Genuine 1995 Audi 90 Oil Pump

1995 Audi 90 Oil Pump Parts and Q&A

• Q: How to remove and reassemble the oil pump and its components for Five-cylinder engines on 1995 Audi 90?

  A: Remove the timing belt and crankshaft gear, followed by the sump and dipstick. Take out the two bolts securing the oil intake pipe stay to the crankcase, knock back the tabs of the lockplate on the intake pipe flange, and remove the bolts and intake pipe. Next, remove the bolts securing the oil pump, then take off the oil pump and gasket. Remove the countersunk screws securing the pump backplate and lift it off to expose the gears. Check for a mark on the exposed face of the gears; if absent, make a mark indicating which side faces the engine before removing them. Unscrew the pressure relief valve and take out the plug, sealing ring, spring, and plunger. Clean all parts thoroughly, examining the pump casing and backplate for wear or scoring, and check the pressure relief valve plunger and its seating for damage, ensuring the spring is undamaged. Inspect the gears for wear, noting that new gears must be fitted as a pair. Prise out the oil seal from the front of the pump, oil the lip of the new seal, insert it with the closed face outwards, and use a block of wood to tap it in flush. If there is scoring on the crankshaft where the seal lip bears, push the seal to the bottom of its recess to ensure it bears on an undamaged part. Reassemble the pump by fitting the gears and backplate, ensuring the inner gear's slotted end faces the crankshaft; the outer gear should be fitted the same way as before removal. If applicable, align the triangle mark on the gears towards the front. Refit the oil pump with a new gasket, ensuring the inner gear's slot engages the crankshaft dog. Insert and tighten the bolts in a diagonal sequence to the specified torque. Fit the oil intake pipe with a new gasket, tighten the bolts, and bend the lockplate tabs onto the flange bolts. Finally, refit the dipstick, sump, and timing belt along with the crankshaft gear.