Robin EH30, EH34 Service Manual

ROBIN

ENGINE

ROBIN

TO

MODEL

AMERICA,

W1SCONSJ.N

CROSS

REFERENCE

INC.

ROBIN

LIST

ROBIN

EY08

EY15

EY

15V

EY20

EY20V EY23

EY28

EY35

EY40

EY45V

EY2

I

EY44 EY 18-3 EY25

EY27

-

v

WISCONSIN

W1-080

W1-145 W1-145V

Wl-185

W1-185V

W 1-230

w

1-280

W1-340

W

1-390

W

1

-450V

EY21W

EY44W

EY18-3W EY25W

EY27W

ROBIN

EHl1

EH12

EHl5

EH17

EH2

1

EH25 EH30 EH30V EH34 EH34V

EH43V

EC13V

DY23

DY27

DY30 DY35 DY4 1

TWO

DIESEL

CYCLE

WO1-115 wo1-120 WO1-150

WOI-170

wo1-210

WO

1-250

WO1-300

WOI-3oov WO1-340

WO

1

-3

40V

WO

1

-430V

WT1-125V

WRD WRD

WRD1-300 WRDI-350

WRD1-410

1-230

1-270

CONTENTS

Section Title Page

1

.SPECIFICATIONS.

2.PERFORMANCE

2-1

2-2

2-3

2-4

3.FEATURES

Maximum

Continuous Rated Output

~~~i~~~

performance

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

4.GENERAL DESCRIPTION OF ENGINE COMPONENTS

4-

1

Cylinder And Crankcase

4-2

4-3

4-4 4-5 4-6

4-7

4-8

4-9

4-

4- 1 1 4-

4-

Main Bearing Cover Crankshaft Connecting Piston Rings Camshaft Valve Arrangement Cylinder Head Governor System

10

Cooling Syst ern

Lubrication

12

Ignition

13

Carburetor

14

Air Cleaner

15

Balancers

16

Decompression System

17

Sectional View

5.DISASSEMBLY AND REASSEMBLY

5-

1

Preparations

5-2

5-3

5-4

5-5

6.MAGNETO

6-

6-2

6-3

7.

AUTOMATIC DECOMPRESSlON SYSTEM

Special Tools Disassembly Procedures Reassembly Procedures Break-in Operation

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

1

Flywheel Magneto Basic Theory

Wiring Diagram

8.CARBURETOR.

8-

1

Operation And Construction

8-2

Disassembly And Reassembly

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

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

Output

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

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

T~~~~~

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

curves

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

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

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

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

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

Rod

And

piston

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

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

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

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

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

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

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

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

System

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

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

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

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

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

Of

Engine

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

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

And

Suggestions

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

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

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

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

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

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

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

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

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

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

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

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

1

3

4

6

7

8 8

8

9

10

10 11

11

12

14

15

32

42

43

44

45

46

47

1.

SPECIFICATIONS

Model

Type Bore

X

Stroke

Piston Displacement

EH30

EH30B

Air-Cooled. 4-Cycle. Single-Cylinder, Horizontal

EH30BS

78

X

61

291

mm

cc (1

(3.07

7.76

EH30D

P.T.O.

X

2.40

cu.in.1

in.)

Shaft,

I

Gasoline

EH30DS

Engine

Compression Ratio

-~

Cont

i nuous

output

Max.

Max. Torque

of

Direction Cooling system

~ ~ ~~

Valve Arrangement

Lubricant Capacity

Carburetor

Fuel Fuel Consumption Ratio] Fuel Feed System Gravity Type

~ ~~ ~~ ~~

~~ ~~

Rotation

~~~~ ~ ~ ~

of

Lubricant

I

7.0/1800

9.0/1800

3-9/1250 kg m/rpm

Counterclockwise

Automobile Oil SAE

230

HP/rpm

As

Forced Air Cooling

Overhead Valve

1.2

liters

Horizontal Draft, Float

Automobile Gasoline

gr/HP-h At Continuous Rated Output

8.3

Viewd From P.T.O. Shaft Side

Splash Type Lubrication

#

(0.32

1.95/2500

20, # 30

U.S.

7.0/3600

9.0/3600

or

1

OW-30

gal.)

