Robin EY14, EY23, EY18-3, EY25-2, EY27-2 Service Manual

ROBIN

ENGINE

ROBIN

MODEL CROSS

AMERICA,

TO

WISCONSIN

mc.

ROBIN

REFERENCE

LIST

ROBIN

EY08
EYl5

15V

EY

EY20

EY2OV
EY23
EY28
EY35
EY40
EY45V

1

EY2
EY44
EY 18-3

EY25

EY27

-

WISCONSIN

W1-080
W1-145
W1-145V
w1-185

W1-185V

Wl-230

W

1-280

W1-340

W1-390

W1-450V
EY21W
EY44W

18-3W

EY

EY25W

EY27W

ROBIN

EHl 1

EH12

EH15

EH17

EH21
EH25
EH30
EH3OV
EH34
EH34V
EH43V

EC13V

DY23

DY27

DY30
DY35

DY4

1

TWO

CYCLE

WOl-115
WOl-120
WO1-150
WO1-170
wo1-210
WO1-250

WO

1-300

WO

1

-300v

WO

1-340

WO

1 -340V

WO

1 -430V

WT1-125V

WRD

WRD
WRD

WRD1-350

wRDl-410

1-230
1-270
1-300

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

................................................

4

4

.

GENERAL DESCRIPTION

of

ENGINE CONSTRUCTION

...............

4

4-1

Cylinder Crankcase

......................................

4

4-2 Main Bearing Cover

.......................................

4

4-3 Crankshaft

...........................................

4

4-5 Camshaft

.............................................

4

4-7 Cylinder Head

..........................................

5

4-8 Governor

.............................................

5

4-9 Cooling

...............................................

5

4-10

Lubrication

............................................

5

4-11 Ignition

..............................................

5

4-13 Air Cleaner

............................................

5

4-14 Sectional View

of

Engine

...................................

6

4.4 Connecting Rod and Piston

.................................

4

4-6 Valve Arrangement

.......................................

5

4-12 Carburetor

............................................

5

5.lNSTALLATlON

............................................

14

5-1 Installing

..............................................

14

5-2 Ventilation

............................................

14

5-3 Exhaust Gas Evacuation

....................................

14

5-4

Fuel System

...........................................

14

5-5 Power Transmission to Driven Machines

.........................

14

5-6

Wiring

.............................................

15

6

.

DISASSEMBLY

and

REASSEMBLY

..............................

21

6-1 Preparation and Suggestions

.................................

21

6-2 Special Tools

...........................................

21

6-3

Disassembly and Ressembly Procedures

.........................

22

7.MAGNETO

................................................

29

7-1 Magneto

7-2

Breaker Point Adjustment

7-3

Timing

74 Magneto Trouble Shooting

8

.

GOVERNOR ADJUSTMENT

9.

CARBURETOR

9-1

Operation and Construction

9-2

Disassembly

9-3 Adjustment

10

.

RUN-IN OPERATION

11

.

TROUBLE SHOOTtNG

11

-1 Starting Difficulties

11

-2

Engine Misses

11-3

Engine Stops

114

Engine Overheats

11-5

Engine Knocks

11-6 Engine Backfires Through Carburetor

.............................................

Adjustment

.......................................

.............................................

and

Reassembly

............................................

of

REASSEMBLED ENGINE

.......................................

.......................................

...........................................

...........................................

........................................

.........................................

..................................

...................................

...................................

.................................

................................

...................

...........................

29
29

30

31

32

33

33

34

36

37

38

38
39
39
39

40

40

12

.

CHECKS AND CORRECTIONS

13 . CORRECTION TABLE

14

.

MAINTENANCE

14-1 Daily Checks and maintenance (Every 8 Hours)

14-2

Every

14-3 Every

14-4

Every
14-5 Every 500
14-6 Every 1000 Hours (Yearly) Checks

14-7

Preparation for Long-Term Storage

20

50

100

and

Hours

Hours

.
.

.......................................

STORING

Checks and Maintenance

(10

Day)

200 Hours (Monthly) Checks
600 Hours (Semianual) Checks and Maintenance

.................................

.................................

Checks and Maintenance

and

....................

........................

