Unscrew the bolts securing the pump housing cover and remove it with the oil intake and filter mesh. If necessary, remove the oil pickup by unscrewing the two bolts. There is an O-ring at the end of the oil pickup which must be replaced.
Remove the drive gear and driven gear from the pump housing.
Thoroughly clean all parts and inspect them carefully.
Check if the pump housing is damaged, if worn, replace it.
Check the degree of wear of the gears, for this purpose, insert a feeler gauge between the teeth (pic. 225) and measure the backlash in the meshing of the gears. It should be 0.05-0.20 mm.
If the gap exceeds the maximum allowable, replace the gears or the pump assembly. Attach a square to the mating plane of the pump housing and measure the gap between the ruler and the ends of the gears (pic. 226) - axial play of the gears should be 0.05-0.15 mm.
Check the condition of the gear shaft bore in the pump cover.
Gears are always replaced only as a set if the teeth show signs of wear or mechanical damage. Note that the pump gears in a turbocharged engine are larger in diameter than the pump gears in naturally aspirated engines and are therefore not interchangeable.
The wear of gears is indicated, for example, by the presence of polished areas on the surfaces of the teeth.
Before replacing the pump, remember to clean the mating surface on the cylinder block and pump cover. All components must be lubricated before installation in order to avoid dry friction of unlubricated parts during the first engine revolutions. Before you install the pump in the engine, you need to make sure that the gears rotate easily.
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