Type

HP/rpm HP/rpm

kg

m/rpm

Fuel Tank Capacity

Spark Plug Charging Capacity Starting

Speed Reduction Governor System Air Cleaner

Dry Weight

I

1

Dimensions

System

,

Length

Width Height

Recoil

I

3

1

.Okg

363mm

Starter

1/2

(

68.31

(

14.29in.)

Cam Shaft Drive

b.)

-1-

6

liters (1.58

Flywheel Magneto (Solid State) Ignition System

NGK

I

Electric Starter

BP6ES (CHAMPION

12V-1.3A

Recoil and

I

Recoil

U.S.

gal.)

N9Y)

-

Starter

I

Centrifugal Flyweight Type

Double Element Type

34.0kg ( 75.01

333mm

Specifications are subject

(1

3.1

1

395mm

482mm

b.)

in.)

30.0kg

363mm

(1

5.55

(1

8.98

(

in.)

66.1

I

b.)

(1

4.29in.)

to

change without nofice.

I

12V-

Recoil and

Electric Starter

-

33.0kg

333mm

1.3A

(

72.81

(1

3.1

b.)

1

in

Type

Model

EH348

Air-Cooled,

4-

Cycle,

EH34

EH34BS

Single- Cylinder, Horizontal

1

EH34D

~~~~~

P.T.O.

Shaft,

EH340S

Gasoline Engine

Bore X Stroke Piston Displacement

Compression Ratio

of

Rotation

of

Lubricant

Cont i nwus

Max.

output

Max. Torque

Direction Cooling system Valve Arrangement tu brication

Lubricant Capacity

Carburetor

Fuel

I

84

X

61

mm

338cc

8.0/1800

1

1.0/1800

4.82/1250 kg Counterclockwise As Viewd From

Automobile Oil SAE

HP/rpm

m/rpm

Forced Air

Overhead Valve

Splash Type

1.2

liters

Horizontal Draft, Float Type

Automobile Gasoline

(3.31

(20.63

8.3

#

20,

(0.32

X

2.40

cu.in.)

2.41/2500 P.T.O.

Cooling

#

30

U.S.

in.)

8.0/3600

1

1.0/3600

Shaft Side

or

~ ~~

gal.)

kg m/rpm

1

OW-30

~~ ~~

HP/rpm

.

Fuel Consumption Ratio Fuel Feed System Gravity Type

Fuel Tank Capacity

Ignition Spark Plug Charging Capacity

Starting System

Speed Reduction Governor System

Air Cleaner

Dry Weight

System

Height

I

Recoil

I

3

1

.Okg

363mm

-

Starter

1/2

(68.31

(1

230

Cam Shaft Drive

b.)

4.29in.)

gr/HP-h At Continuous Rated Output

6

liters

Flywheel Magneto (Solid State)

NGK

Electric Starter

BP6ES (CHAMPION

12V

-

Recoil

(1.58

1.3A

and

Recoil

I

Centrifugal Flyweight Type

Double Element

34.0kg

333mm

Specifications are subject

(

75.01

(1

3.1 1 in.)

395rnm 482mm

b.)

30.0kg

363mm

(1

5.55

(1

8.98

U.S.

gal.)

-

Starter

Type

(

66.1

(1

in.) in.)

to

N9Y)

I

b.)

4.29in.)

change

12V

Recoil and

Electric Starter

-

33.0kg

333mrn

without

-

(

72.81

(1

1.3A

3.1

b.)

1

in

nofice.

I

,

I

-2-

2.

PERFORMANCE

2-1

The maximum output is the output condition that all the moving parts are properly worn in after the initial break- in period.

A

-in.

2-2

The continuous rated output most favorable from the view point When the engine required

2-3

The maximum torque output at certain revolution.

MAXIMUM OUTPUT

new engine

may

not produce full maximum output while its moving parts are still not

CONTINUOUS

is

installed on a certain equipment,

from

MAXIMUM

the engine be kept below this continuous rated output.

TORQUE

of

an engine with its throttle valve fully opened under

RATED

is

the torque at the output shaft when the engine is producing maximum

OUTPUT

is

the output

of

an engine at optimum governed speed which

of

engine’s life and fuel consumption,

it

is

recommended that the continuous output

broken

the

is

-3-

2

-

4

PERFORMANCE

CURVES

OEHBOD,

B

9

8

7

Kg

-

m

6

5

4

3

2

1

0

2000

(1

000)

2400

(1

200)

2800

(1

400)

3200

(1

600)

3600

(1

