Oil Pump: Service and Repair

REMOVAL

1. Remove timing case as outlined under ``Timing Case, Replace'' procedure.
2. Remove oil pump cover.
3. Remove inner and outer gears from case, noting location of mating marks to aid in installation.
4. Remove plug, spring and relief valve from case.

Fig. 26 Checking Outer Gear To Case Clearance:

INSPECTION

1. Check gear teeth and timing case for excessive wear or damage.
2. Check clearance between outer gear circumference and timing case as shown in Fig. 11. Clearance should be .0039-.0079 inch.

Fig. 27 Checking Outer Gear Tooth To Crescent Clearance:

3. Check clearance between outer gear tooth and crescent as shown in Fig. 12. Clearance should be .0087-.0134 inch.

Fig. 27 Checking Outer Gear Tooth To Crescent Clearance:

4. Check clearance between inner gear tooth and crescent as shown in Fig. 13. Clearance should be .0083-.0126 inch.
5. Check endplay of inner and outer gears. Endplay should be .0016-.0039 inch.
6. If damage or values other than those specified are noted, replace parts as necessary.

INSTALLATION

1. Install inner and outer gears into timing case, ensuring mating marks are properly aligned.
2. Install oil pump cover and torque retaining bolts to 7 ft. lbs.
3. Install relief valve, spring and plug. Torque plug to 33 ft. lbs. on 1986-87 models and 25 ft. lbs. on 1988 models.
4. Install timing case.