Yamaha YZF-R15, Service Manual

Page: 219 / 338

Removing the oil seal and bearings
Order Job/Parts to remove Qty Remarks
Crankshaft/Balancer Refer to “CRANKSHAFT” on page 5-60.
Transmission Refer to “TRANSMISSION” on page 5-64.
1 Oil seal 1
2 Bearing retainer 1
3 Bearing 7
For installation, reverse the removal proce-
dure.
LT
E
E
E
2
1
3
3
3
3
3
3
3
T
R .
.
7 Nm (0.7 m
•
kg, 5.1 ft Ib)
•
LS
5-57
CRANKCASE
5-58
CRANKCASE
SEPARATING THE CRANKCASE
1. Remove:
• Crankcase bolts
Loosen each bolt 1/4 of a turn at a time, in stag-
es and in the proper sequence as shown.
2. Turn:
• Shift drum segment
Turn the shift drum segment “1” to the position
shown in the illustration. In this position, the shift
drum segment teeth will not contact the crank-
case during crankcase separation.
3. Remove:
• Right crankcase
CAUTION:
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.
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.
CHECKING THE TIMING CHAIN AND TIMING
CHAIN GUIDE
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.
CHECKING THE OIL STRAINER
1. Check:
• Oil strainer
Damage → Replace.
Contaminants → Clean with solvent.
CHECKING THE BEARINGS AND OIL SEAL
1. Check:
• Bearings
Clean and lubricate the bearings, then rotate
the inner race with your finger.
A. Right crankcase
B. Left crankcase
A
B