Oil Pan Replacement (Upper)

Removal Procedure

^ Tools Required
- J 28467-A Engine Support Fixture
- J28467-450 Engine Support Fixture Adapter
- J 36857 Lift Brackets





1. Remove the lower oil pan. Refer to Oil Pan Replacement (Lower) or Oil Pan Replacement (Upper).
2. Remove the engine mount lower nuts from the frame bracket. Note the orientation of the alignment tab (1).





3. Remove the A/C compressor hose strap bolt from the front of the upper oil pan.
4. Remove the four transmission bolts from the upper oil pan.





5. Remove all but the four corner upper oil pan bolts.





6. Match mark the propeller shaft to allow for correct realignment.
7. Remove the propeller shaft bolts.
8. Slide the propeller shaft rearward, away from the transmission.
9. Secure the propeller shaft in place.





10. Remove the catalytic converter hanger bolts (1) from the hanger bracket (2).





11. Remove the catalytic converter nuts from the exhaust manifold.
12. Lower the catalytic converters and secure with mechanic wire.
13. Remove the two idler arm bolts from the frame and lower the relay rod out of the way.
14. Lower the vehicle.

Important: When raising the engine, use care so as not to damage surrounding components and/or attachments to the engine.

15. Use the J 28467-A, the J 28467-450 and the J 36857 to support and raise the engine high enough to enable removal of the upper oil pan.
16. Raise and support the vehicle. Refer to Vehicle Lifting.
17. Remove the remaining upper oil pan bolts.
18. Remove the oil intake pipe bolts.
19. Remove the oil intake pipe.





20. Remove the upper oil pan toward the front of the vehicle.
Use care so as not to damage the aluminum mating surfaces of the upper oil pan.
21. Remove the rubber seal (1).
22. Remove all RTV sealant and thoroughly clean the oil pan housing and engine block.

Installation Procedure





1. Apply a bead of silicone sealing compound, GM P/N 12346286 or equivalent, in the bottom of the upper oil pan groove.
Keep the bead at least 10 mm (0.4 inch) from the bolt holes to prevent carry over onto bolt threads.





2. Install the new rubber seal into the groove of the upper oil pan.

Important: Installation of the upper oil pan must be carried out within 10 minutes of applying the sealant.

3. Apply a 3 mm (0.12 inch) bead of silicone sealant, GM P/N 12346286 or equivalent, on the OUTSIDE edge of the seal at the front of the upper oil pan and apply an identical bead on the INSIDE edge of the seal at the rear of the upper oil pan. The beads will overlap at the middle of the upper oil pan as shown in the supporting illustration.
4. Carefully install the upper oil pan through the front of the vehicle and allow to rest on the crossmember.
5. Install the oil intake pipe.

Notice: Refer to Fastener Notice in Service Precautions.

6. Install the oil intake pipe bolts.
Tighten the oil intake pipe bolts to 8 Nm (71 inch lbs.).
7. Hold the upper oil pan in place with four corner bolts.
8. Lower the vehicle.
9. Carefully lower the engine into place. Ensure the motor mounts are properly aligned.
10. Remove the J 28467-A, the J 28467-450 and the J 36857.
11. Raise and support the vehicle. Refer to Vehicle Lifting.





12. Install the remaining upper oil pan bolts.
Tighten the upper oil pan bolts to 15 Nm (11 ft. lbs.).
13. Install the four transmission bolts to the upper oil pan.
Tighten the four transmission bolts to 40 Nm (30 ft. lbs.).
14. Raise the relay rod and install the bolts for the idler arm.
Tighten the idler arm bolts to 60 Nm (44 ft. lbs.).





15. Raise the catalytic converters into place and install the catalytic converter nuts.
Evenly tighten the catalytic converter nuts to 25 Nm (18 ft. lbs.).





16. Install the catalytic converter bolts (1) into the hangers (2).
Tighten the catalytic converter bolts to 20 Nm (15 ft. lbs.).





17. Slide the propeller shaft into position.
18. Align the propeller shaft with the markings previously scribed in the removal procedure.
19. Install the propeller shaft bolts.
Tighten the propeller shaft bolts to 95 Nm (70 ft. lbs.).





20. Install the A/C compressor hose strap bolt to the upper oil pan.
Tighten the A/C compressor hose strap bolt to 8 Nm (71 inch lbs.).





21. Install the engine mount lower nuts. Note the orientation of the locator tab (1).
Tighten the engine mount lower nuts to 55 Nm (41 ft. lbs.).
22. Install the oil pan. Refer to Oil Pan Replacement (Lower) or Oil Pan Replacement (Upper).
23. Install the splash shield.
24. Install the splash shield bolts.
Tighten the splash shield bolts until fully seated and not stripped.
25. Lower the vehicle.
26. Refill the engine oil. Refer to Capacities -Approximate Fluid.