Inspection

CLEANING
Wash all parts in a suitable solvent and inspect carefully for damage or wear.

INSPECTION
Mating surface of the oil pump cover should be smooth. Replace pump cover if scratched or grooved.

Checking Oil Pump Cover Flatness:

Lay a straightedge across the pump cover surface. If a 0.076 mm (0.003 inch) feeler gauge can be inserted between cover and straightedge, cover should be replaced.

Measuring Outer Rotor Thickness:

Measuring Inner Rotor Thickness:

Measure thickness and diameter of rotors. If either rotor thickness measures 14.956 mm (0.5876 inch) or less, or if the diameter is 82.45 mm (3.246 inches) or less, replace rotor set.

Measuring Outer Rotor Clearance In Cover:

Slide outer rotor into timing chain cover pump body. Press rotor to the side with your fingers and measure clearance between rotor and pump body. If clearance is 0.19 mm (0.007 inch) or more, and outer rotor is within specifications, replace timing chain cover.

Measuring Inner Rotor Clearance In Cover:

Install inner rotor into timing chain cover pump body. Inner rotor should be positioned with chamfer up or toward engine when cover is installed. This allows easy installation over crankshaft. If clearance between inner and outer rotors is 0.150 mm (0.006 inch) or more, replace both rotors.

Measuring Clearance Over Rotors:

Place a straightedge across the face of the timing chain cover pump body, between bolt holes. If a feeler gauge of 0.077 mm (0.003 inch) or more can be inserted between rotors and the straightedge, and the rotors are within specifications, replace timing chain cover.

Inspect oil pressure relief valve plunger for scoring and free operation in its bore. Small marks may be removed with 400-grit wet or dry sandpaper.

The relief valve spring has a free length of approximately 49.5 mm (1.95 inches). The spring should test between 100 and 109 N (22.5 and 24.5 pounds) when compressed to 34 mm (1-11/32 inches). Replace spring that fails to meet these specifications.

If oil pressure was low and pump is within specifications, inspect for worn engine bearings or other reasons for oil pressure loss.