Oil Pump Inspection - Yamaha WR250F(P) Owner's Service Manual

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OIL PUMP
INSPECTION
Oil pump
1. Inspect:
Oil pump drive gear 1
G
Oil pump drive shaft 2
G
Rotor housing 3
G
Oil pump cover 4
G
Cracks/wear/damage → Replace.
2. Measure:
Tip clearance a
G
(between the inner rotor 1 and outer
rotor 2)
Side clearance b
G
(between the outer rotor 2 and rotor
housing 3)
Housing and rotor clearance c
G
(between the rotor housing 3 and
rotors 1 2)
Out of specification → Replace the oil
pump assembly.
Tip clearance a:
0.12 mm or less
(0.0047 in or less)
<Limit>: 0.20 mm (0.008 in)
Side clearance b:
0.09 ~ 0.17 mm (0.0035 ~ 0.0067 in)
<Limit>: 0.24 mm (0.009 in)
Housing and rotor clearance c:
0.03 ~ 0.10 mm (0.0012 ~ 0.0039 in)
<Limit>: 0.17 mm (0.0067 in)
3. Check:
Unsmooth → Repeat steps #1 and #2
G
or replace the defective parts.
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ENG