800)

CONTINUOUS

RATED

OUTPUT

RECOMMENDABLE

\

HORSEPOWER

RANGE

REVLOUTION-

r.

p.

m.

-4-

*EH34D,

B

Kg

-

w

3

0

m

HP

A

52

B

w

cn

0

I

CONTINUOUS

RATED

RECOMMENDABLE

HORSEPOWER

OUTPUT

RANGE

2000

(1

000)

(1

REVLOUTION-

2400

200)

2800

(1

400)

3200

(1

600)

-5-

r.

p.

3600

(1

800)

m.

3.

FEATURES

1.

The overhead valve design offers a compactness, light weight and ideal combustion charastristics resulting in more power from less fuel

2.

The vibration free design with the twin balancer system and lighter reciprocating parts.

3.

Such with extralong teeth and the blower housing and muffler cover made

"DAMPING

4.

The automatic decompression system offers easy, dependable starting.

5.

The muffler air flow

4.

parts

as the large capacity muffler, dual element air cleaner, helical

SHEET"

and

much

easier

reduce noise

carburetor are located on opposite sides, making the arrangements for cooling

in

the design of power equipment.

GENERAL DESCRIPTION

to

and

a minimum.

OF

ENGINE

prolonged engine life.

COMPONENTS

type

of

balancer gear

resin laminated

4-1

The cylinder and crankcase aluminum diecasting. The cylinder liner, made of special cast iron, is molded into the aluminum casting. The crankcase has a mounting surface on the output shaft side, where the main bearing cover

is

4-2

The main bearing cover diecasting, which is mounted on the output shaft side of the crankcase. Remove the main bearing cover to inspect inside of the engine.

Pilots and bosses are machined on the cover

direct

machines as generators and pumps.

Oil

for

CYLINDER

attached. (See Fig.

MAIN

mounting

gauge (fillers) are on both

easy maintenance.

AND CRANKCASE

1.)

BEARING COVER

of

the engine onto such

is

sides

single piece

an aluminum

of

the cover

for

Fig.

1

-6-

fig.

2

4-

3

CRANKSHAFT

The crankshaft

crank pin

is

forged carbon steel, and the

induction-hardened. The output end of the shaft has a crankshaft gear and balancer gear that are pressed into position.

(See

Fig.

3.)

4-4

The connecting rod and bearings.

CONNECTING ROD

is

forged aluminum alloy,

its

large and small ends function as

The

piston

is

AND

an

aluminum

PISTON

alloy

casting, and carries two compression rings and

one

oil ring.(See

Fig.

4.)

B

TYPE

/

Fig.

D

TYPE

3

4-5

The

tile

mder

'l'he

PISTON RINGS

Piston rings are made

profile

SWOJI~

-

CUT:.

oil

ring

coil expander

(xmsumption.

of

the

ring

consists

far

top

has

better

ring

a

tapered

of

is

a

cutter

sealing

special cast

barrel

face

ring

and

face

with

and

less

iron.

and

an

oil

-7-

a

Fig.

4

5

.TOP

RING

SECOND

OIL RING

RING

4-

6

CAMSHAFT

The camshaft

for

the

D-

type engine is made of special cast iron and camshaft gears are casted together in one piece. Both sides of the shaft fit into the plane

on

bearings

the crankcase and main bearing

cover.

B-

The camshaft for forged

carbon

steel

type engine is made

and

also functions as

PTO

shaft.

is

Cam gear

press fitted on the shaft and ball bearings are employed on the both sides for supporting the shaft. (See Fig.

6.1

4- 7 VALVE ARRANGEMENT

The intake valve is located

on

flywheel side of the cylinder head. Hard alloy valve seats are moIded in the cylinder head

stellite

is

fused to the exhaust

and

valve face.

to

The cylinder baffle leads cooling air

the

