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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 remove Section 5
Cylinder head Section 6
Cylinder and piston Section 7
Drive face and driven pulley Section 8
AC generator/Start one way clutch Section 10
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
Engine oil drain bolt 3.5~4.5kgf-m
Cylinder stud bolt 1.0~1.4kgf-m
Tools
Special tools
L. crank shaft oil seal driver (27*42*7): SYM-1332100-HMA
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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