Page is loading ...
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
6
7
7
8
8
8
9
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
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
such as a large capacity muffler, dual element air cleaner, helical type balancer gear
with extra long teeth and a blower housing and muffler cover made of resin laminated
"DAMPING
SHEET"
reduce noise to
a
minimum level.
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
of
power equipment.
4.
GENERAL DESCRIPTION
OF
ENGINE COMPONENTS
4-1
CYLINDER AND CRANKCASE
The cylinder and crankcase
is
single piece
aluminum diecasting. The cylinder liner, made
of
special cast iron, is molded into the aluminum
casting.
The crankcase has a mounting surface onthe
output shaft side, where the main bearing cover
is
attached. (See Fig.
1.)
Fig.
I
4-2
MAIN
BEARING
COVER
The main bearing cover
is
an aluminum
diecasting, which
is
mounted on the outprt shaft
side of the crankcase. Remove the main bearing
cover
to
inspect inside
of
the engine.
The main bearing cover also functions as an oil
pan, with
a
trochoid oil pump,
oil
filler and
oil
drain plug. (See Fig.
2.)
Fig.
2
-4-
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.
The cylinder baffle leads cooling air
to
the
exhaust valve area for the optimum cooling.
(See Fig.
6.)
EXHAUST 'VALVE
INTAKE
VALVE
Fig.
6
4-7
CYLINDER HEAD
The cylinder head
is
an aluminum die casting,
which utilizes wedge type combustion chamber
for the highest combustion efficiency.
(See Fig.
7.)
4-
8
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
installed on the bearing cover and driven by
the camshaft gear. (See Fig.
8.)
Fig.
7
Fig.
8
-6-
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
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
AND
REASSEMBLY
5-
1
PREPARATIONS AND SUGGESTIONS
1)
When disassembling the engine, memorize well the locations of individual parts
so
that they
can be reassembed correctly.
If
yor are uncertain
of
identifying
some
parts,
it
is suggested
that tags
be
attached to them.
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
if
necessary.
5)
Use the correct tools in the correct way.
5-2
SPECIAL TOOLS
Tool
No.
Use
Tool
209
-
95004
-
07
For
pulling off the flywheel
Flywheel puller with
bolt
228
-
95003
-
07
For placing piston ring
Piston ring compressor
PISTON
RING
COMPRESSOR
/
FLYWHEEL
PULLER
Fig.
15
-
12
-
5-
3
DISASSEMBLY PROCEDURES
Part
to remove
Oil
drain
Procedures
Tool
Remarks
Remove
oil
drain plug and drain oil. 17mm
Box
wrench
Be
careful not to
lose
the gasket.
Fuel tank
(1)
Turn
off fuel shut
-
off valve
and
(2)
Fuel shut-off valve and fuel line.
lOmm
Box
wrench
remove fuel
tank.
6
d
X
~OITUII
Bolt
*.**--**
2pcs.
6
4
X
35m
Bolt
*-.-..*.
1
pce.
I
6
+
BOLT
AND
WASHER
Fig.
I6
-
13
-
Step
Air cleaner
3
Part
to
remova Procedures
(1)
Remove air cleaner cover and element.
6
d
Plastic nut
6
d
Wing
nut
6
d
X
2Omm
Bolt
.--.
lpce.
6
d
x
lOmm
Bolt
*.-e
lpce.
base
and
crankcase.
cleaner) from stud
bolts.
6
Nut
--**
2pcs.
(2)
Remove
air
cleaner bracket
(3)
Remove breather hose from cleaner
(4)
Remove cleaner
base
and gasket
(Air
Remarks Tool
lOmm
Box
wrench
lOmm
Box
wrench
CLEANER
COVER
6
Q
FLANGE NUT:
2pcs.
6
Q
FLANGE
BOLT
Fig.
17
-
14
-
tep
4
control
Procedures
(1) Remove speed control assembly from
crank
case.
Then governor spring from
governor lever.
6
q5
X
16mm Bolt
-...
2pcs.
(2) Remove choke rod from speed
control
assembly, then remove choke rod from
choke shaft of the carburetor.
Remarks
Memorize
or
mark the
govenor spring hooking
position.
1
Governor (1) Remove governor lever from governor
lever shaft.
6
q5
x
25mm Bolt
*-a.
lpce.
(2)
Remove rod spring and governor rod
from governor lever, then remove rod
spring and governor rod from throttle
shaft
of
the carburetor.
Tool
10mm
Box
wrench
10mm
Box
wrench
Ppcs.
GOVERNOR
SHAFT
/
ROD
SPRING
Fig.
19
-
15
-
Step
Remarks
Procedures
Part to remove
6
Carburetor
(1)
Remove carburetor from stud bolts.
(2)
Remove gasket
(
Insulator
)
and
insulator from stud bolts.
Muffler
(1) Remove muffler and muffler cover
from stud
bolts.
8
4
x
16mm
Bolt
....
lpce.
bolts.
84
Nut........
.....
2pcs.
(2)
Remove gasket (Muffler) from stud
Be careful not to
lose
the gasket.
Tool
12mm Box wrench
Fig.
20
-
16
-
/