11. Crankshaft / Crankcase
11-2
Precautions in Operation
General Information
y This Section concerns disassembly of the crankcase for repair purpose.
y Remove following components before disassembling crankcase.
－Engine remove Chapter 5
－Cylinder head Chapter 6
－Cylinder and piston Chapter 7
－Drive face and driven pulley Chapter 8
－AC generator/Start one way clutch Chapter 10
z In case it requires replacing the crankshaft bearing, the driving chain of engine oil pump or the timing
chain, it is preferably to replace crankshaft as a unit.
Specification Unit: mm
Item
Standard Limit
Connecting rod side clearance of the big end 0.100~0.400 0.600
Vertical clearance of the big end of the connecting rod 0~0.008 0.050
Run-out - 0.100
Torque value
Bolts for crankcase 0.8~1.2kgf-m
Cylinder stud bolts 1.0~1.4kgf-m
Bolt for cam chain adjuster 1.2~1.6kgf-m
Special tools
R/L. crank disassemble tool SYM-1120000-HMA H9A
L. crank shaft bearing puller
SYM-9100100
Crank shaft install socket & oil seal driver
SYM-2341110- HMA RB1
Crank shaft puller
SYM-1130000-HMA H9A
Outer bearing puller
SYM-6204001
Inner bearing puller
SYM-6204022
Clutch nut wrench SYM-9020200
Troubleshooting
Engine noise
y Loose crankshaft bearing
y Loose crankshaft pin bearing
y Worn out piston pin and pin hole
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