Volkswagen Golf/Jetta 2 manual

Oil pump - examination and renovation
Engine repair procedures - 1.6 and 1.8 litre 8 valve / Oil pump - examination and renovation


1 With the oil pump on the bench, prise off the cap with a screwdriver and clean the strainer gauze in fuel. Refit the gauge and press on the cap.

2 Remove the two small bolts and take the cover away from the body. Examine the face of the cover (see illustration). As seen in the illustration, the gears have marked the cover.

If the depth of this marking is significant, then the face of the cover must be machined flat again.

25.2 Examine face of oil pump cover for scoring
25.2 Examine face of oil pump cover for scoring

3 Remove the gears and wash them with the body in clean paraffin. Dry and reassemble the gears, lubricating them with clean engine oil. Measure the backlash between the gears with a feeler blade (see illustration). This should be 0.05 to 0.20 mm.

25.3 Checking oil pump gear backlash
25.3 Checking oil pump gear backlash

4 Now place a straight-edge over the pump body along the line joining the centre of the two gears and measure with a feeler blade the axial clearance between the gears and the straight-edge (see illustration). This must not exceed 0.15 mm.

25.4 Checking oil pump gear endfloat
25.4 Checking oil pump gear endfloat

5 If all is well, check that the shaft is not slack in its bearings and reassemble the pump for fitting to the engine.

6 If there is any doubt about the pump, it is recommended that a replacement be obtained. Once wear starts in a pump it progresses rapidly. In view of the engine damage that may follow a loss of oil pressure, skimping the oil pump repair is a false economy.


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