Robin EC05-2 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
. MaximumOutput ....................................... 2
2.2
. ContinuousRated Output .................................. 2
2.3 . MaximumTorque andFuelConsumptionRatio at Max . Output ........ 2
3 . FEATURES ................................................ 5
4 . GENERALDESCRIPTION of ENGINECONSTRUCTION ................ 6
4.1
.
4.2 .
4.3 .
4.4 .
. 4.5 .
4.6 .
4.7 .
4.a .
4.9 .
4-1 0 .
4-11 .
4-1 2 .
4-13 .
4.14 .
4-15 .
SectionalView of Engine .................................. 6
Crankcase
............................................. 14
Baseplate
............................................. 14
CrankshaftandConnecting
Rod Assy .......................... 14
Piston
............................................... 14
DrivingShaft (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
ReductionEquipment
(for Model B only) ....................... 16
StartingPulleyorRecoilStarter
.............................
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
. PowerTransmission to Drive Machines ......................... 17
5.6
. Wiring ............................................... 18
6 . DISASSEMBLY and REASSEMBLY. ............................... 20
6.1
. PreparationsandSuggestions ................................ 20
6.2
. Special Tools .......................................... 22
6.3
. Disassembly and ReassemblyProcedure ........................ 24

7 . MAGNETO ................................................ 29
7.1 . Magneto. ..............
; .............................. 29
7.2 . Breaker PointAdjustment
.................................. 29
7.3 . TimingAdjustment
...................................... 30
7.4 . Magneto TroubleShooting
................................. 31
8 . GOVERNOR ............................................... 32
8.1 . Construction and Operation ................................ 32
8.2 . GovernorAdjustment .................................... 34
8.3 . High Speed Adjustment ................................... 36
9 . CARBURETOR ............................................. 38
9.1 . Construction and Operation ................................ 39
9.2 . DisassemblyandReassembly ................................ 39
9.3. Adjustments ........................................... 41
10 . RUN-IN OPERATION of REASSEMBLED ENGINE .................... 42
I1 . TROUBLESHOOTING ........................................ 43
11.1 . Starting Difficulties ...................................... 43
11.2 . Slow-Speed out of order ................................... 44
11.3 . Overheatingand Knocking ................................. 44
11.4 . Power Drop ........................................... 45
11 .5 . Excessive FuelConsumption ................................ 45
11.6
. Engine Hunting ......................................... 45
11.7 . OtherComplaints ....................................... 45
12
. CHECKS and CORRECTIONS ................................... 46
13 . MAINTENANCE and STORING .................................. 53
0
13.1 . Daily ChecksandMaintenance .............................. 53
13.2 . Every 50Hours (10 Day) ChecksandMaintenance ................. 53
13.4 . Every 500-600 Hours(Semiannual) ChecksandMaintenance ......... 53
13.6 . Preparation for LongAbeyance .............................. 54
13.3 . Every 100-200 Hours (Monthly) ChecksandMaintenance ........... 53
13.5 . Every 1000 Hours (Yearly)ChecksandMaintenance ............... 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 of an engine is such standard power as developed by that engine, after its initial run-in period withall
the movingparts properlyworn-in,whenoperatingwith thefullyopenthrottle valve. Therefore,itfollowsthata new
engine may notdevelopthismaximum output in the beginning,becausemovingpartsarenot inaproperlyworn-in
condition.
2-2 CONTINUOUSRATEDOUTPUT
Thecontinuous rated output of anengine is suchpower asdevelopedby that enginewhenrunning at an optimum speed
most favorable from the point
of viewof engine life and fuel consumption ratio. Therefore, it follows that when designing a
driving system for anymechanism, with a model EC05-2,07-2, IO, 17 or 25-2 engine, as a prime mover, the continuous pow-
errequirement
of that mechanism must be kept below the continuous rated outputspecified.
2-3 MAXIMUMTORQUE and FUELCONSUMPTIONRATIOATMAX.OUTPUT
The maximum torque of an engine is that driving torque of the driving shaft at which the engine is driving an external load,
while the engine is developing its max. output. The fuel consumption ratio at max. output is that fuel consumption ratio
of
an engine while that engine is running at the max. output.
PERFORMANCE CURVE
MODEL EC05-2D
I for B tvoe
HP
2500 3000 3500' 4000 4500 5000 5500
(910) (1090) (1270) (1460)(1640) (1820) (2000)
0.4 (1.09)
0.3 (0.82) t
-2-

