Robin EH30V, EH43V, EH34V Service Manual

ROBIN AME

ROBIN

TO

WISCONSZN

ROBIN

ENGINE MODEL CROSS REFERENCE

LIST

ROBXN

EY 08 EY15 EY 15V EY20 EY20V EY23 EY28 EY3

5

EY40 EY45V

EY2

1

EY44

EY 18-3

EY25

EY 27

EHll EH12

EH15

EH17

EH2

1 EH25 EH30

EH3OV EH34 EH34V EH43V

EC13V

DY23

DY27

DY30

DY3 5

DY4

1

WISCONSIN

ROBIN

SIDE

VALVE

w

1-080 W1-145 w1-145v W1-185 Wl-185V

W

1-230

W

1-280

W1-340

W

1-390

w

1

-450v

EY2 1

W

EY44W

EY25W EY27W

EY

18-3

W

-

WO1-115 wo1-120 WQ1-150 WO1-170 wo1-210 WO 1-250 WO1-300 WO

1

-300v

WO

1-340

WO1-340V

WO1-43OV

TWO

CYCLE

WT1-125V

DZESEL

WRD1-230

WRD

1-270 WRD1-300 WRD1-350 WRD1-410

Section

Title

ONTENTS

Page

1

.SPECIFICATIONS

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

2JERFORMANCE

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

2-

1

Maximum Output

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

2-2

Maximum Torque At Maximum Output

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

2-3

performance

curves

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

3.

FEATURES

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

4.GENERAL DESCRIPTION OF ENGINE COMPONENTS.....

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

4-

1

Cylinder And Crankcase

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

4-2

~~i~ ~~~~i~~

cover

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

4-3

Crankshaft

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

4-4

Connecting Rod And Piston

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

4-5

Camshaft

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

4- 6

Valve Arrangement

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

4-7

Cylinder Head

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

4-8

Governor System

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

4-9

Cooling System

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

4- 10

Lubrication

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

4-

1 1 Ignition System

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

4- 12

Carburetor

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

4- 13

Air Cleaner

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

4- 14

Balancers

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

4- 15

Decompression System

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

1

2 2 2

2

4

4 4 4 5 5 5 6

6

7

7 8 8

8

9

4-

16

Sectional View Of Engine

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

10 12 12 12

13 28 42 42 42 43

5.DISASSEMBLY AND REASSEMBLY

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

5-

1

Preparations And Suggestions

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

5-2

Special Tools

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

5-3

Disassembly Procedures

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

5-4

Reassembly Procedures

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

6.MAGNETO

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

6-

1

Flywheel Magneto

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

6-2

Basic Theory

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

6-3

Wiring Diagram

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

7.AUTOMATIC DECQMPRESSlON SYSTEM

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

44

8.CARBURETQR

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

45 45 46 48 48 52

8-

1

Operation And Construction

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

8-2

Disassembly And Reassembly

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

-

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

g.STARTING SYSTEM

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

9-

1

Recoil Starter

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

9-

2

Electric Starting Motor (Option)

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

ECIFICATIONS

Model

Type

Bore

X

Stroke

Piston Displacement

Maximum Horsepower

Maximum Torque

Rotation

Cooling

Lubrication

Lubricant

Carburetor

Fuel

Fuel Feed

Governor System

Ignition System

Spark Plug

Lighting Capacity

Starting System

Dry Weight

Dimensions Without P.T.0 Shaft LXWXH

I

EH30V

EH34V

EH43V

1

I

Air-Cooled, 4- Cycle, Vertical Shaft, Overhead Valve, Gasoline Engine

78x61 mm

(3.07

X

2.40

in.)

291 cc

(1

7.76

cuin.)

9/3600

HP/rpm

(6.7/3600

KW/rpm)

1.95/2500

kg * m/rpm

14.1/2500 ft.lbs/rpm)

84

X

61

mm

(3.31

X

2.40

in.)

338

cc

(20.63

cu.in.1

1 1

/3600

HP/rpm

(8.2/3600

KW/rpm)

2.41

/2500

kg m/rpm

17-4/2500

ft.lbs/rpm>

89x69

mm

(3.50

X

2.71

in.)

429

cc

(26.1

8

cu.in.1

13/3600

HP/rpm

(9.7/3600

KW/rpm)

2.85/2500

kg

m/rpn.

(20.6/2500

ft.Ibs/rpm

Counterclockwise

As

Viewd From PTO Shaft Side

Forced Air Cooling

Oil

Pump Type

Pressurised lubrication with full flow oil filtel

Automobile Oil SAE

#

20,#

30

or

1

OW

-

30

Horizontal Draft Type

Automobile Gasoline

Gravity Type

Centrifugal Flyweight Type

Flywheel Magneto (Solid State)

NGK BP6ES (CHAMPION N9Y)

12V- 2.5A/3000rpm Battery Charge

Recoil Starter (Electric Starter Optional)

28

kg (61.7 I bs.)

31

kg

(68.3

I

bs.)

386

X

383

X

327

mm

(1

5.20

X

15.07 X 12.88

in.)

410 X 401

X

349

mm

(1

6.1

4X

15.78X

13.74

in

Specificat[ons and dimensions are subject

to

change without notice.

-1-

2.

PERFORMANCE

2-1

MAXIMUM OUTPUT

The maximum output of an engine

is

such a standard power as produced by the engine with

its

throttle valve fully opened after

its

initial break-in period when all the moving

parts

are properly worn in. Therefore, a new engine may not produce the maximum output in the beginning because the moving parts are not in

a

properly worn-in condition.

2-2

MAXIMUM TORQUE

The

maximum torque indicates the torque

at

the output shaft when the engine is producing the

maximum output.

2

-

3

PERFORMANCE CURVES

EH30V

a

1

kg

-

m

REVOLUTION

r.

P.

m

-2-

0

EH34V

I

11

10

9

a:

g8

a

W

cn

a:

0

I

7

6

0

EH43V

13

a

I

It

l2

11

10

9

8

n

I

MAXIMUM

TORQUE

I

10

2000

2500

3000

3500

4000

L

REVOLUTION

-

I.

P.

m.

2.5

kg-

m

2.4

2.2

2.1

w

3

8

P

L

1500

2(

=

MAXIMUM

TORQUE

0

2500

3000

3500

REVOLUTION

-+

r.

P.

m.

-3-

3.

FEATURES

1.

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

2.

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

3.

The

parts

with extra long teeth and a blower housing and muffler cover made of resin laminated

"DAMPING

4.

The automatic decompression system offers easy, dependable starting.

5.

The muffler and carburator are located on opposite sides, making the arrangements for cooling air flow much easier in the design

4.

GENERAL DESCRIPTION

such as a large capacity muffler, dual element air cleaner, helical type balancer gear

SHEET"

reduce noise to a minimum level.

of

power equipment.

OF

ENGINE COMPONENTS

,"-,

4-1

The cylinder and crankcase aluminum diecasting. The cylinder liner, made

of

casting. The crankcase has a mounting surface onthe output shaft side, where the main bearing cover is

4-2

The main bearing cover diecasting, which side of the crankcase. Remove the main bearing cover The main bearing cover also functions as an oil pan, with drain plug. (See Fig.

CYLINDER AND CRANKCASE

is

single piece

special cast iron, is molded into the aluminum

attached. (See Fig.

MAIN

to

BEARING

is

inspect inside

a

trochoid oil pump,

1.)

COVER

is

an aluminum

mounted on the outprt shaft

of

the engine.

oil

filler and

oil

2.)

Fig.

I

-4-

Fig.

2

4-

3

CRANKSHAFT

The crankshaft

is

forged carbon steel, and the

e

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

(See Fig.

3.)

BALANCER GEAR

\

CRANKSHAFT

GEAR

Fig.

3

4-4

CONNECTING

ROD

AND

PISTON

The connecting rod is forged aluminum alloy, and its large and small ends function as bearings. The piston

is

an

aluminum -alloy casting, and carries two compression rings and one oil ring.(See

Fig.

4.)

Fig.

4

4-

5

CAMSHAFT

The camshaft

is

a hollow shaped and made

of

special cast iron with the camshaft gear casted together.

A .

cenerifugal decompression lever

is

assembled

on the camshft. The lubrication

oil

pump

is

driven

by

the pin installed on the end

of

the

camshaft. (See

Fig.

5.)

Fig.

5

-5-

4-

6

VALVE ARRANGEMENT

The intake valve

is

located at flywheel side of the cylinder head. Hard alloy valve seats are molded in the cylinder head and stellite is fused to the exhaust valve face.

to

The cylinder baffle leads cooling air

the

exhaust valve area for the optimum cooling.

(See Fig.

4-7

The cylinder head

6.)

CYLINDER HEAD

is

an aluminum die casting, which utilizes wedge type combustion chamber for the highest combustion efficiency.

(See Fig.

7.)

EXHAUST 'VALVE

Fig.

6

INTAKE

VALVE

4-

8

GOVERNOR SYSTEM

The governor which ensures constant operation

is

a centrifugal flyweight type

at

the selected speed against load variations. The governor gear with governor weights installed on the bearing cover and driven by the camshaft gear. (See Fig.

8.)

is

-6-

Fig.

7

8

4-9

COOLING

SYSTEM

The large fins on the flywheel provide sufficient cooling air capacity for the inlet and exhaust area and cylinder.

a

The cylinder baffle helps the cooling air flow efficiently.

