GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10

Gasoline Engines

Pan removal may be easier if the engine is turned to No. 1 cylinder firing position. This positions the crankshaft in a position which provides the least interference with pan removal.

  1. Disconnect the negative battery terminal.
  2.  
  3. Remove the fan shroud-to-radiator tie bar screws.
  4.  
  5. Remove the air cleaner and disconnect the throttle linkage.
  6.  
  7. Raise the vehicle and support it on jackstands.
  8.  
  9. Drain the oil.
  10.  
  11. Remove the lower flywheel housing, remove the shift linkage attaching bolt and swing it out of the way, and disconnect the exhaust crossover pipe at the engine.
  12.  
  13. Remove the front engine mounting bolts.
  14.  
  15. Raise the engine by placing a jack under the crankshaft pulley mounting.
  16.  


CAUTION
On air conditioned vehicles, place a support under the right side of the transmission before raising the engine. If you don't do this, the engine and transmission will cock to the right due to the weight of the air conditioning equipment.

  1. Remove the oil pan bolts and remove the pan.
  2.  

To install:
  1. Use gasket sealer and new gaskets (if gaskets are used). Torque the pan bolts to 14 ft. lbs. (18 Nm).
  2.  
  3. Lower the engine with a jack under the crankshaft pulley mounting.
  4.  
  5. Install the front engine mounting bolts.
  6.  
  7. Install the lower flywheel housing, shift linkage attaching bolt, and connect the exhaust crossover pipe at the engine.
  8.  
  9. Refill the engine with oil.
  10.  
  11. Lower the vehicle.
  12.  
  13. Install the air cleaner and connect the throttle linkage.
  14.  
  15. Install the fan shroud-to-radiator tie bar screws.
  16.  
  17. Connect the negative battery terminal.
  18.  



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Fig. Fig. 1: Exploded view of the oil pan assembly

Diesel Engines
  1. Remove the vacuum pump and drive (with A/C or the oil pump drive without A/C).
  2.  
  3. Disconnect the batteries and remove the dipstick.
  4.  
  5. Remove the upper radiator support and fan shroud.
  6.  
  7. Raise and support the vehicle. Drain the oil.
  8.  
  9. Remove the flywheel cover.
  10.  
  11. Disconnect the exhaust and crossover pipes.
  12.  
  13. Remove the oil cooler lines at the filter base.
  14.  
  15. Remove the starter assembly. Support the engine with a jack.
  16.  
  17. Remove the engine mounts from the block.
  18.  
  19. Raise the front of the engine and remove the oil pan.
  20.  

To install:
  1. Install the oil pan, torque the retaining bolts 12 ft. lbs. (16 Nm).
  2.  
  3. Install the engine mounts to the block.
  4.  
  5. Install the starter assembly.
  6.  
  7. Install the oil cooler lines at the filter base.
  8.  
  9. Connect the exhaust and crossover pipes.
  10.  
  11. Install the flywheel cover.
  12.  
  13. Lower the vehicle.
  14.  
  15. Refill the engine with the proper amount of high quality engine oil suitable for diesel engines.
  16.  
  17. Install the upper radiator support and fan shroud.
  18.  
  19. Connect the batteries and install the dipstick.
  20.  
  21. Install the vacuum pump and drive.
  22.  
  23. Start the engine and check for oil leaks.
  24.  



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Fig. Fig. 2: Diesel engine vacuum pump and oil pump drive



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Fig. Fig. 3: Disconnecting the throttle linkage



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Fig. Fig. 4: Removing the shift linkage attaching bolt



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Fig. Fig. 5: Disconnecting the shift linkage from the transmission



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Fig. Fig. 6: Make sure the oil is drained before removing the oil pan bolts



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Fig. Fig. 7: Carefully pry the oil pan away from the engine



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Fig. Fig. 8: Removing the oil pan from the vehicle



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Fig. Fig. 9: The gasket mating surfaces can be cleaned by using a gasket scraper



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Fig. Fig. 10: Removing the oil pan front seal

 
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