Robin EH17, EH25, EH12 User Manual

ROBIN

AMERICA, INC.

ROBIN

TO

WISCONSIN

ROBIN

ENGINE

MODEL

CROSS REFERENCE

LIST

ROBIN

EY08

EY15 EY 15V EY20 EY2OV EY23

EY28

EY3

5

EY40

-

EY45V EY2

1

EY44 EY 18-3 EY25 EY27

EH11 EH12

EH15

EH17 EH21

EH25

EH30 EH30V EH34 EH34V EH43V

EC13V

DY23 DY27 DY30 DY3

5

DY4 1

WISCONSIN

ROBIN

SIDE

VALVE

W

1-080

W1-145 W1-145V W1-185 W1-185V W1-230 W 1-280

W

1-340 W 1-390 Wl-45OV EY21W EY44W EY18-3W EY25W EY27W

OVERHEAD

VALVE

WO1-115 wo1-120 WO1-150 WO1-170 wo1-210 WOl-250 WO 1-300 WO1-300V WO1-340

WO

1

-340V

WO 1-43 OV

TWO CYCLE

WT1-125V

DIESEL

WRD

1-230

WRD

1-270

-1-300 WRD1-350 WRD1-410

0

NTEN'TS

Section Title Page

1

.

2

.

3

.

4

.

5

.

6

.

7

.

8

.

SPEClFlCATlONS

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

PERFORMANCE

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

2-1 Maximum Output

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

2-2 Continuous Rated Output

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

1 4 4 4

4

5 8

GENERAL

DESCRlPTlON

OF ENGINE COMPONENTS

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

8

2-3

M~~~~~~T~~~~~

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

2-4

performance

curves

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

FEATURES

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

4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-1

0

4-1 1 4-1

2

4-1 3 4-1 4 4-1

5

13-1 13-2 13-3 13-4 13-5 13-6 13-7

..

"

1.

SPECIFICATIONS

Model

~~ ~~ ~

EH12B EH12DS

EH12BS

EH12

EH12D

TY Pe

X

Bore

Piston Displacement

Compression Ratio

output

Stroke

Continuous

Max.

Torque 0.76/2600 kg*m/rpm

of

Direction Cooling system Forced Air Cooling Valve Arrangement Overhead Valve

Lubrication

Lubricant Automobile Oil Capacity

Fuel

Rotation Counterclockwise

of

Lubricant

Air-Cooled, 4-Cycle, Single-Cylinder. Horizontal P.T.O. Shaft, Gasoline Engine

60

X

43 mm (2.36 X 1.57 in.)

121

cc

(7.38 cu.in.)

8.5

4.0/2000 HP/rpm

/

1300 kgm/rpm

1.52

As

Viewd From P.T.O. Shaft Side

Splash Type

SAE

#20, #30

0.6 liters (0.16

Horizontal Draft, Float Type Carburetor

Automobile Gasoline

2.5/3000 HP/rprn 2.813600 HP/rpm 2.5/1500 HP/rpm 2.8/1800 HP/rpm

U.S.

or

gal.)

4.0

/4000 HP/rpm

1 OW-30

Fuel Feed System

Fuel Tank Capacity

Ignition System Spark Plug Charging Capacity

Starting System Speed Reduction

Governor System

Dry

Weight

Dimensions

Width

Recoil Starter

21

Cam Shaft Drive

14.5kg (31.91b.)

330mm (12.99in.) 366mm (14.41 in.) Height

230 gr/HP-h At Continuous Rated Output Fuel Consumption Rate

Gravity Type

3.6 liters (0.95

Flywheel Magneto (Solid State)

NGK

i

12V- 1.3~

Recoil and Electric

Starter

Centrifugal Flyweight System

17.0kg (37.4Ib.) 303mm (11.93in.) 303mm (11.93in.) Length 345mm (13.58in.) 366mm (14.41

in.)

U.S.

B6HS

1

14.0kg (30.8Ib.) 301 rnm (11.85in.) 330rnm (12.99in.)

gal.)

Recoil

Starter

1

12V- 1.3A

Starter

Recoil and Electric

-

16.5kg (36.3Ib.)

301 mm(11.85in.)

345mm (13.58in.) 366mm (14.41 in.) 366mm (14.41 in.)

