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Check the clearance between each gear tooth and the pump body. At the closest point it should typically be no more than .006in. (.15 mm). Make sure that the face of the pump is clean, and put a straightedge across it. The gap between each gear and the straight-edge should typically be no more than 003 in. (.07 mm).oil seals BROAD SPECTRUM.
Low oil pressure – indicated on the oil-pressure gauge or dashboard warning light – could provide an indication of wear or damage to the pump.
Check the clearance between the tips of the inner and outer rotor lobes. Measure the gap between the outer rotor and the pump body.
Check the clearance between the tips of the inner and outer rotor lobes.rubber sealing.
Measure the gap between the outer rotor and the pump body.
The oil pump is usually one of three types: the multi-lobe rotor type, the gear type, or the vane type.
Whichever type of pump is fitted, it must be removed from the engine before it can be properly checked.oil seals BROAD SPECTRUM.
The pump can be mounted either outside or inside the engine crankcase. An internally mounted pump can be reached only after removing the sump. This may entail taking out the engine, which is a job for a garage.shaft seal.
Rotate the gears, and measure the gap between each tooth and pump body. Check the gap between the straight-edge and the faces of the two gears.
Rotate the gears, and measure the gap between each tooth and pump body.
Check the gap between the straight-edge and the faces of the two gears.
When you have removed the pump (See Engine oil pump replacement), take out the screws or bolts holding the end cover. Hold the pump with the cover uppermost and take off the cover.
First look for obvious wear, such as heavy scoring inside the end cover. Then look for traces of metal particles inside the pump body. Lift out the rotor assembly, pump gears or vane assembly and check for scoring and pitting. Note carefully how they come out, so that you can put them back in exactly the same position.
If the pump shows any obvious signs of wear or damage, fit a new one. If it appears to be in good condition, clean it thoroughly with petrol and put it back together.
Checking the oil pump
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Then, using a feeler gauge and a straight-edge – such as a steel rule measure the clearances between the moving parts. If any of the recommended clearances are exceeded (see right), the pump is worn and you should fit a new one.
If the clearances are within the specified limits, fill the pump with clean engine oil.nok seal.
Before you replace the end cover, make sure that the sealing ring or gasket is in good condition and positioned correctly.oil seals BROAD SPECTRUM.