4-

10

LUBRICATION

Both EH30V (EH34V) and EH43V have a trochoid pump inside the main bearing cover that is driven by the camshaft. EH3OV and EH34V use forced splash

type

lubrication while the larger EH43V employs a pressurized

-lubrication which pressure lubricates all the rotating surfaces of the crankshaft and supplies oil to piston, cylinder and connecting rod’s small end from the oil jet on crankshaft arm.

(See

Fig.

9.)

OIL FILTER

/

BEARING ,COVER

I

CAMSHAFT

Fig.

9

-7-

4-

1

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.

This system has

an

ignition timing advance

for

the easy starting. (See

Fig.

10.)

Fig.

10

4-

12

CARBURETOR

The engines are equipped with a horizontal

draft carburetor that has

a

float controlled fuel

system and a fixed main

jet.

The carburetors are calibrated carefully

for

the

sure starting,

good

acceleration,

low

fuel

consumption and sufficient output.

For

the datails, refer

to

page

45,

section

"8

CARBURETOR".

(See Fig.

11.1

Fig.

1 1

4-

13

AIR

CLEANER

The air- cleaner is a heavy- duty type with a dual element system. (See

Fig.

12.1

I

A

CLEANER BASE

I

ELEMENT

I

CAP

hUT

I

Fig.

12

-8-

4-

14

BALANCERS

Unbalanced inertia force is balanced

by

the two balancers which rotate at the same speed with the crankshaft to effectively reduce vibration.

(See

Fig.

13.)

I

BLANCER

4-

15

DECOMPRESSION

SYSTEM

An

automatic decompression mechanism which opens exhaust valve before the piston reaches compression top is assembled on the camshaft for easy starting. (See

Fig.

14)

Fig.

13

I

AUTOMATIC DECOMPRESSOR SYSTEM

*$

RETURN

SPRING

Fig.

14

-9-

4-

16

SECTIONAL

VIEW

OF

ENGINE

r

FLYWHEEL (COOLING FAN)

r

STARTING PULLEY

I-

RECOIL STARTER

-

lo

-

BALANCER SHAFT

2

BALANCER SHAFT

1

CONNECTING

ROD

TMUFFLER

CAP

M

CARBURETOR

AIR CLEANER

OIL

FILTER

CAMSHAFT

-

11

-

5.

DISASSEMBLY

5-

1

PREPARATIONS AND SUGGESTIONS

1)

When disassembling the engine, memorize well the locations of individual parts can be reassembed correctly.

be

that tags

2)

Have boxes ready to keep disassembed parts by group.

3)

To

prevent missing and misplacing, temporarily assemble each group of disassembed parts.

4)

Carefully handle disassembed parts, and clean them with washing oil

5)

Use the correct tools in the correct way.

attached to them.

AND

If

REASSEMBLY

yor are uncertain

of

identifying

some

parts,

if

so

it

is suggested

necessary.

that they

5-2

SPECIAL TOOLS

Tool

No.

209

-

95004

-

07

228 - 95003

-

07

PISTON

Tool

Flywheel puller with Piston ring compressor

RING

COMPRESSOR

bolt

/

Use

For

pulling off the flywheel

For placing piston ring

Fig.

15

-

FLYWHEEL

12

-

PULLER

5-

3

DISASSEMBLY PROCEDURES

Part

to remove

Oil

drain

Fuel tank

Procedures

Remove

(1) (2)

oil

drain plug and drain oil. 17mm

Turn

remove fuel Fuel shut-off valve and fuel line.

6

off fuel shut - off valve

tank.

d

X

~OITUII

4

X

35m

Bolt

*.**--**

Bolt

*-.-..*.

2pcs.

1

pce.

and

Remarks

Be

careful not to

the gasket.

lose

lOmm

Tool

Box

wrench

BOLT

I

AND

WASHER

6

+

Fig.

I6

-

13

-

Step

3

Part

to

remova Procedures

Air cleaner

(1)

Remove air cleaner cover and element.

6

d

Plastic nut

6

d

Wing

nut

(2)

Remove

6

d

6

d

(3)

Remove breather hose from cleaner

base

(4)

Remove cleaner

cleaner) from stud

6

air

X

2Omm

x

lOmm

and

Nut

--**

cleaner bracket

Bolt

.--.

Bolt

*.-e

crankcase.

base

bolts.

2pcs.

lpce. lpce.

and gasket

(Air

Remarks Tool

lOmm

Box

wrench

6

Q

FLANGE NUT:

2pcs.

6

Q

CLEANER

FLANGE

COVER

BOLT

Fig.

17

-

14

-

tep

Procedures

Remarks

Tool

4

control

Governor (1) Remove governor lever from governor lever shaft.

(1) Remove speed control assembly from

case.

crank governor lever.

q5

X

6

(2) Remove choke rod from speed

assembly, then remove choke rod from choke shaft of the carburetor.

6

q5

x

(2)

Remove rod spring and governor rod from governor lever, then remove rod spring and governor rod from throttle shaft

Then governor spring from

16mm Bolt

25mm Bolt

of

the carburetor.

-...

*-a.

2pcs.

lpce.

1

control

Memorize govenor spring hooking position.

or

mark the

10mm

Box

wrench

GOVERNOR

SHAFT

/

ROD

-

SPRING

Fig.

15

Ppcs.

19

-

Part to remove

Step

Procedures

Remarks

Tool

6

Carburetor

Muffler

(1)

Remove carburetor from stud bolts.

(2)

Remove gasket insulator from stud bolts.

(1) Remove muffler and muffler cover

from stud

84

8

4

x

(2)

Remove gasket (Muffler) from stud

bolts.

Nut........

16mm

bolts.

Bolt

(

Insulator ) and

.....

2pcs.

....

lpce.

Be careful not to the gasket.

lose

12mm Box wrench

Fig.

20

-

16

-

Step

'art to remove

-

8

9

-

Electric starter

(Option)

Diode rectifler

Procedures

(1)

Remove Black Wire From Starter.

6

q5

Nut

***.*

1

pce.

(2)

Remove electric starter from crank-

case.

8

9

x

30mm Bolt

(1)

Disconnect wires.

GreedWhite

White

(2) Remove diode rectifier and bracket

from crank case.(See Fig. 22.)

6

q5

x

.

. . .

15mm Bolt

*

-

. . . . . .

-.--

2pcs.

2

*

1

....

2pcs.

Electric

Remarks

~~

Reattach The terminal nut to the motor to keep it from missing.

lOmm

12mm

lOmm

Tool

Box

wrench

Fig.

21

-

17

-

Step

l~art

to

remove1

Procedures

Remarks

Tool

lo

11

I

Blower housing

/

6

+

FLANGE BOLT

Remove

6

x

8mm

6

d

X

8rn

recoil

from blower housing.

Bolt

*.e-

4pcs.

Bolt

.--.

4pcs.

:

4pcs.

from

crankcace.

lorn

Box wrench

I

l0mm

/

Box wrench Remove blower housing

BLOWER

/

HOUSING

Fig.

23

.ANGE

BOLT

:

4pcs.

-

18

-

Step

Part

to

remove

Ignition coil

(1)

Remove spark plug plug

and

(2)

Disconnect kill switch comes out from ignition coil from kill switch on speed control

(3)

Remove ignition coil from

6

0

x

Procedures

grommet from blower housing.

30mm

Bolt

I

cap

**-*

2pcs.

GROMMET

from spark

wire

which

assy.

crankcase.

Remarks Tool

6

+

BOLT AND WASHER

IGNITION COIL

:

2pcs.

I

KILL

SWITCH

&$

I

WIRE

Fig.

24

-

19

-

Step

lPart

to

13

I

Flywheel

rem0

(1) Remove

8

X

(2)

Remove nut

(See Fig.

16 4 Nut

(3)

Remove flywheel using flywheel puller.

(See

(4)

Remove charge coil.(See Fig.

6

d

X

Procedures

rotating

12mm Bolt

26.)

---a

Fig. 27.)

30mm Bolt

from

lpce.

screen

.-.-

3pcs.

crankshaft.

*-*=

2pcs.

1

from flywheel.

28.)

Remarks

Flywheel can easily be removed by striking

of

the head

bolt

of

a

with

the center

flywheel puller

hammer.

12mm

24mm

lOmm

Tool

Box

wrench wrench

wrench

$-

"

8

+

BOLT

STARTER

'FLYWHEEL

:

BPCS.

PULLEY

1

Fig.

26

Fig.

25

-

I

20.

-

fig.

Fig.

27

CHARGE

28

COIL

Step

to

remove

Remarks Procedures Part

Tool

14

Cylinder baffle etc.

(1)

Remove Cylinder Baffle.

6

4

x

8mm Bolt

(2) Remove exhaust manifold and gasket.

8

4

Nut

****

(3)

Remove spark plug.

..-.

2pcs.

4pcs.

lOmm Box wrench

BOX

12mm

19mm Plug wrench

wrench

GASKET

EXHAUST MANIFOLD

T

%

Fig.

29

-

21

-

8

+

FLANGE

NUT

:

PPCS.

Part to remov

Procedures

Remarks

Tool

Cylinder head

(1)

Remove rocker cover and gasket.

6

4

x

12mm Bolt

(2) Loosen lock nut for rocker arm

adjusting screw.

8

cJ5

Nut

---a

(3)

Slide off rocker arm shaft holder to the flywheel side, remove

rocker arms. (4) Remove (5)

Remove cylinder head and gasket.

10

cJ5

X

push

75mm Bolt

e.-

-

4pcs.

2~~s.

rods.(See

-

Fig.

