Rotor Clearance

1. Using a straightedge and feeler gauge, make sure inside of cover is flat. If a 0.038 mm (0.0015 inch) feeler gauge can go under straightedge, oil pump should be replaced.
2. Insert the inner and outer rotor into the housing.
3. Place a straightedge over the rotor assembly and the housing.

Fig. 38 Oil pump rotor endplay inspection:

4. Measure the clearance between the straightedge and the inner rotor, then the outer rotor. Clearance must not exceed 0.10 mm (0.004 inch).
5. If clearance is excessive, replace oil pump.