Removal
1. Remove the crankshaft toothed pulley and its key (see "Front Crankshaft Oil Seal - Replacement").
2. Remove the crankshaft position sensor (see "Crankshaft Position Sensor - Removal, Checking and Installation").
3. Remove the oil intake (see "Oil intake - removal and installation").
4. Using a 10 mm socket wrench, unscrew the six bolts securing the oil pump to the cylinder block.
5. Remove the oil pump from the engine.
6. Remove the remains of the sealing gasket from the mating surface of the cylinder block.
Disassembly
1. Using a 5 mm Allen key, unscrew the six bolts holding the pump body and cover together.
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2. Disconnect the pump body and cover.
3. Remove the drive gear from the cover.
4. Remove the driven gear from the housing.
Recommendation. Pressure reducing plug (safety) the valves are tightened with a high torque. When unscrewing it, you may accidentally damage the pump cover. Also, the edges of the key on the plug itself are damaged. Therefore, do not disassemble the valve unless necessary. You can flush the valve without disassembling it.
5. Wash the pump parts with diesel fuel or kerosene, wipe dry and lubricate the gears with clean motor oil.
Examination
1. Inspect the oil pump parts. They should not show signs of severe wear, metal build-up, cracks or other damage.
2. Using a caliper, measure the diameter of the mounting hole of the driven gear in the pump body and the thickness of the partition between the driven and driving gears.
The diameter of the seat of the driven gear in the pump body should not exceed 75.1 mm. The minimum thickness of the dividing wall between the driving and driven gears is 3.4 mm.
3. Using a micrometer, measure the thickness of the driven and driving gears. If the driven gear is thinner than 7.35 mm and the driving gear is 7.41 mm, then we replace the gears.
4. Place the drive gear into the oil pump housing. By placing the edge of a metalworking ruler against the mating surface of the oil pump housing, we use a set of flat feeler gauges to determine the gap between the edge of the ruler and the gear. We repeat the check with the driven gear.
If the gap between the ruler and the drive gear is more than 0.12 mm (or 0.15 mm for the driven gear), the gears must be replaced.
Assembly
Advice: On the removed pump, it is recommended to replace the front crankshaft oil seal installed in the pump cover (see "Front Crankshaft Oil Seal - Replacement").
We assemble the pump in the reverse order of removal. In this case, the driven gear must be installed in the pump so that the side with the mark and chamfers on the teeth faces the housing.
The drive gear must be oriented in the same way during installation: with the chamfers on the teeth facing the pump body.
Installation
We install the oil pump in the reverse order of removal, replacing the gasket between the pump and the cylinder block with a new one.