Checking The Oil Pump; Checking The Oil Pump Drive Chain - Yamaha YP400T Service Manual

OIL PUMP
EAS00364

CHECKING THE OIL PUMP

1. Check:
• oil pump drive sprocket
• 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
b
• oil-pump-housing-to-inner-rotor-and-outer-
rotor clearance c
Out of specification → Replace the oil
pump.
1 Inner rotor
2 Outer rotor
3 Oil pump housing
Inner-rotor-to-outer-rotor-tip
clearance
0.07 mm (0.0028 in)
<Limit>: 0.15 mm (0.0059 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
0.040 ~ 0.096 mm
(0.0016 ~ 0.0038 in)
<Limit>: 0.166 mm (0.0065 in)
3. Check:
• oil pump operation
Rough movement → Repeat steps (1) and
(2) or replace the defective part(s).

CHECKING THE OIL PUMP DRIVE CHAIN

1. Check:
• oil pump drive chain
Cracks/stiffness → Replace the oil pump
chain, oil pump drive and driven sprocket as
a set.
5 - 57
ENG
clearance