75. Oil Pump Installation

Oil Pump Installation

Tools Required
- J 35268-A Camshaft/Front Main Seal Installer
- J 36660-A Torque Angle Meter
- J 42065 Crank Hub Holding Tool
- J 42098 Crank Hub TORCH Socket







Important: Do not cover and/or restrict the gasket openings and oil passages with sealant. Only apply sealant to the crosshatched area of the gasket as shown in the illustration.

1. Coat only the pump side of the new oil pump gasket with a thin, even coating of GM P/N 1052942 (Canadian P/N 10953466) or equivalent.
2. Install the oil pump gasket.







3. Install the oil pump and align with the guide pins (2).
4. Coat the oil pump bolts with GM P/N 12345382, (Canadian P/N 10953489) or equivalent.

Notice: Refer to Fastener Notice in Service Precautions.
Fastener Notice







5. Install the oil pump bolts.
- Tighten in the sequence shown.
- Tighten the oil pump bolts to 12 Nm (9 ft. lbs.).







6. Install the oil pressure sender.
Tighten the oil pressure sender to 35 Nm (26 ft. lbs.).







7. Install the oil pump collar.
8. Coat the lip of the front main oil seal with a small amount of clean engine oil, to aid in installation.
9. Install the front main oil seal.
10. Use the J 35258-A to tap the front main oil seal into place. Ensure the front main oil seal if fully and evenly seated.
11. Install the crankshaft drive gear.

12. Install a new crankshaft drive gear bolt.
Tighten Use the J 42098 to tighten the crankshaft drive gear bolt, while counterholding the crankshaft drive gear with the J 42065 to 250 Nm (184 ft. lbs.).

13. Use the J 36660-A to tighten the crankshaft drive gear bolt in the following sequence:
13.1. The first pass rotate the crankshaft drive gear bolt 45 degrees.
13.2. The second and the final pass rotate the crankshaft drive gear bolt an additional 1 5 degrees.

Important: The oil pump bolts must be re-tightened AFTER the generator mounting bolt has been tightened to specifications to allow for uniform compression of the oil pump gasket.







14. Temporarily mount the generator and install the generator lower mounting bolt (3).
Tighten the generator lower mounting bolt (3) to 35 Nm (26 ft. lbs.).

Oil Pump Bolt Torque Sequence:

15. Re-tighten the oil pump bolts.
- Tighten in the sequence shown.
- Tighten the oil pump bolts to 20 Nm (15 ft. lbs.).

16. Remove the generator bolt and the generator.