4pcs.

from

31.)

the

Mark rocker arms and push

rods

so

they be reinstalled in their original positions.

lOmm ' Box

12mm

14mm

Box

wrench

6

+

FLANGE

BOLT

:

Fig.

30

I\

I'

ADJUSTING

8

4

ROCKER ARM

NUT

:

2pcs.

SCREW

Fig.

31

-

22

-

Step

16

17

-

Part to remov

Intake and exhaust valve

Breather

Procedures Remarks

(1)

Press -down spring retainer and slide Clean carbon and gum it to release

from

the groove

of

valve deposits from the valves,

stem, then remove spring retainer and

valve

seats,

ports and

valve spring.(See Fig.

32.)

guides. Inspect valves,

(2)

Remove intake and exhaust valves valve seats and guides. from

cylinder head.

(1)

Remove breather cover.

6

4

x

12mm Bolt

.-e-

2pcs.

Remove gasket

(

breather cover

)

,

breather plate and gasket (breather plate).

Tool

lOmm

Box

wrench

6

+

FLANGE BOLT

:

2pcs.

9

BREATHER COVER

e

GASKET (BREATHER COVER)

BREATHER PLATE

GASKET (BREATHER PLATE)

Fig.

32

INTAKE VALVE

VALVE SPRING

EXHAUST VALVE

SPRING RETAINER

VALVE GUIDE

OIL SEAL

Fig.

33

-

23

-

18

Oil filler Oil filter

Procedures

(1)

Remove and pull

bearing

(2)

Remove oil filter from oil filter

bracket using oil filter tool.

(3)

Remove oil filter bracket from main bearing cover.

8

6

cover.

X

45mm Bolt

4

X

30mm

out

bolt

oil filler from main

--e-

2pcs.

on

oil filler

I

Be

careful O-ring of oil filler.

Remarks

not

on

the bottom

to loose

~~

I

lOmm

~

I

12mm

Tool

Box

wrench

OIL

FILTER

Fig.

-

’

34

24

BOLT

:

2pcs.

-

Step

19

20

-

I

'art to remove1 Procedures

I

Remarks

I

Tool

Main bearing cover

(1) Remove keys from crankshaft prior to

removal of main bearing cover.

(See

Fig.

36.)

(2)

Remove main bearing cover.

(See

Fig. 37.)

8

q5 X 45mm Bolt

.-.-

7pcs.

Use

a soft hammer and evenly tap around outer surface of cover. Avoid damage to

oil

seal from crankshaft key

way.

Do

not loose crankshaft

and camshaft spacer.

12mm

Box

wrench

Oil pump

(1) Remove oil filter (Screen) from main

bearing cover.

6

4

x

12mm Bolt

---e

lpce.

6

q5

x

25mm

Bolt

-*-.

3pcs.

(Outer).

(2)

Remove holder (Camshaft).

(3)

Remove

oil

pump (Inner) and

oil

pump

10mm Box wrench

1Omm

Box wrench

6

+

FLANGE BOL

6

+

FLANGE BOLT : 3pcs.

HOLDER (CAMSHAFT)

OIL

PUMP

(INNER) MAIN BEARING

COVER

v

h8

+

FLANGE

BOLT

:

7pcs.

fig.

35

Fig.

36

Fig.

37

-

25

-

Step

Part to remove

-

21

Balancer

-

Camshaft

22

and tappets

Procedures

(1

1

Position piston at top dead center and

1

remove balancer

(1)

Remove camshaft

(See

Fig.

(2)

Remove tappets

40.)

and balancer

from

crankcase.,

from

crankcase.

2.

Remarks

To

prevent the

from getting

tappets

damages,

put the crankcase cylinder side down.

(See

Fig.

40.)

Tappet in their

must

be

original

installed

position.

Mark tappets prior to removal

to

prevent error.

Tool

fig.

39

Fig.

38

-

26

CAMSHAFT

Fig.

40

-

Part to remove Procedures

Step

-

23

24

Connecting

and

piston

Crankshaft

(1)

Remove connecting rod bolts and con

-necting rod cap. rod

8

q5

x

46mm

(2)

Turn crankshaft until piston dead center, push out connecting rod and piston assembly through top cylinder.

(3)

Remove clips and piston pin to remove connecting rod from piston.

(4)

Remove piston rings from piston.

(1)

Tap lightly on flywheel end crankshaft to rmove from crankcase.

(See Fig.

-

42.)

Bolt

2pcs.

is

at top

Remarks

Scrape deposits that might interfere with removal

of

end of cylinder.

of

off

all

piston from upper

carbon

12mm

Ring

Tool

Box wrench

expander

Fig.

42

PISTON RING

CRANKSHAFT^'

1

U

SPACER

”---@

Fig.

\

I

CONNECTING

41

\

8

+

BOLT

ROD

:

2pcs

CAP

-

27

-

5-

4

REASSEMBLY

0

PRECAUTIONS FOR REASSEMBLY

1)

Clean parts throughly before reassembly.

PROCEDURES

Pay most attention to cleanliness of piston, cylinder, crankshaft, connecting rod and bearings.

2) Scrape off all carbon deposits from cylinder head, piston top and piston ring

3)

Check lip of

oil

seals. Replace oil seal if the lip is damaged.

grooves.

Apply oil to the lip before reassembly.

4)

Replace all the gaskets with new ones.

5)

Replace keys, pins, bolts, nuts, etc.,

6)

Torque bolts and nuts to specification refering to the

7)

Apply

8)

Check and adjust clearances and end

oil to rotating and sliding portions.

if

necessary.

plays

“Table

of.

tightening

where specified in this manual.

torque”.

5-4-1

(1)

CRANKSHAFT

Install crankshaft on crankcase using an oil seal guide to avoid damage to crankshaft oil seal. (See

(2)

Install woodruff key for the flywheel on

Fig.

43.)

crankshaft.

-

28

-

5-4-2

PISTON AND

PISTON

RINGS

(1)

Install oil ring first, then second ring and top ring. Spread ring only

far

enough to

slip

over

piston and into correct groove. Use care not to distort

ring.(See

Fig.

45.)

Install all the rings with punched mark beside the gap

on

the top side.(See

Fig,.

46.)

e

TOP

RING

SECOND RING

OIL

RING

OPEN ENDS OF PISTON RING

I

Fig.

44

Fig.

45

5-4-3

PISTON

AND

CNNECTING

ROD

When installing piston

on

connection rod, match

the mark

"DF"

on

the

piston with the mark

''@DF"

on connecting rod.(See Fig.

47.)

Oil the small end of connection

rod

before

installing piston and piston pin.

Use

clips

on

both

side of the piston pin to

secure piston pin

in

position.

"N"

MARK

Fig.

46

Fig.

47

-

29

-

5-4-4

CONNECTING

ROD

(1)

Before installing the piston and connecting rod in the cylinder, oil the piston, piston rings and cylinder

wall.

(2)

Stagger the piston ring gaps

90

’

apart

around the piston.

(See

Fig.

48.)

Use a piston ring compressor when installing piston. Install piston and rod

with

the

*

@DF”

marks on flywheel side

of

the crankcase.

(See

Fig.

49.)

(3)

Turn crankshaft to bottom dead center, then

tap

lightly top of the piston until large end

of the

rod

meet crankpin.

(4)

Install connecting rod cap with the match mark

on

the main bearing cover side.

(Match this mark with the

one

on the left

side

of

connecting rod’s large end viewed

from main bearing cover side.)

(See Fig.

50)

-[NOTES]

(1)

Torque connecting

rod

bolts

to specifi

-

cation. Tightening Torque

:

225-275kg - cm

by

turning crankshaft

slowly.

(2)

Check

for

free rnovemont

of

connecting

rod

I

-SECOND

RING

.‘

*

TOP

RING

I

Fig.

48

I

PISTON

RING COMPRESSOR

~~ ~~

CONNECTING

I

Fig.

49

I

Fig.

50

-

30

-

5-4-5

BALANCER SHAFT

Position piston at top dead center and install

balancer

1

and balancer

2..

Align timing marks on the each gear.

First align timing marks on crankgear and

balancer

1.

Then align timing marks

on

balancer

1

and

balancer 2. (See Fig.

51.)

Incorrect timing

of

the gears will cause engine’s malfunction and breakage due to interference

of

the parts.

Fig.

51

5-4-6

TAPPET

AND

CAMSHAFT

(1)

Oil tappets and install in their original position. Push in

fully

to avoid damage during

camshaft installation.

(2)

Lubricate bearing surfaces

of

camshaft.

Align timing mark

on

crankshaft gear with timing mark on camshaft and install camshaft in the crankcase. (See

Fig.

52.)

Incorrect valve timing will cause engine’s malfunction.

Fig.

52

-

31

-

5-4-7

ADJUST CRANKSHAFT AND CAMSHAFT END

PLAY

Measure end play with the engine cold.(See

Fig.

53.)

End play

is

regulated

by

a selected thickness of adjusting shim located on the crankshaft and camshaft. Replacement

is

seldom needed unless the crankshaft, camshaft or main bearing cover have been

replaced.

n

@-ti"

MAIN BEARING

COVER

BALANCER

GEAR

Fig.

53

-

32

-

e

(1) Tap end of crankshaft slightly to shoulder shaft against main bearing at flywheel end.

(2)

Use a depth gauge and straight edge to measure the distance between the machined surface

(A)

of the crankcase

(3) Measure the distance between the machined face of the main bearing cover

surface of the main bearing’s inner race of boss for the plane metal bearing. Record this

(4) The compressed thickness

dimension

(5)

Subtract dimension 1 from dimension final dimension. Choose an adjusting shim that is 0-0.2mm (0-0.008in.) less than the final

dimension.

