Robin EY15 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 ...........................................
2 . PERFORMANCE ...........................................
2- 1 MaximumOutput .......................................
2-2 ContinuousRated Output .................................
2-3 MaximumTorque .......................................
3 . FEATURES ...............................................
4 . GENERALDESCRIPTION of ENGINECONSTRUCTION ...............
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-1
1
4-12
4-
13
4-14
Cylinder. Crankcase .....................................
MainBearingCover ......................................
Crankshaft ...........................................
ConnectingRodandPiston ................................
Camshaft ............................................
ValveArrangement ......................................
CylinderHead .........................................
Governor ............................................
Cooling ..............................................
Lubrication ...........................................
Ignition .............................................
Carburetor ...........................................
Air Cleaner ...........................................
Sectional View of Engine ..................................
5 . DISASSEMBLY and REASSEMBLY ...............................
5-1 PreparationandSuggestion .................................
5-2 Special Tools ..........................................
5-3 Haw To Disassemble .....................................
5-4 How To Reassemble .....................................
6 . MAGNETO ...............................................
6-1 Magneto .............................................
6-2 Breaker PointAdjustment .................................
6-3 TimingAdjustment for EY15. EY20 PointTypeIgnition System ........
6-4 MagnetoTrouble Shooting .................................
6-5 Solid State Ignition ......................................
7. GOVERNORADJUSTMENT ...................................
8 . CARBURETOR ............................................
8- 1 OperationandConstruation ................................
8-2 DisassemblyandReassembly ...............................
9 . BREAK-IN OPERATION Of REASSEMBLEDENGINE ................
1
3
4
4
4
5
5
6
6
7
7
8
8
8
9
9
10
18
18
18
20
27
37
37
37
38
39
39
40
42
42
43
45

Section Title pese
10 . ROBINSOLIDSTATEIGNITIONENGINE (T.I.C. and P.I.T.) ............ 46
10-1
Features ............................................. 46
10-2
Basic Theoryof T . I.C. ................................... 46
10-3
Basic Theoryof P . I.T. ................................... 46
11 . TROUBLESHOOTING ....................................... 47
11
. 1 StartingDifficulties ...................................... 47
11
-2 EngineMisfires ......................................... 48
1 1-3 EngineStops .......................................... 48
11
-4 EngineOverheats ....................................... 48
11 -6 EngineBackfires through Carburetor .......................... 49
12 . INSTALLATION ............................................ 50
12-1
Installing ............................................. 50
12-2 Ventilation ........................................... 50
12-3
Exhaust Gas Discharge .................................... 50
12-4
PowerTransmission to Driven Machines ........................ 50
12-5
Wiring .............................................. 51
13 . ELECTRICSTARTINGMOTOR (Option) .......................... 53
13- 1 Specifications ......................................... 53
13-2
Operation ............................................ 53
11-5
EngineKnocks ......................................... 49
14 . RECOILSTARTERDISASSEMBLY and REASSEMBLY ................ 54
14-1
How To Disassemble (TypeD) .............................. 54
14-2
How To Reassemble (Type D) ............................... 55
14-3
Check Itemsafter Reassembly ............................... 57
14-4
How ToDo inSuch Cases! ................................. 57
15 . CHECKS and CORRECTIONS ................................... 58
16 . TABLE of CORRECTIONSTANDARDS ........................... 59
17 . MAINTENANCE and STORING .................................
17-1 Daily Checksand Maintenance ..............................
17-2 Every 20 Hours ChecksandMaintenance .......................
17-3 Every 50 Hours ChecksandMaintenance .......................
17-4 Every 100 - 200 Hours (Monthly)ChecksandMaintenance ...........
17-5 Every 500 - 600 Hours(Semiannual)Checksand Maintenance .........
17-6 Every 1000 Hours (Yearly)ChecksandMaintenance ................
17- 7 Preparation for Long Abeyance ..............................
65
65
65
65
65
66
66
66
.

