KYMCO Downtown 300i ABS, Service Manual

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11. CRANKCASE/CRANKSHAFT
11-2
Downtown 300i ABS
SERVICE INFORMATION
GENERAL INSTRUCTIONS
•
This section covers crankcase separation to service the crankshaft. The engine must be removed
for this operation.
•
When separating the crankcase, never use a driver to knock the crankcase forcedly to prevent
damaging the mating surfaces.
•
When installing the crankcase, do not use an iron hammer to tap it.
•
When installing the crankcase or crankshaft, must be replaced in pair.
•
The following parts must be removed before separating the crankcase.
Cylinder head
Cylinder/piston
Right crankcase cover/drive and driven pulley
A.C. generator/starter clutch
Rear wheel/rear shock absorber
Starter motor
Oil pump
SPECIFICATIONS
Item
Standard (mm) Service Limit (mm)
Connecting rod big end side clearance
0.15
～
0.35 0.6
Crankshaft
Connecting rod big end radial clearance
0
～
0.008 0.05
TORQUE VALUES
Crankcase cover bolt 1.0~1.4 kgf-m (11.8 N-m)
Cam chain tensioner pivot 0.8~1.2 kgf-m (9.8 N-m)
TROUBLESHOOTING
Excessive engine noise
•
Excessive bearing play
•
Excessive crankpin bearing play
•
Worn piston pin and piston pin hole