Oil Pump and Reaction Shaft Support

Clean pump and reaction shaft support components with solvent and dry them with compressed air.

Inspect the pump housing and support components. Replace the housing 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 thrust washer for wear or damage. Replace the washer if necessary.

Inspect the pump and reaction shaft support bushings. Minor bushing wear is acceptable. Replace the bushings only if scored, or severely worn.





Install the gears in the pump housing and measure end clearance with a feeler gauge and straightedge. The pump inner gear is a one way fit. The bore on one side of the gear inside diameter is chamfered. Be sure the chamfered side faces forward (to front of pump). Clearance should be 0.010 - 0.06 mm (0.0004 - 0.0025 inch).





Measure clearance between the outer gear and the pump body. Clearance should be 0.08 - 0.19 mm (0.0035 - 0.0075 inch).





Measure gear tooth clearance with a feeler gauge. Align one tooth of the outer gear in inner gear and measure clearance. Clearance should be 0.08 - 0.19 mm (0.0035 - 0.0075 inch).