Subaru Impreza 2003 Service Manual page 363

E: INSPECTION
1. TIP CLEARANCE
Measure the tip clearance of rotors. If clearance ex-
ceeds the limit, replace the rotors as a matched set.
Tip clearance:
Standard
0.04 — 0.14 mm (0.0016 — 0.0055 in)
Limit
0.18 mm (0.0071 in)
2. CASE CLEARANCE
Measure the clearance between the outer rotor and
oil pump rotor housing. If clearance exceeds the
limit, replace the rotor.
Case clearance:
Standard
0.10 — 0.175 mm (0.0039 — 0.0069 in)
Limit
0.20 mm (0.0079 in)
OIL PUMP
3. SIDE CLEARANCE
Measure the clearance between the oil pump inner
rotor and pump cover. If clearance exceeds the lim-
it, replace the rotor or pump body.
Side clearance:
Standard
0.02 — 0.07 mm (0.0008 — 0.0028 in)
Limit
0.12 mm (0.0047 in)
LU-00023
4. OIL RELIEF VALVE
Check the valve for fitting condition and damage,
and the relief valve spring for damage and deterio-
ration. Replace the parts if defective.
Relief valve spring:
Free length
72.8 mm (2.866 in)
Installed length
54.7 mm (2.154 in)
Load when installed
81.3 N (8.29 kgf, 18.24 lb)
5. OIL PUMP CASE
Check the oil pump case for worn shaft hole,
clogged oil passage, worn rotor chamber, cracks,
and other faults.
6. OIL SEAL
Check the oil seal lips for deformation, hardening,
wear, etc. and replace if defective.
LU-00024
LU(H4SO)-13
LUBRICATION
LU-00025