Oil Pump: Service and Repair

REMOVAL & INSTALLATION
1. Remove oil pan as described under OIL PAN.
2. Remove pump to rear main bearing cap bolt, then the pump and extension shaft.
3. Reverse procedure to install. Ensure bottom edge of oil pump screen is parallel to bottom edge of oil pan rails. Tighten oil pump to rear main bearing cap bolt to specifications.

DISASSEMBLY, INSPECTION & ASSEMBLY
1. Remove oil pump as described under OIL PAN.
2. Remove pump cover screws and pump cover.
3. Mark gear teeth so they can be reassembled with same teeth indexing, then remove drive gear, idler gear and shaft.
4. Remove pressure regulator valve retaining pin, pressure regulator valve and related parts.
5. If pickup screen and pipe require replacement, mount pump in a soft-jawed vise and extract pipe from pump. On 1991-92 7.4L/V8-454 engine, the pickup pipe and screen are not serviceable, the oil pump assembly must be replaced if the pickup pipe or screen need replacement.
6. Wash all parts in cleaning solvent and dry with compressed air.
7. Inspect pump body and cover for cracks and excessive wear.
8. Inspect pump gears for damage or excessive wear.
9. Check drive gear shaft for looseness in pump body.
10. Inspect inside of pump cover for wear that would allow oil to leak past the ends of the gears.
11. Inspect pickup screen and pipe assembly for damage to screen, pipe or relief grommet.
12. Check pressure regulator valve for proper fit in pump housing.
13. Reverse procedure to assemble. Turn driveshaft by hand to check for smooth operation. The pump gears and body are not serviced separately. If the pump gears or body are damaged or worn, the pump assembly should be replaced. Also, if the pickup screen was removed, it should be replaced with a new one as loss of the press fit condition could result in an air leak and loss of oil pressure.