Yamaha RS90GTZ Service Manual page 277

OIL PAN AND OIL PUMP
3. Measure:
• Inner-rotor-to-outer-rotor-tip clearance
(between inner rotor
• Outer-rotor-to-oil-pump-housing clearance
(between outer rotor
)
Out of specifications → Replace the oil
pump assembly.
Inner-rotor-to-outer-rotor-tip
clearance:
0.090 ~ 0.150 mm
(0.0035 ~ 0.0059 in)
Limit:
0.230 mm (0.0091 in)
Outer-rotor-to-oil-pump-housing
clearance:
0.030 ~ 0.080 mm
(0.0012 ~ 0.0032 in)
Limit:
0.150 mm (0.0059 in)
4. Inspect:
• Oil pump operation
Rough movement → Repeat steps (2) and
(3) or replace the oil pump assembly.
TIP
Install the oil pump driven gear to check the oil
pump operation.
5. Inspect:
• Relief valve body
• Relief valve
• Spring
Damage/wear → Replace the oil pump
assembly.
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ENG
and outer rotor )
and pump housing