Removing The Crankshaft; Checking The Oil Pump - Yamaha YXR70FX Service Manual

1
CRANKSHAFT AND OIL PUMP
EBS00336

REMOVING THE CRANKSHAFT

1. Remove:
• crankshaft 1
Use a crankcase separating tool 2.
2
EBS00331

CHECKING THE OIL PUMP

1. Check:
• oil pump housing
• oil pump housing cover
Cracks/wear/damage → Replace.
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.
1 Inner rotor
2 Outer rotor
3 Oil pump housing
3. Check:
• oil pump operation
Rough movement → Repeat steps (1) and
(2) or replace the defective part(s).
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ENG
Crankcase separating tool
90890-01135
Crankcase separator
YU-01135-B
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 ~ 0.170 mm
(0.0035 ~ 0.0067 in)
<Limit>: 0.24 mm (0.0094 in)
Oil-pump-housing-to-inner-rotor-
and-outer-rotor clearance
0.030 ~ 0.100 mm
(0.0012 ~ 0.0039 in)
<Limit>: 0.17 mm (0.0067 in)