Important: Do not raise the engine block by the crankshaft balancer to perform this service procedure. Damage to the crankshaft balancer or the crankshaft may occur.

1. Disconnect both the battery negative cables from the batteries. Refer to Battery Cable in Engine Electrical.
2. Remove the oil level indicator and tube from the engine. Refer to Oil Level Indicator and Tube Replacement .
3. Raise the vehicle.
4. Support the vehicle with safety stands.
5. Drain the engine oil.
6. Remove the transmission (2 wheel drive models only) from the vehicle.

•	For the 4L 80-E automatic transmission removal, refer to Transmission Replacement in Transmission/Transaxle.

•	For the NV 4500 manual transmission removal, refer to Transmission Replacement in Transmission/Transaxle.

7. Remove the clutch assembly (if equipped). Refer to Clutch Assembly Replacement in Clutch.
8. Remove the front propeller shaft (4 wheel drive models only). Refer to Front Propeller Shaft Replacement in Driveline/Axle.
9. Remove the front differential carrier from the vehicle. Refer to Differential Carrier Assembly Replacement in Front Axle.
10. Remove the flywheel from the crankshaft. Refer to Engine Flywheel Replacement .
11. Remove the oil pan bolts from the oil pan.
12. Using a block of wood and a hammer, tap the side of the oil pan until seal is broken.
13. Remove the oil pan from the engine block.



14. Remove the rear seal on the from the oil pan.
15. Clean the old RTV sealant from the oil pan and engine block.
16. Clean all the oil and grease from the sealing surfaces.

1. Apply a 2 mm (1/16 inch) bead of RTV sealant GM P/N 12345739 to the oil pan rear seal at the inside corners where the seal meets the rear crankshaft bearing cap on the engine block.
2. Install the oil pan rear seal to the rear crankshaft bearing cap before the sealer starts to dry.



3. Install the oil pan to the engine block.

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 oil pan bolts to the engine block.

Tighten

1. Tighten the bolts in the following order:
2. Tighten the two rear bolts to 17 N·m (23 lb ft).
3. Tighten all the other bolts to 10 N·m (89 lb in).
5. Install the flywheel to the crankshaft. Refer to Engine Flywheel Replacement .
6. Install the clutch assembly (if equipped). Refer to Clutch Assembly Replacement in Clutch.
7. Install the transmission (2 wheel drive models only) to the vehicle.

•	For the 4L 80-E automatic transmission, refer to Transmission Replacement in Transmission/Transaxle.

•	For the N 4500 manual transmission, refer to Transmission Replacement in Transmission/Transaxle.

8. Install the front differential carrier in the vehicle (4 wheel drive models only). Refer to Differential Carrier Assembly Replacement in Front Axle.
9. Install the front propeller shaft (4 wheel drive models only). Refer to Front Propeller Shaft Replacement in Driveline/Axle.
10. Lower the vehicle.
11. Install the oil level indictor and tube to the engine block. Refer to Oil Level Indicator and Tube Replacement .
12. Fill the crankcase with engine oil.
13. Connect both the battery negative cables to the batteries. Refer to Battery Cable in Engine Electrical.