General Information; Trouble Diagnosis - Sym GTS 250 Service Manual

11. Crankcase / Crank

General Information

Operational precautions
This Section concerns disassembly of the crankcase for repair purpose.
Remove following components before disassembling crankcase.
¡ Ð Engine remove
¡ Ð Cylinder head
¡ Ð Cylinder and piston
¡ Ð Drive face and driven pulley
¡ Ð AC generator/Start one way clutch
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
Connecting rod side clearance of the big end
Vertical clearance of the big end of the connecting rod
Run-out
Torque value
Bolts for crankcase
Cylinder stud bolts
Bolt for cam chain adjuster
Special tools
R/L. crank disassemble tool
L. crank shaft bearing puller
Crank shaft install socket & oil seal driver
Crank shaft puller
Outer bearing puller
Inner bearing puller
Clutch nut wrench

Trouble Diagnosis

Engine noise
Loose crankshaft bearing
Loose crankshaft pin bearing
Worn out piston pin and pin hole
11-2
To this chapter contents
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 10
Item
0.8~1.2kgf-m
1.0~1.4kgf-m
1.2~1.6kgf-m
SYM-1120000-HMA H9A
SYM-9100100
SYM-2341110- HMA RB1
SYM-1130000-HMA H9A
SYM-6204001
SYM-6204022
SYM-9020200
Standard
0.100~0.400
0~0.008
-
Unit: mm
Limit
0.600
0.050
0.100