Oil Pump
CLEANINGClean pump and support components with solvent and dry them with compressed air.
INSPECTION
1. Check condition of the seal rings and thrust washer on the reaction shaft support. The seal rings do not need to be replaced unless cracked, broken, or severely worn.
2. Visually inspect the pump and support components. Replace the pump assembly if the seal ring grooves or machined surfaces are worn, scored, pitted, or damaged. Replace the pump assembly if the gears if pitted, worn chipped, or damaged.
3. Inspect the pump bushing. Then check the reaction shaft support bushing. Replace the pump assembly if either bushing is heavily worn, scored or damaged.
4. Clearance between outer gear and reaction shaft housing should be 0.010 to 0.063 mm (0.0004 to 0.0025 inch). Clearance between inner gear and reaction shaft housing should be 0.010 to 0.063 mm (0.0004 to 0.0025 inch). Both clearances can be measured at the same time by installing the gears in the pump body and measure pump component clearances as follows:
5. Reinstall gears to pump body and measure outer gear-to-pocket clearance with a feeler gauge (Fig. 184). Outer gear-to-pocket clearance should be within 0.046 - 0.141 mm (0.0018 - 0.0056 inch).
6. Measure both inner and outer gear side clearance with Plastigage(TM). If Plastigage(TM) is not available, measure across the pump body with a straight edge and feeler gauge.
a. Position an appropriate piece of Plastigage(TM) across both gears.
b. Align the plastigage to a flat area on the reaction shaft housing.
c. Install the reaction shaft support to the pump housing and torque to 28 Nm (250 inch lbs.).
d. Separate the reaction shaft housing from the pump housing and measure the Plastigage (TM) following the instructions supplied with it. Inner and outer gear side clearance should be within 0.020 - 0.046 mm (0.0008 - 0.0018 inch).