Removal
1. Remove the timing belt and timing drive gears (see section Removal and installation the timing belt and timing drive gears). Remove the oil pan (see section Removal and installation the engine oil pan).
2. Remove the generator adjusting bar and unscrew the bolt securing the bar to the oil pump (see Chapter Engine electrical equipment).
3. Unbolt the steering pump assembly (see Chapter Suspension and steering) and move it to the side without disconnecting the hydraulic lines. Remove the steering pump mounting bracket.
4. Remove the bolts securing the oil pump to the engine block.
Note: The oil pickup tube with filter attachment may be left connected to the pump. One of the pump assembly mounting bolts is the long alternator adjuster bar mounting bolt that was removed in step 2.
5. In order to destroy the sealant layer, tap the pump assembly with a hammer through a wooden block.
6. Pull outward to remove the pump from the engine block.
7. Scrape off all traces of sealant and fragments of old gasket material from the mating surfaces of the pump and engine block, then wipe the surfaces with a rag soaked in acetone.
Examination
1. Using a large Phillips-head screwdriver, remove the screws securing the rear cover of the oil pump.
2. Wash all components in solvent, then inspect them for signs of excessive wear and mechanical damage.
3. Remove the plug and take out the components of the pressure reducing valve. Assess the condition of the sliding surface of the valve and its spring. If defects are found, replace the components as a set.
1 - Plug
2 — Washer
3 - Spring
4 — Valve
4. Using a blade-type feeler gauge, determine the working clearances of the pump gears. The following clearances are subject to inspection:
- a) Axial clearance of the seat of the internal gear in the pump body;
- b) Axial clearance of the outer gear seat in the pump body;
- c) Clearance between the generating surface of the external gear and the pump body;
- d) Clearance between the teeth of the outer gear and the crescent partition;
- e) Clearance between internal gear teeth and crescent partition;
Compare the measurement results with the requirements of the Specifications. If necessary, replace the pump assembly.
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5. Fill the pump with technical petroleum jelly. Replace the cover and tighten the screws to the required torque. Replace the components of the pressure reducing valve, screw in and tighten the plug.
6. After replacing the sealing ring, connect the oil intake tube to the pump assembly. Tighten the tube mounting bolts to the required torque.
Installation
1. Lubricate the mating surface of the pump with RTV sealant.
2. Install the components in the reverse order of their dismantling. Do not forget to replace the sealing gaskets.
Note: The flats on the pump internal gear hub must engage with the corresponding flats on the crankshaft journal. Make sure all fasteners are tightened to the required torque.