Astro, Safari 1997-2005

Timing Chain Cover & Seal

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Drain the engine oil.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Oil pan
     
    Crankshaft balancer
     
    Water pump assembly
     
    Crankshaft Position (CKP) sensor
     
    Front cover bolts and the reinforcements, if equipped
     
    Front cover
     

  8.  
  9. Pry the seal out of the front cover using a small prytool. Be very careful not to distort the front cover or to score the end of the crankshaft.
  10.  

To install:


WARNING
Anytime the front cover is removed, the cover must be replaced upon reassembly. If you reuse the old cover, oil leaks may develop.

  1. Clean the gasket mating surfaces of the engine and cover of all remaining gasket or sealer material. Be careful not to score or damage the surfaces.
    NOTE
    The manufacturer suggests you wait until the front cover is mounted to the engine before you install the replacement crankshaft oil seal. This assures the cover is properly supported.

  2.  
  3. Install new front cover gasket to the engine or cover using gasket cement to hold it in position. Lubricate the front of the oil pan seal with engine oil to aid in reassembly.
  4.  
  5. Install new front cover to the engine. Take care while engaging the front of the oil pan seal with the bottom of the cover. Apply sealer 12346141 to the oil pan rail where it contacts the timing cover-to-block joint (front) and the crankshaft rear seal retainer-to-block joint (rear). Continue the bead of sealant about 1 inch (25mm) in both directions from each of the four corners.
  6.  
  7. Install front cover retaining bolts and tighten to 106 inch lbs. (12 Nm).
  8.  
  9. Lightly coat the lips of the replacement crankshaft seal with clean engine oil, then position the seal with the open end facing inward the engine. Use a suitable seal installation driver to position the seal in the front cover.
  10.  
  11. Install or connect the following:

    Oil pan
     
    CKP sensor O-ring and the sensor
     
    Water pump
     
    Crankshaft balancer
     
    Negative battery cable
     

  12.  
  13. Properly refill the engine cooling system.
  14.  
  15. Run the engine until normal operating temperature has been reached, then check for leaks.

    Click image to see an enlarged view

    Fig. Installing the crankshaft front oil seal-4.3L engines

  16.  

 
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