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e-mail: [email protected] • www.robinamerica.com
RS 307 - REVISED
May, 2001
• PURPOSE:
• To improve engine reliability, better sealing of governor shaft
• To renew engine design and color
• Reduction of oil consumption, and asbestos-free gasket to comply with emission regulations.
• To reduce engine noise.
• DETAIL OF THE CHANGE:
Refer to pages 5 - 23
• CHANGE OF PART NUMBERS AND INTERCHANGEABILITY:
Refer to pages 20-23
• EXECUTION:
This change has been applied from June 2001 production.
The starting serial numbers are: EY15-3 ; #6000001
EY20-3 ; #6000001
MODEL SUBJECT
EY15-3, EY20-3
SERVICE BULLETIN
Model change of EY15 and EY20
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• DETAIL OF THE CHANGE:
1.) ENGINE DIMENSION
1) EY15-3 STD specification
After the Change
Before the Change
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2) EY15-3 Generator and Pump specification
• DETAIL OF THE CHANGE:
After the Change
Before the Change
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• DETAIL OF THE CHANGE:
Before the Change
After the Change
3) EY20-3 STD specification
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• DETAIL OF THE CHANGE:
2.) CRANKCASE
1) The oil seal will be added in the hole for governor shaft.
After the Change
Before the Change
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• DETAIL OF THE CHANGE:
2) The material of intake valve seat will be changed (EY20-3)
3) The material of exhaust valve seat will be changed (EY15-3, EY20-3)
4) The ball bearing will be changed
5) The Valve guide will be changed
6) The boss to install the exciter coil will be eliminated.
After the Change
Before the Change
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• DETAIL OF THE CHANGE:
3.) MAIN BEARING COVER
The ball bearing will be changed.
4.) GASKET CP (HEAD)
The material will be changed to asbestos-free material (graphite).
NOTE:
When repairing the engine, wipe off oil and clean the contact surface of
crankcase and cylinder head.
5.) GASKET (TAPPET COVER)
6.) GASKET (BREATHER PLATE)
The materials will be changed to asbestos-free materials.
7.) CRANKSHAFT
Material will be changed
8.) PISTON
The piston shape will be changed.
After the Change Before the Change
After the Change Before the Change
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• DETAIL OF THE CHANGE:
9.) TOP RING
The shape of the top ring will be changed.
10.) OIL RING
The specification of the oil ring will be changed.
11.) CAMSHAFT
The material will be changed.
12.) INTAKE VALVE
The distinction mark on vlalve surfaces will be elinimated.
13.) EXHAUST VALVE
The distinction mark on valve surface will be eliminated.
After the Change Before the Change
After the Change Before the Change
After the Change Before the Change
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• DETAIL OF THE CHANGE:
14.) MUFFLER
The muffler shape will be changed from cylinder type to the square type. The direc
tion of exhaust outlet will be changed from "45 degree" to "0 degree ( parallel with the
PTO).
After the Change Before the Change
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• DETAIL OF THE CHANGE:
15.) MUFFLER COVER
The change of muffler cover shape will be accompanied with the muffler change.
NOTE:
After the change of the muffler and muffler cover, the optional parts (exhaust deflector and
spark arrestor) can be installed in the field.
After the Change Before the Change
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• DETAIL OF THE CHANGE:
16.) GASKET (EXHAUST)
The material will be changed to asbestos-free material (graphite).
NOTE:
When repairing the engine, wipe off oil and clean the contact surface. Also replace
the gasket with the new one.
17.) AIR CLEANER AY
The air cleaner will be changed.
18.) GASKET (INSULATOR)
The material will be changed to asbestos-free material (graphite).
19.) GOVERNOR LEVER
The bending angle of the governor lever will be changed to secure a clearance between
the fuel pipe and the governor lever.
20.) BLOWER HOUSING
1) The welding point on the guide plate will be changed.
21.) LABEL (Model)
The design and form will be changed.
After the Change Before the Change
After the Change
Before the Change
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• DETAIL OF THE CHANGE:
22.) RECOIL STARTER AY
1) For STD specification the recoil starter shape will be changed.
Note: The pitch of mounting holes will not be changed.
After the Change Before the Change
After the Change
A B C
EY15-3D 35.5 20.8 45°
EY20-3D ááá
After the Change
A B C
EY15D 45 33 30°
EY20D 51 39 á
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After the Change Before the Change
• DETAIL OF THE CHANGE:
2) For pump and generator specifications the material of the recoils starter will be
changed from sheet metal to resin.
