Oil Pan: Service and Repair
REMOVAL PROCEDUREIMPORTANT: 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 Powertrain Management.
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 4L80-E automatic transmission removal, refer to Transmission Replacement in Transmission and Drivetrain.
^ For the NV 4500 manual transmission removal, refer to Transmission Replacement in Transmission and Drivetrain.
7. Remove the clutch assembly (if equipped). Refer to Clutch Assembly Replacement in Transmission and Drivetrain.
8. Remove the front propeller shaft (4 wheel drive models only).
^ For vehicles equipped with the non active transfer case, refer to Propeller Shaft Replacement (Front Axle - All Except NP8) in Transmission and Drivetrain.
^ For vehicles equipped with the active transfer case, refer to Propeller Shaft Replacement (Front Axle - NP8) in Transmission and Drivetrain.
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.
INSTALLATION PROCEDURE
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: Refer to Fastener Notice in Service Precautions.
4. Install the oil pan bolts to the engine block.
4.1. Tighten the bolts in the following order:
4.2. Tighten the two rear bolts to 17 Nm (23 ft. lbs.).
4.3. Tighten all the other bolts to 10 Nm (89 inch lbs.).
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 Transmission and Drivetrain.
7. Install the transmission (2 wheel drive models only) to the vehicle.
^ For the 4L80-E automatic transmission, refer to Transmission Replacement in Transmission and Drivetrain.
^ For the N 4500 manual transmission, refer to Transmission Replacement in Transmission and Drivetrain.
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).
^ For vehicles equipped with the non active transfer case, refer to Propeller Shaft Replacement (Front Axle - All Except NP8) in Transmission and Drivetrain.
^ For vehicles equipped with the active transfer case, refer to Propeller Shaft Replacement (Front Axle - NP8) in Transmission and Drivetrain.
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 Powertrain Management.