..................

and

Maintenance

............

...........

Maintenance

.................

............................

41

42

48

48

48

48
48
49
49

49

1.

SPEC1

FICATIONS

[

N

m

p

52

0

n

0"

V

t

1

c

t

I

I

i

-1

-

2.

PERFORMANCE

2-1

MAXIMUM OUTPUT

n

The Maximum output of an engine is
initial run-in period with

all

the

open throttle valve. Therefore, it

the

output in

2-2

CONTINUOUS RATED OUTPUT

The continuous
running

beginning, because moving parts are not in a properly worn-in condition.

rated

at

an optimum speed most favorable from the point of view of engine life and fuel

output of an engine

consumption ratio. Therefore, it follows that when designing

such

standard power

as

developed

by

that engine,

moving parts properly worn-in, when operating with the fully

follows

that

is

such

a

new engine may not develop this maximum

power as developed

a

by

driving system for any

mechanism, with a model EY14, EY18-3, EY23, EY25-2 and EY27-2 engine,

the

continuous power requirement of

that

mechanism must

be

kept below

the

output specified.

2-3

MAXIMUM TORQUE

The maximum torque of an engine is

is

driving an external load,

consumption ratio

is

running

at

the

PERFORMANCE CURVE

at

rnax. output.

and

FUEL CONSUMPTION RATIO

while

max. output

is

AT

MAX. OUTPUT

that

driving torque of the driving shaft

the

engine

that

fuel consumption ratio

is

developing

its

of

PERFORMANCE CURVE

MODEL EY18-38

max. output. The fuel

an engine while

after

that

engine when

as

a

prime

mover,

continuous

at

which the engine

that

engine

its

rated

-2-

PERFORMANCE

CURVE

MODEL

EY23

7

( )

for

B

type

1.5(3.0)

1.0

(2.0)

6

I

5

kg-m

HP

I4

3

I

g1HP.h

3

50

2

300

250

2000

3000

4000

(1

000)

(1

500)

(2000)

rpm

__c

PERFORMANCE CURVE

MODEL EY25-2

(

)

for

B

type

.h

PERFORMANCE CURVE

MODEL EY27-2

(

)

for

8

type

1.4(2.8)

1.3(2.6)

7

I

kg-m

6

5

HP

I4

3

I

g1HP.h

340

2

320

2500

3000

3500

4000

(1250)

(1500)

(1750)

(2000)

rpm

-

-3

-

FEATURES

A

compact, lightweight and durable 4-cycle air-cooled engine with high power output,

embodying ingenious design technique and advanced production skill.

n

Simple construction, smart appearance, easy

start.

Reliable power for wide. variety of purposes, with smooth speed controll by

a

governor,

under varying

load

conditions.
Economical advantage through low fuel consumption.
Great versatility in installation through

a

360°

belt

extension possibility and a two side

oil

fill and drain arrangement.

GENERAL DESCRIPTJON

of

ENGINE CONSTRUCTION

CYLINDER, CRANKCASE

The

cylinder and

the

crankcase

are

die-cast

as

a

compact aluminium mono-block piece.

The

cylinder liner and

the

valve

seats

are

made of special alloy

cast

iron and

are

imbedded in

the

aluminium casting

as

inserts. The intake and exhaust ports

are

located

at

one side

of

the

cylinder and

are

also

made

of

inserted pieces in

the

casting.

The crankcase

is

separable

at

the driving

shaft

side and this separable piece constitutes

the

main bearing cover.

4-2

MAIN BEARING COVER

As

the aluminium die-cast main bearing cover

is

built onto the crankcase on the driving shaft

side, the engine 'inside

are

reached

for inspection, easily by simply removing it. It

is

also

provided with

a

flange and

boss

for directly mounting operating machines such

as

generators

and pumps.

There

are

two

oil filters serving also

as

oil gauges provided

at

two locations.

(However, in

EY18-3

or

EY23

engine,

at

one location in

the

carburetor

side.)

4-3

CRANKSHAFT

The crankshaft is machined from

a

carbon

steel

forging with

an

induction hardened crank pin.

On

the

fan side,

the

breaker

cam is provided and on

the

driving side,

the

crankshaft

gear

is

force-fit.

