Removal

Fig. 275: Oil Pump & Pick-up Tube

1. - BOLTS
2. - O-RING
3. - PICK-UP TUBE
4. - BOLT
5. - OIL PUMP

NOTE: The oil pump pressure relief valve can be serviced by removing the oil pan.

1. Remove crankshaft vibration damper.

2. Remove timing chain cover.

3. Remove timing chain and sprockets.

4. Remove oil pan.

5. Remove oil pick-up tube (3) and O-ring (2).

6. Ensure that crankshaft is positioned so that the oil pump drive flats are parallel to the oil pan mounting surface This position will properly locate oil pump upon installation.

7. Remove oil pump attaching bolts (1).

8. Remove oil pump (5).

Disassembly

Fig. 276: Oil Pressure Relief Valve

1. - RELIEF VALVE
2. - SPRING
3. - RETAINER CAP

1. Remove the pressure relief valve (1) by remove the threaded retaining cap from the oil pump housing.

CAUTION: Oil pump pressure relief valve must be installed as shown in illustration or engine damage may occur.

2. Remove spring and relief valve.

Fig. 277: Oil Pump

1. - OIL PUMP COVER
2. - SCREWS (8)
3. - OIL PUMP INNER ROTOR
4. - OIL PUMP HOUSING
5. - OIL PUMP OUTER ROTOR

3. Remove oil pump cover screws (2) and lift off cover plate.

4. Remove pump rotors.

5. Wash all parts in a suitable solvent.

6. Inspect components carefully for damage or wear.

Cleaning

1. Clean all parts thoroughly in a suitable solvent.

Inspection

Fig. 278: CHECKING OIL PUMP COVER FLATNESS - TYPICAL

1. - STRAIGHT EDGE
2. - FEELER GAUGE
3. - OIL PUMP COVER

1. Disassemble the oil pump.

2. Clean all oil pump components.

3. Inspect mating surface of the oil pump housing and cover. Replace oil pump if deeply scratched or grooved (minor surface scratches and polishing is normal).

4. Lay a straightedge across the pump cover surface (3). If a 0.025 mm (0.001 in.) feeler gauge can be inserted between cover and straight edge, cover should be replaced.

Fig. 279: MEASURING OUTER ROTOR THICKNESS

5. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 9.474 mm (0.373 in.) or less, or if the diameter is 89.174 mm (3.5108 in.) or less, replace outer rotor.

Fig. 280: MEASURING INNER ROTOR THICKNESS

6. If inner rotor measures 9.474 mm (0.373 in.) or less replace inner rotor.

Fig. 281: MEASURING OUTER ROTOR CLEARANCE IN HOUSING

1. - FEELER GAUGE
2. - OUTER ROTOR

7. Slide outer rotor into body, press to one side with fingers and measure clearance between rotor and body.

If measurement is 0.39 mm (0.015 in.) or more, replace body only if outer rotor is in specifications.

Fig. 282: MEASURING CLEARANCE BETWEEN ROTORS

1. - OUTER ROTOR
2. - FEELER GAUGE
3. - INNER ROTOR

8. Install inner rotor into body. If clearance between inner and outer rotors is 0.20 mm (0.008 in.) or more, replace both rotors.

Fig. 283: MEASURING CLEARANCE OVER ROTORS

1. - STRAIGHT EDGE
2. - FEELER GAUGE

9. Place a straightedge across the face of the body, between bolt holes. If a feeler gauge of 0.077 mm (0.003 in.) or more can be inserted between rotors and the straightedge, replace pump assembly ONLY if rotors are in specification.

10. Inspect oil pressure relief valve plunger for scoring and free operation in its bore. Small marks may be removed with 400-grit wet or dry sandpaper.

11. The relief valve spring has a free length of approximately 49.5 mm (1.95 in.) it should test between 23 - 25 pounds when compressed to 34 mm (1.34 in.). Replace spring that fails to meet specifications.

12. Assemble oil pump.

Assembly

1. Assemble pump using new parts as required.

2. Tighten cover screws to 12 N.m (105 in. lbs.).

3. Tighten oil pressure relief valve retaining cap to 12 N.m (105 in. lbs.).

4. Prime oil pump before installation by filling rotor cavity with engine oil.

Installation

Fig. 284: Oil Pump & Pick-up Tube

1. - BOLTS
2. - O-RING
3. - PICK-UP TUBE
4. - BOLT
5. - OIL PUMP

CAUTION: The crankshaft oil pump drive flats must be parallel to the oil pan mounting surface before installing the oil pump. This position will properly locate the oil pump. If not properly located, severe damage to the oil pump can occur.

1. Prime the oil pump before installation by filling rotor cavity with engine oil.

2. If the crankshaft has been rotated, it must be repositioned so that the oil pump drive flats are parallel to the oil pan mounting surface prior to oil pump installation.

3. Install oil pump (5) carefully over crankshaft and into position.

4. Install oil pump attaching bolts (1). Tighten bolts to 28 N.m (250 in. lbs.).

5. Install oil pick-up tube (3) with new O-ring (2). Lubricate O-ring (2) with clean engine oil before installation. Tighten attaching bolts to 28 N.m (250 in. lbs.).

6. Install oil pan.

7. Install timing chain and sprockets.

8. Install timing chain cover.

9. Install crankshaft vibration damper.

10. Fill crankcase with engine oil to correct level.