For 1990-2009 cars

Note: All gasket surfaces should be free of oil or other foreign material during assembly.

1. Lubricate the O-ring seals with clean engine oil.
2. Install the O-ring seals (537) to the cover (555).

Caution: Refer to Fastener Caution in the Preface section.

3. Install the cover (555), gasket (556), and bolts (506). Tighten the manifold bolts to 25 N·m (18 lb ft).
4. Apply sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the sensor.
5. Install the oil pressure sensor (706) and sealing washer (707). Tighten the sensor to 35 N·m (26 lb ft).