Oil Pump: Service and Repair

REMOVAL
1. Remove oil pan, refer to ``Oil Pan, Replace'' procedure.
2. Remove pump to rear main bearing attaching bolt, then the pump and extension shaft.

Fig. 11 Oil pump assembly:

DISASSEMBLY
1. Remove pump cover attaching bolts (7), Fig. 11, and pump cover (3). Mark gear teeth to ensure correct position during assembly.
2. Remove idler gear and drive gear (2), then the shaft from pump body (1).
3. Remove pressure regulator valve retaining pin (6), pressure regulator spring (5) and valve (4).
4. If pickup screen and pipe assembly need to be replaced, mount pump in a suitable vise, then remove pipe from pump cover. Do not remove pickup screen from pipe, this is serviced as an assembly.




CLEANING & INSPECTION
1. Wash all parts in suitable cleaning solvent, then dry with compressed air.
2. Inspect pump body and cover for cracks or excessive wear.
3. Inspect pump gears for damage or excessive wear. Pump gears and body are not serviced separately. If pump gears are defective, replace entire oil pump assembly.
4. Check drive gear shaft for looseness in the pump body.
5. Inspect inside of pump cover for wear that would permit oil to leak past ends of gears.
6. Inspect pickup screen and pipe assembly for looseness or damage.
7. Check pressure regulator valve for damage and proper fit.

ASSEMBLY
1. If pickup screen and pipe assembly was removed, it should be replaced with a new part. Mount pump in suitable vise and apply suitable sealer to outside diameter of swagged end of pipe, then tap pipe in place using a suitable tool. Loss of press fit condition could result in an air leak and loss of oil pressure. Also use caution not to twist, shear or collapse pipe during installation.
2. Install pressure regulator valve assembly.
3. Install drive gear and shaft in pump body.
4. Align idler gear installation marks, then install gear in pump body.
5. Install cover gasket, then the pump cover and attaching bolts.
6. Turn drive shaft by hand to ensure smooth operation.

INSTALLATION
1. Install pump and extension shaft with retainer to rear main bearing cap, aligning top end of hexagon extension shaft with hexagon socket of distributor drive gear.
2. Install pump to rear bearing cap bolt and tighten securely.
3. Install oil pan, refer to ``Oil Pan, Replace'' procedure.