2. PERFORMANCE
2-1 MAXIMUM OUTPUT
The maximum ouput of anengine is such standard power asdeveloped by the engine, after its initial breakin period with all
the moving parts properly worn in, when operating with a fully openthrottlevalve. 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 CONTINUOUS RATED OUTPUT
The continuous rated output of an engine is sudrpoweras developed by that engine when running continuously at an opti-
mum
speed, and most favorable from the viewpoint of engine life and fuel consumption ratio, with the governor in opera-
tion. It
is suggested, therefore, that whendesigning a driving system for any mechanism, with this engine as prime mover,
the continuous power requirement
of that mechanism be kept below the continuous rated outputspecified.
23 MAXIMUM TORQUE
These mean the maximum torque of the outputshaft and fuel consumption ratio at the maximum output of an engine.
PERFORMANCE CURVES
MODEL EY15D, 15B
( 1 for B type
4
Ma;. Torque ~ 0.7
-
I I 7 0.6
HP
tii
I\ I I I I I I
I
2000 3000 4000
(1 000) (1 500) (20001
r.p.m.
Revolution
kg-m
-2-

PERFORMANCE CURVES
MODEL EYZOD
5
Max. Toraue 1 .o
4
3
HP
L.
B
22
w
r
1
2000 3000 4000
Revolution
r.p.m.
2000
(1 000)
PERFORMANCECURVES
MODEL
EY28D, 288
I ) for B tvm
3000
( 15001
Revolution
r.p.rn.
4000
I20001
3. FEATURES
1. Compact,lightweight,durable,powerful4-cycleair-cooledengineembodyingingeniousdesign techques and skilful
workmanship.
2. Simple construction, smart appearance, maximumeasiness of start owing to automaticdecompression device
3. Pointless Solid State ignition systemis newly adopted for preventing poor igniting as option.
4. Reliable prime moverfor variety of purposes withsmooth speed control by agovernor under varying loadconditions.
5. Economical because fuel consumption is very low.
6. Great ve:satility in installation through a 360" belt extension possibihty and a two-side oil fill and drain arrangement.
-3-

4. GENERALDESCRIPTION of ENGINECONSTRUCTION
4-1 CYLINDER, CRANKCASE
Thecylinderandcrankcaseare single piece aluminum die
casting. Thecyhder liner, made of special cast
iron, is built
into the alminum casting. The intake
and exhaust ports are
locatedonone side of the cyhder, and are also inserted
into the casting.
Thecrankcase
is separable on the output shaftside, where
the main bearing cover
is attached to it.
(See Fig.
1 .)
4-2 MAIN BEARING COVER Fig. 1
The main bearing cover made of aluminum die castingis built onto the output shaftside of the crankcase so that theinside
of the engine can readily be checked by simplyremoving the cover. It is provided with a flange and boss for directly mount-
ing machmes, such as generators and pumps.
Two oil gaugesalso servingas oil filler caps canbe mounted. (See Fig. 2 and Fig. 3.)
The EY 15B engine has 2 chainguides and abuilt-inshelterplate to prevent oil from being stirred by the governor gear
(See
Fig. 4.)
Ring for Centering
/
Oil Gauge Oil Gauge
Fig. 2
I
Governor Gear
Fig. 3
Chain Guide
- Shelter Plate
1
Fig. 4 (E Y 15B)
-4-

4-3 CRANKSHAFT
The crankshaft is forged of carbon steel, and the crankpin is induction-hardened. It has a crank gear premred-fitted on the
output end.
(See Fig. 5.).
"he EY 15B type has abuilt-in drive sprocket.(See Fig. 6.)
Induction Hardening
(Portion
of Crankpin)
Crank Gear
(Pressure-Fit) Drive Sprocket
-
Fig. 5
Fig. 6 (E Y 158)
4-4 CONNECTING ROD, PISTON and PISTON RING
The connecting rod is forged of aluminumalloy, which it-
self serves as bearings at both the large and
small ends. The
large end
has a built-in oil scraper for splashing thelubri-
cating
oil.
The piston is cast of aluminumalloy,andhas grooves for
receiving two compression
rings and one oil ring.
(See
Fig. 7.)
PISTON RINGS for EY28 ENGINE
Thispiston ringsare made of specialcastiron and the
shape
of the top ring is barrelface, that ofsecond ring is
taper under cut; and the
oil ring has cutter expander.These
rings are very mucheffectivefordecreasingengine
oil
consumption.
Connecting Rod
Rod Lock Washer
Oil Scraper
1
Fig. 7
-5-

4-5 CAMSHAFT
In the D type, the camshaft is integrally built with a cam gear of special cast iron, and has intake and exhaust cams. Also
the camshaft has aluminum
plain bearingsattached to bothends. (No ball bearing isused.) (See Fig. 8.)
In the B type, the camshaft is made of carbon steel, and EYlSB type hasa pressured-fitted cam gear and a driven sproket.
(See Fig.
9.) The camshaft functions also as an output shaft, and is driven by 1/2 rotation of the crankshaft, Ball bearings
are used
in the output shaftside.
J
Fig. 8
4-6 VALVE ARRANGEMENT
The exhaust vahe is located upstream of thecoolingair with
the result thattheexhaust valve
is intensiveiy cooled for
improved engine durability. The innerside of the valve head
is reinforced with hard alloy fusedto it for added durability.
(SeeFig.
10.)
Driven Sprocket
(Pressure-Fit)
Cam Gear
Fig. 9 (E Y 156)
I Exhaust Valve
Direction of Cooling Wind
Fig. 70
-6-