(6)

Tap end of camshaft slightly to shoulder shaft against bearing in crankcase.

(7)

Use a depth gauge and straight edge to measure the distance between the machined surface of the crankcase

(8)

Measure the distance between the machined face of the main bearing cover surface of the cam bearing thrust

(9)

Use the crankcase cover gasket dimension recorded earlier as dimension

(10) Subtract dimension 4 from dimension

dimension. Choose an adjusting shim that is 0.13-0.29mm (0.005-0.011in.) less than the finafl dimension for Choose an adjusting shim that for EH43V.

3.

EH30V

and the crankshaft gear surface

of

the crankcase cover gasket

(A)

and the camshaft thrust surface

(F).

and EH34V.

is

0.13-0.39mm (0.005-0.015in.l less than the final dimension

(D)

(EH30V

2

and then add dimension

Record this as dimension

5.

Add dimension

(B).

Record this as measurement 1.

and EH34V).

as

dimension 2.

is

0.26mm (0.Olin.). Record this

(E).

Record this

3.

(C)

and the outer

For

EH43V, use outer surface

3.

The result will be the

as

measurement 4.

(C)

and the outer

5.

3.

The result will be the final

as

Crankshaft and camshaft end play

I

Crankshaft Camshaft

Thickness

Crankshaft Shim Camshaft Shim

of

I

EH30V, EH34V

1

adjusting

EH30V, EH34V EH43V

0.6,

0-0.2

0.1

3-0.29

shims

0.6,

0.8,

0.8

1.0

(rnm)

(mm)

I

EH43V

0.1

1.6.

0.6,

3-0.39

1.8,

0.8

I

2.0

-

33

-

5-4-8

(1)

MAIN BEARING

COVER

Install oil pump, holder (Camshaft) and oil filter (Screen) on main bearing cover.

6

X

Holder (Camshaft) Tightening Torque

(2)

Lubricate oil seal and bearing surfaces. add

25mm Bolt 3pcs.

:

80-100kg- cm

a light film of oil on main bearing cover face to hold gasket in place. Place spacers chosen crankshaft

and

at

procedure

camshaft.

5-4-7

Use an oil seal guide when installing main bearing cover to avoid damaging seal. Align slot in oil pump rotor shaft with oil pump drive pin in end of camshaft.

(See

Fig.

55.)

Tap cover into place with a soft hammar. Main bearing cover

8

4

X

45mm Bolt 7pcs.

Tightening Torque

:

170- 190kg- cm

on

1

OIL

PUMP

HOLDER

.

OIL

\

Fig.

54

FILTER

/

I

Fig.

55

5-4-9

OIL

FILLER AND

OIL

FILTER

Install oil filler and gauge, oil filter and oil filter bracket on main bearing cover. Oil filter bracket Tightening Torque

5-4-10

BREATHER

8

@

X

45mm Bolt 2pcs.

:

170- 190kg- cm

Install gasket (Breather plate, Brown), breather plate, gasket (Breather cover, Green) and breather cover.

6

@

X

Breather cover

12mm Bolt

a-

2pcs.

-

34

-

5-4-11

(1)

(2)

(3)

(4)

INTAKE AND EXHAUST VALVE

Clean carbon and gum deposits from the valves, seats, ports and guides. Inspect valves, valve seats and valve guides.. Replace valves that are badly burned, pitted or warped. When installing valves in cylinder head. Oil valve stems and insert them into valve guide. Then place cylinder head on flat table, install washer, valve spring and spring retainer.

Valve guides should be replaced when valve

1"

"

for

stem clearance exceeds specifications (See

SERVICE

press clearance specifications and proper assembly. After replacing valves and valve guides, lap valves in place until a uniform ring shows around the face and wash cylinder head thoroughly.

DATA").

new

guides in. Refer to "Table

Draw valve guides out and

of

the valve. Clean valves,

VALVE

A-Valve Face Angle

B-Seat Angle C-Guide Inside Dia.

D-Valve Stem Outside Dia.

Clearance Between

AND

VALVE

C

And D

GUIDE

CLEARANCE

Intake

Exhuast

I

Intake

I

Exhuast

Table

t

45

6.600 - 6.622

6.535

-

6.522

-

0.050

-

0.056

-

7

mm

6.550

mm

6.544 mm

0.087

mrn

0.100mrn

-

35

-

5-4-12

(1)

CYLINDER HEAD

Clean carbon from combustion chamber and dirt from between the cooling fins. Check the cylinder head mounting face for distortion. SERVISE DATA”

1,

replace head.

If

distortion is greater than specification (See

(2) In reassembly use new cylinder head gasket.

(NOTES]

”

not install spark plug at this time. This will ease in

Do

assembly. When installing spark

Cylinder Head 10

4

X

Tightening Torque

Spark Plug Tightening Torque

75mm

plug,

torque to specification (See

Bolt

-0.

4pcs.

:

340--42089- cm

:

New Spark Pulg 120-150kg- cm Retightening 230-270kg- cm

5-4-

13

ROCKER ARMS AND

(1)

Install push rods in cylinder, make sure that

is

each rod

secured

in

PUSH

RODS

the depression on the

tappet.

(2) Install rocker arm shaft on the cylinder

head from flywheel side. Install rocker arms and spacer.

(3)

Position piston at top dead center and adjust tappet clearance.

-[NOTES]

Tappet clearance must be measured with engine cold.

:

Tappet clearance Tighten adjusting nuts firmly. Check operation of values shaft.

Remeasure tappet clearance.

0.085-0.1

15mm

by

turning crank-

turning

engine over for remainder

“SPECIFICATIONS”).

Fig.

56

of

(4) Install rocker cover and gasket.

6

4

X

Rocker cover

12mm Bolt 4pcs.

Fig.

5

7

-

36

-

5-4-14

(1)

L

I

(2)

(3)

CYLINDER

BAFFLE

Install spark plug Install exhaust manifold and gasket. Exhaust manifold Install cylinder baffle Cylinder baffle

6

8

4

X

8mm Bolt

etc.

Nut

****

2pcs.

*-*

4pcs.

5-4-15

(1)

(2)

5-

4-

(1)

CHARGE

COIL

Install charge coil on crankcase.

Charge coil

Clamp wires

Clamp

I6

6

FLYWHEEL

on

4

X

lOmm Bolt

20mm Bolt

crankcase.

*--

*

0-

1 pce.

2pcs.

6.4

X

Clean dust and oil from tapered portion of crankshaft and flywheel. Install flywheel on crankshaft and torque nut to specifications. Flywheel

(2)

Install rotating screen on flywheel. Rotating screen

5-

4-

17

IGNITION COIL

(1)

Install ignition coil Adjust flywheel magnet

16 4 Nut

-

lpce.

Tightening Torque

8

4

X

12mm Bolt

on

crankcase.

to

ignition coil air

:

850-950kg- cm

-*-

3pcs.

gap to specification, then tighten mounting bolts. Coil clearance Ignition Coil

(2)

Connect spark plug cable

(See

Fig.

:

6

58.)

0.3-0.5

q5

X

30mmBolt

mm

*

to

spark plug.

2pcs.

5-4-

18

6

q5

5-

4-

4

6

4

5-4-20

BLOWER

x

8mm Bolt

9

RECOIL STARTER

x

8mm Bolt 4pcs.

DIODE

HOUSING

*

4pcs.

RECTIFIER

Install diode rectifier and bracket Bracket, diode rectifier

6

@

X

Connect wires as shown on the wiring diagram.

(See Section

6 - 3.)

on

crankcase.

12mm Bolt

Fig.

58

*

2pcs.

-

37

-

5-4-21 ELECTRIC STARTER

8

4

X

30mm Bolt

*-e*

2 pcs.

Connect wires as shown on the wiring diagram. (See Section

6

-

3.)

5-4-22 MUFFLER

Replace gasket and install muffler on cylinder head.

Maffler

8

Nut

*--*

2pcs.

Tightening Torgue

:

180--220kg- cm

8

q5

X

16mm Bolt

****

1

pce.

5-4-23 CARBURATOR,

LINKS

AND

AIR

CLEANER

(1)

Install insulator and heat deflector on studs. Connect governor rod and rod spring to throttle shaft of carburetor, choke rod to choke shaft

of

carburetor. Then install

carburetor on studs. (See

Fig.

59.)

Fig.

59

(2)

Install gasket, air cleaner on studs.

EH30V, 34V

:

Install gasket with lips for air vent groove toward air cleaner.

CARBURETOR

SIDE

EH43V

:

Install as shown below.

Fig.

60

AIR CLEANER

SIDE

”-.

CARBURETOR

SIDE

AIR

CLEANER

SIDE

Fig.

61

-

38

-

5-4-24

AIR

CLEANER

Install cleaner base on studs, install bracket, cleaner.

Tighten the clamp for stop switch wire together with cleaner bracket

on

crankcase side.

Tightening Torque

:

EH30V,

34V

70-90kg- cm

Cleaner Base

6

4

Nut

*-*-

2pcs.

EH43V

Bracket Cleaner

6

q5

X

20mm Bolt

0-

lpce.

6

q5

X

lOmm Bolt

***-

lpce.

5-4-25

GOVERNOR

ADSUSTMENT

For

correct carburetor throttle opening and governor regulation, the govenor lever must be properly adjusted.

(1)

Install throttle lever control linkage on governor lever and choke shaft control rod in choke lever.

