Oil pump parts
1 Drive unit for distributor (if it is installed)
2 Oil pump drive
3 Oil pump housing
4 Pinion with shaft
5 Gate valve
6 driven gear
7 Spring
8 Oil pump cover
9 O-ring
10 Oil suction pipe
11 Oil deflector
12 Bolt
13 Bolt M6x22
14 Bolt М8х90
15 snap ring
Oil pumps for five-cylinder engines
1 inner rotor
2 Outer rotor
3.5 gears
4 Serpic.
Withdrawal
Remove oil pump.
Loosen the oil pump housing bolts.
Pull the pump down until the shaft disengages and then pull it out completely.
If installed, also remove the ignition distributor, as it must be removed when installing the pump.
Installation
Installation is made in an order, the return to removal.
The pump is mounted on the engine crankcase without a gasket. Tighten bolts to 2Nm.
Before installing the distributor, turn the oil pump drive shaft with pliers so that the surfaces of the pins lie parallel to the longitudinal axis of the crankshaft. After that, insert the distributor or bushing with an o-ring (some models).
Check the ignition if the distributor is driven by the oil pump shaft.
Oil pump repair
Two gears in mesh and having the same size create pressure in the pump and transfer it from the inlet side to the discharge side. To maintain the correct pressure, the gears must of course not be worn beyond the allowable wear limit. Before you simply install a new oil pump, you need to check the internal parts of the pump.
Remove the two short screws from the pump cover.
Remove the cover together with the oil suction tube.
Pull out the drive shaft and gear "weak" gear from the housing.
Remove both strainer bolts from the pump cover and remove the O-ring in the middle of the tube. Thoroughly clean all parts before testing.
Check the oil pump housing for bending. When the bearing points are worn, pressure losses occur, so it may be necessary to replace the housing.
Check the gears for wear by inserting a feeler gauge between the teeth to measure the backlash. It should be 0.05-0.2 mm (wear limit - 0.2 mm). If it is greater than this value, then the gears need to be replaced. In this case. the pump may need to be replaced completely.
The axial play of the gears should be within 0.06-0.15 mm (wear limit - 0.15 mm). To measure the backlash, place a steel angle or steel ruler on the upper plane of the pump housing and check the gap between the ruler and the gear plane with a steel flat feeler gauge.
Check the tightness of the driven gear shaft in the pump housing. If necessary, reinforce the shaft again by riveting the end of the shaft again with a core. If this fails, replace the pump housing.
Always replace gears in pairs if there are signs of wear or damage to the teeth. Most of the wear is noticeable in the cut areas.
When assembling the oil pump, make sure that the surfaces between both parts of the housing are clean. Lubricate all parts before assembly with oil. Especially make sure that the gears are lubricated with oil, because. they can be damaged during the first start-up and operation "dry". Check that the gears rotate without binding or obstruction before installing the pump.
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