-1-

Model

EH17

EH17B EH17BS EH17D EH17DS

TY Pe

X

Bore Piston Displacement Compression Ratio

output

Max. Torque Direction of Rotation Cooling system Valve Arrangement Lubrication Lubricant Capacity of Lubricant Carburetor Fuel

Stroke

Continuous

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

67

X

49

mrn

(2.64 X 1.93 in.)

cc

172

(10.50 cu.in.)

8.5

6.0/2000 HP/rprn

3.5

/

1500 HP/rpm

2.1 8 / 1300 kgm/rpm 1.09 /2600 kg*m/rpm

4.0

/

1800 HP/rpm

Counterclockwise As Viewd From

Forced Air Cooling

Overhead Valve

Automobile Oil

0.65

liters (0.17

Horizontal Draft, Float Type

Automobile Gasoline

I

3.5

Splash Type

SAE

#20, #30 or 1OW-30

U.S.

P.T.O.

13000

P.T.O.

gal.)

Shaft, Gasoline Engine

6.0/4000

HP/rpm 4.0/3600

Shaft Side

HP/rpm

Wrpm

Fuel Consumption Rate Fuel Feed System Fuel Tank Capacity Ignition System Spark Plug Charging Capacity

Starting System Speed Reduction

Governor System Dry Weight

Length

Dimensions

Width Height

-

Recoil Starter

2:l Cam Shaft Drive

16.0 kg

~~~~ ~~

315rnrn (12.40in.) 330mrn (12.99in.) 380mrn (14.96in.)

(35.2

Ib.) 1 18.5 kg (40.7

230 gr/ HP-h At Continuous Rated Output

Gravity Type

3.6

liters

(0.95

U.S.

gal.)

Flywheel Magneto (Solid State)

NGK

B6HS

12V - 1.3A

Recoil and Electric

Starter

I

Centrifugal Flyweight System

Ib.) I 15.5 kg (34.1 Ib.)

315mm (12.4Gin.)

mm

361

380rnm

(14.21 in.) (14.96in.)

I

313mrn (12.32in.) 313mrn(l2.32in.) 330mm (12.99in.) 380mm (14.96in.)

Recoil

-

Starter

12V - 1.3A

1

Starter

Recoil and Electric

I

-

I

18.0 kg (39.6

361 rnm (14.21 in.) 380rnrn (14.9Sin.)

Ib.)

,-

-2-

I

Et125

Model

EH25B EH25BS EH25D EH25DS

TY

Pe

1

Air-Cooled, 4-Cycle, Single-Cylinder, Horizontal P.T.O. Shaft, Gasoline Engine

Bore

X

Stroke

75

X

57 mm (2.95 x 2.24 in.)

Piston Displacement

251

cc (15.31 cu.in.)

Compression Ratio

8.5

Output

Max. Torque

3.38

I1

300

kgWrpm 1.69 / 2600 kg-mlrpm

Continuous 8.5/2000 HP/rpm 8.5/4000 HP/rprn

Max.

5.5/1500 HP/rpm 6.411800 HP/rpm 5.5/3000 HP/rpm 6.4/3600 HP/rpm

Direction

of

Rotation Counterclockwise

As

Viewd From P.T.O. Shaft Side Cooling system Forced Air Cooling Valve Arrangement Overhead Valve

Lubrication Splash Type Lubricant Automobile Oil

SAE

#20,

#30 or 1 OW-30

Capacity

of

Lubricant

1

.O

liters (0.26

U.S.

gal.)

Carburetor Horizontal Draft, Float Type

Fuel

Automobile Gasoline

Fuel Consumption Rate

230

gr/HP-h At Continuous Rated Output

Fuel Feed System

Gravity Type

Fuel Tank Capacity

6.0 liters (1

59

US.

gal.)

Ignition System

Flywheel Magneto (Solid State)

Spark Plug

NGK

B6HS

Charging Capacity

-

12V - 1.3A

-

12V

-

1.3A

Starting System

~~~ ~~

Recoil and Electric

Starter

Recoil

Starter

~~

~~_____

Recoil Starter

Recoil and Electric

Speed Reduction 2:l Cam Shaft Drive

-

Governor System Centrifugal Flyweight System Dry Weight 24.5 kg (53.9

Ib.)

28.5 kg (62.7

Ib.)

24.0 kg (52.8

Ib.)

28.0 kg (61.6

Ib.)

