Precautions In Operation; Troubleshooting; Service Data - Sym MAXSYM 400i Service Manual

11. Crankshaft / Crankcase

Precautions in Operation

• This Section concerns disassembly of the crankcase for repair purpose.
• Remove following components before disassembling crankcase.
─Engine
－Cylinder head
－Cylinder and piston
－Drive pulley and driven pulley
－AC generator/Start driven gear
－Starting motor
• 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.

Service data

Connecting rod side clearance of the big end
Vertical clearance of the big end of the connecting
Crankshaft
rod
Run-out
Torque value
Bolts for crankcase
Bolts for cam chain adjuster
Tools
Special tools
R/L. crank disassemble/ install tool
L. crank shaft bearing driver
Crank shaft bearing fixing socket
Crank shaft puller
Outer bearing puller
Inner bearing puller

Troubleshooting

Engine noise
• Loose crankshaft bearing
• Loose crankshaft pin bearing
• Worn out piston pin and pin hole
11-2
To this chapter contents
Section 5
Section 6
Section 7
Section 8
Section 10
Section 16
Item
0.8~1.2kgf-m
1.2~1.6kgf-m
Standard Limit
0.100~0.400 0.600
0~0.008 0.050
- 0.100
Unit: mm