Oil Pump: Service and Repair
OIL PUMPREMOVAL
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 and O-ring (Fig. 99).
6. Ensure that crankshaft position is at 60° ATDC of No.1 cylinder, or crankshaft sprocket mark aligns with mark on oil pump (Fig. 98). This position will properly locate oil pump upon installation.
7. Remove oil pump attaching bolts (Fig. 99).
8. Remove oil pump.
DISASSEMBLY
1. Remove the pressure relief valve by remove the threaded retaining cap from the oil pump housing.
CAUTION: Oil pump pressure relief valve must be installed as shown in (Fig. 100) or engine damage may occur.
2. Remove spring and relief valve.
3. Remove oil pump cover screws and lift off cover plate (Fig. 101).
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
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 (Fig. 102). If a 0.025 mm (0.001 inch) feeler gauge can be inserted between cover and straight edge, cover should be replaced.
5. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 9.474 mm (0.373 inch) or less (Fig. 103), or if the diameter is 89.174 mm (3.5108 inch) or less, replace outer rotor.
6. If inner rotor measures 9.474 mm (0.373 inch) or less replace inner rotor (Fig. 104).
7. Slide outer rotor into body press to one side with fingers and measure clearance between rotor and body (Fig. 105). If measurement is 0.39 mm (0.015 inch) or more, replace body only if outer rotor is in specifications.
8. Install inner rotor into body If clearance between inner and outer rotors (Fig. 106) is 0.20 mm (0.008 inch) or more, replace both rotors.
9. Place a straightedge across the face of the body, between bolt holes. If a feeler gauge of 0.077 mm (0.003 inch) or more can be inserted between rotors and the straightedge, replace pump assembly (Fig. 107) 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 inch) it should test between 23 - 25 pounds when compressed to 34 mm (1.34 inch). 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 Nm (105 inch lbs.) (Fig. 101).
3. Tighten oil pressure relief valve retaining cap to 12 Nm (105 inch lbs.) (Fig. 100).
4. Prime oil pump before installation by filling rotor cavity with engine oil.
INSTALLATION
CAUTION: Crankshaft position must be at 600 ATDC of No.1 cylinder before installing oil pump (Fig. 98). This position will properly locate oil pump. If not properly located, severe damage to oil pump can occur.
1. Prime oil pump before installation by filling rotor cavity with engine oil.
2. If crankshaft has been rotated, it must be repositioned to 60' ATDC of No.1 cylinder prior to oil pump installation (Fig. 98).
3. Install oil pump carefully over crankshaft and into position.
4. Install oil pump attaching bolts. Tighten bolts to 28 Nm (250 inch lbs.) (Fig. 99).
5. Install oil pick-up tube with new O-ring. Lubricate O-ring before installation. Tighten attaching bolts to 28 Nm (250 inch lbs.) (Fig. 99).
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.