Oil Pump: Service and Repair

Fig. 18 Oil Pump Exploded View:

REMOVAL
1. Remove oil pan as described under OIL PAN.
2. Remove oil pump-to-main bearing cap attaching bolt.
3. Remove oil pump.

DISASSEMBLY
1. Remove pump cover attaching bolts and pump cover, Fig. 18.
2. Mark drive and idler gear teeth so they can be installed in same position, then remove drive and idler gears and shaft from pump body.
3. Remove pin, spring and pressure regulator valve from pump cover.
4. If pickup tube and screen are to be replaced, mount pump cover in soft jawed vise and remove pickup tube from cover. Do not remove screen from pickup tube, as these components are serviced as an assembly.

INSPECTION
1. Inspect pump body and cover for excessive wear and cracks.
2. Inspect pump gears for damage or excessive wear. If pump gears are damaged or worn, the entire pump assembly must be replaced.
3. Check drive gear shaft for looseness in pump body.
4. Inspect pump cover for wear that would allow oil to leak past teeth.
5. Inspect pickup tube and screen for damage.
6. Check pressure regulator valve for fit in pump cover.

ASSEMBLY
1. If pickup tube and screen were removed, apply sealer to end of pickup tube, then mount pump cover in a soft jawed vise and using pickup screen and tube installer tool No. J-21882, tap pickup tube into place with a hammer. Whenever the pickup tube and screen have been removed, a new pickup tube and screen assembly should be installed. Ensure tube does not twist, shear or collapse when installing pickup tube and screen. Loss of a press fit condition could result in an air leak and loss of oil pressure.
2. Install pressure regulator valve, spring and pin, Fig. 18.
3. Install drive gear and shaft in body.
4. Align marks made during disassembly, then install idler gear.
5. Install pump cover gasket, cover and attaching bolts. Torque bolts to specification.
6. Rotate pump driveshaft by hand and ensure smooth operation.

INSTALLATION
1. Align oil pump shaft with oil pump driveshaft.
2. Install oil pump attaching bolts and torque to specification.
3. Install oil pan.