For 1990-2009 cars

1. Install the drain plug in the water pump.
2. Apply GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the plug before installation.

Notice: Refer to Fastener Notice in the Preface section.

3. Install the coolant jacket plugs.

Tighten
Tighten the coolant jacket plug to 35 N·m (26 lb ft).

4. Install the rear oil passage plugs.
5. Apply GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the plugs before installation.

Tighten
Tighten the oil passage plug to 60 N·m (44 lb ft).

6. Install the other oil passage plugs.
7. Apply GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the plug before installation.

Tighten
Tighten the oil passage plugs to 35 N·m (26 lb ft).

8. Lubricate the crankshaft position (CKP) sensor O-ring with clean engine oil.
9. Install the CKP sensor and bolt.

Tighten
Tighten the CKP sensor bolt to 10 N·m (89 lb in).

10. Install the oil pressure switch.

Tighten
Tighten the oil pressure switch to 26 N·m (19 lb ft).

11. Install the knock sensors and bolts.

Tighten
Tighten the knock sensor bolts to 25 N·m (18 lb ft).

12. Install the piston oil nozzle assemblies.
13. Install the piston oil nozzle assembly bolts.

Tighten
Tighten the piston oil nozzle assembly bolts to 15 N·m (11 lb ft).