Chevrolet Full Size Cars 1979-1989

Oil Pan

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REMOVAL & INSTALLATION





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Fig. Fig. 1 One method of raising the engine is to use a block of wood under the crankshaft damper



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Fig. Fig. 2 With the engine weight off of the mounts, loosen the motor mount through bolts



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Fig. Fig. 3 Remove the through bolt so the engine may be lifted for additional oil pan clearance



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Fig. Fig. 4 One method of supporting the engine (once it is raised) is to reinstall the through bolt and allow it to rest on the frame mount



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Fig. Fig. 5 With the engine lifting device and wood out of the way, loosen the front pan retaining bolts



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Fig. Fig. 6 Be sure to remove all of the bolts located around the flange of the oil pan



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Fig. Fig. 7 Carefully pry the oil pan downward to break the gasket seal



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Fig. Fig. 8 Once the gasket seal is broken, tilt the rear of the pan downward and begin to pull it from the engine



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Fig. Fig. 9 Once the rear of the pan is past the front crossmember, the pan is free to be lowered from the vehicle



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Fig. Fig. 10 Don't forget the old pan-to-front cover seal

Pan removal for most engines may be easier if the engine is turned to No. 1 cylinder firing position. This positions the crankshaft in the path of least resistance for pan removal.

Inline 6-Cylinder Gasoline Engine
  1. Disconnect the battery ground cable.
  2.  
  3. Remove the upper radiator mounting bolts or side mount bolt.
  4.  
  5. Position a drain pan to catch any escaping fluid, then remove the upper and lower hoses for the water pump.
  6.  
  7. Install a piece of heavy cardboard between the fan and the radiator in order to protect the components.
  8.  
  9. Disconnect the fuel suction line from the fuel pump.
  10.  
  11. Raise and support the vehicle safely using jackstands, then drain the oil.
  12.  
  13. Remove the starter assembly.
  14.  
  15. Remove the converter lower pan and splash shield.
  16.  
  17. Rotate the crankshaft until the timing mark on the damper is at the six o'clock position.
  18.  
  19. Remove the brake line retaining bolts from the crossmember and move the brake line out of the way.
  20.  
  21. Remove the through-bolts from the front motor mounts.
  22.  
  23. Remove the oil pan bolts.
  24.  
  25. Slowly raise the engine until the motor mounts can be removed from the frame brackets.
  26.  
  27. Remove the mounts and continue to raise the engine until it has been raised three inches. Make sure that none of the engine mounted components are damaged by contact with the vehicle's body or frame.
  28.  
  29. Remove the oil pan by pulling it down from the engine and then twisting it into the opening left by the removal of the left engine mount.
  30.  
  31. When the pan is clear of the engine, tilt the front up and remove it by pulling it down and to the rear.
  32.  

To install:

  1. Thoroughly clean the gasket mating surfaces.
  2.  
  3. Install the oil pan to the engine block by reversing the tilting necessary to remove it. Be sure to use a new gasket during installation.
  4.  
  5. Install the oil pan retaining bolts, then torque the side bolts to 6-8 ft.lbs. (8-11 Nm) and the end bolts to 9-12 ft. lbs. (12-16 Nm).
  6.  
  7. Install the motor mounts, then carefully lower the engine into position and install the mount through-bolts.
  8.  
  9. Reposition the brake line and install the brake line retaining bolts to the crossmember.
  10.  
  11. Install the converter lower pan and splash shield.
  12.  
  13. Install the starter assembly.
  14.  
  15. Make sure the oil pan drain plug is installed, then remove the jackstands and carefully lower the vehicle.
  16.  
  17. Fill the engine crankcase with the proper amount of clean engine oil. This should be done right away to eliminate the danger of forgetting it later and attempting to start a dry engine.
  18.  
  19. Connect the fuel suction line to the fuel pump.
  20.  
  21. Remove the cardboard from between the fan and the radiator.
  22.  
  23. Connect the upper and lower hoses to the water pump.
  24.  
  25. Install the upper radiator mounting bolts or side mount bolt.
  26.  
  27. Connect the negative battery cable.
  28.  
  29. Check the engine oil level and add, as necessary.
  30.  
  31. Run the engine and check for leaks, then check and top off the coolant, as necessary.
  32.  

V6 Engine


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Fig. Fig. 11 Oil pan installation 231 V6 engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the upper half of the radiator fan shroud.
  4.  
  5. Raise the front of the vehicle and support safely using jackstands, then drain the engine oil.
  6.  
  7. Unscrew the exhaust pipe cross-over tube mounting nuts at the manifold. Lower the crossover tube.
  8.  
  9. Remove the torque converter cover and the transmission fluid cooler lines at the oil pan.
  10.  
  11. Remove the upper bolt on the starter brace and then remove the inboard starter bolt and swing the starter assembly aside.
  12.  
  13. If equipped with Air Injection Reaction (AIR) system, disconnect the AIR hose from the converter pipe and the AIR pipe from the exhaust manifold.
  14.  
  15. Loosen and remove the left hand motor mount through-bolt and then loosen the through-bolt on the right hand mount.
  16.  
  17. Raise the engine and then reinstall the through-bolt in the left hand motor mount. Do not tighten the bolt.
  18.  
  19. Unscrew the attaching bolts and remove the oil pan from under the engine.
  20.  

