Yamaha YZ450F, Owner'S Service Manual

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4 - 68
ENG
OIL PUMP
INSPECTION
Oil pump
1. Inspect:
• Oil pump drive gear
• Oil pump driven gear
• Rotor housing
• Oil pump cover
Cracks/wear/damage
→
Replace.
2. Measure:
• Tip clearance
a
Between the inner rotor
1
and the outer
rotor
2
.
• Tip clearance
b
Between the outer rotor
2
and the rotor
housing
3
.
Out of specification
→
Replace the oil
pump.
Tip clearance
a
:
0.12 mm or less
(0.0047 in or less)
<Limit>: 0.20 mm (0.008 in)
Tip clearance
b
:
0.09 ~ 0.17 mm (0.0035 ~ 0.0067 in)
<Limit>: 0.24 mm (0.009 in)
Side clearance
c
:
0.03 ~ 0.10 mm (0.0012 ~ 0.0039 in)
<Limit>: 0.17 mm (0.007 in)
3. Check:
• Unsmooth
→
Repeat steps #1 and #2 or
replace the defective parts.
ASSEMBLY AND INSTALLATION
Oil pump
1. Install:
• Oil pump drive shaft
1
• Washer
2
• Pin
3
• Inner rotor 1
4
NOTE:
• Apply the engine oil on the oil pump drive
shaft and inner rotor 1.
• Fit the pin into the groove in the inner rotor 1.