PERFORMANCECURVE
MODEL EC07-2D
( ) for B type
HP
t
4
3
HP
t 2
1
0
PERFORMANCE CURVE
MODELECIOD
( )for B tj
(1000)(1200)(1400)(1600) (1800) (2000)
- rpm
-3-

HP
HP
t
PERFORMANCECURVE
kg-m
PERFORMANCECURVE
MODEL EC25-2DS
kg-m
-4 -
__c rpm

3.
5.
4.
5.
6.
*- .
7.
8.
9.
FEATURES
COMPACT, LIGHT WEIGHT, HIGH PERFORMANCE and LOW FUELCONSUMPTION.
TROUBLE FREE
because of simpledesign 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 lightingis 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 orvertical shaft are available.
Wide selection
of driving shaft size and shapes are also available beside standard specification.
Further,consultwith dealer for smallerfuel tank,heavy-dutyfilterelementfor air cleanerandhigh-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 controllever. The setting speed is maintained even under vary-
ing load. -
Engine withstand AGAINST HIGH VIBRATION environment.

4. GENERALDESCRIPTION of ENGINECONSTRUCTION
4-1 SECTIONAL VIEW of ENGINE
FUEL TANK CAP
\
MUFFLERCOVER 7
\I
MUFFLER
GOVERNOR
CONTROLLEVER
MODEL EC05-2,07-2
-6-

FUEL TANK
PISTON PIN
BLOWER
HOUSING
FLYWHEEL
STARTING
PULLEY
NlTlON COIL
MODEL'EC05-2.07-2
I.

CYLINDER
7
\
MUFFLER COVER- \
FUEL TANK CAP
r FUEL TANK
GOVERNORARM
MODEL ECIO
CLEANER
ETOR
'ER
-8-

CYLINDE
CYLINDER
\
MUFFLER
f FUELTANK
MODEL EC17
:LEANER
-10-

1 1,
MODEL EC17
- 11 -

00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
MUFFLER-
MODELEC25-2
- 12-

P. T
7 FUEL TANK
SPARKPLUG
CYLINDER HEAD7
.BLOWERHOUSING
-COOLINGFAN
. IGNITION COIL
.STARTING PULLEY
,FLYWHEEL
-CRANKSHAFT
MODEL EC25-2
-13-

