Subaru Robin Power Products EY44-2, EY33-2 User Manual
ROBIN
AMERICA,
INC.
ROBIN
TO
WISCONSIN ROBIN
ENGINE
MODEL
CROSS
REFERENCE
LIST
ROBIN
EY
08
EY15
EY 15V
EY20
EY20V
EY23
EY28
EY3 5
EY40
EY45V
EY2
1
EY44
EY 18-3
EY25
EY27
EH11
EH12
EH15
EH17
EH2 1
EH25
EH3
0
EH30V
EH34
EH34V
EH43V
EC13V
DY
23
DY27
DY30
DY35
DY4
1
WISCONSIN
ROBIN
SIDE
VALVE
W
1-080
WI-145
W1-145V
W1-185
W1-185V
W 1-230
W 1-280
Wl-340
W1-390
W 1 -450V
EY21W
EY44W
EY
18-3W
EY25W
EY27W
v
WO1-115
wo1-120
WO1-150
WO1-170
wo1-210
WO 1-250
WO
1
-300
WOI-3oov
WO 1-340
WO1-340V
WO 1-43 OV
TWO
CYCLE
WT1-125V
DIESEL
WRD
1-230
WRD
1-270
WRD1-300
WRD1-350
WRD1-410
CONTENTS
Section Title Page
1
.
SPECIFICATIONS
............................................
1
2
.
PERFORMANCE
............................................
2
2.1
.
Maximumoutput
.......................................
2
2.2
.
Continuous Rated Output ................................. 2
2.3
.
Maximum Torque and Fuel Consumption Ratio
at
Max . Output
........
2
3
.
FEATURES
...............................................
3
4
.
GENERAL DESCRIPTION
of
ENGINE CONSTRUCTION
...............
4
4.1
.
4.2
.
4.3
.
4.4
.
4.5
.
4.6
.
4.7
.
4.8
.
4.9
.
4.10
.
4.11
.
4.12
.
4-1
3
.
4- 14
.
4.15
.
4- 1 6
.
Sectional View
of
Engine
..................................
4
Crankcase
...........................................
6
Main Bearing Cover
.....................................
6
Crankshaft
...........................................
6
Connecting Rod and Piston
................................
6
Camshaft
...........................................
6
Cylinder and Cylinder Head
...............................
6
Valve Arrangement
.....................................
6
Balancer
.............................................
6
Governor
.............................................
7
Cooling
.............................................
7
Lubrication
...........................................
7
Ignition
.............................................
7
Carburetor
...........................................
7
Air Cleaner
...........................................
7
Selenium Rectifier
......................................
7
5.lNSTALLATlON
............................................
8
5.1
.
Mounting
............................................
8
5.2
.
Ventilation
...........................................
8
5.3.
Exhaust
Gas
Evacuation
..................................
8
5.4
.
Fuel System
..........................................
8
5.5
.
Power Transmission to Driven Machines
.......................
8
5.6
.
Wiring
..............................................
9
6
.
DISASSEMBLY
and
REASSEMBLY
..............................
10
81
.
Preparations and Suggestions
...............................
10
6-2 . SpecialTools
.........................................
10
6-3
.
Disassembly and Reassembly Procedures
.......................
11
7
.
MAGNETO
...............................................
18
7.1
.
Magneto
.............................................
18
7.2
.
Breaker Point Adjustment
.................................
18
7.3
.
Timing Adjustment
.....................................
18
7.4
.
Magneto Service Instructions
...............................
19
8
.
GOVERNOR
ADJUSTMENT
...................................
21
9.CARBURETOR
.............................................
22
9.1
.
Operation and Construction
................................
22
9.2
.
Disassembly and Reassembly
.................................
23
9.3
.
Adjustment
..........................................
23
10
.
RUN-IN OPERATION
OF
ENGINE
after
REASSEMBLY
...............
25
11
.
TROUBLE SHOOTING
.......................................
26
11.1 . Starting Difficultes
......................................
26
11.2 . Engine Misses
.........................................
27
11.3
.
Engine Stops
..........................................
27
11.4 . Engine Overheats
......................................
27
11.5 . Engine Knocks
........................................
28
11
.6
.
Engine Backfires Through Carburetor
.........................
28
12
.
CHECKS
and
CORRECTIONS
..................................
29
13 . MAINTENANCE
and
STORING
.................................
35
13.1
.
Daily Checks and Maintenance
..............................
35
13.2
.
Every 20 Hours Checks and Maintenance
.......................
35
13.4
.
Every 100-200 Hours (Monthly) Checks and Maintenance
...........
35
13.5
.
Every
500-600
Hours (Semianual) Checks and Maintenance
..........
36
13.6 . Every 1000 Hours (Yearly) Checks and Maintenance
...............
36
13.7 . Preparation for Long Abeyance
.............................
36
13.3 . Every
50
Hours (10 days) Checks and Maintenance
................
35
1.
