Oil Pump: Service and Repair

REMOVAL AND INSTALLATION

CAUTION: When removing the oil pans, oil pump assembly and timing chain from engine, first remove the crankshaft position sensor (POS) from the assembly.
Be careful not to damage sensor edge.

1. Drain engine oil.
2. Remove drive belts.
3. Remove crankshaft position sensor (POS).
4. Remove engine under covers.
5. Remove crankshaft pulley.
6. Remove front exhaust tube and its support.
7. Support engine at right and left side engine slingers with a suitable hoist.
8. Remove engine right side mounting insulator and bracket bolts and nuts.
9. Remove center member assembly.
10. Remove air compressor assembly and bracket.
11. Remove oil pans.
12. Remove front timing chain case.
13. Remove timing chain.
14. Remove oil pump assembly.
15. Reinstall any parts removed in reverse order of removal.

DISASSEMBLY AND ASSEMBLY





^ When installing oil pump, apply engine oil to rotors.

OIL PUMP INSPECTION





Using a feeler gauge, straight edge and micrometers, check the clearances:












^ If the tip clearance (2) exceeds the limit, replace rotor set.
^ If body to rotor clearances (1, 3, 4, 5) exceed the limit, replace oil pump body assembly.

REGULATOR VALVE INSPECTION
1. Visually inspect components for wear and damage.





2. Check oil pressure regulator valve sliding surface and valve spring.
3. Coat regulator valve with engine oil. Check that it falls smoothly into the valve hole by its own weight.
If damaged, replace regulator valve set or oil pump body.





4. Check regulator valve to oil pump body clearance.
Clearance: 0.040 - 0.097 mm (0.0016 - 0.0038 inch)
If it exceeds the limit, replace oil pump body.