(2)

Hook spring

from

control bracket hole

(A)

to the hole (1,

2,

3)

in governor lever as

shown in Fig.

62.

Install bracket assembly

on

crankcase.

(3)

Install governor lever on governor shaft but

do

not tighten clamp screw.

(4)

Turn governor lever clockwise until throttle

valve in carburetor is opened fully. Hold lever in this position.

IMPORTANT

:

Check

that

governor lever

damp

screw

is

loose

so

governor shaft can

be

turned independently

of

lever.

(5)

Insert a screwdriver in slot at end of governor shaft. Turn clockwise

as

far as shaft can be turned. Tighten governor lever clamp screw.

1

10- 130kg- cm

EH43V

(3)

-

(A)

Fig.

62

I

Fig.

63

-

39

-

5-4-26

FUEL

TANK

Install fuel tank, connect fuel lines and clamp them.

Fuel Tank

6

@

X

90mm Bolt 2pcs.

6

@

X

35mm Bolt

*--*

lpce.

5-4-27

ENGINE

OIL

After complete reassembly, turn the engine over using recoil starter to check

for

any abnomal conditions or loose fitting parts. Review and check wiring. Fill crankcase with correct grade

of

oil.

Crankcase oil capacity

EH30V,

EH34V

:

1

lOOcc

EH43V

:

1300cc

5-4-28

CHOKE AND SPEED ADJUSTMNT

Operate the engine without load. Without moving the choke lever, turn speed contrc choke lever until it just contacts the choke lever adjusting screw. Use a tachometer

or

revolution counter to regulate the choke start position and high speed operating

revolution. Turn the adjusting screw in or out against the speed control lever until the desired

no

load

operating speed is obtained. This same position will be the start

of

the choke operation.

(See Fig.

64.)

GOVERNOR LEVER

CHOKE LEVER

GOVERNOR SPRING

ADJUSTING

SCREW

)1

lever toward

SPEED CONTROL LEVER

fig.

64

-

40

-

5-4-29

An engine that

TEST

REBUILT

has

ENGINE

been completely overhauled by having the cylinder rebored and fitted with a new piston, rings, valves and connecting rod should be thoroughly

RUN-IN

before being put back into service. Good bearing surfaces and running clearances between the various parts can only be established by operating the engine under reduced speed and loads for

short period

While the engine

of

time.

is

being tested check

for

leaks.

Make final carburetor adjustment and regulate

the

engine

I

operating speed. (See

Step

3

Step

4

Step

5

3.5

7.0

ps

Fig.

65.)

No

4.0

8.0

load

ps ps

a

oil

Table

Fig.

65

10

30

60

min.

min. min.

I

3,600

5.0

ps

10.0

ps

2

3,600

-

41

-

6.

MAGNETO

6-

1

Flywheel

Magneto

The ignition system

of

the

EH30/EH34.

and

EH43

is pointless flywheel magneto with automatic advancing characteristic. Being different from the breaker point

type

ignition system, this system

is

completely free from

such troubles as starting-up failure owing to dirty, burnt

or

corroded point surface. The electronic

automatic advancing ensures extremely easy starts and stable high performance at operating speed

by

advancing the ignition timing to the most suitable point.

6-2

BASIC THEORY

(1)

Revolution of the flywheel generates electricity on the primary side of the ignition coil, and the base current

I1

flows to the power transistor.

Current

I1

turns the power transistor

"ON"

and the electric current

Iz

flows.

Resister

Ignition Coil

Fig.

66

(2)

At lower engine revolution, when the flywheel reached the ignition point the low speed ignition timing controll circuit operates to run the base current

I3

to turn the signal transistor

A

"ON"

allowing the current

I1

to bypass as current

14.

At this moment the power trausistor turns

"OFF"

and the current

I2

is

abruptoy shut resulting

in the high voltage generated in the secondary coil which produces sparks

at

the spark plug.

(3)

At higher engine revolution, the advancing controll circuit operates

at

the ignition timing to

run the base current

15

to turn the signal transistor

B

"ON

allowing the current

I1

to bypass

as current

Is.

At

this moment the power transistor turns

"OFF"

and the current

Iz

is

abruptly shut resulting in the high voltage generated in the secondary coil which produces sparks at the spark plug. The operating timing

of

the advancing controll circuit advances in accordance with the increase

of

engine speed resulting in the advancing

of

ignition timing as shown in

Fig.

66.

-

42

-

KEY

SWITCH TYPE

12VOLT

BATTERY

MINIMUM

24AMP.HR.

I

-

DIODE

RECTIFIER

I

""""""""_

I

STARTER

SWITCH

AND

STOP SWITCH TYPE

~ ~~ ~~ ~ ~~

E

0

DIODE

RECTIFIER

U

I

-

!"_"""""""I

L

12VOLT

BATTERY

MINIMUM

24AMP.HR.

Fig.

67

r

[NOTE]

The parts and wiring outside

of

the dotted line are to be prepared

by

the original equipment

manufacturer.

-

43

-

7.

AUTOMATIC

DECOMPRESSION

SYSTEM

The decompression system operates to release compression

by

lifting up the exhaust valve

at

n

starting.

The release lever mounted on the camshaft has a flyweight at one end and

a

crescent cam at the other end. When starting the engine, the crescent cam juts out from the exhaust cam. The exhaust tappet rides over the crescent cam opening the exhaust valve to release compression.

LEVER

CRESCENT

EXHAUST

Fig.

68

When the crank speed reaches

a

certain revolution, the flyweight

of

the release lever moves outward

by

the centrifugal force turning the release lever to retract the crescent cam.

Thus

the exhaust

valve closes allowing

a

sufficient compression for the engine to start up.

/1

CRESCENT

CAM

EXHAUST

CAM

Fig.

69

LEVER

-

44

-

8-4

8-

The float chamber is located just below the carburetor body and, with maintains

OPERAUUON

4

-

I

FLOAT

a

AND

SYSTEM

CONSTRUCTION

(See

Fig.

constant fuel level during engine operation.

69.

and

40.)

a

float and

a

needle valve,

The fuel flows from the fuel tank into the float chamber through needle valve. When the fuel rises to

a

specific level, the float rises

;

and when its buoyancy and fuel pressure are balanced,

the needle valve closes to shut off the fuel, thereby keeping the fuel at the predetermined level.

I

BYPASS

JET

PILOT

THROTTLE VALVE

PILOT OUTLET

VALVE

I

r*

I

\L-

"i"""-

PILOT

c

AIR

JET

Fig.

"_

JI

WELL

-"IF

BODY

4

70

FLOAT

NEEDLE

Fig.

71

-

45

-

VALVE

8-1-2

PlLOT SYSTEM

The pilot system feeds the fuel to the engine during idling and low- speed operation. The fuel

is

fed through the main jet to the pilot jet, where it

is

metered, and mixed with the

air metered by the pilot air jet.

is

The fuel-air mixture

At

idling speed, the fuel

8-

1-3

MAIN

SYSTEM

fed to the engine through the pilot outlet and the bypass.

is

mainly fed from the pilot outlet.

The main system feeds the fuel to the engine at,’medium-and high-speed operation.

is

The fuel

air

jet is mixed with the fuel through the bleed holes atomized out of the main bore. It an optimum fuel-air mixture, which

8-

1

-4

The choke is used for easy start when engine

metered by the main jet and fed to the main nozzle. The air metered by the main

in

the main nozzle, and the mixture

is

CHOKE

mixed again with the

is

supplied to the engine.

is

cold. When the starter is operated with a closed

air

taken through the air cleaner into

choke, the negative pressure applied to the main nozzle increases and draws much fuel accordingly thus easily start up the engine.

8-

2

DISASSEMBLY AND REASSEMBLY

Apart from mechanical failures, most of carburetor troubles ratio, which may arise mainly due to a clogged up air variations. In order to assure proper flow of

air

and fuel, the carburetor must be kept clean

all times. The carburetor disassembly and reassembly procedures are

are

caused by ‘an incorrect mixing

or

fuel passage in jets, or fuel level

as

follows : (See Fig.

71.)

/”.

is

;

at

8-2-1

(1)

(2)

THROTTLE SYSTEM

Remove the philips screw

11,

valve (1 The spring

and pull out the throttle shaft

(17)

can be taken out by removing

the throttle stop screw

(16).

(

10)

and throttle

*Exercise care not to damage throttle valve

ends.

8-2-2

(I)

(2)

CHOKE SYSTEM

Remove the

(131, and pull out the choke shaft

philips

screw

(14)

and choke valve

(31).

When reassembling the choke shaft, make

that the cutout in the choke valve faces. the main air jet. Meantime, when reassembling set the rings

(34)

(32) and

8-2-3

PILOT SYSTEM

Remove the pilot jet

to avoid damage to

at the right position.

(181,

it.

using correct tool

Reassembly

Tighten the pilot jet securely. Otherwise, the

fuel

may

leak, causing engine malfunction.

(30).

sure

Fig.

28

29

72

-

46

8-2-4

(1)

(2)

(3)

MAIN

Remove the

SYSTEM

bolt

From the body main nozzle

(19).

Reassembly

(29)

and take out float chamber body

(1)

remove the main nozzle

(26).

(19),

and then remove the main jet

(20)

a) Fasten the main jet securely to the body. Otherwise, the fuel may become too rich and

cause engine malfunction.

b) The bolt tightening torque

is

7Okg-cm.

from the

8-2-5

(1)

When cleaning the jets, use neither orifice which will adversely affect fuel flow). clean.

