Chrysler Full-Size Vans 1967-1988 Repair Guide

Rear Main Oil Seal

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REMOVAL & INSTALLATION



See Figures 1 through 9

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Fig. Fig. 1: Removing the lower rear main seal half



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Fig. Fig. 2: Apply RTV sealer in the seal groove



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Fig. Fig. 3: Apply RTV sealer around the bolt holes on the rear main seal plate



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Fig. Fig. 4: Installing a rope seal using a special seating tool



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Fig. Fig. 5: Trim the seal ends after seating the rope seal



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Fig. Fig. 6: View of a properly installed rear main seal-318 engine shown, others similar



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Fig. Fig. 7: Offset the split between the seal halves so that they do not match the mating surfaces



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Fig. Fig. 8: Apply RTV sealer to the outer corners of the rear cap



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Fig. Fig. 9: If equipped, insert the side seals carefully to avoid damaging them-diesel engine shown, 400 and 440 similar

Two Piece Seal

  1. Remove the oil pan and the oil pump (if required).
  2.  
  3. Loosen all the main bearing cap bolts, thereby lowering the crankshaft slightly but not to exceed 1 / 32 " (0.8mm).
  4.  
  5. Remove the rear main bearing cap, and remove the oil seal from the bearing cap and cylinder block. On the block half of the seal use a seal removal tool, or install a small metal screw in one end of the seal, and pull on the screw to remove the seal. Exercise caution to prevent scratching or damaging the crankshaft seal surfaces.
  6.  
  7. Remove the oil seal retaining pin from the bearing cap if so equipped. The pin is not used with the split-lip seal.
  8.  
  9. Carefully clean the seal groove in the cap and block with a brush and solvent such as lacquer thinner, spot remover, or equivalent, or trichlorethylene. Also, clean the area thoroughly, so that no solvent touches the seal.
  10.  
  11. Dip the split lip-type seal halves in clean engine oil.
  12.  
  13. Carefully install the upper seal (cylinder block) into its groove with undercut side of the seal toward the FRONT of the engine, by rotating it on the seal journal of the crankshaft until approximately 3 / 8 " (9.5mm) protrudes below the parting surface.
  14.  

Be sure no rubber has been shaved from the outside diameter of the seal by the bottom edge of the groove. Do not allow oil to get on the sealer area.

  1. Tighten the remaining bearing cap bolts to the specifications listed in the Torque chart at the beginning of this guide.
  2.  
  3. Install the lower seal in the rear main bearing cap under undercut side of seal toward the FRONT of the engine, allow the seal to protrude approximately 3 / 8 " (9.5mm) above the parting surface to mate with the upper seal when the cap is installed.
  4.  
  5. Apply an even 1 / 16 " (1.6mm) bead of RTV silicone rubber sealer, to the areas shown, following the procedure given in the illustration.
  6.  

This sealer sets up in 15 minutes.

  1. Install the rear main bearing cap. Tighten the cap bolts to specifications.
  2.  
  3. Install the oil pump and oil pan. Fill the crankcase with the proper amount and type of oil.
  4.  
  5. Operate the engine and check for oil leaks.
  6.  

One Piece Seal

  1. Remove the transmission, clutch assembly or converter and flywheel.
  2.  
  3. (See Step 7 for diesel engines). Lower the oil pan if necessary for working room.
  4.  
  5. On gasoline engines, use an awl to punch two small holes on opposite sides of the seal just above the split between the main bearing cap and engine block. Install a sheet metal screw in each hole. Use two small prybars and pry evenly on both screws using two small blocks of wood as a fulcrum point for the prybars. Use caution throughout to avoid scratching or damage to the oil seal mounting surfaces.
  6.  
  7. When the seal has been removed, clean the mounting recess.
  8.  
  9. Coat the seal and block mounting surfaces with oil. Apply white lube to the contact surface of the seal and crankshaft. Start the seal into the mounting recess and install with a seal driver.
  10.  
  11. Install the remaining components in the reverse of removal.
  12.  

 
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