Oil Pump: Service and Repair

REMOVAL

1. Remove oil pan as outlined.
2. Remove bolts securing pump to block and the oil pump and screen assembly.

Fig. 11 Oil pump exploded view:

DISASSEMBLY

1. Remove 4 cover retaining bolts and the cover, Fig. 11.
2. Mark position of drive gear and rotor to ensure proper assembly.
3. Remove drive gear and rotor from body.
4. Remove pin, spring and pressure regulator valve.Do not remove oil pump pickup and screen assembly. If pickup tube is loose, or if tube or screen are damaged or clogged, oil pump should be replaced.




INSPECTION

1. Inspect pump body for cracks, scoring and excessive wear.
2. Inspect gears for cracks, excessive wear and damage, and check shaft for looseness in housing.
3. Inspect inside of cover for wear and scoring that would allow oil to leak past ends of gears.
4. Check fit of relief valve in bore, checking for looseness or binding.
5. If any components are damaged or excessively worn, or if pickup assembly is loose or damaged, oil pump assembly should be replaced.

ASSEMBLY

1. Insert drive gear shaft through pump housing bore, align matching marks and install idler gear with smooth side toward cover.
2. Install cover and torque retaining screws to 105 inch lbs., then ensure pump shaft rotates freely.
3. Install regulator valve plunger and spring, compress spring and secure assembly with retaining pin.

INSTALLATION

1. Prime pump with engine oil or pack with petroleum jelly.
2. Align slot in pump shaft with tang on drive shaft.
3. Install pump on block, positioning flange over oil pump driveshaft lower bushing, and torque mounting bolts to 22 ft. lbs.
4. Reinstall oil pan as outlined.