Checking The Crankcase; Checking The Sprockets And Chains - Yamaha YZF-R1 1998 Service Manual

CRANKCASE
EB412420

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:
• upper crankcase
• lower crankcase
Cracks/damage → Replace.
• oil delivery passages
Obstruction → Blow out with com-
pressed air.
EB412440
CHECKING THE BEARINGS AND OIL SEALS
1. Check:
• bearings
Clean and lubricate the bearings, then
rotate the inner race with your finger.
Rough movement → Replace.

CHECKING THE SPROCKETS AND CHAINS

1. Check:
• crankshaft sprocket 1
• oil/water pump assembly drive
sprocket 2
Cracks/damage/wear → Replace the
defective part(-s).
2. Check:
• timing chain 1
Damage/stiffness → Replace the tim-
ing chain and crankshaft sprocket as a
set.
• oil/water pump assembly drive chain 2
Damage/stiffness → Replace the oil/
water pump assembly drive chain and
oil/water
sprocket as a set.
4 - 61
ENG
pump assembly drive