITIONENGINE(U.T.C.I.) ..................... 29
10-1 Features ................................................ 29
10-2
Basic Principle of U.T.C. I ..................................... 29
I1 . ROBINOIL SENSOR SYSTEM(FLOAT SYSTEM) ....................... 30
11-1 Features ................................................ 30
11 -2 Basic Principle ............................................ 30
11 -3 CheckingProcedures ........................................ 32
11 -4 Precautions .............................................. 33
11-5
Wiring ................................................. 33
12 . TROUBLESHOOTING ........................................... 34
12-
1 Starting Difficulties ......................................... 34
12-2
EngineMisfires ............................................ 35
12-4
EngineOverheat ........................................... 35
12-3
Enginestops ............................................. 35
12-5 Engine Knocks ............................................ 36
12-6
Engine Backfiresthrough Carburetor ............................. 36
13 . INSTALLATION ............................................... 37
13-1
Installing ................................................ 37
13-2
Ventilation .............................................. 37
13-3
Exhaust Gas Discharge ....................................... 37
13-4
Power Transmissionto Driven Machines ........................... 37
13-5 Wiring ................................................. 38
14 . CHECKS and CORRECTIONS ...................................... 39
15 . TABLE of CORRECTIONSTANDARDS ............................... 40
16 . MAINTENANCE and STORING ..................................... 45
16-1
Daily Checksand Maintenance ................................. 45
16-2
Every 20 Hours Checksand Maintenance .......................... 45
16-3
Every 50 Hours (IO days) Checksand Maintenance .................... 45
16-4 Every 100 . 200 Hours (Monthly)Checksand Maintenance .............. 45
16-5
Every 500 . 600 Hours (Semiannual)Checksand Maintenance ............ 46
16-6 Every 1000 Hours (Yearly) Checks andMaintenance ................... 46
16-7 Preparationfor LongAbeyance ................................. 46

1. SPEC1 FICATIOMS
Model EY08BNEY08D
Air-Cooled, 4-Cycle, Vertical, Single Cylinder Gasoline Engine
Bore x Stroke (in)
77.6 cc (4.74 cu. in)Piston Displacement(cu. in)
51 mm 'x 38 mm (2.01" x 1.50")
Compression Ratio 6.5
Continuous RatedOutput (HP/rpm) 1.0/3000
1.4/3600
1 .O? 1500
1.4/1800
Max. Output (HP/rpm)
0.72/16000.36/3200
Max. Torque (kg-m/rpm)
2.0/2
1 00
2.0/4200
Direction of Rotation 1 Counterclockwise Facingto P.T.O. Shaft Clockwise Facing to P.T.O. Shaft
Cooling System
I ForcedAir Cooling
~
Lubrication SplashingType
Lubricant Automobile OilClass
SC
~~
Carburetor Horizontal Draft, Float Type
~~
Fuel
320
at continuous rated output operationFuel Consumption Ratio (gr/Hp-h)
Non-leadedAutomobile Gasoline
Fuel Feed
I
Gravity Type
Fuel
Tank Capacity
I
Approx. 1.5 liter (0.40 U.S. gal.)
Reduction Ratio
I
-
1 /2
Speed Governor
8.5 kg (18.7 Ibs.)
8 kg (17.6 Ibs.)
DryWeight (Ibs.)
Recoil Starter
Starting System
-
LightingCapacity (V-W)
NGK-BM4A (S.T.D.)
Spark Plug
Flywheel MagnetoType (Solid
State Ignition) IgnitionSystem
Centrifugal Flyweight Type
Length (in)
326 mm (12.83")
Height
(in)
264 mm (10.39")
Width (in)
Dimensions
252 mrn (9.92")
-1 -

2. PERFORMANCE
2-1 MAXIMUM OUTPUT
The maximum output ofan engine is such standard poweras developed by the engine, after itsinitial break-in
period with all themoving parts properlyworn in,when operating with a fully open throttlevalve, Therefore,
a new engine may not develop the maximum output in the beginning because the moving parts are not in a
properly worn-in condition.
2-2 CONTINUOUSRATEDOUTPUT
The continuous rated output of an engine is such power as developed by that engine when running continu-
ously at an optimum speed, and mostfavorable from theviewpoint of engine life and fuel consumption ratio,
with the governor in operation. Itis suggested, therefore, that when designing a driving system
for any mech-
anism, with this engine
as prime mover, the continuous power requirement of that mechanism be kept below
the continuousrated output specified.
2-3 MAXIMUM TORQUE and FUELCONSUMPTION RATIO at MAXIMUM OUTPUT
These mean the maximum torque of the output shaft and fuel consumption ratio at the maxiumum output
of
an engine.
HP
L
W
0
a
3’
L
0
I
PERFORMANCE CURVE
MODEL EY08D
( ) for BN type
0.45
0.40
0.35
0.30
2.5
2.0
1.5
1 .o
0.5
2000 3000 4000
(1 000) (1 500) (2000)
Revolution
- r.p.m.
(0.9) kg-rn
-2-

