Yamaha WR45OFR service manual Assembly and Installation Oil pump

OIL PUMP

ENG

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:

0.12mm 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.

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