Oil Pan: Service and Repair
REMOVAL PROCEDUREIMPORTANT: The original oil pan gasket is retained and aligned to the oil pan by rivets. When installing a new gasket, it is not necessary to install new rivets.
DO NOT reuse the oil pan gasket. When installing the oil pan, install a NEW oil pan gasket.
CAUTION: Refer to Battery Disconnect Caution in Service Precautions.
1. Disconnect the negative battery cable.
2. Remove the front differential if equipped with four wheel drive. Refer to Differential Carrier Assembly Replacement in Front Axle.
3. Remove the steering linkage shield, if equipped. Refer to Steering Linkage Shield Replacement in Steering.
4. Remove the oil pan underbody shield.
5. Remove the cross brace if equipped.
6. Drain the engine oil and remove the engine oil filter. Refer to Engine Oil and Oil Filter Change.
7. Remove the transmission to oil pan bolts.
8. Disconnect the oil level sensor electrical connector.
9. Remove two front wiring harness retainer bolts.
10. Remove the engine wiring harness retainer bolts from the engine oil pan.
11. Remove the engine oil cooler pipe to oil pan bolt.
12. Remove the transmission oil cooler pipe retainer and the bolt from the oil pan.
13. Remove the close-out covers and bolts (one each side of engine).
14. Lower the vehicle.
15. Remove engine mount bolts (3) each side.
16. Raise the vehicle. Refer to Vehicle Lifting.
17. Remove the engine oil pan. Refer to Oil Pan Removal
18. Clean and inspect all parts. Refer to Oil Pan Clean and Inspect
INSTALLATION PROCEDURE
IMPORTANT: The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the transmission bellhousing. To ensure the rigidity of the powertrain and correct transmission alignment, it is important that the rear of the block and the rear of the oil pan must NEVER protrude beyond the engine block and transmission bellhousing plane.
1. Apply a 5 mm (0.20 inch) bead of sealant GM P/N 12378190 or equivalent 20 mm (0.8 inch) long to the engine block.
2. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface.
3. Apply a 5 mm (0.20 inch) bead of sealant GM P/N 12378190 or equivalent 20 mm (0.8 inch) long to the engine block.
4. Apply the sealant directly onto the tabs of the rear cover gasket that protrudes into the oil pan surface.
IMPORTANT: Be sure to align the oil gallery passages in the oil pan and engine block properly with the oil pan gasket.
5. Pre-assemble the oil pan gasket to the pan.
- Install the gasket onto the pan.
- Install the oil pan bolts to the pan through the gasket.
6. Install the oil pan, gasket and bolts to the engine block.
7. Snug the oil pan bolts finger tight. Do not overtighten.
8. Install the two lower bellhousing bolts to position the oil pan correctly.
NOTICE: Refer to Fastener Notice in Service Precautions.
9. Snug the lower bellhousing bolt finger tight. Do not overtighten.
9.1. Tighten the oil pan-to-block and oil pan-to-oil pan front cover bolts to 25 Nm (18 ft. lbs).
9.2. Tighten the oil pan-to-rear cover bolts to 12 Nm (106 inch lbs).
9.3. Tighten the bellhousing bolts to 50 Nm (37 ft. lbs).
10. Install the transmission oil cooler pipe retainer and the bolt to the oil pan. Refer to Fastener tightening Specifications.
11. Install the engine oil cooler pipe to oil pan bolt.
- Tighten the nut to 10 Nm (89 lb ft).
12. Install the engine wiring harness retainer bolts to the engine oil pan.
13. Connect the oil level sensor electrical connector.
14. Install the transmission to oil pan bolts.
- Tighten the bolts to 55 Nm (41 lb ft).
15. Install the front differential if equipped with four wheel drive. Refer to Differential Carrier Assembly Replacement in Front Axle.
16. Install the steering linkage shield, if equipped. Refer to Steering Linkage Shield Replacement in Steering.
17. Lower the vehicle.
18. Fill the engine with oil and install the engine oil filter. Refer to Engine Oil and Oil Filter Change.
19. Connect the negative battery cable.