Crankcase(Right) Removal; Checking The Crankcase; Checking The Bearings And Oil Seals - Yamaha YW50AP Service Manual

CRANKCASE AND REED VALVE

CRANKCASE(RIGHT) REMOVAL

NOTE:
Loosen each screw 1/4 turn, and remove them
after all are loosened.
NOTE:
Fully tighten the tool holding bolts, but make
sure the tool body is parallel with the case. If
necessary, one screw may be backed out
slightly to level tool body.

CHECKING THE CRANKCASE

CHECKING THE BEARINGS AND OIL SEALS

4-35
1. Remove:
8 Oil seal stopper 1
8 Screws (crankcase)
2. Attach:
8 Crankcase separating tool 1
Crankcase separating tool:
YU-01135
3. Remove
8 Crankcase (right)
As pressure is applied, alternately tap
on the engine mounting bosses.
1. Thoroughly wash the crankcase halves in
a mild solvent.
2. Thoroughly clean all the gasket surfaces
and crankcase mating surfaces.
3. Check:
8 crankcase
Cracks/damage → Replace.
8 oil delivery passages
Obstruction → Blow out with com-
pressed air.
1. Check:
8 bearings
Clean and lubricate the bearings, then
rotate the inner race with your finger.
Rough movement → Replace.
2. Check:
8 oil seals
Damage/wear → Replace.
ENG
9Nm(0.9 m.kg,6.5ft.lb)