Pontiac Fiero 1984-1988 Repair Guide

Rear Main Oil Seal

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REMOVAL & INSTALLATION



4-2.5L Engine


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Fig. Fig. 1 Remove the rod bearings and crankshaft to gain access to the rear main oil seal

This is a one piece seal and can be replaced without removal of the oil pan or crankshaft.

  1. Remove the transaxle assembly as outlined in the Transaxle removal procedures in .
  2.  
  3. Remove the six flywheel attaching bolts and the flywheel (automatic).
  4.  
  5. If equipped with a (manual) transaxle, remove the pressure plate and disc.
  6.  
  7. Pry out the rear main seal.
  8.  

To install:

  1. Clean the block and crank-shaft-to-seal mating surfaces.
  2.  
  3. Lubricate the outside of the seal for ease of installation and press into the block with your fingers.
  4.  
  5. Install the seal with a Seal Installer tool No. J34924-A or equivalent.
  6.  
  7. Install the flywheel and torque the bolts to the specification in the Torque Specifications chart in the beginning of the section.
  8.  
  9. Install the transaxle assembly.
  10.  

6-2.8L Engine
THIN SEAL


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Fig. Fig. 2 Apply a light coat of assembly lube on the seal and install the seal on the end of the crankshaft

  1. Remove the engine and mount it on a suitable stand as outlined in the Engine removal procedures in this section.
  2.  
  3. Remove the oil pan and oil pump assembly.
  4.  
  5. Remove the front cover, then lock the chain tensioner with a pin, but do not force.
  6.  
  7. Rotate the crankshaft until the timing marks on the cam and crank sprockets align.
  8.  
  9. Remove the camshaft bolt, cam sprocket and timing chain.
  10.  
  11. Rotate the crankshaft to the horizontal position.
  12.  
  13. Remove the rod bearing nuts, caps and bearings.
  14.  

Mark each component so not to mix up bearing caps or bearing.

  1. Remove the crankshaft and the old oil seal.
  2.  

To install:

  1. Apply a light coat of Assembly Lube® or equivalent to the outside of the seal.
  2.  
  3. Install the new seal and tool in the rear area of the crankshaft.
  4.  
  5. Install the crankshaft and tool in the engine.
  6.  
  7. Position the seal tool so that the arrow points toward the cylinder block and remove the tool.
  8.  
  9. Put a light coat of oil on the crankshaft journals.
  10.  
  11. Seal the rear main bearing split line surface with G.M. 1052726 or equivalent.
  12.  
  13. Install the connecting rod and crankshaft caps and torque to the specifications in the Torque Specifications chart in the beginning of this section.
  14.  
  15. Install the oil pump assembly as torque the bolts to 30 ft. lbs. (41 Nm).
  16.  
  17. Install the camshaft sprocket and timing chain cover, oil pan and install the engine into the vehicle as outlined in the Engine installation procedures.
  18.  
  19. Refill the engine with engine oil, coolant and transaxle fluid. Start the engine and check for leaks.
  20.  

THICK SEAL


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Fig. Fig. 3 Remove the thick oil seal from the housing using a prytool



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Fig. Fig. 4 Lubricate the oil seal, then install the seal using the proper installation tool-V6 engine

  1. Refer to the Transaxle removal and installation procedures in and remove the transaxle.
  2.  

If equipped with an manual transaxle, remove the pressure plate and the clutch.

  1. Remove the flywheel from the crankshaft.
  2.  
  3. Using a small prybar, pry the rear oil seal from the housing.
  4.  

When prying the oil seal from the housing, be careful not to damage the machined surfaces.

To install:

  1. Using the seal installation tool J-34686, lubricate the new oil seal lip and slide it onto the installation (dust lip side against the tool) until it seats against the tool.
  2.  
  3. Align the installation tool's dowel pin with the dowel pin hole in the crankshaft. Torque the mounting screws to 2-5 ft. lbs.
  4.  
  5. Turn the "T" handle and push the seal into the housing, until it bottoms out against the housing.
  6.  
  7. Loosen the "T" handle until it comes to a stop. Remove the mounting screws of the installation tool.
  8.  
  9. Check the seal and make sure that it is squarely seated in the bore.
  10.  
  11. Install the flywheel and torque to specifications in the Torque Specifications in this section.
  12.  
  13. Install the transaxle as outlined in the Transaxle installation procedures in .
  14.  
  15. Refill the engine with engine oil. Start the engine and check for oil leaks.
  16.  

 
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