2-35
2.5.2 Troubleshooting to Crankcase
Description
Damage Form
Trouble Symptom of Component
Trouble Symptom of Motorcycle
Remedy
Crankcase
Cracks on the crankcase
Oil leakage through crankcase
Repair or replace
Threads on the crankcase are
damaged
Oil
leakage
between
RH/LH
crankcases
Repair or replace
Threads of cylinder are damaged
Gas leakage between cylinder head
and cylinder due to loose of
cylinder nuts
Engine fails or is hard to start.
Engine lacks power. Unstable idle
speed
Trim the threaded hole or replace the
crankcase
Bolt of cylinder is broken
Do.
Do.
Replace the broken bolt with a new
one
Oil seal is damaged
Oil leakage through oil seal
Replace the oil seal
Right Crankcase
Cover
Damaged or cracks on the right
crankcase cover
Oil leakage through right crankcase
cover
Repair or replace right crankcase
cover
Gasket is damaged
Oil leakage between right crankcase
and cover
Replace the gasket with a new one
Left Crankcase
Cover
Damaged or cracks on the left
crankcase cover
Oil leakage through left crankcase
cover
Repair or replace left crankcase
cover
Gasket is damaged
Oil leakage between left crankcase
and cover
Replace the gasket with a new one
Water
Pump
Gear
Water pump gear is damaged
Coolant liquid fails to cycle
Engine overheats
Replace water pump gear
Water
Inlet
Cover & Gasket
Gasket is damaged
Water leakage
Replace the gasket with a new one
O-Ring of Water
Pump Gear
O-ring is damaged
Water leakage
Replace the O-ring