Yamaha RS90K Service Manual page 248

3
4
3
2
1
OIL PAN AND OIL PUMP
NOTE:
Install the oil pump gear to check the oil pump oper-
ation.
1
2
5-46
3. Inspect:
• Oil pump operation
Rough movement → Repeat steps (1) and (2)
or replace the defective part(s).
4. Inspect:
• Relief valve body 1
• Relief valve 2
• Spring 3
Damage/wear → Replace the defective
part(s).
5. Inspect:
• Oil pump driven gear
Cracks/damage/wear → Replace.
6. Inspect:
• Check ball seat 1
• Check ball 2
• Spring 3
• Spacer 4
Damage/wear → Replace the defective
part(-s).
7. Inspect:
• Oil strainer
Damage → Replace.
Obstruction → Wash and blow out with com-
pressed air.
Contaminants → Clean with engine oil.
ENG