Yamaha YFM660FS, Supplementary Service Manual

Page: 287 / 478

4 - 74
ENG
CRANKSHAFT AND OIL PUMP
REMOVING THE CRANKSHAFT
1.Remove:
●
Crankshaft
Use a crankcase separating tool
1
.
Crankcase separating tool:
P/N. YU-01135-A, 90890-01135
CHECKING THE OIL PUMP
1.Check:
●
Rotor housings
●
Rotor 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
:
0.03 ~ 0.10 mm
(0.0012 ~ 0.0039 in)
<Limit>: 0.15 mm (0.006 in)
Side clearance
b
:
0.03 ~ 0.10 mm
(0.0012 ~ 0.0039 in)
<Limit>: 0.12 mm (0.005 in)
3.Check:
●
Oil pump operation
Unsmooth
→
Repeat steps #1 and #2 or
replace the defective parts.