Checking The Timing Chain And Timing Chain Guides; Checking The Bearings And Oil Seals; Checking The Crankcase - Yamaha XT660R S Service Manual

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CRANKCASE
2. Check:
• oil delivery pipe 3
Cracks/damage → Replace.
• oil delivery pipe holes 1
Clogged → Blow out with compressed air.
EAS00207
CHECKING THE TIMING CHAIN AND
TIMING CHAIN GUIDES
1. Check:
• timing chain
Damage/stiffness → Replace the timing
chain and camshaft sprocket as a set.
2. Check:
• timing chain guide (intake side)
Damage/wear → Replace.
EAS00401
CHECKING THE BEARINGS AND OIL
SEALS
1. Check:
• bearings
Clean and lubricate the bearings, and then
rotate the inner race with your finger.
Rough movement → Replace.
2. Check:
• oil seals
Damage/wear → Replace.
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:
• crankcase
Cracks/damage → Replace.
• oil delivery passages
Obstruction → Blow out with compressed
air.
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