4-7 CYLINDER HEAD
The cylinder head is an aluminum die casting, and forms a
Ricardo type combustion.chamber with amplearea for high
combustioneffeciency.Thesparkplug
is tiltedforeasy
mounting
of the fuel tank.
(See Fig.
11.1
Fig. 1 1
4-8 GOVERNOR
The governor is a centrifugal flyweight type which permits
constant operation at the selected speed against load varia-
tions. Governor gear
is installed on the bearing cover with-
out fail, and
it engages with the cam gear afterreassembling.
(See
Fig. 12.)
/
Main BearingCover
Governor Sleeve
1 Governor Gear Complete
Fig. 12
-7-

4-9 COOLING
The cooling fan serving also as a flywheel cools the cyhderand cylinder head by forced air cooling. Cylinder baffles and
head cover are provided forguiding the coohg air.
4-10 LUBRICATION
The rotating andsliding parts are being lubricatedby scoop-
ing and splashing the oil in the crankcase withthe oil scraper
attached
to the connecting rod.
(SeeFjg. 13.)
Fig. 13
4-1 1 IGNITION
The ignition system is a flywheel magneto type with ignition timing set at 23" before TDC. The magneto is composed of a
flywheel and ignition
coil. The flywheel serving also as a fan is mounted directly on the crankshaft, and the ignition coil in
the crankcase.
(For further detds,refer to Section on the Magneto.)(See Fig. 14 and Fig. 15.)
(BREAKER POINTIGNTIONTYPE)
(SOLID STATE IGNITION TYPE)
Ignition Coil Ea\?
Fig. 14
-8-
Fig. 15

D
4-12 CARBURETOR
A horizontal draft carburetoris employed. It has been care-
fully set after thorough tests to assure satisfactory start up,
acceleration, fuel consumption, output performance etc.
For construction and order details,refer to the Section on
Carburetor Construction, Disassembly
and Reassembly.
(See
Fig. i6.)
4-13 AIR CLEANER
The air cleaner of thestandardtype engine is anoblong
type using asponge element.
(A cyclone typesemi-wet
double element air cleaneris optionally available.)
m
(See Fig. 17.)
Fig. 16
Air Cleaner for
Standard Type Cyclone Type
(Option)
Mushroom Cyclone Type
(Option)
Fig. 17
-9-

4-14 SECTIONAL VIEW OF ENGINE
4-14-1 MODEL EY15D
Cylinder Head
Blower Housing
Ignition Coil
Piston Pin
Flywheel
(CoolingFan)
Starting Pulley
Recoil Starter Governor
MODEL EY15D
(BREAKERPOINTIGNITIONTYPE)
- 10 -

Piston
Stop Button
Connecting
Rod
\
I
i /-Speed Control Lever
Air Cleaner
'Carburetor
.Muffler
.Intakeand
Exhaust Valve
Tappet
Oil Scraper- 1 Camshaft
MODEL EY15D
- 11 -

4-14-2 MODEL EY15B
Cvlinder Head
BlowerHousing
Ignition
Coil
PistonPin
Flywheel
(CoolingFan)
Starting Pulley
Recoil Starter --/ L
MODEL EY15B
(SOLIDSTATE IGNITION TYPE)
SparkPlugCap
SparkPlug
PistonRing
Crankcase
ChainGuide
Crankshaft
MainBearingCover
Governor
- 12 -

Fuel Tank 1
I
\r Speed Control Lever
Piston
Stop Button
ConnectingRod
Oil Scraper
Air Cleaner
Carburetor
Muff I er
Intake and
Exhaust Valve
Tappet
Chain
MODEL EY15B
- 13 -

4-14-3 MODEL EY20D
Recoil Starter Governor
MODEL EYPOD
(BREAKER POINT IGNITION TYPE)
Cover
- 14 -

Piston
Stop Button
Connecting
Rod
Oil Scraper
Camshaft
Lever
Speed Control
1 \-
Air Cleaner
Carburetor
.Muffler
Intake and
Exhaust Valve
\“Tappet
MODEL EY20D
- 15 -

4-14-4 MODEL EY28
Flywhe
,Spark Plug Cap
Spark Plug
Piston Ring
Crankcase
lg Cover
MODEL EY28
(SOLID STATEIGNITIONTYPE)
-Governor
- 16 -