Checking The Oil Pump; Checking The Relief Valve - Yamaha V Star 950 Service Manual

EAS24960

CHECKING THE OIL PUMP

1. Check:
• Oil pump housing
Cracks/damage/wear → Replace the oil
pump assembly.
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance "a"
• Outer-rotor-to-oil-pump-housing clear-
ance "b"
• Oil-pump-housing-to-inner-rotor-and-
outer-rotor clearance "c"
Out of specification → Replace the oil
pump assembly.
Inner-rotor-to-outer-rotor-tip
clearance
Less than 0.12 mm (0.0047 in)
Limit
0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-hous-
ing clearance
0.09–0.19 mm (0.0035–0.0075
in)
Limit
0.26 mm (0.0102 in)
Oil-pump-housing-to-inner-and-
outer-rotor clearance
0.03–0.10 mm (0.0012–0.0039
in)
Limit
0.17 mm (0.0067 in)
1. Inner rotor
2. Outer rotor
3. Oil pump housing
3. Check:
• Oil pump operation
Rough movement → Repeat steps (1)
and (2) or replace the oil pump assembly.
EAS24970

CHECKING THE RELIEF VALVE

1. Check:
• Relief valve body "1"
• Relief valve "2"
• Spring "3"
• Spring retainer "4"
Damage/wear → Replace the relief valve
assembly.
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OIL PUMP