SPEC1
FICATIONS
-1-
2.
PERFORMANCE
2-1 MAXIMUM OUTPUT
The maximum output
the moving parts properly worn-in, when operating with the fully open throttle valve. Therefore, it follows that
engine may not develop this maximum output in the beginning, because moving parts are not in a properly
condition.
2-2
CONTINUOUS RATED OUTPUT
The continuous rated output of an engine is such power as developed by that engine when running at an optimum speec
most favorable from the point
driving system for any mechanism, with a model
of
requirement
2-3 MAXIMUM TORQUE AND FUEL CONSUMPTION RATIO AT MAX. OUTPUT
The maximum torque
while the engine is developing its max. output. The fuel consumption ratio at max. output
an
engine while that engine is running at the max. output.
that mechanism must be kept below the continuous rated output specified.
a
of
an engine is such standard power as developed by that engine, after its initial run-in period with a1
of
view of engine life and fuel consumption ratio. Therefore, it follows that when designing
of
an engine is that driving torque
PERFORMANCE CURVE
EY33-2
RECOMMENDED OPERATING SPEED RANG
or
EY44-2
of
the driving shaft at which the engine is driving
Model
EY33-2
engine,
as
a
prime mover, the continuous powe
is
that fuel consumption ratio
(
)for B type
an
external load
a
nev
w0rn-h
i
o
I
HP
125112
124)12
I
ft"b
(23J11.5--
7
5
MAX.
5
-I
TORQUE
1.7(3.4)
--
~
1.6(3.2)
I
kg-rn
1.5
(3.0)
320
300
280
g/
P.h
2000
(1OOO)
2500
112501
rpm
-
-2-
3000 3500
115001
11750)
3.
FEATURES
1.
A
compact, lightweight, and highly durable 4cycle aircooled EYseries with high output, embodying ingenious design
and advanced machining techniques.
2.
Simple construction, good appearance, plus easy start-up.
3.
Smooth speed control functions
range
of
applications.
4.
Economical advantage with minimized fuel consumption.
5.
Since power can be taken in any direction simply by pulling the belt, and the feed and drain oil work can also be done
of
easily in two directions
6.
The use
of
dynamic balancer reduces vibrations to such an extant as in a two-cylinder engine.
engine, the engine is easily coupled with operating machines.
of
governor guarantees stable operation under various load conditions over a wide
HP
(33)
(32)
(31)
tt-lb
11
10
9
0
7
6
16.5
16
15.5
PERFORMANCE
Model
RECOMMENDED OPERATING SPE
CURVE
EY44-2
(
)for
B
type
2.3(4.6)
2.2(4.4)
kg-m
2.1(4.2)
2000
(1000)
2500
(1250)
3000
(1500)
rpm-
-J-
3500
(1750)
/-
FLYWHEEL(COOLI~G
FAN)
LIGHTING
I
COIL
-4
\
CRANKCASE
-
SEl
-5-
4-2
CRANKCASE
The crankcase is made
of
aluminum die-cast and separable on driving shaft side with main bearing cover assembled.
Provided on blower side are two ball bearings, each supporting the crankshaft and camshaft.
4-3
MAIN BEARING COVER
The aluminum die-cast main bearing cover on the driving shaft side allows easy access
to
the engine interior
for
inspection
simply by removing it. The’fange and boss permit direct coupling of operating machines such as generators, pumps, etc.
The oil inlets which
also serve as oil gauges can be mounted on driving shaft side of Models
EY33-2B
and
EY44-2B.
The force-fit balancer shaft and balancer holder mounting boss assure easy mounting of the balancer mechanism.
44
CRANKSHAFT
The crankshaft is machined from carbon steel forging with an induction hardened crank pin. The breaker cam
is
provided on
blower side, while crankshaft gear and balancer gear are force-fit on driving side.
4-5
CONNECTING
The connecting rod
(Model
An
EY44-2 employs aluminum metal on the large end.)
oil
scraper is provided on the large end for the purpose of splashing lubricating oil. The piston is machined fron
ROD
and PISTON
is
machined from aluminum alloy forging, and forged alloy itself serves as bearing metal at both ends.
aluminum alloy casting and provided with grooves for two compression rings, one oil rings, and one skirt ring.
The
EY44-2
piston has
an
offset structure at the piston pin center
so
as
to reduce striking sound of piston.
4-6
CAMSHAFT
The carbon steel forging camshaft incorporates integral intake and exhaust cams plus a force-fit cam gear.
also
serves
as
camshaft
4-7
CYLINDER and CYLINDER HEAD
The cylinder is made
head is made
of
driving shaft and it
of
special cast iron and provided with many fins for assuring excellent cooling effects. The cylinda
aluminum alloy casting. The Ricardo type combusion chamber with a sufficient area assures hil
combusion efficiency. The spark plug
4-8
VALVE ARRANGEMENT
The exhaust valve
durability
4-9
of
BALANCER
engine.
is
positioned in the upstream of the colling
is
driven at half the crankshaft speed.
is
tilted
to
facilitate fuel tank mounting.
air
so
that it is intensively cooled down for improv
An unbalanced inertia force produced due to crankshaft and piston connecting rod in the vertical and lateral direction:
balanced by balancer which rotates at
ratio of
1:
1
in the direction opposite to crankshaft,
so
that vibrations due
a
unbalanced inertia force are reduced.
