Jeep CJ/Scrambler 1971-1986 Repair Guide

Oil Pan

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See Figures 1, 2, 3, 4, 5 and 6

REMOVAL & INSTALLATION



4-134 and 6-225 Engines
  1. Disconnect the battery ground.
  2.  
  3. Raise and support the truck on jackstands.
  4.  
  5. Drain the oil.
  6.  
  7. Unbolt and remove the oil pan.
  8.  

To install:
  1. Clean the gasket surfaces thoroughly.
  2.  
  3. Install a replacement seal at the bottom of the timing case cover and at the rear bearing cap.
  4.  
  5. Using new gaskets, install the pan and torque the bolts to 15 ft. lbs.
  6.  



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Fig. Fig. 1: Oil pan assembly used on the 4-134 engine



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Fig. Fig. 2: Oil pan assembly used on the 6-225 engine

4-150 Engine
  1. Disconnect the battery ground.
  2.  
  3. Raise and support the truck on jackstands.
  4.  
  5. Drain the oil.
  6.  


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.

  1. Disconnect the exhaust pipe at the manifold.
  2.  
  3. Remove the starter.
  4.  
  5. Remove the bell housing access plate.
  6.  
  7. Unbolt and remove the oil pan.
  8.  

To install:
  1. Clean the gasket surfaces thoroughly.
  2.  
  3. Install a replacement seal at the bottom of the timing case cover and at the rear bearing cap.
  4.  
  5. Using new gaskets coated with sealer, install the pan and torque the bolts to 10 ft. lbs.
  6.  
  7. Install all other parts in reverse order of removal.
  8.  



Click image to see an enlarged view

Fig. Fig. 3: Oil pan assembly used on the 4-150 engine

4-151 Engine
  1. Disconnect the battery ground.
  2.  
  3. Raise the vehicle and support it on jackstands.
  4.  
  5. Drain the oil.
  6.  


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.

  1. Remove the starter.
  2.  
  3. Unbolt and remove the oil pan.
  4.  

To install:
  1. Clean all gasket surfaces, and remove all sludge and deposits from the pan.
  2.  
  3. Install the rear pan gasket in the main bearing cap and apply a small amount of RTV sealant in the depressions where the pan gasket contacts the block.
  4.  
  5. Position the gasket on the pan. Apply a 1 / 8 x 1 / 4 in. (3mm x 6mm) bead of RTV sealant at the split lines of the front and side gaskets.
  6.  
  7. Position the pan on the block carefully to avoid gasket misalignment. Install the bolts and tighten them to 45 inch lbs.
  8.  
  9. Install the starter. Tighten the bolts to 17 ft. lbs.; the nut to 40 inch lbs.
  10.  
  11. Connect the starter cables, lower the vehicle, fill the crankcase and run the engine to operating temperature, checking for leaks.
  12.  



Click image to see an enlarged view

Fig. Fig. 4: Oil pan assembly used on the 4-151 engine

6-232, 6-258 and 8-304 Engines
  1. Raise the vehicle and drain the engine oil.
  2.  


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.

  1. Remove the starter motor.
  2.  
  3. Place a jack under the transmission bell housing. Disconnect the engine right support cushion bracket from the block and raise the engine to allow sufficient clearance for oil pan removal.
  4.  
  5. Remove the oil pan attaching bolts and remove the oil pan.
  6.  

To install:
  1. Remove the oil pan front and rear neoprene oil seals and the side gaskets. Thoroughly clean the gasket surfaces of the oil pan and the engine block. Remove all of the sludge and dirt from the oil pan sump.
  2.  
  3. Apply a generous amount of RTV silicone to the end tabs of a new oil pan front seal and install the seal to the timing case cover.
  4.  
  5. Cement new oil pan side gaskets into position on the engine block and apply a generous amount of RTV silicone to the side gasket contacting surface of the seal end tabs.
  6.  
  7. Install the seal in the recess of the rear main bearing cap, making sure that it is fully seated.
  8.  
  9. Coat the oil pan contacting surface of the front and rear oil pan seals with engine oil.
  10.  
  11. Install the oil pan and assemble the engine mount in the reverse order of removal.
  12.  



Click image to see an enlarged view

Fig. Fig. 5: Oil pan assembly used on the 6-232 and 6-258



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Fig. Fig. 6: Removing the oil pan from the 8-304 engine

 
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