Checking The Oil Pump - Yamaha YP250R 2005 Service Manual

OIL PUMP
EAS00364

CHECKING THE OIL PUMP

1. Check:
• oil pump drive gear
• oil pump driven gear
• oil pump housing
• oil pump housing cover
Cracks/damage/wear → Replace the defec-
tive part(s).
2. Measure:
• inner-rotor-to-outer-rotor-tip clearance È
• outer-rotor-to-oil-pump-housing clearance
É
• oil-pump-housing-to-inner-rotor-and-outer-
rotor clearance Ê
Out of specification → Replace the oil pump
assembly.
1 Inner rotor
2 Outer rotor
3 Oil pump housing
Inner-rotor-to-outer-rotor-tip
clearance
Less than 0.15 mm (0.0059 in)
<Limit>: 0.23 mm (0.0091 in)
Outer-rotor-to-oil-pump-housing
clearance
0.013 ~ 0.036 mm
(0.0005 ~ 0.0014 in)
<Limit>: 0.106 mm (0.0042 in)
Oil-pump-housing-to-inner-rotor-
and-outer-rotor clearance
0.04 ~ 0.09 mm
(0.0016 ~ 0.0035 in)
<Limit>: 0.16 mm (0.0063 in)
3. Check:
• oil pump operation
Rough movement → Repeat steps (1) and
(2) or replace the defective part(s).
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