44

CONNECTING ROD

and

PISTON

The connecting rod

is

machined from an aluminium alloy forging in which the

forged

alloy itself

serves

as

the

bearing metal

at

both

ends. On

the

large end, an oil scraper

for

splashing

the

lubricating

oil

is

provided.

The piston is machined from an aluminium alloy casting and

is

provided with two grooves

for

compression rings and one groove

for

the

oil ring.

4-5

CAMSHAFT

The camshaft is machined from

a

carbon

steel

forging with integral intake and exhaust cams

and

is

provided with a force-fit cam gear.

In

the

model B engine,

the

camshaft

serves

also

as

the

driving shaft, being driven

at

half

the

crankshaft speed.

In

the

EY14D, EY23D, EY25-2D

and

EY27-2D

engines,

the

camshaft is machined from a special alloy

cast

iron with an integral

camshaft

gear,

and is supported by aluminium bearing metals machined integral with

the

crankcase

at

both ends. (no

ball

bearing is used)

n

-4

-

4-6

VALVE ARRANGEMENT

The exhaust valve is positioned

in

the

upstream side of the cooling air with the result that the

exhaust valve

is

intensively cooled for engine life improvement.

-

4-7

CYLINDER

HEAD

A

Ricardo type combustion chamber

of

ample area is employed for good combustion efficiency.

The spark plug

is

mounted obliquely to facilitate fuel tank mounting.

4-8

GOVERNOR

The flyweight type governor effectively operates to maintain

the

selected speed at varying

load.
The model

EY14, EY18-3

and

EY23

engine

is

equipped with a separate gearing for the governor

to

secure better performance.

4-9

COOLING

Cooling is accomplished

by

a

flow

of air circulated past the cylinder walls and head

fins

from a

combination fan-flywheel. The air

is

guided

by

a cylinder buffle

and

a head cover. The

EY14,

EY18-3,

EY23,

EY25-2

and

EY27-2

engines are equipped with curved vane fans made

in

two

modifications, each

for

direct drive and reduction drive engines.

4-10

LUBRICATION

Lubrication for rotating and sliding parts is accomplished

by

scooping and splashing the

oil

in

the crankcase

with

oil scraper attached to connecting rod.

4-11 IGNITION

The ignition system

is

of the flywheel magneto type

with

the ignition timing set

230

before
T.D.C. The magneto comprises a flywheel, ignition coil and a breaker, of which the flywheel
(serving also as a fan)

is

mounted on the crankshaft and the two other members are mounted

directly

in

the crankcase. (for details, refer

to

7.

MAGNETO

section)

The model

EY23

engine normally incorporates an electronic ignition system.

4-12 CARBURETOR

A

horizontal draft carburetor

is

employed. Its setting has been carefully determined after

through testing to achieve best starting, accelerating, fuel consumption, output and other

performances.

For

other details such as construction, refer to

9.

CARBURETOR

section.

4-13

AIR

CLEANER

The model

EY

14,

EY18-3

and

EY23

engines are equipped with an oval air cleaner incorporating

8

sponge element.

The cycl.one type air cleaner with a semi-wet double element is optional.

The

model

EY25-2,

EY27-2

engines are equipped

with

an

cyclone type semi-wet double element

air cleaner.

-5-

4-14

SECTIONAL

VIEW

of

ENGINE

4-14-1

MODEL

EY14

FI

Blower

ywheel

(Cooling

Housing

Starting

Pulley-

MODEL

EY14

ver

-6-

Fuel

Tank

MODEL

-7

EY14

-

4-14-2

MODEL

EY18-3

Cover

MODEL

EY18-3

-a-

/

/-

Tank

MODEL EY18-3

-9-

4-14-3

MODEL

EY23

Flywheel

Star

MODEL

EY23

7g

Cover

-

10

-

Con

/"

Tank

MODEL

-

EY23

11

Cam

Shaft

-

4-14-4

MODEL

EY25-2

and

EY27-2

MODEL

EY25-2

-

12

and

-

Cover

EY27-2

I

ti

I

I

\Cam

Shaft

MODEL

EY25-2

and

EY27-2

-

13

-