Abnormal Engine Noise; Crankcase/Crankshaft; Service Information; Troubleshooting - KYMCO SUPER8 50 2T Service Manual

10

. CRANKCASE/CRANKSHAFT

SERVICE INFORMATION

GENERAL INSTRUCTIONS
• This section covers crankcase separation to service the crankshaft.
• The following parts must be removed before separating the crankcase.
Engine ( Section 5)
Carburetor ( Section 11)
Oil pump ( Section 4)
Reed valve ( 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
Item
Connecting rod big end side
clearance
Connecting rod big end radial
clearance
Crankshaft runout A/B
SPECIAL TOOLS
Crankcase puller
Universal bearing puller
Crankcase assembly collar
Crankcase assembly tool

TROUBLESHOOTING

Abnormal engine noise

• Excessive crank journal bearing play
• Excessive crankpin bearing play
• Excessive transmission bearing play
Driven pulley ( Section 9)
A.C. generator ( Section 7)
Cylinder head/cylinder ( Section 6)
SUPER8 50 2T
Standard (mm)
⎯
⎯
⎯
Bearing outer driver handle A
Bearing outer driver, 42x47mm
Bearing driver pilot, 20mm
Bearing outer driver, 37x40mm
Bearing driver pilot, 17mm
SUPER8 50 2T
Service Limit (mm)
0.60
0.04
0.15/0.10
10-2