Oil Pump: Service and Repair

PUMP - OIL

REMOVAL





1. Drain the cooling system.
2. Remove the timing belt.
3. Remove the crankshaft sprocket.
4. Remove the oil pan.





5. Remove the oil pickup tube.





6. Remove the oil pump fasteners. Remove the oil pump (1) and gasket (2) from engine.

DISASSEMBLY





1. Remove oil pump cover screws (3) and lift off cover (4).
2. Remove pump rotors (2, 5).
3. Wash all parts in a suitable solvent and inspect carefully for damage or wear.

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

INSPECTION





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

1. Disassemble oil pump.
2. Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. Replace pump cover if scratched or grooved.
3. Lay a straightedge (1) across the pump cover (3) surface. If a 0.025 mm (0.001 inch) feeler gauge can be inserted between cover and straight edge, cover should be replaced.





4. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 14.299 mm (0.563 inch) or less, or if the diameter is 79.78 mm (3.141 inches.) or less, replace outer rotor.





5. If inner rotor measures 14.299 mm (0.563 inch) or less replace inner rotor.





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





7. Install inner rotor into body. If clearance between inner (3) and outer rotors (2) is 0.20 mm (0.008 inch) or more, replace both rotors.





8. Place a straightedge (1) 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 ONLY if rotors are in specs.
9. Assemble oil pump.

ASSEMBLY





1. Assemble oil pump using new parts as required.
2. Tighten cover screws (3) to 12 Nm (105 inch lbs.).
3. Prime oil pump before installation by filling rotor cavity with engine oil.
4. If oil pressure is low and pump is within specifications, inspect for worn engine bearings or other reasons for oil pressure loss.

INSTALLATION





1. Prime oil pump (4) before installation by filling rotor cavity with clean engine oil.
2. Install oil pump (4) and gasket (3) carefully over the crankshaft. Position pump onto block and tighten bolts to 28 Nm (250 inch lbs.).





3. Install new O-ring (3) on oil pickup tube (1).
4. Install oil pickup tube (1).
5. Install oil pan.
6. Install crankshaft sprocket.
7. Install timing belt.
8. Install the timing belt covers.





9. Install the crankshaft vibration damper (4).
10. Install the accessory drive belt (6).
11. Fill the cooling system.
12. Fill engine crankcase with proper oil to the correct level.