Length 360rnm (14.17in.)

360mrn (14.17in.)

360rnm (14.17in.)

360mm(l4.17in.)

Dimensions

Width

385mm

(15.15in.)

405mm (15.94in.)

385mm (15.15in.)

405mrn (15.94in.)

Height

440mm (17.32in.) 440rnm (17.32in.)

440mm (17.32in.)

-3-

2.

PERFORMANCE

2-1 MAXIMUM OUTPUT

The maximum output

is

the output

of

an engine with its throttle valve fully opened under the

condition

that all the moving parts are properly worn in after the initial break-in period.

A

new engine may not produce full maximum output while

2-2 CONTINUOUS

RATED

OUTPUT

its

moving parts are

still

not broken-in.

The continuous rated output is the output of an engine at optimum governed speed which is favorable

When the engine

required from the engine be kept below

2-3 MAXIMUM TORQUE

The maximum torque

from

the view point of engine’s life and fuel consumption.

is

installed on a certain equipment,

this

continuous rated output.

is

the

torque

at

the output shaft when the engine

it

is

recommended that the continuous output

is

producing maximum output at

certain revolution.

A.

most

-4-

2-4

PERFORMANCE

CURVES

0

EH12D,

B

4.0

(2.98 KW)

3.5

(2.61 KW)

3.0

(2.24 KW)

2.5

(1.87 KW)

2.0

(1.49

KW)

1.5

(1.21 KW)

1

.o

(0.75

KW)

0.5

(0.37

KW)

(

)

for

B

type

-

MAXIMUM TORQUE

1

2000

(1

000)

3000

(1

500)

REVOLUTION

--s)

r.p.m.

0.8

(1.6)

kg-m

0.7

(1.4)

I

W

t

I

0.6

(1.2)

0

I-

CONTINUOUS RETED

HP

RECOMMENDED HORSEPOWER

\

RANGE

4000

(2000)

i

-5-

0

EHf7D,

B

n

( )

for

B

type

..

"

REVOLUTION

"-+

r.p.m.

kg-m

1

.I

0

,(2.2)

t

I

1-00

(2.0)

I

W

Y

0.9

(1.8)

6

CT

0

I-

CoNTiNuous

RETE0

HP

1

RECOMMENDED

\

RANGE

HORSEPOWER

-

6-

0

EH25D,

6

-7-

FEATURES

3.

1.

The overhead valve design offers a compactness, light weight and ideal combustion characteristics

2.

3.

resulting

An

A

crossflow arrangement

in

more power from less fuel and prolonged engine life.

optimum lubrication and better tilted operation thanks to upright cylinder design.

of

intake and exhaust

ports

ensures stable performance under

high

temperature.

4.

The automatic decompressiom system lightens the recoil pull force by conventional

5.

An

easy operation

6.

Combustion and mechanical noises have been carefully reviewed for better tonal quality

SV

engines.

thanks

to

integrated engine control system.

40%

comparing to the

cnginc noise.

7.

Optimally designed reciprocating parts reduce the vibration level

of

the engine.

EH25

engine equips

sjnglc through-balancer shaft.

4.

GENERAL DESCRIPTION OF ENGINE COMPONENTS

4-1

CYLINDER

The

cylinder and crankcase is single piece alu-

minum

diecasting. The cylinder liner, made

special cast iron, is molded

AND

CRANKCASE

into

of

the aluminum casting. The crankcase has output

shaft

side, where the main bearing cover

attached. (See Fig.

21

mounting surface

4-1

.)

on

the

is

ambient

and

lower

F.

I-GKR

i

OILGAUGE

-8-

""

CENTERING

Fig.

4-1

4-2

""

OIL

~

GAUGE

/,"

4-3

CRANKSHAFT

The crankshaft

is

forged carbon steel, and the

crank

pin is induction-hardened.

The output end

of

the shaft has a crankshaft gear,

and balancer gear for

EH25

which are pressed

into

position.

(See

Fig.

4-3.)

4-4

CONNECTtNG

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. 4-4.)

4-5

PISTON RINGS

The Piston rings are made

of

special cast

iron.

The profile

of

the

top ring is barrel face and the

second ring has

a

tapered face with

an

under-cut.

The oil ring consists

of

a cutter ring and a coil

expander

for

better sealing and

less

oil

consump-

tion.

