Inspection - Yamaha RS90GTZ Service Manual

CRANKCASE

INSPECTION

1. Inspect:
• Crankcase:
Cracks/damage → Replace.
TIP
• Thoroughly wash the crankcase halves in a
mild solvent.
• Thoroughly clean all the gasket surfaces and
crankcase mating surfaces.
• Oil delivery passages
Obstruction → Blow out with compressed
air.
2. Inspect:
• Timing chain
• Oil pump drive chain
Damage/stiffness → Replace the chain
and sprocket as a set.
3. Inspect:
• Timing chain guide (intake side)
• Timing chain guide (exhaust side)
Damage/wear → Replace the timing chain
guide(-s).
5-59
ENG