(2)

FLOAT

Pull out the float pin

SYSTEM

(36)

and remove the float (27) and needle valve

a

drill nor a wire (because of possible damage of the

Be

sure

to

use compressed air to blow them

When removing the needle valve and floats, gently tap the reverse side using the rod more

slender than the float pin and remove, since the float

pin-is

calked to the carburetor body.

(35).

-

47

-

9.

STARTING

SYSTEM

9-

1

RECOIL

STARTER

When repairing recoil starter, disassemble and reassemble in the following procedures.

Tools

:

Socket wrench, Needle nose pliers, Screw driver

9-

1

-

1

DISASSEMBLYH

(1)

Remove recoil starter from engine.

(2)

Pull starter knob and pull out starter rope for 30-40cm to line up notch on reel with outlet hole for starter rope. Hold reel with thumb and pull starter rope

inside starter case with screw driver.

(See Fig.

73.)

Rewind reel clockwise until the rotation

stops.

When rewinding the reel, control the

rotation

by

holding starter rope using the notch on the reel and pressing the reel with thumb.

(3)

Remove parts in the following order.

1.

Nut

2.

Spring washer

3.

Thrust washer

4.

Thrust washer

B

5.

Friction plate

6.

Return spring

7.

Friction spring

8.

Ratchet.

Fig.

73

Fig.

74

-

48

-

(4)

Remove reel from starter case as shown in

Fig.

75.

Take out reel slowly turning it lightly toward left and right to remove spring from the hook.

Do

not remove the reel quickly

or the spring may escape from the starter

If

case. starter case as instructed

the spring escapes, put it in the

in

9-

1

Untie starter rope from the knob and remove.

9-

1

-2

REASSEMBLY

(1)

Put

starter rope through starter knob and

tie

it

as shown in

Fig.

76.

(Tie the rope

tightly for the safety sake,)

Put

the opposite side

starter case and reel. Tie

of

the rope through

it

in the same way

as starter knob end and put the knot

reel

complely.

(2)

Check that spring is securely set in the starter case. Adjust the position of inner end

spring

so

it hooks

on

hook

on

securely. The shape of starter spring inner end canbe adjusted with plier if necessary.

-

3.

in

of

the reel

the

I

REEL

INNER

END

OF

Fig.

76

SPRING

75

REEL

/

HOOK

STAR

OUTER

Fig.

-

49

-

77

END

OF

SPRING

(3)

Prior starter rope in reel for arrowhead direction as shown in Then let the rope out of reel on reel. Line up reel of spring as shown in Fig.

to

installing reel in starter case, wind

1.5

turns in the

Fig.

from

the notch

hook

with inner end

77

and install reel in starter case. Hold starter rope as shown in

6

turn reel Firmly press pull starting

times in the arrowhead direction,

not

to

allow reverse turn and

knob

to let starter rope out

Fig.78

of starter case. Return knob slowly to let starter rope rewind in reel.

(4)

Reassemble parts in reverse order disassembly. When installing friction plate, put return spring into the slit

of

friction plate and

rotate the plate in the arrowhead direction

79

as shown in Fig.

until notch of the plate

lines up with ratchet. Press friction plate firmly toward reel, install thrust washers, spring washer and nut.

78.

and

of

L

Fig.

78

(5)

Test operation of recoil starter to

see

if rope recoils satisfactorily and ratchets project and

retract properly. Mount recoil starter to the engine.

Fig.

79

3TCH

.

-.

-

50

-

(6)

If spring escapes from starter case when

disassembling recoil, recoil and assemble in the following manner.

a) Make

thin wire the one

a

spring

of

holder

of

which diameter

for

the spring with

is

smaller than

spring housing in starter case

and twist the end together.

Wind the power spring inside the wire ring

of

starting with the outer loop

(See Fig.

b)

Place the spring assembly over the recess in the housing, outer loop in the housing (See

80.)

of

so

that the hook in the

the spring

Fig.

77.)

the spring

is

over the tab

Fig.

80

Carefully press the spring out the wire ring and into the recess in the housing.

(7)

Lubricate the rotating parts, sliding parts and spring with heat resistant grease or mobile

oil

when reassembling recoil and prior to long term storage.

-

51

-

9-2

9-

(1)

(2)

(3)

ELECTRIC STARTING

2

-

1

DISASSEMBLY

The 6mm terminal nuts Remove the

"M"

terminal bush

6mm

The 5mm through bolts Remove the

"M"

The rear cover the

5mm

through bolts.

terminal nuts.

No,l

terminal bush

is

disassembled

MOTOR

(2pcs.)

No,

by

removing

(OPTION)

1.

Fig.

81

(4)

The rear cover Remove the rear cover.

Fig.

82

I

Fig.

-

52

-

83

4

/

3

(5)

The 4mm screws (2pcs.I

(6)

The brush holder.

(7)

"M"

terminal bush

No,

2.

The

brush

holde

is

disassembled by

re-

moving the

4

mm screws. (2pcs.I

Remove the

"M"

terminal

bush

No,

2.

(8)

Yoke assembly. Remove the yoke assembly.

(9)

The pinion stopper clip. The pinion stopper clip is removed with

a

standard screwdriver while the pinion stopper

is

pushed toward the

pinion.

6

7

Fig.

84

Fig.

85

Fig.

86

-

53

-

(lo)

Pinion stopper.

(1

1)

Pinion return spring.

(

12)

Pinion assembly. The pinion stopper, pinion return spring

and

the pinion assembly can be dis assembled once the pinion stopper clip has been removed.

(13)

Armature.

(14)

Thrust washers

(15)

Front

cover.

The armature, thrust washers cover and the

(4pcs.)

yoke

(~Pcs.),

assembly can be

disassenbled once the rear cover.

front

12

11

-

Fig.

87

15

\

Fig.

88

-

54

-

9

11

\L

8

1

2

7

>

5

01111111)

6

i

3

4

1.

The 6mm terminal nuts (2pcs.)

2.

"M"

terminal bush

3.

The

5mm

4.

The Rear cover

5.

The 4mm screws

6.

The brush holder

7.

"M"

Terminal bush

8.

Yoke assembly

through bolts (2pcs.)

No,l

(2pcs.)

No,

2

Fig.

89

9.

The

pinion

10.

Pinion stopper

1 1.

Pinion return spring

12.

Pinion assembly

13.

Armature

14.

Thrust washers

15.

Front cover

-

55

-

stopper clip

(4pcs.)

9-

2-2

INSPECTION

(1

)

ARMATURE

AND

REPAIR

a) Check the diameter of the commutator.

of

If the out side diamaeter

is

tator replace

I

Standard

below

it.

the minimum limit then

(New)

I

the commu-

Unit

Limit (Used)

:

rnrn

I

30

b)

Continuity test for the armature coil.

a

Use

tester to check for continuity

29

between parallel points on the commutator.

If

There

is

continuity, the armature is still

good. No

continuity : (Disconnected coil)

Replace the armature.

I

I__

TESTER

Fig.

90

91

c) Insulation

Use

test

for the armature coil.

21

tester to check for continuity between a point on the commutator and the shaft or the core. If There is no continuity, the armature still

good.

Continuity exists : (Short circuited coil)

Replace the armature.

is

-

I

TESTER

r

I

1-1

Fig.

92

56

-

d)

Check for Surface Distortion

on

the Armature and the Commutator. Use

a

dial gauge to measure the distortion

of

the out side surfaces of the armature

core and the commutator.

If it

is

above

the

limit, then repair

or

replace

it.

Unit

:

mm

I

Standard

(New)

I

Limit

(Used)

I

Armature

I

0.05

(Max.)

I

0.1

(Max.)

I

8

Q

COMMUTATOR

I

Commutator

I

0.05

(Max.)

I

0.1

(Max.)

I

Fig.

93

e) Check the Surface of

the

Commutator.

If

the commutator surface

is

rough, then

please use

No,

500-600

sandpaper to make

it

smooth.

f)

Check the Depth

of

the Insulating Material from the Commutator Surface. If

the

depth

of

the insulating material from

the commutator segments

is

less than the

limit, then please repair

it

by

filing it

down.

Unit : mm

I

Standard

(New)

Limit

(Used)

I

0.5-0.8

I

0.2

(Min.)

I

fig.

94

INSULATOR

w

0.5-0.8

mm

COMMUTATOR

SEGMENTS

CORRECT

INCORRECT

I

Fig.

95

-

57

-

(2)

BRUSH

Measure the length of the brushes and

if

they are under the limit, replace them.

Unit

:

mm

I

Brush

I

Standard

(New) I Limit (Used)

I

1

Positive side

brush

I

1

2.5

191

I

Negative

side

brush

I

1

2.5

191

(3)

BRUSH

HOLDER

a)

Insulation Test for the Brush Holder.

Check for continuity between the brush

holder's top (Positive side) and its base

(Negative side). If there is no continuity

then it is still good.

Continuity Exists

:

(Unsatisfactory

Insulation) Replace the brush holder.

b)

Inspection of the Brush Springs. Check the weight of the brush springs.

I

Standard weight (kg)

I

1.4-1.8

I

Fig.

96

Fig.

97

I

Fig.

98

-

58

-

(4)

PINION

CLUTCH

Inspection

of

the pinion clutch.

Rotate the pinion manually. While rotating

it

in

the direction of normal operation,

smoothly reverse the direction

of

rotation

to confirm that

it

locks.

In the event

of

any irregular

'ity, replace it.

Fig.

