Separating The Crankcase; Checking The Timing Chain And Timing Chain Guide; Checking The Oil Strainer; Checking The Bearings And Oil Seals - Yamaha YFM70RY Service Manual

EAS1S3L036

SEPARATING THE CRANKCASE

1. Remove:
• Crankcase bolts
TIP
Loosen each bolt 1/4 of a turn at a time, in stag-
es and in a crisscross pattern. After all of the
bolts are fully loosened, remove them.
A
B
A. Right crankcase
B. Left crankcase
2. Remove:
• Right crankcase
• Dowel pins
• O-ring
ECA13900
NOTICE
Tap on one side of the crankcase with a soft-
face hammer. Tap only on reinforced por-
tions of the crankcase, not on the crankcase
mating surfaces. Work slowly and carefully
and make sure the crankcase halves sepa-
rate evenly.
EAS1S3L023
CHECKING THE TIMING CHAIN AND TIMING
CHAIN GUIDE
1. Check:
• Timing chain
Damage/stiffness → Replace the timing
chain and camshaft sprockets as a set.
2. Check:
• Timing chain guide (intake side)
Damage/wear → Replace the defective
part(s).
EAS24990

CHECKING THE OIL STRAINER

1. Check:
• Oil strainer
Damage → Replace.
Contaminants → Clean with solvent.
EAS1S3L037

CHECKING THE BEARINGS AND OIL SEALS

1. Check:
• Bearings
Clean and lubricate, then rotate the inner
race with a finger.
Roughness → Replace.
2. Check:
• Oil seals
Damage/wear → Replace.
5-59
CRANKCASE