5-64
CRANKCASE
ENG
EAS00399
CHECKING THE CRANKCASE
1. Thoroughly wash the crankcase halves in a
mild solvent.
2. Thoroughly clean all the gasket surfaces and
crankcase mating surfaces.
3. Check:
S crankcase
Cracks/damage ! Replace.
S oil delivery passages
Obstruction ! Blow out with compressed air.
EAS00401
CHECKING THE BEARINGS AND OIL
SEALS
1. Check:
S bearings
Clean and lubricate the bearings, then rotate
the inner race with your finger.
Rough movement ! Replace.
2. Check:
S oil seals
Damage/wear ! Replace.
CHECKING THE TIMING CHAIN
1 Check:
S timing chain
2
Damage/stiffness ! Replace the timing
chain and crankshaft sprocket as a set.
S oil/water pump assembly drive chain
1
Damage/stiffness ! Replace the oil/water
pump assembly drive chain and oil/water
pump assembly drive sprocket as a set.
ASSEMBLING THE CRANKCASE
1. Lubricate:
S crankshaft journal bearings
(with the recommended lubricant)
Recommended lubricant
Engine oil
2. Apply:
S sealant
Yamaha bond No. 1215
90890-85505, ACC-1109-05-01
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