Subaru 2009 IMPREZA Service Manual page 375

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E: INSPECTION

1. TIP CLEARANCE

Measure the tip clearance of rotors. If the clearance

is out of specification, replace the rotors as a set.

Tip clearance:

0.04 — 0.14 mm (0.0016 — 0.0055 in)

2. CASE CLEARANCE

Measure the clearance between the outer rotor and

the oil pump case. If clearance is out of standard,

replace the oil pump case.

Case clearance:

0.10 — 0.175 mm (0.0039 — 0.0069 in)

3. SIDE CLEARANCE

Measure the gap between the inner rotor and the

oil pump case to measure the clearance between

the oil pump inner rotor and the oil pump cover as

shown in the figure. If clearance is out of standard,

replace the rotor or the oil pump case.

Side clearance:

Specification:

0.02 — 0.07 mm (0.0008 — 0.0028 in)

4. OIL RELIEF VALVE

Check the valve for assembly condition and dam-

age, and the relief valve spring for damage and de-

terioration.

Replace the parts if defective.

Relief valve spring:

73.7 mm (2.902 in)

Installed length

54.7 mm (2.154 in)

Load when installed

93.1 N (9.49 kgf, 20.88 lbf)

5. OIL PUMP CASE

Check the oil pump case for worn shaft hole,

clogged oil passage, worn rotor chamber, cracks

and other faults.

6. FRONT OIL SEAL

Check the front oil seal lips for deformation, hard-

ening, wear, etc. and replace if defective.