39. Oil Pump Clean and Inspect

Important: If the oil pump is found to be damaged or excessively worn replace the oil pump as an assembly.

1. Inspect the following for excessive wear or damage:
^ The oil pump outer gear
^ The oil pump inner gear
^ The oil pump cover
^ The oil pump body





2. Measure the radial clearance between the oil pump outer gear and the oil pump body using a feeler gauge. Replace the oil pump if the clearance exceeds 0.15 mm (0.0059 inch).





3. Measure the side clearance between the oil pump gears and a straightedge using a feeler gauge.
Replace the oil pump if the clearance exceeds 0.11 mm (0.0043 inch).





4. Measure the free length of the oil pressure relief spring.
Replace the spring if the free length is less than 63.5 mm (2.5 inch).





5. Measure the oil pressure relief spring tension.
Replace the spring if the tension is less than 86.0 Newtons at 52 mm (62 lb. at 2.05 inch).