11. CRANKCASE / CRANK
11-2
General information
Operational precautions
y This Section concerns disassembly of the crankcase for repair purpose.
y Remove following components before disassembling crankcase.
－Engine Section 5
－Cylinder head Section 6
－Cylinder and piston Section 7
－Drive pulley and driven pulley Section 8
－AC generator/Start driven gear Section 10
－Starting motor Section 16
y 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
Crankshaft
Run-out - 0.100
Torque value
Bolts for crankcase 0.8~1.2kgf-m
Bolts for cam chain adjuster 1.2~1.6kgf-m
Tools
Special tools
R/L. crank disassemble/ install tool: SYM-1300001-H9A
L. crank shaft bearing driver: SYM-9100200-H9A
Crank shaft bearing fixing socket: SYM-9100210-H9A
Crank shaft puller: SYM-1130000-H9A
L. crank shaft oil seal driver (25*40*8): SYM-9121600
Outer bearing puller: SYM-6204010
Inner bearing puller: SYM-6204020
Clutch nut wrench: SYM-9020200
Trouble diagnosis
Engine noise
y Loose crankshaft bearing
y Loose crankshaft pin bearing
y Worn out piston pin and pin hole
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