4-2 CRANKCASE
All partsrelated with crankcase assy arealuminium alloy diecastings,which removed all unnecessary excess thickness for
extreme lightness, consist
of split-type front crankcase, rear crankcase and crankcasecover (for Model D) or reduction cover
(for Model B) depending upon the modelas per the following table,
Model Reduction
Cover
Crankcase Cover Rear Crankcase
Front Crankcase
EC05-2
D
B
B
Exclusive for D
D
Exclusivefor B Exclusivefor B
for D type
~
EC07-2 for
D type Exclusive for
B Exclusivefor B
D
Exclusivefor D Exclusive for D
-
EC10 for D type Exclusive for B B
~
v
Exclusive for D Exclusive for D
D
Exclusive for D Exclusive for V
~-
EC17 for
D type Exclusive for B / Exclusivefor B
B
v Exclusive for D Exclusivefor V
I EC25-2
D
for DS type
DS
for D type Exclusivefor
D Exclusivefor D.DS
Model EClOD, V. EC17D, V. EC25-2D. DS:
The rear crankcaseformsa governor chamberand provided with crankcase cover.As front, rear crankcase coverhasoneballbearing respective-
ly, thecrankshaft is supported by 3 ball bearings.
Model
EClOB, EC17B
The rearcrankcase forms
a part of the reduction gear chamber and after installing the reduction gear and governor, reduction cover is to be
fitted. The reductioncover has two ball bearings, one is supporting the crankshaft and the other one is supporting the driving shaft.
4-3 BASE PLATE
Thebaseplatemade of aluminumalloydiecasting is to beattached to thefrontandrearcrankcase.with 4 bolts.
4-4 CRANKSHAFT and CONNECTINGROD ASSY.
Thecrankshaft is separable intothefrontcrankshaft,rearcrankshaftandcrankpin.
Crankshaftismade
of forgedcarbon steel;Crankpin is made of chromium-molybdenumsteel,hardenedand
precision machined.
Connectingrod is aforged chromium-molybdenumpiecewhich is equippedwith needle-bearings at both large and
small ends.Bothrodends hasan oilgrooves
to deliver lubricant to preventburningandwearing.
Thefront, rear crankshafts and the crankpinareassembledtogetherandforcefittedinexactalignmentwiththe
specialassemblingfixtureafterfittedtheneedle-bearingandconnectingrod onthe crankpin.Generally, they can
notdisassembled.In case
of replacing thecrankshaft,it is requested to replacecrankshaftandconnectingrodin
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 rodsmall end by means
of a piston and a needle bearing.
Near the top of the piston, there are two grooves for compressionrings. In order to prevent the rotating therings during the
operation and damagingthe 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
Monoblockcylinderandcylinderhead .is made of aluminum alloy diecastingand-insidethecylinder is treatedwith
hard-chromium plating
to withstand against the wear by reciprocal motion of the piston.
Outsidefins
of cylinder-headarearranged to getefficientheatdispersionand providedwiththreaded holeformountinga
spark plug on the top.
Inside thecylinder,oneeachofintakeport,exhaustport and two scavenging portsarepositionedto get themaximum
engine performance.
-. Model ECIO,EC17
The cylinder is made of precision-casted wear-resistant cast iron provided with fins for perfect heat dispersion.
Inside thecylinder,oneeach
of intake port, exhaustportandtwo scavenging portsarepositioned to get themaximum
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)
Thecylinderhead is made of heat-conductivealuminumalloyand is providedwith the fins,arrangedinthedirection of
cooling air to achieve the efficient cooling.
The combusion chamber forms semi- spherical andis 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”.
4-10COOLING
Thecooling fanwhich also serves asa flywheelforcilyfeeds cooling air to the cylinderandcylinderheadwith 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 piecerevolves outside thecoil 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 impellerson thecircumstance, for cooling
the engine. The igntition coil andthebreaker are mounted in the crankcase.
As to the detail, refer to “Section 7. MAGNETO”.
-15-

4-12 CARBURETOR
A horizontaldraftfloattypecarburetor is employed.Itssettinghasbeencarefuilydeterminedafterthoroughtesting to
achieve best starting, accelerating, fuel consumption, output and performances.
As to the detail suchas construction, refer to section “9. CARBURETOR”.
4-13 AIRCLEANER
Air cleanerused inthismodel is asemi-wet type cleaner,whichcontainsoilsoakedfilteringelement thattraps all
dustparticlesfloating intheintake air
so that cleanair is supplied tothecarburetor.
4-14 REDUCTIONEQUIPMENT (For Model B only)
With the Model B engine, rear crankcase and reduction cover forms the reduction chamber, and the revolution of crankshaft
reduced to 1/2.7for Model EC05-2, 07-2, to 1/25 for ModelEClOandEC17byreduction-gearandpinion, andthenits
transmitted to
P.T.O. shaft. Governer is also equipped with reduction chamber and lubricated by same lubricant.
Use SAE
30 lubricant. (for EClO, 17)
4-15 STARTINGPULLEY or RECOILSTARTER
Optionalrecoilstarter is available for Model D and B. Model V is equippedwith recoil starter.
Starting pulley
of Model D and B are identified according to the direction of engine rotation.
By removing the recoil starter, starting theengine can be made by starting pulley.
- 16-