3. FEATURES
1. Compact, lightweight, durable, powerful4cycle air cooled engine embodying ingeniousdesign techniques
and skilful workmanship.
2. Simpleconstruction,smartappearance,maximum easiness of start owing toautomatic decompression
device
3. Pointless Solid State ignition systemis newldy adopted for preventing poorigniting.
4. Reliable prime mover for varietyof purposes with smooth speed controlrby a governor under varying load
conditions.
5. Economical because fuel consumption is very low
-3-

4. GENERALDESCRIPTION of ENGINECONSTRUCTION
4-1 CYLINDER,CRANKCASE
Thecylinderand crankcaseare single piece alumi-
num die casting. The cylinder liner, made ofspecial
cast iron, is built into the alminumcasting. The
in-
takeandexhaustports arelocated onone side of
the cylinder, and are also insertedinto thecasting.
The crankcase is separable on the output shaft side,
where the main bearing cover
is attached to it.
(See Fig.
1 .)
Fig. 1
4-2 MAIN BEARING COVER
The main bearing cover made of aluminum die castingis built onto the output shaftside of the crankcase so
that theinside of theengine can readily be checkedbysimply removing the cover. Itis provided with a flange
and boss for directly mounting machines,
such as generators and pumps.
Two oil gauges also serving
as oil filler caps can be mounted. (See Fig. 2 and Fig. 3.)
Oi I
Ring for Centering
!ID Oil Gauge
Fig. 2
4-3 CRANKSHAFT
The crankshaft is forged ofcarbon steel,and the
crankpin
is induction-hardened.Ithas acrank gear
pressure-fitted on the output end.(See
Fig. 4.)
Fig. 3
~~
Induction Hardening
(Portion ofCrankpin)
\
CrankGear (Pressure-fit)
Fig. 4
-4-

The connecting rodis made of aluminum die casting,
whichitself serves as bearings at both the large and
small ends. The large end cap and the oil scraper are
moulded in a unit forsplashing the lubricatingoil.
The pistonis cast
of aluminum alloy, and hasgrooves
for receiving two compression rings and one
oil ring.
(See Fig.
5.)
4-4 CONNECTINGROD and PISTON
4-5 CAMSHAFT
In the EY08Dengine, the camshaftis integrally built
with a cam gear of special cast iron, and has intake
and exhaust cams. Also the camshaft has aluminum
plainbearings attached to both ends.
(No ball bear-
ing is used.) (See Fig.
6.)
In the EY08BN engine,the camshaft is forged of car-
bon steeland is providedwithaforce-fit cam gear.
@ It serves also as the driving shaft, beingdriven at half
the crankshaftspeed,anda ball bearing is used at
the P.T.O. shaft side.
4-6 VALVEARRANGEMENT
The intake valveis locatedupstream of the cooling
air with the result that the carburetor is intensively
cooled.(See Fig.
7.)
Top Ring
Second Ring
Oil Ring
Connecting
Rod
Oil Scraper
\I
L
Fig. 5
:
Fig. 6
Direction of
Cooling Wind
Fig. 7
-5-

4-7 CYLINDERHEAD
The cylinderhead is analuminumdie casting, and
forms aRicardotypecombustionchamber with
ample area for high combustion efficiency.
(See
Fig. 8.)
4-8 GOVERNOR
Thegovernor is acentrifugalflyweight type which
permitsconstantoperation-atthe selected speed
against load variations.Govrnor gear is installed on
the bearing cover without fail, and
it engages with
the cam gear after reassembling. (See Fig.
9.)
I
Fig. 8
Main Be
!mor Sleeve
Spacer
Q
-
Governor Gear Complete
Fig. 9
4-9 COOLING
The cooling fan serving also as a flywheel coolsthe cylinderand the cylinder head by forced air cooling. Cyl-
inder baffles
and head cover areprovided forguiding the cooling air.
4-10 LUBRICATION
Therotatingand sliding partsare being lubricated
by scooping
and splashing the oil in the crankcase
with the
oil scraper. (See Fig. 10.)
Fig. 10
-6-