BMW Cars 1999-06

Rear Main Seal

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Removal & Installation



The rear main bearing oil seal can be replaced after the transmission and flywheel have been removed from the engine.

  1. Note the radio security code and disconnect the negative battery cable.
  2.  
  3. Raise and safely support the vehicle.
  4.  
  5. Remove the transmission as outlined in Section 7.
  6.  
  7. On manual transmissions, remove the clutch assembly.
  8.  
  9. Remove the flywheel as outlined in this section.
  10.  
  11. Using a suitable seal removal tool, carefully remove the oil seal.
  12.  



Click image to see an enlarged view

Fig. When installing, apply sealer to the joints (as marked) of the rear main seal housing if the housing has been removed

To install:

  1. Inspect the outer edge of the seal housing for nicks or sharp edges. Carefully chamfer the outer edge of the seal housing to remove any sharp edges or nicks.
  2.  
  3. Coat the sealing lips of the new seal with oil and install the new seal into the end cover housing with a suitable seal installation tool. DO NOT coat the outer sealing surface of the seal with sealant or lubricant, the outer sealing surface and seal housing should be clean and dry. On the 6-cylinder engines, press the seal in until it is about 0.039-0.079 inches (0.991-2.070mm) deeper than the standard seal, which was installed flush with the housing.
  4.  
  5. Install the remaining components in the opposite order from which they were removed.
  6.  
  7. Lower the vehicle and connect the negative battery cable.
  8.  
  9. Check and top off all fluid levels.
  10.  
  11. Once the engine is started, check for any fluid leaks.
  12.  
  13. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF .
  14.  



Click image to see an enlarged view

Fig. When installing, apply sealer to the joints (as marked) of the rear main seal housing if it has been removed

The rear main bearing oil seal can be replaced after the transmission and flywheel have been removed from the engine.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Transmission
     
    Flywheel assembly
     
    Oil seal, using a suitable seal removal tool
     

  4.  

To install:

  1. Coat the sealing lips of the new seal with oil and install the new seal into the end cover housing with a suitable seal installation tool. On the 6-cylinder engines, press the seal in until it is about 0.039-0.079 inches (0.991-2.070mm) deeper than the standard seal, which was installed flush with the housing.
  2.  
  3. Install the remaining components in the opposite order from which they were removed.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engineOFF
  8.  
  9. Check and top off all fluid levels.
  10.  



Click image to see an enlarged view

Fig. When installing, apply sealer to the joints (as marked) of the rear main seal housing if it has been removed

The rear main bearing oil seal can be replaced after the transmission and flywheel have been removed from the engine.

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:

    Transmission
     
    Flywheel assembly
     
    Oil seal, using a suitable seal removal tool
     

  4.  

To install:

  1. Coat the sealing lips of the new seal with oil and install the new seal into the end cover housing with a suitable seal installation tool. On the 6-cylinder engines, press the seal in until it is about 0.039-0.079 inches (0.991-2.070mm) deeper than the standard seal, which was installed flush with the housing.
  2.  
  3. Install the remaining components in the opposite order from which they were removed.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF .
  8.  
  9. Check and top off all fluid levels.
  10.  



Click image to see an enlarged view

Fig. Apply sealer to the joints as marked during rear main seal housing installation

The rear main bearing oil seal can be replaced after the transmission and clutch/flywheel or the converter/flywheel has been removed from the engine.

  1. Raise and safely support the vehicle. Drain the engine oil and loosen the oil pan bolts. Carefully use a sharp bladed tool to separate the oil pan gasket from the lower surface of the end cover housing.
  2.  
  3. Remove the 2 rear oil pan bolts.
  4.  
  5. Remove the bolts around the outside of the cover housing and remove the end cover housing from the engine block. Remove the gasket from the block surface.
  6.  
  7. Remove the seal from the housing.
  8.  

To install:

  1. Coat the sealing lips of the new seal with oil. Install a new seal into the end cover housing with a special seal installer tool. On the 6-cylinder engines, press the seal in until it is about 0.039-0.079 in. (0.991-2.070mm) deeper than the standard seal, which was installed flush.
  2.  
  3. While the cover is off, check the plug in the rear end of the main oil gallery. If the plug shows signs of leakage, replace it with another, coating it with the proper sealant to keep it in place.
    NOTE
    Fill the cavity between the sealing lips of the seal with grease before installing.

  4.  
  5. Coat the mating surface between the oil pan and end cover with sealer. Using a new gasket, install the end cover on the engine block and bolt it into place.
  6.  
  7. Install the remaining components in the opposite order from which they were removed.
  8.  
  9. Install and tighten the oil pan drain plug, then fill the engine with the correct viscosity and amount of clean engine oil.
  10.  
  11. Lower the vehicle and connect the negative battery cable.
  12.  
  13. Start the engine and check that oil pressure is present; if the oil pressure lamp does not turn off within 5-7 seconds of starting the engine, turn the engine OFF . Check for any oil leaks.
  14.  



Click image to see an enlarged view

Fig. When installing, apply sealer to the joints (as marked) of the rear main seal housing if it has been removed

The rear main bearing oil seal can be replaced after the transmission and flywheel have been removed from the engine.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove or disconnect the following:

    Transmission
     
    Flywheel assembly
     
    Oil seal, using a suitable seal removal tool
     

  4.  

To install:

  1. Coat the sealing lips of the new seal with oil and install the new seal into the end cover housing with a suitable seal installation tool. On the 6-cylinder engines, press the seal in until it is about 0.039-0.079 inches (0.991-2.070mm) deeper than the standard seal, which was installed flush with the housing.
  2.  
  3. Install the remaining components in the opposite order from which they were removed.
  4.  
  5. Connect the negative battery cable.
  6.  
  7. Start the engine and check that oil pressure is present; if the oil pressure lamp does not extinguish within 5-7 seconds of starting the engine, turn the engine OFF .
  8.  
  9. Check and top off all fluid levels.
  10.  

 
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