OIL PUMP - ENGINE NUMBERS WITHOUT SUFFIX B

Oil pump - remove

1. Remove sump.
2. Remove distributor.
3. Remove timing cover.
4. Remove oil cooler adapter - if fitted.
5. Remove oil pressure relief valve plug, discard sealing washer.
6. Withdraw pressure relief valve spring and valve.
7. Remove oil pressure switch, discard sealing washer.
8. Remove bolts securing oil pump cover.
9. Remove cover, remove and discard gasket.
10. Withdraw oil pump gears.

 

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 housing face.
Gear to housing minimum clearance = 0.05mm.
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 valve free length = 81.28 mm.
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 correct torque.
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.
7. Position cover, fit bolts and tighten progressively to correct torque.
8. Fit oil cooler adapter.
9. Fit timing cover.
10. Fit distributor.
11. Fit sump.

OIL PUMP - ENGINE NUMBERS WITH SUFFIX B

Note: Overhaul procedures for the oil pump and oil pressure relief valve are limited to carrying out dimensional checks. In the event of wear or damage being found, a replacement timing cover assembly must be fitted.

Oil pump - remove

1. Remove timing cover.
2. Remove oil pump drive gear.
3. Remove 9 screws securing cover plate, remove plate.
4. Make suitable alignment marks on inner and outer rotors, remove rotors.

Oil pressure relief valve - remove

1. Remove circlip.
2. Remove relief valve plug, remove and discard’ O’ ring.
3. Remove relief valve spring and piston.

 

Oil pump - inspection

1. Thoroughly clean oil pump drive gear, cover plate, rotors and housing. Remove all traces of Loctite from cover plate securing screws; ensure tapped holes in timing cover are clean and free from oil.
2. Check mating surfaces of cover plate, rotors and housing for scoring.
3. Assemble rotors and oil pump drive gear in housing ensuring that reference marks are aligned.
4. Using feeler gauges, check clearance between teeth of inner and outer rotors: Maximum clearance = 0.25 mm
5. Remove oil pump drive gear, check depth of any wear steps on gear teeth: Wear step maximum depth = 0.15 mm

6. Place a straight edge across housing.
7. Using feeler gauges, check clearance between straight edge and rotors: Maximum clearance = 0.1 mm

Oil pressure relief valve - inspection

1. Clean relief valve components and piston bore in timing cover.
2. Check piston and bore for scoring and that piston slides freely in bore with no perceptible side movement.
3. Check relief valve spring for damage and distortion; check spring free length: Spring free length = 60.0 mm

Oil pump - refit

1. Lubricate rotors, oil pump drive gear, cover plate and housing with engine oil.
2. Assemble rotors in housing ensuring that reference marks are aligned.
3. Position cover plate to housing.
4. Apply Loctite 222 to threads of cover plate screws, fit but do not fully tighten screws.
5. Position drive gear in oil pump, tighten cover plate screws to correct torque.
6. Fit timing cover.

Oil pressure relief valve - refit

1. Lubricate new ’O’ ring with engine oil and fit to relief valve plug.
2. Lubricate relief valve spring, piston and piston bore with engine oil.
3. Assemble piston to relief valve spring, insert piston and spring into piston bore.
4. Fit relief valve plug, depress plug and fit circlip.
5. Ensure circlip is fully seated in groove.