V8 Engine 3.5 3.9 4.2
ENGINE
OVERHAUL
27
Oil pump - inspection
1. Throughly clean oil pump gear housing, cover
and gears.
2. Clean oil pressure relief valve bore in housing.
3. Clean relief valve filter screen.
4. Inspect pump gears for wear and scoring.
5. Fit pump gears into housing.
6. Place straight edge across gears.
7. Check clearance between straight edge and
cover face.
Gear to cover face minimum clearance = 0.05
mm (0.002 in).
If clearance is below minimum specified check
gear recess in housing for wear. Renew
housing if necessary.
8. Remove oil pump gears from housing.
9. Clean oil pressure relief valve and spring.
10. Inspect relief valve for wear and scoring.
11. Inspect relief valve spring for wear or signs of
collapse.
Relief spring free length = 81.28 mm (3.2 in)
12. Check relief valve slides freely in its bore with
no perceptible side movement.
Oil pump - refit
1. Lubricate relief valve, spring, and bore in
housing with clean engine oil.
2. Fit relief valve and valve spring.
3. Fit new sealing washer to plug, fit plug and
tighten to 45 Nm (33 lbf.ft).
4. Pack oil pump housing with Petroleum Jelly.
CAUTION: Use only Petroleum Jelly, no
other grease is suitable.
5. Fit oil pump gears ensuring that Petroleum
Jelly is forced into every cavity between teeth
of gears.
CAUTION: Unless pump is fully packed
with Petroleum Jelly it may not prime itself
when the engine is started.
6. Fit new pump cover gasket, dry.
7. Position cover, fit bolts and tighten
progressively to 12 Nm (9 lbf.ft).
8. Fit oil cooler adapter.
9. Fit timing cover.
10. Fit distributor.
11. Fit sump.