I

B

TYPE

1

D

TYPE

Fig.

4-3

Fig.

4-4

--

TOP RING

SECOND

RIN(

OIL

RING

-9-

4-6

CAMSHAFT

‘I’he camshaft for the D-type engine

is

made

special cast iron and camshaft gears are casted

togcther

Both

on

‘I’hc

in

one

piece.

sides

of

the shaft

the

crankcase and main bearing cover.

camshaft

for

fit

into the plane bearings

the

B-type engine

is

made forged carbon stcel and also functions as shaft.

The cam gear

ball

bearings arc employed

porting the shaft. (See

4-7

VALVE ARRANGEMENT

‘I’he intake v;llve

is

press fitted

is

located

Fig.

on

the

on

both sides

4-6.)

on

flywheel side

shaft

and the

for

cylinder hcad. ‘I’hc

hard

alloy

cylinder head and stcllite

valvc

‘I’hc

valvc

f;KC.

cylindcr

arca

for

valvc

bafflc

seats are molded

is

fused

lo

the exhaust

leads cooling air to the exhaust

the optimum cooling. (See Fig.

PTO

of

in

4-7.)

of

sup-

the

I

B

Fig.

TYPE

I

4-6

D

li’PE

h.

4-8

CYLINDER HEAD

‘I’hc cylindcr hcad is

which utilizcs thc highcst

wcdgc

combusl.ion

a11

aluminurn die casting

type combustion chamber

cli‘icicncy. (See Fig.

4-13,)

for

Fig.

4-7

Fig.

4-8

-

10

-

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 is

in-

stalled

on

the main bearing cover. (See Fig.

4-9.)

/

GOVERNOR GEAR

Fig.

4-9

4-10

COOLING

SYSTEM

The large fins on the flywheel provide sufficient cooling air capacity for the inlet

and

exhaust area and cylinder. The cylinder baffle helps the cooling air

flow

efficiently.

4-1

1

LUBRICATION

All the rotating and sliding parts are splashlubricated

by

the

oil

scraper

on

the connecting rod.

(See Fig.

4-10.)

I

OIL

SCRAPER

Fig.

4-10

-

11

-

4-12

IGNITION

SYSTEM

The ignition system

magneto ignition system which cosists

wheel

and

an

ignition coil with a built

is

a

transistor controlled

of

sistor. This system has an ignition timing advance easy starting. (See Fig.

4-13

The

carburetor that

and The carburetors starting,

and sufficient

For

CARBURETOR

engines are equipped with

has

a

fixed main

jcl.

are

good

acceleration,

output.

datails,

see

page

“CAKBUKE‘I’OR”.

4-1

1.)

a

horizontal draft

a float controlled fuel system

calibrated carefully

low

fuel consumption

47,

(SCC

section

Fig.

8.

4-12.)

in

for

a

tran-

easy

fly-

for

Fig.

4-

1

I

4-14

‘I’hc

AIR

CLEANER

air

clcancr is a single urcthine foam element system.

elemcnI type is available. (See Fig.

__

..

Single element type

Fig.

4-

”

13-1

~.~

~

4-13-1

and

4-13-2.)

-

12

As

-

an

option,

heavy duty type with a double

Double element type

Fig.

4-

COVER

/”

13-2

4-15

SECTIONAL

VIEW

OF

ENGINE

/

FLYWHEEL

FUEL

TANK

/

I

II

+

.

PISTON

I

MAIN BEARING COVER

-

13

-

ROCKER

I

ARM

L

-

14

-

5.

5-1

CAUTIONS

1)

Because some mating parts with wear surfaces were machined together when the engine was manifactured, critical to the performance and life expectancy

THAT THEY WILL

2)

Crankshaft and camshaft bearings should be cleaned to be damaged that rotate roughly

3)

Keep clean and handle carefully the disassembled parts, Clean them thoroughly with washing oil

before the reassembly.

4)

Use correct tools

The use

5-2

SPECIAL TOOLS

of

or

have established wear patterns during operation, the reassembly

of

the engine.

BE

DISASSEMBLED AND INSTALLED IN THEIR ORIGINAL

and

or

excessively worn. Remove bearings that are pitted, nicked, burred, discolored,

or

noisily.

in

the proper way

MARK AND SORT ALL PARTS

inspected, and removed only

non-specified tools could cause permanent damage to the engine

of

or

components.

engine parts,

POSITIONS.

if

is

SO

they appear

or

Tool

No.