exhaust valve area for the optimum cooling.

(See Fig.

7.)

of

I

Fig.

B

6

TYPE

4-8

The cylinder head

CYLINDER

HEAD

is

an

aluminum

die

which utilizes wedge type combustion chamber for the highest combustion efficiency.

-Fig.

(See

8.)

casting

VALVE

I

Fig.

7

Fig.

8

-8-

4-

9

GOVERNOR SYSTEM

The governor

is

a centrifugal flyweight

type

which ensures constant operation at the selected speed against load variations. The governor gear with governor weights installed in the crankcase balancer shaft. (See Fig.

4-

10

COOLING

The large fins

SYSTEM

on

the flywheel provide sufficient cooling air capacity

and

9.1

driven by the

is

area and cylinder. The cylinder baffle helps the cooling air flow efficiently.

Fig.

9

for

the inlet and exhaust

4-

11

LUBRICATION

A11

the rotating and sliding parts

by

Fig.

the

10.)

lubricated rod. (See

oil scraper

are

on

the connecting

splash-

I

OIL

SCRAPER

Fig.

10

-9-

4-

12

IGNITION

SYSTEM

The ignition system

is

a transistor controlled magneto ignition system which cosists of a flywheel and an ignition coil with a built in transistor mounted on the crankcase.

an

This system has easy starting. (See Fig.

4-

13

CARBURETOR

ignition timing advance for

11.)

The engines are equipped with a horizontal draft carburetor that has a float controlled fuel system and a fixed main The carburetors are calibrated carefully sure starting, good acceleration,

jet.

low

for

the

fuel

consumption and sufficient output.

For

the datails, refer to page

"8

CARBURETOR".

(See

Fig.

12.)

46,

section

I

Fig.

11

4-

14

AIR

CLEANER

The air- cleaner

is

a heavy - duty type with a

dual element system. (See Fig.

13.)

Fig.

12

I

Fig.

13

-

10

-

4-

15

BALANCERS

Unbalanced inertia force is balanced

by

the two

balancers which rotate at the same speed with

to

the crankshaft

(See Fig.

4-

16

An

automatic decompression mechanism which

14.)

DECOMPRESSION

effectively reduce vibration.

SYSTEM

opens exhaust valve before the piston reaches

top

is

compression

for

easy starting. (See

assembled on the camshaft

Fig.

15)

BALANCER

AUTOMATIC DECOMPRESSOR SYSTEM

Fig.

1

14

Fig.

I5

-

11

-

4-

17

SECTIONAL

VIEW

OF

ENGINE

FUEL

1

/FUEL

TANK

FLYWHEEL

(COOLING FAN)

-

12

-

'

MAIN

BEARING

COVER

PLUG

COVER

ROCKER

ARMS

DRAIN

PLUG

\BALANCER

-

13

-

SHAFT

2

5.

DISASSEMBLY

5-

1

PREPARATIONS

1)

When disassembling the engine, memorize the locations be

reassembed correctly.

tags

be

attached

2)

Have

3)

To

4)

Carefully handle disassembed parts, and clean them

5)

Use the correct

boxes ready to keep disassembed parts by group.

prevent losing and misplacing, temporarily assemble each

to

tools

AND

If

REASSEMBLY

SUGGESTIONS

yor are uncertain

them.

in the correct way.

of

individual parts

so

that they can

identifying some parts, it is suggested that

with

group

washing

oil

of

if

disassembed

necessary.

parts.

5-2

SPECIAL

Tool

209 - 95004

228-95003-07

No.

-

07

TOOLS

PISTON

Flywheel

Piston

RING

COMPRESSOR

/

puller

ring

Tool

with

bolt

compressor

Use

For pulling

For placing piston ring

off

the flywheel

Fig.

76

-

FLYWHEEL

14

-

PULLER

5-

3

DISASSEMBLY

PROCEDURES

Step

1

Part

Oil

to

remove

drain

(1)

(2)

Remove

To

discharge

gauge.

Procedures

oil

drain plug

oil

quickly,

and

drain

remove

oil.

oil

Remarks

