Oil Pan: Service and Repair

Oil Pan Replacement

Removal Procedure
1. Remove the tires and wheels.





2. Remove the engine shield bolts and shield.
3. Drain the engine oil.





4. Remove the left and right antilock brake switch (ABS) wiring harnesses from the retainers.





5. Remove the brake hose retaining bolts from the frame.





6. Remove the front shock upper retaining nuts.
7. Remove the upper ball joint pinch nut and bolt.

Important: It is not necessary to remove the wheel driveshafts from the steering knuckles.





8. Remove the left and right wheel driveshafts.





9. Using mechanic's wire or metal hooks, secure the front shock modules to the frame. DO NOT let the shock modules and steering knuckle hang without supporting them.
10. Secure the wheel drive shafts to the frame.
11. Reference mark the relationship of the propeller shaft to the front axle pinion yoke.
12. Remove the yoke retainer bolts and yoke retainers from the front axle pinion yoke.
13. Disconnect the propeller shaft from the front axle pinion yoke. Wrap the bearing caps with tape in order to prevent the loss or the bearing rollers.
14. Remove the steering gear.





15. Remove the oil level indicator tube.





16. Remove the transmission oil cooler lines from the retainer.
17. Remove the transmission oil cooler line retaining bracket bolt and bracket.
18. Remove the inner axle shaft.





19. Remove the starter.
20. Remove the battery cable channel bolt from the front of the oil pan.
21. Remove the battery cable channel from the oil pan.
22. Loosen the 2 upper air conditioning (A/C) compressor bracket bolts.





23. Remove the 2 lower A/C compressor bracket bolts.





24. Remove the front differential and secure it to the frame.





25. Remove the 2 lower bellhousing bolts.
26. Remove the oil pan bolts.





27. Remove the oil pan.

Important: DO NOT allow foreign material to enter the oil passages of the oil pan, cap or cover the openings as required.





28. Drill out the oil pan gasket retaining rivets (2), if required.
29. Remove the gasket (1) from the pan.
30. Discard the gasket and rivets.
31. Clean and inspect the oil pan.

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.
^ 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 P/N 12378190, 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 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 protrudes into the oil pan surface.
3. Pre-assemble the oil pan gasket to the pan.
^ Install the gasket onto the pan.
^ Install the oil pan bolts to the pan and through the gasket.
4. Install the oil pan, gasket and bolts to the engine block.





5. Tighten the oil pan bolts until snug. Do not overtighten.

Notice: Refer to Fastener Notice in Service Precautions.





6. Install the 2 lower bellhousing bolts.
6.1. Tighten the lower bellhousing bolts to 50 Nm (37 ft. lbs.).
6.2. Tighten the oil pan to rear cover bolts to 12 Nm (106 inch lbs.).
6.3. Tighten the oil pan bolts to 25 Nm (18 ft. lbs.).





7. Unsecure and install the differential.
^ Tighten the bolts to 83 Nm (63 ft. lbs.).
8. Install the 2 lower A/C compressor bracket bolts.
9. Tighten the 2 upper A/C compressor bracket bolts.
^ Tighten the bolts to 50 Nm (37 ft. lbs.).
10. Install the battery cable channel to the oil pan.





11. Install the battery cable channel bolt to the oil pan.
^ Tighten the bolt to 12 Nm (106 inch lbs.).
12. Install the starter.
13. Install the inner axle shaft.





14. Install the transmission oil cooler line retaining bracket and bolt.
^ Tighten the bolt to 9 Nm (80 inch lbs.).





15. Install the transmission oil cooler lines to the retainer.
16. Install the oil level indicator tube.
17. Install the steering gear.
18. Align the reference marks on the propeller shaft to the marks on the front axle pinion yoke.
19. Connect the propeller shaft to the front axle pinion yoke.
20. Install the yoke retainers and yoke retainer bolts to the front axle pinion yoke.
^ Tighten the bolts to 20 Nm (15 ft. lbs.).





21. Unsecure the wheel driveshafts from the frame.





22. Unsecure the front shock modules from the frame.
23. Install the upper ball joint pinch nut and bolt.
^ Tighten the nut to





24. Install the left and right wheel driveshafts.





25. Install the front shock upper retaining nuts.
^ Tighten the nuts to 100 Nm (74 ft. lbs.)).





26. Install the brake hose retaining bolts to the frame.
^ Tighten the bolts to 25 Nm (18 ft. lbs.).





27. Install the left and right ABS wiring harnesses to the retainers.
28. Fill the engine with oil.





29. Install the engine shield and bolts.
^ Tighten the bolts to 25 Nm (18 ft. lbs.).
30. Install the tires and wheels.