The
B-typ
-6-
4-10 GOVERNOR
The centrifugal flyweight type governor assures constant-speed operation at selected speed, irrespective
4-11
COOLING
The cooling fan which also serves as a flywheel forcily feeds cooling air to the cylinder head with the aid
and head cover.
4-12
LUBRICATION
The rotating and sliding parts are lubricated by scooping and splashing oil in crankcase with oil scraper attached to
connecting rod.
4-13
IGNITION
The ignition system is
flywheel, an ignition coil, a breaker, and lighting (charging) coil. The flywheel (serving also as a fan)
crankcase, while the other elements are directly assembled in crankcase (For details, refer to the MAGNETO section).
4-14 CARBURETOR
A
horizontal draft carburetor is employed. Its setting has been carefully after thorough tests to achieve best start-up,
acceleration, fuel consumption, output, and other performance. For other details, see the CARBURETOR section.
of
flywheel magneto type with ignition timing set at
23'
before TDC. The magneto
of
load fluctuations.
of
cylinder baffles
is
composed
is
mounted on
of
a
4-15 AIR CLEANER
An impinge type semi-wet air cleaner catches dust particles in the air by means of felt in dust case. The air
by passing through a filter element.
4-16 SELENIUM RECTIFIER
The selenium rectifier serves
battery when a starting motor is combined.
to
rectify the
AC
current generated by AC charging coil
of
magneto into DC current to charge
is
then cleaned
-7-
5.
INSTALLATION
Since the installation method affects the service life, ease of maintenance, frequency of check and reapir, and operating
of
costs
For details, refer to the separate “SALES MANUAL”-Engineering Information-.
5-1
engine, the following contents should be carefully examined before installing your engine.
MOUNTING
When installing the engine, its mounting position, coupling conditions with operating machines, and anchoring
methods must be carefully examined. Particularly when determining its mounting position, due care should be taken to
of
assure the convenience of such routines as replenishment and checking
of
points, maintenance
5-2
VENTILATION
The engine must be supplied with .fresh air for cooling and fuel combustion.
room, the engine room is heated, causing vapor lock, deterioration of oil, increase of oil consumption, power reduction,
loss
seizure,
It is therefore necessary
of heated air after cooling engine and or temperature-rise of operating machines.
The temperature
53
EXHAUST GAS EVACUATION
Since the exhaust gas from engine is toxic, it must be exhausted outside if engine is operated indoors.
As
the output power
proportion to its length.
of engine life, and thus proper engine operation can be expected
air cleaner, and oil drainage.
to
provied a cooling air duct and a baffle plate for the purpose
of
engine compartment should be kept below 4OoC even in mid-summer.
of
an engine is considerably influenced by the length of exhaust duct, its diameter must be increased in
fuel and oil, checking
If
engine is operated with a cover
no
longer.
of
preventing insufficient circulation
of
spark plug and breaker
or
supporting
or
in
a small
5-4
FUEL SYSTEM
When fuel tank is separated from engine, it must be located
the fuel joint
may overflow.
For fuel piping, carefully examine it for heat conductivity, diameter, bending, and leakage through fittings
air lock and vapor lock.
It
is recommended
5-5
POWER
5-5-1
Be
careful with the following items.
*Ilse a V-belt rather than a flat belt.
*Set the driving shaft of engine and the driven shaft
*Align the driving pulley
*Mount the driving pulley
of
TRANSMISSION
BELT
DRIVE
carburetor.
to
If
the fuel tank
minimize piping length. The standard
to
DRIVEN
of
engine and the driven pulley
as nearer to the engine as possible.
is
installed too low, fuel is not fed properly, and if it is too high, the carburetor
MACHINES
of
so
that its bottom surface lies within 5-50cm
ID
of
fuel pipe is 4-5mm
driven machine in paralled with each other.
of
driven machine correctly with each other.
-8-
(5,2”-13/64“).
(2”-20”)
so
as to eliminate
above
5-6
WIRING
a
-e
-@
-
"""
JIS
JIS
JIS
The
CB104
CA104
LA
104
dotted
female terminal
male terminal
or
LA1
08
plate terminal
parts are
not
supplied
with
the
engine.
5-6-1
5-6-2
ROPE STARTING ENGINE
SPARK PLUG
ENGINE with STARTING MOTOR
MAGNETO
MAGNETO
Fig.
5-6-1
_""""
LAMP
(12V.
15W)
'.-N
BUZZER
(6"-
8W)
/
LA
104
-
g
-:
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