Be

careful not

the gasket.

to

lose

14mm

Tool

box

wrench

Fig.

17

-

15

-

Step Part

I

2

Air

to

remove

cleaner

Procedures Remarks

(1)

Remove air cleaner cover.

(2)

Loosen

two wing

element.

(3) Loosen

choke

(4)

Remove two flange

screw on swivel and

knob.

and remove cleaner

M6

flange nut

M6

X

12mm

.-.-

bolt

and washer

bolts

and remove washer and gasket for

nuts

and a bolt

base.

2pcs.

*

pull

out

lpce.

Be

careful not

wing

bolt.

Pull

off

breather

from cleaner

to

base.

lose

pipe

lonun

Tool

box

wrench

CLEANER

M6

BASE

FLANGE NUT

WING

:

2pcs.

BOLT

M6

BOLT AND WASHER

CLEANER

COVER

Fig.

18

-

16

-

Step

-

3

4

Control panel and bracket

Carburetor

Procedures

(1)

Unclamp

(2)

Disconnect wires from connectors.

(3)

Loosen

wires

from breather cover.

two bolt and remove control

panel.

M5

X

(4)

Loosen.

lOmm

bolt

flange

and washer

bolt

bracket.

'

M6

x

8mm

frange bolt

(1)

Close fuel valve.

(2)

Disconnect fuel

(3)

Remove carburetor carefully governor rod and

pipe

from

rod

governor lever.

-*..

and

*

-0.

Ipse.

fuel strainer.

unhooking

spring

2pcs.

remove

from

Remarks

Be

careful not to bend

rod

governor

rod

spring.

or

stretch

8mm

box

lorn

box

Tool

wrench

Fig.

19

BRACKET

KEY

SWITCH

\

-

17

-

1

Step

]part

to

remove1

Procedures

I

Remarks

I

Tool

I

5

Speed

~

lever

~

governor lever

contral

and

(1)

Unhook

lever.

(2)

Remove clip, friction plate,

(3)

Loosen

lever.

governor spring

the

wing

and

bolt

nut,

speed

and remove governor

from

governor

stop

plate,

control lever.

Note governor spring hole on governor lever.

ROD

GOVERNOR LEVER

SPRING

I

GOVERNOR

SPRING

'ER

Fig.

20

-

18

-

Step

~~

F

'art to

rernovc

Procedures

I

Remarks

I

Tool

I

6

7

8

Oil

(Option)

Oil

bracket

(Option)

Muffler

M8

FLANGE

sensor

(1) Unclamp sensor cord from main

bearing cover.

(2)

Remove

oil sensor unit.

Remove oil sensor bracket.

(1

1

Loosen two flange nuts and a bolt.

(2) Remove muffler and muffler cover

from stud bolts.

NUT

M8 flange nut M8

X

:

Ppcs.

16mm

bolt and washer lpce.

2pcs.

Be very careful not to

damage stick and

sensor

Be careful not

unit in any way.

to

lose

muffler gasket.

12mm

box wrench

MUFFLER

COVER

Fig.

21

-

GASKET

19

-

M6

SCREW

SPRING

/

AND

WASHER

:

2~~s.

'art

to

Electric starter

(Option)

remove(

Procedures

(1)

Remove black wire from electric starter.

(2)

Loosen two bolts and remove electric starter.

M8

x

30mm

M8

washer

M8

spring washer

..........

bolt

~ ~~~

.*.-

2pcs.

-

2pcs.

I

Reattach terminal nut

to

from

Remarks

starter

missing.

~~

to keep

it

12mm

wrench

Tool

socket

Diode rectifier

Magnetic

(1)

Disconnect wires. green/white

white

(2)

Remove

from crankcase.

M6

Loosen two flange bolts and remove magnetic switch. switch

M6

X

ELECTRIC

...........

X

12mm flange bolt

STARTER

* - *

diode

-

2

1

rectifier and bracket

-.*-

lpce.

....

2pcs.

\

lOmm

box wrench

Fig.

22

MAGNETIC SWITCH

M6

FLANGE

-

20

-

BOLT

:

2pcs.

BLACK WIRE

/

Step

Part

to

remove

Procedures

Remarks

Tool

12

Fuel

tank

Loosen

fuel

tank

M8

flange

four

and

flange

nut

nuts

remove

-0.-

4pcs.

fuel

from

tank.

bottom

of

Wipe

thoroughly.

off

spilt

fuel

12mm

wrench

socket

FUEL

TANK

STRAINER

Fig.

23

-

21

-