OIL PUMP
5-53
EAS24930
REMOVING THE OIL PAN
1. Remove:
• Oil level switch lead holder
• Bottom cowling brackets
• Oil pan
• Oil pan gasket
NOTE:
Loosen each bolt 1/4 of a turn at a time, in stag-
es and in a crisscross pattern. After all of the
bolts are fully loosened, remove them.
EAS24960
CHECKING THE OIL PUMP
1. Check:
• Oil pump driven sprocket
• 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 “a”
• Outer-rotor-to-oil-pump-housing clearance
“b”
• Oil-pump-housing-to-inner-rotor-and-outer-
rotor clearance “c”
Out of specification → Replace the oil pump.
3. Check:
• Oil pump operation
Rough movement → Repeat steps (1) and
(2) or replace the defective part(s).
EAS24970
CHECKING THE RELIEF VALVE
1. Check:
• Relief valve body “1”
• Relief valve “2”
• Spring “3”
• O-ring “4”
Damage/wear → Replace the defective
part(s).
1. Inner rotor
2. Outer rotor
3. Oil pump housing
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-housing
clearance
0.090–0.150 mm (0.0035–0.0059
in)
Limit
0.220 mm (0.0087 in)
Oil-pump-housing-to-inner-and-
outer-rotor clearance
0.06–0.11 mm (0.0024–0.0043 in)
Limit
0.18 mm (0.0071 in)
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