Oil Pump: Service and Repair

Fig. 28 Oil pump removal 1985-87 Gear Type:

Fig. 29 Oil pump removal 1988 Rotary Type (Trochoid):

REMOVAL

1. Refer to ``Timing Belt, Replace'' procedure to remove timing belt.
2. Refer to ``Oil Pan, Replace'' procedure to remove oil pan.
3. Remove crankshaft timing belt sprocket.
4. Remove alternator mounting bracket.
5. Remove A/C compressor mounting bracket, if so equipped.
6. Remove alternator adjusting bolt and upper cover bolt.
7. Remove oil pump bolts and pump, Fig. 28 and 29.

Fig. 30 Checking oil pump gear radial clearance. Rotory type similar:

INSPECTION

1. Remove dipstick tube from oil pump.
2. Remove gear plate screws and gear plate.
3. Remove outer and inner gears and/or rotors.
4. Inspect oil seal lip for damage and replace as necessary.
5. Inspect outer and inner gears and/or rotors, gear plate, and oil pump case for excessive wear or damage.
6. Using feeler gauge, check radial clearance between outer gear and/or rotor and crescent, Fig. 30. If clearance exceeds .0122 inch, replace outer gear and/or rotor.

Fig. 31 Checking oil pump gear side clearance. Rotory type similar:

7. Using straightedge and feeler gauge, measure side clearance which should not exceed .0059 inch, Fig. 31.
8. Wash, clean and dry all oil pump parts.
9. Apply light coat of engine oil to inner and outer gears and/or rotors, oil seal lip portion, and inside surfaces of oil pump case and plate.
10. Install outer and inner gears and/or rotors in pump case.
11. Install gear plate and tighten screws securely. Check that gears turn smoothly by hand.
12. Install O-ring in pump case, then dipstick tube.

Fig. 32 Tool J-34853 installation:

Fig. 33 Oil pump bolt location:

ASSEMBLY

1. Install oil pump pins and gasket on engine block.
2. Install tool J-34853 (oil seal guide) onto crankshaft to prevent damage to oil seal lip, Fig. 32. Apply engine oil to special tool.
3. Install oil pump onto crankshaft and engine block. Note location of mounting bolts, Fig. 33. No. 1 bolts are shorter then No. 2 bolts in length. Install bolts as shown in Fig. 33, and torque bolts to 7-9 ft. lbs.

4. After installing oil pump, check that oil seal lip is not twisted, then remove tool.

Fig. 34 Rubber seal installation:

5. Install rubber seal between oil pump and water pump, Fig. 34.
6. If necessary, trim edges of oil pump seal flush with oil pan mating surface.
7. Install timing belt guide, key and crankshaft timing sprocket. Note that timing belt guide must be installed so that curved side faces oil pump.
8. Torque crankshaft timing sprocket bolt to 47-54 ft. lbs.
9. Install timing belt and tensioner components.
10. Adjust intake and exhaust valves.
11. Adjust water pump tension.
12. Fill crankcase.
13. Connect battery ground cable.
14. Run engine to check that oil pressure is correct.