209 - 95004

Market parts

FLYWHEEL

-

07

PULLER

Flywheel puller Flywheel puller

Tool

with

bolt

For

pulling

For pulling

FLYWHEEL PULLER

Use

off

the flywheel Eli1

off

the flywheel EH12

7,

EH25

-

15

-

5-3

DISASSEMBLY

PROCEDURES

Step

I

Oil

to

remove

drain

(I)

Remove

(2)

‘To

gauge.

Procedures Part

oil

drain

discharge

plug

and

oil

quickly, remove

drain

oil.

oil

Be

careful

gasket.

Remarks

not

to

lose

the

14mm

Tool

box

wrench

Fig.

5-2

-

16

GASKET

I

DRAIN

PLUG

-

step

Part

to

remove

Procedures

Remarks

Tool

2

Fuel tank

(1)

Close fuel valve.

(2)

Disconnect fuel hose between fuel strainer and carburetor.

(3)

Remove fuel tank

M6X14rnm

M8X20mm

bolt bolt

from

cylinder head.

....

4pcs.

.-..

4pcs.

(EH12,17)

(EH25)

Wipe off

spilt

thoroughly.

fuel

M6

ME

BOLT BOLT

lOrnrn

socket wrench

:

4

pcs.(EH12,17)

:

4

pcs.(EH25)

(1

2mm)

FUEL

HOSE

-

17-

I

Step

3

4

I

Part

Blower

housing

to

remove

1

(I)

(I

Remove recoil from blower housing. Recoil starter

M6

X8mm

)

Remove

M6X

flange

blower

I2mm

Procedures

bolt

-.a-

4pcs.

housing from crankcase.

flange

bolt

-e

-.

4pcs.

~~

I

Remarks

lOmm

Tool

box

wrench

5

Oil

scnsor

(Option)

(1)

Remove

to

sensitive

result.

oil

sensor probe. Be careful not

damage stick and sensor since these are

and

an

erratic operation may

Fig.

5-4

-

18-

Step

6

-

7

'art

to removc

Muffler cover Muffler and

Muffler

bracket

Exhaust

manifold and Manifold cover

Procedures

(1)

Remove muffler cover. M5x lOmm flange

bolt

....

3pcs.

(EH12,17)

M5 X lOmm flange

bolt

-

4pcs. (EH25)

(2)

Remove muffler from exhaust manifold. M8 flange nut

-.

-

2pcs.

(3)

Remove muffler bracket from crankcase. M6X 12mmflangebolt

e...

lpc. (EH12,17)

M8X16mmflangebolt

....

lpc. (EH25)

(1) Remove manifold cover from manifold.

M6X8mm flange

bolt

. . .

.

Ipc.

M8 flange

nut

....

2pcs.

(2)

Remove manifold

from

cylinder head.

Remarks

Be careful not

to

lose

muffler gasket.

Be careful not to lose muffler gasket.

Tool

8mm,

lOmm

and

12mm

socket wrench

IOmm, 12mm socket

wrench

-

19

-

Step

a

Part

to

remove

Control box and Electric starter (Option)

Procedures

(I

)

Disconnect wires.

1

blue

light

black

blue

(diode rectifier

I

(diode rectifier

I

(magnetic

(2) Remove black wires

(3)

Remove control box.

(4)

Loosen

two

flange bolts

electric starter.

M8

flange

bolt

)

switch)

from

electric starter.

and

2pcs.

)

remove

Remarks

Fastened together with

fuel tank.

12mm

socket wrench

Tool

M8

FLANGE

BOLT

:

2

\

pcs.

ELECTRIC

,/

STARTER

/’

Fig.

5-6

-

20

-

Step I Part to remove

9

10

Air

cleaner

I

(1)

Remove head cover from crankcase. Head cover

M6x

12mrn flange

(1)

Remove cleaner cover, cleaner element

Procedures

bolt

-.--

Ipc.

and element retainer.

(2)

Remove cleaner case.

M6

flange

nut

-..-

2pcs.

~~~~

Fastened together

carburetor.

Remarks

with

Tool

I

Ornm

socket wrench

1

Omm

socket wrench

GASKET

CLEANER CASE

Fig. 5-7

-

21

-