99

9-

2

-

3

REASSEMBLY

Reassembly

is

in the revrse order

of

disassembly, however please note the following points.

(1)

The Places

to

Apply Grease

:

The sliding surfaces of the pinion and the shaft's spline.

The metals holding the shaft at the

front

and rear covers.

-

59

-

10.

TROUBLESHOOTING

The following three conditionts must be fulfilled

1.

The cylinder filled with a proper fuel-air mixture,

2.

Good compression in the cylinder.

3.

Good

spark,

properly timed, to ignite the mixture.

for

satisfactory engine start.

The engine cannot be started unless these three conditions are met. There are also other factors

g.,

which make engine start difficult, e.

at

low

speed, and

a

high back pressure due to

a heavy load on the engine when

a

long exhaust pipe.

The most common causes of engine troubles are given below

1

0-

1

STARTING

10-1

-

1

FUEL

(1)

No

gasoline in the fuel tank

(2)

The carburetor

(3)

Water, dust

(4)

Inferior grade gasoline or poor quality gasoline fuel-

air

mixture.

(5)

The carburetor needle valve

DIFFICULTIES

SYSTEM

is

not choked sufficiently, especially when the engine

or

gum

;

or the fuel cock closed.

in the gasoline interfering the fuel flow to the carburetor.

is

not vaporized enough to produce the correct

is

heldopen by

dirt

or gum. This trouble can be detected

:

is

it

cold.

is

about to start

the fuel flows out of the carburetor when the engine is idling.(Overflow) This trouble may

be

remedied, depending on cases, by lightly tapping the float chamber with

the grip of a screwdriver or the like.

(6)

If the carburetor overflows, excessive fuel runs into the cylinder when starting the engine,

to

making the fuel- air mixture too rich turn the starting pulley

a

few

turns

in

pulg hole into the atmosphere. Keep the carburetor choke open during this operation.

it

spark plug well, screw

into place, and

burn. If this happens, remove the spark plug, and

order to let the rich fuel-air mixture out of the spark

Dry

try

to start again.

/”-

as

Y

the

10-

1-2

COMPRESSION

If

starting difficulties and

SYSTEM

loss

of

power are not due to the fuel system

followings must be checked for possible lack of compression.

(1)

Engine inside is completely dried

(2)

Loose or broken spark plug. This causes

of

cylinder in compression stroke during cranking.

(3)

Damaged head gasket or loose cylinder head.

up

because

a

hissing noise made by mixture gas running out

of

a

long period

A

similar hissing noise is produced during

compression stroke.

(4)

Incorrect valve clearance If the correct compression engine and check further

a)

Valve stuck open due to carbon

b)

If

the piston rings are stuck on the piston, remove the piston and connecting rod from

is

not obtained even after remedying the above, disassemble the

as

follows

or

:

gum

on

the valve stem.

the engine. Clean or replace the parts.

of

or

ignition system, the

storage.

-

60

-

0)

10-

1

-

3

lGNlTlON

Check the followings for lack

(1) Leads (2)

Ignition coil damaged and shorted.

(3)

Spark plug cable wet or soaked with oil.

(4)

Spark plug dirty or wet.

(5)

Spark plug electrode gap incorrect.

(6)

Spark plug electrodes are connected

(7)

Incorrect spark timing.

(1)

Incorrect spark plug electrodge gap. Adjust it to anywhere between

(2)

Ignition cable worn and leaking.

(3)

Sparks weak.

(4)

Ignition wire connections loose.

(5)

Water in gasoline.

(6)

Insufficient compression.

of

SYSTEM

of

sparks.

the ignition coil, spark plug or contact breaker disconnected.

or

bridged.

0.7

and

0.8mm.

10-3

ENGINE

STOPS

(1) Fuel tank empty. Water, dirt, gum, etc. in gasoline.

(2)

Vapor lock,

(3)

VaDor lock in the fuel lines or carburetor due to the use of

i.

e., gasoline evaporating in the fuel lines due to overheat around the engine.

too

volatile winter

hot season.

(4)

Air vent hole in the fuel tank cap plugged.

(5)

Bearing parts seized due to lack of oil.

(6)

Magneto or ignition coil faulty.

10-

4

ENGONE

(1)

Crankcase oil level low. Add

(2)

Spark timing incorrect.

(3)

Low grade gasoline

(4)

Cooling

(5)

Cooling air path misdirected causes loss of cooling efficiency.

(6)

Cylinder head cooling fins clogged up with dirt.

(7)

Engine operated in an enclosed space without sufficient cooling air.

(8)

Exhaust gas discharge restricted,

(9)

Engine running on low-octane gaoline detonates due to heavy load at low speed.

OVERHEATS

is

air

circulation restricted.

oil

immediately.

used, or engine

or

carbon deposits in the combustion chamber.

is

overloaded.

gas

in the

-

61

-

10-5

ENGINE KNOCKS

(1)

Poor quality gasoline.

(2)

Engine operating under heavy load at

low

speed.

(3)

Carbon

or

lead deposits in the cylinder head.

(4)

Spark timing incorrect.

(5)

Loose connecting

rod

bearing due

to

wear.

(6)

Loose

piston pin due to wear.

(7)

Cuases

of

engine overheat.

10-

6

ENGINE BACKFIRES THROUGH CARBURETOR

(1)

Water

or

dirt in gasoline,

or

low-grade gasoline.

(2) Intake valve stuck.

(3)

Valves overheated,

or

hot carbon particles in the combustion chamber.

(4)

Engine cold.

-

62

-

11.

INSTALLATION

Engine life, ease of maintenance and inspection, frequency of checks and repairs, and operating cost all depend on the way in which the engine

is

installed. Carefully observe the following

instructions for installing the engine.

11 - 1

INSTALLING

When mounting the engine, carefully examine

its

position, the method of connecting it to a machine, the foundation, and the mehtod of supporting the engine. When determining

its

mounting position, in particular, make sure that gasoline and oil can easily

be supplied and checked, the spark plug can easily

be

checked, the air cleaner can easily be serviced,

and that the oil can easily be discharged.

11

-

2

VENTJLATION

Fresh air

is

necessary for cooling the engine and burning the fuel.

In

the. case the engine is operated under

a

hood

or

in a small room, temperature rise in the engine

room can cause vapor lock, oil deterioration, increased oil consumption, loss of power, piston seizure,

shorter engine life, etc., making it impossible to operate the engine properly. It

is

necessary,

therefore, to provide

a

duct or baffle

to

guide cooling air to the engine to prevent recirculation of the hot air used for engine cooling, and temperature rise of the machine. Keep the engine room temperature below

50°C

even in the hottest period of the year.

11

-3

EXHAUST GAS DISCHARGE

Exhaust

gas

is

noxious. When operating the engine indoors, be sure to discharge the exhaust gas

outdoors. If a long exhaust pipe

is

used in such a case, the internal resistance increases causing

loss

of engine power. Thus pipe inside diameter must be increased in proportion to exhaust pipe

length.

Exhaust

pipe

:

Less than 3m long, pipe inside diameter 30mm, Less than 5m long, pipe inside diameter 33mm.

11

-4

POWER TRANSMISSION

TO

DRIVEN MACHINES

11

-4-

1

BELT

DRIVE

Take the following notes into consideration.

*

V-belts are preferable to flat belts.

*.The driving shaft of the engine must be parallel to the driven shaft of the machine.

*

The driving pulley of the engine must be in line with the driven pulley of the machine.

*

Install the engine pulley as close to the engine as possible.

*

If possible,

span

the belt horizontally.

*

Disengage the load when starting the engine.

If

no clutch is used, use a belt tension pulley or the like.

11

-4-

2 FLEXIBLE

COUPLING

When using a flexible coupling, runout and misalignment between the driven shaft and engine shaft must be minimized. Runout and misalignment tolerance are specified by the coupling manufacturer.

-

63

-

12.

SERVICE

DATA

12-1

I

CLEARANCE

CYLINDER HEAD

.Valve seat

Valve guide inside dia.

contact

DATA

width

ITEM

AND

LIMITS

IN.

