KYMCO ZX/SCOUT 50, Service Manual

Page: 103 / 191

10
. CRANKCASE/CRANKSHAFT
10-2
ZX / SCOUT
SERVICE INFORMATION
GENERAL INSTRUCTIONS
•
This section covers crankcase separation to service the crankshaft.
•
The following parts must be removed before separating the crankcase.
Engine (
Ö
Section 5) Driven pulley (
Ö
Section 8)
Carburetor (
Ö
Section 11) A.C. generator (
Ö
Section 7)
Oil pump (
Ö
Section 4) Cylinder head/cylinder (
Ö
Section 6)
Reed valve (
Ö
Section 11)
•
When the left crankcase must be replaced, remove the following part in addition to the above.
Final reduction removal
•
Special tools must be used for crankshaft and crankcase assembly. When separating the
crankcase, the bearing will remain in the crankcase and it should be removed. When,
assembling, drive a new bearing into the crankcase and install a new oil seal.
SPECIFICATIONS
SC10AS
Item Standard (mm) Service Limit (mm)
Connecting rod big end side
clearance
⎯
0.60
Connecting rod big end radial
clearance
⎯
0.04
Crankshaft runout A/B
⎯
0.15/0.10
SPECIAL TOOLS
Crankcase puller Bearing outer driver handle A
Universal bearing puller Bearing outer driver, 42x47mm
Crankcase assembly collar Bearing driver pilot, 20mm
Crankcase assembly tool Bearing outer driver, 37x40mm
Bearing driver pilot, 17mm
TROUBLESHOOTING
Abnormal engine noise
•
Excessive crank journal bearing play
•
Excessive crankpin bearing play
•
Excessive transmission bearing play