Oil Pump: Service and Repair

PUMP-OIL

REMOVAL
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 position is at 6° ATDC of No.1 cylinder, or crankshaft sprocket mark aligns with mark on oil pump (1). This position will properly locate oil pump upon installation.





7. Remove oil pump attaching bolts (1).
8. Remove oil pump (5).

DISASSEMBLY

NOTE: DO NOT remove oil pressure relief valve. If the oil pressure relief valve is suspect, replace the oil pump assembly.





1. Remove oil pump cover screws (2) and lift off oil pump cover (1).
2. Remove inner pump rotor (3) and outer pump rotor (5).
3. Wash all parts in a suitable solvent.
4. Inspect components carefully for damage or wear.

CLEANING
1. Clean all parts thoroughly in a suitable solvent.

INSPECTION

NOTE: DO NOT remove oil pressure relief valve. If the oil pressure relief valve is suspect, replace the oil pump assembly.

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 (1) across the pump cover (3) surface. If a 0.025 mm (0.001 inch) feeler gauge (2) 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, or if the diameter is 89.174 mm (3.5108 inch) or less, replace outer rotor.





6. Measure the inner rotor, if inner rotor measures 9.474 mm (0.373 inch) or less replace inner rotor.





7. Slide outer rotor into body, press to one side with fingers and measure clearance between rotor and body (2). If measurement is 0.39 mm (0.015 inch) or more, replace body only if outer rotor is in specifications.





8. Install inner rotor (3) into body. If clearance between inner rotor (3) and outer rotor (1) is 0.20 mm (0.008 inch) or more, replace both rotors.





9. Place a straightedge (1) across the face of the body, between bolt holes. If a feeler gauge (2) of 0.077 mm (0.003 inch) or more can be inserted between rotors and the straightedge, replace pump assembly ONLY if rotors are in specification.
10. Assemble oil pump.

ASSEMBLY
1. Assemble pump using new parts as required.





2. Tighten cover screws (2) to 12 Nm (105 inch lbs.).
3. 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 (1). 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 600 ATDC of No.1 cylinder (1) 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 Nm (250 inch 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 (1) to 28 Nm (250 inch 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.