Chevrolet Full-size Cars 1968-1978 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION



Inline 6-Cylinder Engines

Pan removal for all 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.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the upper radiator mounting bolts or side mount bolt. Remove the upper and lower hoses for the water pump.
  4.  
  5. Install a piece of heavy cardboard between the fan and the radiator.
  6.  
  7. Disconnect the fuel suction line from the fuel pump.
  8.  
  9. Raise the vehicle and drain the oil.
  10.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

an environmental tip. Used oil contains heavy metals, and has been determined to be hazardous to the environment. Recycling oil is the best way for disposal. Check local laws and recycle whenever possible.

  1. Remove the starter.
  2.  
  3. Remove the flywheel lower pan or converter lower pan and splash shield.
  4.  
  5. Rotate the crankshaft until the timing mark on the damper is at the six o'clock position.
  6.  
  7. Remove the brake line retaining bolts from the crossmember and move the brake line out of the way.
  8.  
  9. Remove the through-bolts from the from motor mounts.
  10.  
  11. Remove the oil pan bolts.
  12.  
  13. Slowly raise the engine until the motor mounts can be removed from the frame brackets.
  14.  
  15. Remove the mounts and continue to raise the engine until it has been raised three inches.
  16.  
  17. 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.
  18.  
  19. When the pan is clear of the engine, tilt the front up and remove it by pulling it down and to the rear.
  20.  

To install:

  1. Install the oil pan gaskets to the engine block.
  2.  
  3. Install the oil pan and torque the side bolt to 6-8 ft. lbs. and the end bolts to 9-12 ft. lbs.
  4.  
  5. Install the motor mounts.
  6.  
  7. Install the brake line retaining bolts at the crossmember.
  8.  
  9. Install the flywheel lower pan or converter lower pan and splash shield.
  10.  
  11. Install the starter.
  12.  
  13. Connect the fuel suction line at the fuel pump.
  14.  
  15. Remove the cardboard from between the fan and the radiator.
  16.  
  17. Install the upper radiator mounting bolts or side mount bolt. Install the upper and lower hoses.
  18.  
  19. Connect the negative battery cable.
  20.  
  21. Fill the crankcase.
  22.  

V8 Engines


Click image to see an enlarged view

Fig. Fig. 1 Exploded view of the oil pan and related components for small block engines-big block engines are similar

  1. Disconnect the negative battery cable.
  2.  
  3. As a precaution, remove the distributor cap to keep it from getting broken when the engine is raised.
  4.  
  5. Remove the fan shroud retaining bolts.
  6.  
  7. On some vehicles, it may be necessary to remove the radiator upper mounting panel.
  8.  
  9. Raise the vehicle and support it safely. Drain the engine oil.
  10.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

an environmental tip. Used oil contains heavy metals, and has been determined to be hazardous to the environment. Recycling oil is the best way for disposal. Check local laws and recycle whenever possible.

  1. Disconnect the exhaust pipes or crossover pipes. As required, remove the starter.
  2.  
  3. On automatic transmission equipped vehicles, remove the converter housing underpan and splash shield.
  4.  
  5. Rotate the crankshaft until the timing mark on the torsional dampener is at the six o'clock position.
  6.  
  7. The starter can be swung out of the way by disconnecting the brace at the starter, removing the inboard starter bolt and loosening the outboard starter bolts. On some engines the fuel pump may have to be removed.
  8.  
  9. Remove the front engine mount through-bolts.
  10.  
  11. Raise the engine and insert blocks, at least 3 in. thick, under the engine mounts.
  12.  
  13. Remove the oil pan bolts and remove the oil pan.
  14.  

To install:

  1. Position the oil pan to the engine. Be sure to use a new gasket or RTV sealant, as required.
  2.  
  3. Remove the wood blocks. Install the motor mount retaining bolts. As required, install the AIR injection assembly.
  4.  
  5. Install the starter. Install the torque converter cover. Install the transmission oil cooler lines.
  6.  
  7. Lower the vehicle. If removed install the upper half of the radiator fan shroud. Install the exhaust pipe to manifold retaining bolts.
  8.  
  9. Install the distributor cap assembly. Fill the crankcase with the proper grade and type engine oil.
  10.  
  11. Connect the negative battery cable. Start the engine and check for leaks.
  12.  

 
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