Maxima 4 (1994-1999)

Removal, inspection and installation of the oil pump (Nissan Maxima A32)

Table of contents: Removal ↓ Examination ↓ Installation ↓

Removal

1. Remove the main timing chain with sprockets (see section Removal, condition check and installation of timing chain and sprockets).

Note: If necessary, also remove the secondary chain tensioner/guide assembly to provide adequate access to the pump.

2. Remove both sections of the engine oil pan (see section Removal and installation the engine oil pan) and oil intake pipe.

3. Unscrew the bolts securing the oil pump to the front wall of the power unit.

4. Carefully pry up the pump casing and carefully remove it from the guide pins on the block.

Examination

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1. Using a large Phillips-head screwdriver, remove the screws securing the front cover of the oil pump.

2. Wash the internal components of the assembly in solvent and carefully inspect for signs of excessive wear and mechanical damage.

3. Unscrew the plug and remove the pressure reducing valve components from the pump body. Assess the condition of the valve working surfaces and its springs. If defective components are detected, replace the entire set.

1 - Plug; 2 - Washer; 3 - Outer spring; 4 - Inner spring; 5 - Valve; 6 - Oil pump housing

4. Using a blade-type feeler gauge, measure the working clearances of the oil pump gears. Compare the measurement results with the requirements of the Specifications. The following parameters should be determined during this check:

a) Clearance between the teeth of the internal and external gears;
b) Clearance between the generating surface of the outer gear and the housing;
c) Axial clearance of the internal gear seat
d) Axial clearance of the outer gear seat;
e) Radial clearance of the protruding hub portion of the internal gear in the pump housing (calculated by subtracting the results of two measurements.

If any of the parameters go beyond the permissible range, the pump assembly must be replaced.

5. Fill the pump cavities with technical petroleum jelly. Insert the internal components into the housing, install the cover and tighten the screws firmly. Install the carburetors of the pressure reducing valve in place, tighten the plug firmly.

Installation

Assembly is performed in the reverse order of disassembly. Do not forget to replace all sealing gaskets. Make sure that the chamfers in the hub part of the internal gear of the pump correctly engage with the corresponding chamfers on the crankshaft journal. Tighten all fasteners with the required force.