Subaru Legacy 2004 Service Manual page 1267

LUBRICATION
3. SIDE CLEARANCE
Measure the clearance between oil pump inner ro-
tor and pump cover. If the clearance exceeds the
standard value, replace the rotor or pump body.
Side clearance:
Standard value
0.02 — 0.07 mm (0.0008 — 0.0028 in)
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
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 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.
Oil Pump
LU-00025
LU(H4DOTC)-12