Note: Use a new front crankshaft oil seal during assembly.
Disassembly
1. After removing the oil pump as described in Chapter 30, then proceed as follows.
2. Remove the mounting screws and take out the back cover (see illustration).
Inspection
3. Check the gap between the teeth of the inner and outer gears with a feeler gauge (see illustration).
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4. Check the clearance between the gears with the casing (side clearance), using the edge of a ruler and a feeler gauge (see illustration).
5. If any of the gaps are outside those specified in Specifications limits, replace worn components.
6. Check before assembly that the gears and the inside of the pump body are absolutely clean, note that the outer gear has a mark (dot) on the side that should face outward.
7. The oil pressure reducing valve components can be removed from the pump by unscrewing the cover (see illustration). Check the condition of the spring and plunger, replace if necessary.
Assembly
8. Clean all components thoroughly before installation.
9. Always replace the front crankshaft oil seal on the front side of the oil pump housing. Remove the old seal with a screwdriver and install the new one using a socket or tube (see illustrations).
10. Check that the mating surfaces of the rear cover and pump housing are clean, then coat the mating surface of the pump housing with sealant (Opel #90485251, or equivalent) and install the rear cover. Install and tighten the mounting screws.
11. Install the pump as described in Chapter 30.
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