Yamaha RS90K Manuel D'atelier page 508

2
2
1
2
OIL PAN AND OIL PUMP
1
1
5-45
REMOVAL
1. Remove:
• Oil pan 1
NOTE:
Loosen each bolt 1/4 of a turn at a time, in stages
and in a crisscross pattern. After all of the bolts are
fully loosened, remove them.
2. Remove:
• Oil pump driven gear 1
NOTE:
• While holding the oil pump driven gear with the
rotor holding tool 2, loosen the oil pump driven
gear bolt.
• To prevent the oil pump chain falling into the
crankcase, fasten it with a wire.
INSPECTION
1. Inspect:
• Oil pump housing 1
• Oil pump cover 2
Cracks/damage/wear → Replace the defec-
tive part(-s).
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance a
(between inner rotor 1 and outer rotor 2)
• Outer-rotor-to-oil-pump-housing clearance b
(between outer rotor 2 and pump housing 3)
Out of specifications → Replace oil pump
assembly.
Inner-rotor-to-outer-rotor-tip clear-
ance:
0.09 ~ 0.15 mm (0.004 ~ 0.006 in)
Outer-rotor-to-oil-pump-housing
clearance:
0.03 ~ 0.08 mm (0.001 ~ 0.003 in)
ENG