Oil Pan Replacement
Oil Pan ReplacementRemoval Procedure
1. Remove the front suspension crossmember.
2. Remove the oil pan drain plug and allow the oil to drain.
3. Re-install the engine oil drain plug until snug.
Important: It is not necessary to remove the oil pan (lower) in order to remove the oil pan.
4. If oil pan and/or gasket removal or replacement is NOT required proceed to step 10.
If the oil pan (lower) gasket replacement is required proceed to the next step.
5. If replacement of the oil pan (lower) gasket is needed, perform the following:
6. Remove the oil pan (lower) bolt (1-15).
7. Separate the oil pan (lower) (3) from the oil pan (1).
8. Remove the oil pan (lower) gasket (2).
9. Clean the oil pan (lower) gasket surface. For the oil pan (lower) installation, refer to step 13 in the installation procedure.
10. Remove the starter motor.
11. Remove the left transmission cover bolt and cover.
12. Remove the engine! oil filter and allow the oil to drain.
13. Re-install the engine oil filter until snug.
14. Remove the automatic transmission fluid cooler line clamp bolt at the right transmission cover, if equipped.
15. Remove the automatic transmission fluid cooler line clamp bolt at the oil pan, if equipped.
16. Remove the right transmission cover bolt and cover.
17. Remove the bottom 2 flywheel housing-to-oil pan bolts.
18. Disconnect the engine oil level sensor electrical connector (2).
19. Disconnect the engine oil temperature sensor (3) electrical connector.
20. Remove the oil pan bolts.
Important: 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 oil pan gasket rivets.
DO NOT reuse the oil pan gasket. When installing the oil pan, install a NEW oil pan gasket.
Removal of the oil pan (lower) will not provide access to the crankshaft oil deflector, crankshaft, or other internal engine components.
21. Lower the oil pan, rotate the pan until it can be removed from around the oil pump screen.
22. Remove the engine oil filter.
23. Clean and inspect the engine oil pan.
Installation Procedure
Important: All gasket surfaces should be free of oil or other foreign material during assembly.
The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the flywheel housing cover. 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 are flush or even. The rear of the oil pan must NEVER protrude beyond the engine block. Do NOT reuse the oil pan gasket. It is not necessary to rivet the NEW gasket to the oil pan.
1. Apply a 5 mm (0.20 inch) bead of sealant GM U.S. P/N 123.78190, or equivalent 20 mm (0.80 inch) long to the engine block. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface.
2. Apply a 5 mm (0.20 inch) bead of sealant GM U.S. P/N 12378190, or equivalent 20 mm (0.80 inch) long to the engine block. Apply the sealant directly onto the tabs of the rear cover gasket that protrude 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.
3. Pre-assemble the oil pan gasket to the pan.
3.1. Install the gasket onto the oil pan.
3.2. Install the oil pan bolts to the pan and through the gasket.
3.3. Install the oil pan, gasket and bolts to the engine block.
3.4. Tighten the oil pan bolts until snug. Do not overtighten.
4. Install the 2 bottom flywheel housing bolts to position the oil pan correctly.
Notice: Refer to Fastener Notice in Service Precautions.
5. Tighten the 2 bottom flywheel housing bolts until snug. Do not overtighten.
5.1. Tighten the oil pan bolt and oil pan-to-front cover bolts to 25 Nm (18 ft. lbs.).
5.2. Tighten the oil pan-to-rear cover bolts to 12 Nm (106 inch lbs.).
5.3. Tighten the flywheel housing bolts to 50 Nm (37 ft. lbs.).
6. Connect the engine oil temperature sensor (3) electrical connector.
7. Connect the engine oil level sensor electrical connector (2).
8. Install the right transmission cover and bolt.
Tighten the right transmission cover bolt to 12 Nm (106 inch lbs.).
9. Install the automatic transmission fluid cooler line clamp bolt-at-the oil pan, if equipped.
Tighten the automatic transmission fluid cooler line clamp bolt-at-the oil pan to 12 Nm (106 inch lbs.).
10. Install the automatic transmission fluid cooler line clamp bolt-at-right transmission cover, if equipped.
Tighten the automatic transmission fluid cooler line bolt-at-right transmission cover to 2.5 Nm (22 inch lbs.).
11. Install the left transmission cover and bolt.
Tighten the left transmission cover bolt to 12 Nm (106 inch lbs.).
12. Install the starter motor.
13. Install the oil pan (lower) (3) and gasket (2) to the oil pan (1).
14. Install the oil pan bolts (4).
15. Tighten the oil pan (lower) bolts (1-15) in a crossing pattern, alternating from side-to-side.
Tighten the oil pan (lower) bolts to 12 Nm (106 inch lbs.).
16. Install a NEW engine oil filter.
Tighten the engine oil filter to 30 Nm (22 ft. lbs.).
17. Install the oil pan drain plug.
Tighten the oil pan drain plug to 25 Nm (18 ft. lbs.).
18. Install the front suspension crossmember to the vehicle.
19. Fill the crankcase with the proper quantity and grade of engine oil.
20. Check the transmission fluid, add if necessary.
21. Run the engine and check for leaks.