Inspection

INSPECTION

Check condition of the seal rings and thrust washer. The seal rings do not need to be replaced unless cracked, broken, or severely worn.


Inspect the pump and support components. Replace the pump or support if the seal ring grooves or machined surfaces are worn, scored, pitted, or damaged. Replace the pump gears if pitted, worn chipped, or damaged.


Inspect the valves and plugs for scratches, burrs, nicks, or scores. Minor surface scratches on steel valves and plugs can be removed with crocus cloth but do not round off the edges of the valve or plug lands. Maintaining sharpness of these edges is vitally important. The edges prevent foreign matter from lodging between the valves and plugs and the bore.


Inspect all the valve and plug bores in the oil pump cover. Use a penlight to view the bore interiors. Replace the oil pump if any bores are distorted or scored. Inspect all of the valve springs. The springs must be free of distortion, warped or broken coils.


Trial fit each valve and plug in its bore to check freedom of operation. When clean and dry, the valves and plugs should drop freely into the bores.


SIDE CLEARANCE





OIL PUMP SIDE CLEARANCE


Check the side clearance with Plastigage(R). Measure the clearance at more than three arbitrary points (1).The minimum dimension of these measurements should be the clearance, if the difference between the maximum and minimum clearance is greater than 0.02-0.055 mm (0.0008-0.002 in.), the part is considered defective or worn and should be replaced.