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• DETAIL OF THE CHANGE:
3) Pulling direction of starter knob will be unified as follows:
Direction "H" is unified in Direction "A".
Direction "B" is unified in Direction "C".
Direction "D" is unified in Direction "E".
Direction "F" is unified in Direction "G".
After the Change Before the Change
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• DETAIL OF THE CHANGE:
23.) LABEL, Trademark
The new label will be on the recoil starter.
24.) LABEL, Engine Name
The model name will be changed.
25.) LABEL, Caution
The safety caution label will be changed.
After the Change Before the Change
After the Change Before the Change
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• DETAIL OF THE CHANGE:
26.) FUEL TANK CAP
The material of the outside cap will be changed from sheet metal to resin.
27.) FUEL PIPE
The fuel pipe between the fuel strainer and carburetor will be changed from straight
type to molded type.
After the Change Before the Change
After the Change Before the Change
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• DETAIL OF THE CHANGE:
28.) CARBURETOR
The fuel inlet nipple will be changed from "L" shape pipe to straight pipe.
Note:
Distinction mark for STD carburetor
1533010 (EY15-3D) - 156030 (EY15D)
203110 (EY20-3D) - 203011 (EY20D)
29.) OIL GAUGE
Oil gauge will be changed.
After the Change
Before the Change
Note:
This illustration shows the carburetor for
the EY15-3D.
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• DETAIL OF THE CHANGE:
30.) MAGNETO
1) FLYWHEEL
The thread hole for the flywheel puller will be eliminated.
After the Change Before the Change
Note: How to remove the flywheel
from the engine
1) Remove the fixing nut from flywheel.
2) Remove the starter pulley.
3) Temporally assemble the fixing nut to
the crankshaft thread until the end face.
4) Tap the fixing nut with a plastic ham-
mer to remove the flywheel.
a.) Do not tap directly with a
steel hammer.
b) Be careful not to damage the
thread portion when using a steel
hammer.
Tap the fixing nut after inserting
aluminum bar between the fixing
nut and a steel hammer.
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• DETAIL OF THE CHANGE:
2) IGNITION COIL
The shape of the ignition coil will be changed.
1) EY15-3
2) EY20-3
31.) SWITCH AY
The switch will be changed.
After the Change Before the Change
After the Change Before the Change
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• CHANGE OF PART NUMBERS AND INTERCHANGEABILITY:
1.) EY15-3D
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
AFTER CHANGE QTY. BEFORE CHANGE QTY.
Part Name
Part Number Part NumberInterchangeability
Remarks
Crankcase 281-10101-01 1 226-10101-21 1 Incl. # 2,3
Ball Bearing X60-02500-10 1 060-02500-10 1
Oil Seal 044-00800-10 1 - -
Washer 003-11080-00 1 - -
Main Bearing CV 282-11001-01 1 227-11001-31 1 Inc. # 6
Ball Bearing X60-02500-10 1 060-02500-10 1
Gasket, head 281-15001-H1 1 226-15001-11 1
Gasket, tappet 282-16006-06 1 227-16006-03 1
Gasket, breather 282-16007-03 1 227-16007-03 1
Crankshaft 281-20201-01 1 226-20201-51 1
Piston 281-23401-03 1 226-23411-03 1
Camshaft 281-31701-03 1 226-31701-13 1
Intake Valve 281-33401-03 1 226-33401-03 1
Exhaust Valve 281-33501-03 1 226-33501-13 1
Muffler 281-30101-H1 1 226-30101-01 1
Muffler Cover 281-34201-H1 1 226-34201-11 1
Gasket, exhaust 281-35201-H1 1 226-35201-01 1
Air Cleaner AY 282-32601-H0 1 227-32603-00 1
Gasket 282-35901-03 1 227-35901-03 1
Governor Lever 281-42301-01 1 226-42301-11 1
Blower Housing 281-51260-01 1 226-51201-03 1
Label, model 281-95101-03 1 - -
Label, trademark - - 227-91701-13 1
Recoil Starter 281-50211-00 1 226-50811-00 1
Label, trademark 073-20051-40 1 - -
Label, engine 281-91802-H3 1 226-91802-13 1
Fuel Tank 281-60101-01 1 226-60101-21 1
Label, caution X73-20047-20 1 073-20047-20 1
Fuel Tank Cap 043-04301-00 1 043-04300-15 1
Fuel Pipe 281-62601-H1 1 226-62631-01 1 Incl. # 31,32
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