To install:

  1. Thoroughly clean the gasket and seal surfaces.
  2.  
  3. Install the oil pan to the engine using new gaskets and seals or RTV sealant, as required.
  4.  
  5. Remove the left motor mount through bolt, carefully lower the engine into position.
  6.  
  7. Install and tighten the motor mount through-bolts.
  8.  
  9. If equipped with Air Injection Reaction (AIR) system, connect the AIR hose to the converter pipe and the AIR pipe to the exhaust manifold.
  10.  
  11. Swing the starter assembly into position and secure.
  12.  
  13. Install the torque converter cover and connect the transmission fluid cooler lines to the oil pan.
  14.  
  15. Reposition the crossover tube, then secure using the mounting nuts.
  16.  
  17. Make sure the oil pan drain plug is installed, then remove the jackstands and carefully lower the vehicle.
  18.  
  19. Refill the engine crankcase with clean oil. This should be done right away in order to prevent an accidental attempt to start a dry engine.
  20.  
  21. Install the upper half of the radiator fan shroud.
  22.  
  23. Connect the negative battery cable, then run the engine and check for leaks.
  24.  

V8 Gasoline Engine


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Fig. Fig. 12 Oil pan installation Chevrolet small block V8 engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the air cleaner assembly, the upper radiator mounting panel and the fan shroud.
  4.  
  5. Remove the distributor cap and the fan assembly.
  6.  
  7. If equipped, disconnect the AIR hose from the converter pipe and the AIR pipe from the exhaust manifold.
  8.  
  9. Raise and support the vehicle safely using jackstands. Drain the oil from the engine.
  10.  
  11. Remove the exhaust crossover pipe from the manifold and the catalytic converter.
  12.  

On some models, it may be necessary to remove the starter.

  1. Remove torque converter housing cover plate, then disconnect the transmission fluid cooler lines at the oil pan.
  2.  
  3. Rotate crankshaft until timing mark on torsional damper is at 6 o'clock position, this positions the crankshaft throw in the horizontal place.
  4.  
  5. Remove front engine mount through bolts.
  6.  
  7. Carefully raise the engine and insert blocks under engine mounts.
  8.  

The block thickness should be 3 in.

  1. Remove the oil pan bolts and lower the pan from the engine block.
  2.  

To install:

  1. Using a putty knife, clean the gasket mounting surfaces.
  2.  
  3. Install the oil pan using a new gasket and sealant, as required, then torque the oil pan bolts to 7 ft. lbs. (9 Nm).
  4.  
  5. Remove the blocks and carefully lower the engine, then install the engine mount bolts and tighten to 50 ft. lbs. (68 Nm).
  6.  
  7. Install the torque converter housing cover plate and connect the transmission fluid cooler lines at the oil pan.
  8.  
  9. Install the exhaust crossover pipe to the manifold and the catalytic converter.
  10.  
  11. If removed, install the starter assembly.
  12.  
  13. Make sure the drain plug is installed in the oil pan, then remove the jackstands and carefully lower the vehicle.
  14.  
  15. Refill the engine crankcase with clean oil right away. This will prevent an accidental attempt to start a dry engine.
  16.  
  17. If equipped, connect the AIR hose to the converter pipe and the AIR pipe to the exhaust manifold.
  18.  
  19. Install the distributor cap and the fan assembly.
  20.  
  21. Install the air cleaner assembly, the upper radiator mounting panel and the fan shroud.
  22.  
  23. Connect the negative battery cable.
  24.  
  25. Run the engine and check for leaks.
  26.  

Diesel Engine
  1. Disconnect the batteries and remove the dipstick.
  2.  
  3. Remove the vacuum pump and drive (with air conditioning) or the oil pump drive (without air conditioning).
  4.  
  5. Remove the upper radiator support and fan shroud.
  6.  
  7. Raise and support the vehicle safely using jackstands, then drain the engine oil from the crankcase.
  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. If necessary, remove the starter assembly.
  16.  
  17. Support the engine with a jack.
  18.  
  19. Remove the engine mounts from the block.
  20.  
  21. Raise the front of the engine, then loosen the retaining bolts and remove the oil pan.
  22.  

To install:

  1. Thoroughly clean the gasket sealing surfaces.
  2.  
  3. Install the oil pan to the engine using new gaskets and sealant, as required.
  4.  
  5. Lower the front of the engine and secure the engine mounts to the block.
  6.  
  7. Remove the engine support jack, then if removed, install the starter assembly.
  8.  
  9. Install the oil cooler lines at the filter base.
  10.  
  11. Connect the exhaust and crossover pipes.
  12.  
  13. Install the flywheel cover.
  14.  
  15. Make sure the oil drain plug is installed, then remove the jackstands and carefully lower the vehicle.
  16.  
  17. Immediately refill the engine crankcase with clean oil. This will prevent an accidental attempt to start a dry engine.
  18.  
  19. Install the upper radiator support and fan shroud.
  20.  
  21. Install the vacuum pump and drive (with air conditioning) or the oil pump drive (without air conditioning).
  22.  
  23. Install the dipstick and connect the batteries.
  24.  
  25. Run the engine and check for leaks.
  26.  

 
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