~

EX.

~~~~ ~~~~~

T

EH30V/EH34V/EH43V

0.05

(0.002)

Unit

0.1

(0.004)

2.0

(0.079)

:

mm

(in)

6.600-6.622

(0.260-0.261)

6.75

(0.266)

-

64

-

Unit : mm

(in)

ZYLINDER

B

Inside

dia.

ITEM

EH30V

EH34V

~

STD

1

st

reboring

2nd

reboring

STD

1

st

reboring

STD

78.000-78.01 (3.07 1 -3.072)

78.250-78.269

(3.081

-3.082)

78.500-78.51 9

(3.091 -3.092)

84.000-84.022

(3.307-3.308)

84.250-84.272 (3.31 7-3.31 8)

9

Limit

To

be rebred

lifference between max.

3nd

rnin

.

of diameter

,cached

to

0.1

Ditto

when

(0.004).

the

Out

of

rowdiness after

reboring.

Cylindricity after reboring.

EH43V

EH30V EH34V EH43V

2nd

reboring

STD

1

st

reboring

2nd

reboring

84.500-84.522 (3.327-3.328)

89.000-89.022

(3.504-3.505)

89.250-89.272 (3.51 4-3.51

89.500-89.522 (3.524-3.525)

0.01 (0.004)

0.0 1 5

(0.0006)

5)

Ditto

-

65

-

Unit

:

rnm

(in)

PISTON

Piston

thrust

size

(At

direction)

I

Ring groove side clearance

I

skirt.

ITEM

in

#

EH30V

EH34V

EH43V

1st

2nd

1st

2nd

1st

2nd

STD

o/s

STD

o/s

STD

o/s

Tor,

STD

77.96-77.98

(3.069-3.070)

78.2

1

-78.23

(3.079-3.080)

78.46-78.48

(3.089-3.390)

83.98-83.98

(3.305-3.006)

84.2

1

-84.23

(3.31 5-3.31 6)

84.46-84.48

(3.325-3.326)

88.96-88.98

(3.502-3.503)

89.21 -89.23

(3.51 2-3.51 3)

89.46-89.48

(3.522-3.523)

0.05-0.09

(0.002-0.0035)

Limit

77.87 (3.066)

78.1 2 (3.076)

78.37 (3.085)

83.87 (3.302)

84.1 2 (3.3

84.37 (3.322)

88.87 (3.499)

89.1 2 (3.509)

89.37 (3.51

1

2)

9)

0

Piston

hole

.m

0

Piston

Clearance between piston and cylinder at

skirt

outside dia.

area.

2nd

Oil

EH30V

ring

0.03-0.07

(0.001

2-0.0028)

0.01 -0.065

(0.0004-0.0026)

20.995-21.008

(0.8266-0.8271

20.991 -21

(0.8264-0.8268)

0.025-0.064

(0.001

.OOO

0-0.0025)

0.1

5

(0.006)

)

21.035 (0.828

20.960 (0.8251

1

)

EH34V EH43V

-

0.025-0.067

(0.001

66

-

0.25 (0.0098)

0-0.0025)

Unit

:

mm

(in)

ITEM

STD

Limit

*.Clearance between piston and piston

pin.

-

0.005-0.01 7

(-

0.0002-0.0007)

0.06

(0.0023)

Piston ring end gap

TOP

2nd

0.2-0.4

(0.0079-0.01 57)

1.5

(0.059

1

)

0.1

-0.3

(0.0004-0.01

18)

Oil

ring

CONNECTING

ROD

Big

end inside dia.

(Metal is fitted)

0"

38.000-38.01 6

(1.496

1

-

1.4967)

38.1

(1.5000)

Clearance between big end and- crankpin

0.030-0.060

(0.001

2-0.0024)

0.2

(0.0079)

@

Small end inside dia.

21.01 0-21.023

(0.8272-0.8277)

2 1.080

(0.8299)

Clearance between small

end

and piston

0.01

0-0.032

(0.0004-0.001

3)

0.1 2 (0.0047)

Big

end side clearance

"CCIC

0.1

-0.3

(0.0039-0.01 18)

1

.O

(0.0394)

-

67

-

Unit

:

mm

(in)

I

CRANKSHAFT

Crankpin outside dia.

Journal dia.

I

RI

Clealance between journal and main bearing

I

ITEM

R2

I

Flywheel

side

R1

P.T.0

side

R2

Flywheel

side

STD

37.956-37.970

(1.4943-

34.986-34.997

(1.3774-

34.986-34.997

(

1.3774- 1 -3778)

-

1

-4949)

1

-3778)

0.009-0.01

(-

0.00035

-

0.00055)

37.85 (1.4902)

4

Limit

EH43V

STD

37.956-37.970 (1.4943- 1.494)

34.986-34.997

(1.3774- 1.3778)

34.984-35.000

(1.3773- 1.3780)

-

0.009-0.01 4

(

-

0.00035

-

0.00055)

Limit

37.85 (1.4902)

CAMSHAFT

Cam

height

Journal outside dia.

ITEM

P.T.0

side

-

0.009-0.01 4

(

-

0.00035

-

0.00055)

IN

.

EX

.

cams

T

36.

(1.421

STD

1-36.3

3- 1.4291

0.01

4-0.096

(0.00055-0.0038:

)

Unit

Limit

35.95 (1.41 54)

~

:

mm

(in)

Flywheel side

1

9.967- 1 9.980

(0.7861 -0.7866)

-

68

-

19.950 (0.7854)

Unit

:

mm

(in)

ITEM

STD

Limit

VALVE

e

Valve stem outside dia.

6.535-6.550

(0.2573-0.2579)

6.450 (0.2539)

IN.

6.522-6.544

(0.2568-0.2576)

6.450 (0.2539)

EX.

Clearance between valve stem dia. and

valve guide

0.30

(0.01 18)

0.050-0.087

(0.0022-0.0034)

~ . . . . ..

..

'3

:

.:

. ..

IN.

0.056-0.1

00

(0.0022-0.0039)

EX.

0.30

(0.01

18)

e

Valve clearance

IN./EX.

(cold)

Adjustable

0.085-0.1 15

(0.0034-0.0045)

TAPPET

8.960-8.975

(0.3528-0.3533)

8.93 (0.351

6)

Guide inside dia.

9.00-9.01

5

(0.3543-0.3549)

9.08 (0.3575)

e-

*

Tappet guide clearance

0.025-0.055

(0.001

0-0.0022)

0.1 5 (0.0059)

-

69

-

Unit

:

mm

(in)

ITEM

ROCKER

ARM

Rocker shaft outside dia.

Rocker arm hole

dia.

Rocker arm shaft

C+&

..

.

:.:.

..

.....

..:

.

VALVE

SPRING

FREE

-LENGTH

~~ ~~

VALVE SEAT ANGLE

(IN.

EX.)

Valve cutter angle

(a)

Valve contact width

(b)

v

a

STD

1

1.986- 1 1.994

(0.471 9-0.4722)

1

2.006-

1

2.024

(0.4727-0.4734)

0.01

2-0.038

(0.0005-0.001

5)

39.5

(1.5551)

a

:

90"

b

:

0.7-1.0

(0.028-0.039)

Limit

1

1.92

(0.4693)

12.07

(0.4752)

0.1

5

(0.0059)

2.0

(0.079)

-

70

-

1

2

-

2

TORQUE SPECIFICATIONS

DESCRIPTION

TIGHTENING TORQUE

Cylinder head bolts

850-950kg- cm (61.5-68.7

ft

Ib)

Flywheel nut

225--275kg- cm (16.3-

19.9

ft

Ib)

Connecting

rod

cap bolts

340-420kg-cm (24.6-30.4

ft

Ib)

I

Main bearing cover bolts

1

170-190kg-cm (12.3-13.7

ft

Ib)

Spark plug

I

New spark plug

I

120-150kg- cm

(8.7-10.8

ft

Ib)

I

Retightening

1

230-270kg- cm (16.6- 19.5f

ft

Ib)

12-3

OIL

GRADE CHART

Single

Specified grade Lubricant

Quality

Comparison between

oil

viscosity

and

temparature

L

1

I

#

40

I

Multi-

grade

1OW-30

-

20

-

10

0

-4

14

32

10

50

20

68

30

86

40

"C

104°F

Use oil classified as SC or higher. Multi-grade oil tends to increase its consumption at high ambient temperature.

-

71

-

13.

MAINTENANCE AND STORAGE

The following maintenance jobs apply when the engine

is

operated correctly under normal conditions. The indicated maintenance intervals are by no means guarantees for maintenance free operations during these intervals.

For

example,

if

the engine

is

operated in extremely dusty conditions, the air cleaner should be

cleaned every day instead of every

50

hours.

13- 1 DAILY*MAlNTENANCE

MAINTENANCE

1) Clean away dust and chaff from engine.

2)

Check fuel leakage from fuel

system.

Lf

any, retighten fasteners

or

replace necessary

parts.

3)

Inspect for loose hardwares and retighten

if

necessary.

4)

Check oil level and add to full

mark.

REMARKS

Governor linkage is especially sensitive

to

dust.

Loose bolts and nuts may come off and result in breakage

of

other

parts.

13-2 INITIAL

20

HRS. MAINTENANCE

I

MAINTENANCE

REMARKS

1)

Change crankcase oil.

To

remove sludge from run-in operation.

13-3 EVERY

50

HRS. (10 DAYS) MAINTENANCE

MAINTENANCE

I

1) Change crankcase oil.

REMARKS

Contaminated oil quickens wear.

I

3)

Check and clean spark plug.

I

If

dirty, wash in gasoline

or

polish with emery paper.

-

72

-

13-4

EVERY

400"200

HRS.

(

AINTENANCE

MAINTENANCE REMARKS

1)

Clean fuel filter and fuel tank.

2)

Inspect cooling system and remove Remove blower housing and clean up between fins and dirt and chaff.

13- 5 EVERY

I

1)

Remove carbon from cylinder Carbon deposits in combustion chamber causes lack head.

I

2)

Disassemble and clean carburetor.

500"600

MAINTENANCE

HRS.

MAINTENANCE

housing.

I

power.

REMARKS

I

of

MAINTENANCE

1)

Overhaul engine. Clean and correct parts.

Replace piston rings and other necessary parts.

I

2)

Replace fuel lines once a year.

I

13-

7

ENGINE

(1)

Perform the above

(2)

Drain fuel from the fuel tank and carburetor float chamber.

(3)

To

prevent rust in the cylinder bore, apply oil through the spark plug hole and turn the

crankshaft several turns by hand. Reinstall the plug.

(4)

Turn the starting pulley

(5)

Clean outside

(6)

Put a plastic cover or the like over the engine and store the engine

STORAGE

13- 1 and

by

hand and leave

of

the engine with oiled cloth.

13-

I

Avoid hazards caused by fuel leakage.

I

2

maintenance jobs.

it

REMARKS

where the resistance is the heaviest.

in

dry place.

I

-

73

-

Industrial

Engines