For 1990-2009 cars

### First Design

1. Coat the pump side (the crosshatched area shown in the illustration) of the new oil pump gasket with a thin, even coating of anaerobic sealant GM P/N 1052942 or equivalent.

Important: Do not cover and/or restrict the gasket openings with excess sealant.

2. Install the oil pump gasket. (Note the tightening sequence)
3. Install the oil pump and align with the guide pins (2).
4. Apply thread sealant GM P/N 12346004, or equivalent, to the six oil pump bolts and install the bolts.

Tighten
Tighten the oil pump bolts, using the sequence shown, to 8 N·m (71 lb in).

5. Install the timing belt idler pulley and washer for camshafts 3 and 4.

Important: The timing belt and the generator are NOT reinstalled at this point, the bolts are torqued to specification to allow for proper compression of the oil pump gasket.

Tighten
Tighten the timing belt idler pulley locking nut to 40 N·m (30 lb ft).

6. Install the generator the generator upper and lower mounting bolts.

Tighten

• | Tighten the generator lower and upper bolts to 40 N·m (30 lb ft).

• | Re-tighten the six oil pump bolts, using the sequence shown, to 9 N·m (80 lb in).

7. Remove the timing belt idler pulley and washer for camshafts 3 and 4.
8. Remove the generator upper (6) and lower (3) mounting bolts.
9. Remove the generator.
10. Install the oil pump collar.
11. Install the front main oil seal. Coat the lip of the front main oil seal with a small amount of GM P/N 1052497 chassis grease or equivalent to aid in installation.
12. Use the J 35268-A to tap the front main oil seal into place.
13. Ensure the front main oil seal if fully and evenly seated.
14. Install the crankshaft drive gear.
15. Install a new crankshaft drive gear bolt.

Tighten
Tighten the crankshaft drive gear bolt to bolt to 250 N·m (184 lb ft) + 45 degrees + 15 degrees.

### Second Design

#### Second Design Oil Pump and Rear Timing Belt Cover Information

Starting with engine unit number 08191279, a second design oil pump housing and rear timing belt cover were introduced into MY97 Catera production. The second design rear timing belt cover features an additional hole that allows access to one of the oil pump bolts located behind the cover. Since it is necessary to re-torque all of the oil pump bolts after the timing belt idler pulley installation, the access hole was added to the cover to make the re-torque procedure easier. The second design oil pump has an extended boss to shield the access hole in the rear timing belt cover from road and other debris. Both first and second design pumps use the same gaskets. Second design pumps can be installed on first design engines, however, it requires the use of the second design rear timing belt cover and a longer (M6 x 25 mm) oil pump bolt in the number six position.

1. Coat the pump side (the crosshatched area shown in the illustration) of the new oil pump gasket with a thin, even coating of anaerobic sealant GM P/N 1052942 or equivalent.

Important: Do not cover and/or restrict the gasket openings with excess sealant.

2. Install the oil pump gasket (Note the tightening sequence).
3. Install the oil pump and align with the guide pins (2).
4. Apply thread sealant GM P/N 12346004, or equivalent, to the six oil pump bolts and install the bolts.

Tighten
Tighten the oil pump bolts, using the sequence shown, to 8 N·m (71 lb in).

5. Install the oil pump collar.
6. Install the front main oil seal. Coat the lip of the front main oil seal with a small amount of GM P/N 1052497 chassis grease or equivalent to aid in installation.
7. Use the J 35268-A to tap the front main oil seal into place.
8. Ensure the front main oil seal if fully and evenly seated.
9. Install the crankshaft drive gear.
10. Install a new crankshaft drive gear bolt.

Tighten
Tighten the crankshaft drive gear bolt to bolt to 250 N·m (184 lb ft) + 45 degrees + 15 degrees.