For 1990-2009 cars

1. Clean the sealing surfaces on the front cover, the crankcase, the cylinder block and the cylinder heads.
2. Apply GM P/N 12346240 or equivalent to the front cover at the points indicated (1).
3. Apply engine oil to the oil seal lip (3) and the water pump O-ring (2).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the front cover (1) and secure with the bolts.

Tighten
Tighten the bolts to 11 N·m (7.5 lb ft).

5. Apply engine oil to the O-ring of the crankshaft position (CKP) sensor.
6. Install the crankshaft position (CKP) sensor. Secure with the bolt.

Tighten
Tighten the bolt to 6 N·m (4.5 lb ft).

7. Install the upper oil pan. Refer to Upper Oil Pan Installation .
8. Install the lower oil pan. Refer to Lower Oil Pan Installation .
9. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement .
10. Install the power steering pump bracket. Secure with the 3 bolts.

Tighten
Tighten the bolts to 45 N·m (32.5 lb ft).

11. Install the thermostat cap. Refer to
12. Install the water pump pulley.
13. Install the left and right cylinder head covers. Refer to Camshaft Cover Replacement - Left Side and Camshaft Cover Replacement - Right Side .
14. Install the intake manifold and throttle body. Refer to Intake Manifold Replacement .