Infinity_QX56_2004-2005

## Inspection

1. Remove the oil pump from the engine.
2.
3. Remove the oil pump cover.
4.
5. Remove the inner and outer rotors from the oil pump body.
6.
7. Remove the regulator plug, regulator spring and regulator valve.
8.
9. Measure the radial clearance using a feeler gauge. Body to outer rotor (position 1) should be 0.0045-0.0079 inch. Inner rotor to outer tip (position 2) should be 0.0071 inch.

Fig. Oil pump radial clearance measurement

10.
11. Measure the side clearance using a feeler gauge. Body to inner rotor (position 3) should be 0.0012-0.0028 inch. Body to outer rotor (position 4) should be 0.0012-0.0035 inch.

Fig. Oil pump side clearance measurement

12.
13. Calculate the clearance between the inner rotor and the oil pump body as follows.
14.
15. Measure the outer diameter of the protruded portion of the inner rotor (position 5) using a feeler gauge. Measure the inner diameter of the oil pump body to the brazed portion (position 6) using a feeler gauge. Calculate the clearance using the following formula. Clearance=Inner diameter of oil pump body-Outer diameter of inner rotor. Inner rotor to brazed portion of housing clearance specification is 0.0018-0.0036 inch.

Fig. Oil pump inner rotor and pump body clearance measurement

Fig. Oil pump inner diameter clearance measurement

16.
17. Check the regulator valve to oil pump cover clearance using the following formula. Clearance=D1 (valve hole diameter)- D2 (outer diameter of valve). Regulator valve to oil pump specification should be 0.0016-0.0038 inch.
NOTE
Coat the valve with clean engine oil. Check that it falls smoothly into the regulator valve hole by its own weight.

Fig. Oil pump regulator valve clearance measurement

18.
19. Assemble the oil pump in the reverse order.
20.
21. Install the inner and outer rotor with the punched marks on the oil pump cover side.

Fig. Oil pump punch mark location

22.

## Removal & Installation

1. Before servicing the vehicle, refer to the Precautions Section.
2.
3. Remove or disconnect the following:

Timing chain cover

Oil pump drive spacer

Oil pump

Fig. Oil pump exploded view

4.

To install:

1. Install or connect the following:

Oil pump

Oil pump drive spacer

Timing chain cover

2.