Yamaha YFM660RN, Service Manual, Page: 236 / 328

5 - 56
ENG
OIL PUMP
CHECKING THE OIL PUMP
1.Check:
●
Oil pump driven gear
●
Oil pump housings
●
Oil pump housing cover
Cracks/wear/damage
→
Replace.
2.Measure:
●
Tip clearance
a
(between the inner rotor
1
and the outer
rotor
2
)
●
Side clearance
b
(between the outer rotor
2
and the pump
housing
3
)
Out of specification
→
Replace the oil pump.
Tip clearance
a
:
0.12 mm (0.005 in)
<Limit>: 0.2 mm (0.008 in)
Side clearance
b
:
0.03 ~ 0.08 mm (0.001 ~ 0.003 in)
3.Check:
●
Oil pump operation
Unsmooth
→
Repeat steps (1) and (2) or
replace the defective parts.
ASSEMBLING THE OIL PUMP
1.Install:
●
Oil pump inner rotor 2
●
Oil pump outer rotor 2
NOTE:
Align the match mark
a
on the inner rotor 2
with the match mark
b
on the outer rotor 2.