Disassembly/Assembly

Fig. 14 Exploded View Of Oil Pump:

DISASSEMBLE
1. Drain oil from pump.
2. Remove pump cover and pump gears, Fig.14.
3. Remove pressure regulator valve. If valve is stuck, soak pump housing in carburetor cleaning solvent. Pressure regulator valve spring may be under pressure. Remain retaining pin carefully.
4. Clean sludge, oil and/or varnish from all parts. Varnish may be removed by soaking in carburetor or cleaning solvent.

INSPECTION
1. Inspect pump housing and cover for cracks or damaged threads, replacing as necessary. Do not attempt to repair pump housing. Replace spring as necessary.
2. Inspect idler gear shaft. If loose in housing, replace pump.
3. Inspect pressure regulator valve for scoring or sticking. Burrs may be removed with a fine oil stone.
4. Inspect pressure regulator valve spring for loss of tension or bending.
5. Inspect suction pipe and screen assembly for looseness if permanently pressed into pump body. If pipe is loose or has been removed, pump body cover must be replaced. Check for broken wire mesh or screen.
6. Inspect gears for chipping, galling or wear.
7. Measure gear lash in several positions, Fig.15. Gear lash should be 0.0037-0.0077 inch.

Fig. 15 Oil Pump Gear Lash Measurement:

8. Measure pump housing gear pocket depth, Fig.16. Depth should be as follows:

Fig. 16 Oil Pump Gear Pocket Measurement:

a. On models with an aluminum pump body, pump depth should be 1.195-1.198 inches.
b. On models with a cast pump body, pump depth should be 1.202-1.204 inches.
9. Measure pump housing gear pocket diameter, Fig.16. Pump housing diameter should be 1.503-1.505 inches.

10. Measure pump gear diameters, Fig. 17. Gear diameter should be 1.498-1.500 inches.

Fig. 17 Oil Pump Gear Measurement:

11. Measure pump gear side clearance, Fig.18. Gear side clearance should be as follows:
a. On 1994-95 models, side clearance should be 0.003-0.004 inch.

Fig. 18 Gear Side Clearance Measurement:

12. Measure oil pump end clearance, Fig.19, as follows:

Fig. 19 Oil Pump End Clearance Measurement:

a. On models with an aluminum pump body, end clearance should be 0.0016-0.0067 inch.
b. On models with a cast pump body, end clearance should be 0.0020-0.0050 inch.

ASSEMBLE
1. Lubricate all internal parts with engine oil.
2. Install pump gears.
3. Prime engine oil galleries by removing engine oil pump drive unit and rotating oil pump, using drill motor, appropriate socket and extension.
4. Install cover and gasket. Use only original equipment gaskets as gasket thickness is critical to proper pump operation.
5. Install pin. Ensure pin is properly secured.
6. Torque pump cover attaching bolts to 89 inch. lbs.