S10 Pickup, Sonoma 2000-2004

Timing Chain Cover & Seal

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Removal & Installation



2.2L Engine
  1. Remove or disconnect the following:

    Negative battery cable
     
    Drive belt
     
    Cooling fan assembly and pulley
     
    Crankshaft pulley and hub
     
    Belt tensioner/idler pulley assembly
     
    Front oil pan-to-front cover nuts or studs
     
    Starter
     
    Alternator and brackets from the engine, then position them aside
     
    Oil pan bolts, loosen but do not remove
     
    Crankcase (timing) front cover bolts and the cover. Make sure all bolts are removed and be careful not to force and damage the cover.
     
    Old crankshaft seal from the cover using a suitable prytool. Be very careful not to distort the front cover or to score the end of the crankshaft.
     

  2.  

To install:

  1. Carefully remove all traces of gasket or sealant from the mating surfaces.
  2.  
  3. Lubricate the lips of a new seal with clean engine oil, then use a seal centering tool (such as J-35468) to install the seal to the front cover. Leave the tool in position in the seal until the cover is installed.
  4.  
  5. Apply a 3 / 8 in. (10mm) wide by 5 / 16 (5mm) thick bead of RTV sealer to the oil pan at the front crankcase cover sealing surface. Then apply a 1 / 4 in. (6mm) by 1 / 8 in. (3mm) thick bead of RTV to the crankcase front cover at the block sealing surface.
  6.  
  7. Install or connect the following:

    Crankcase front cover to the engine using the seal tool to assure it is properly centered and prevent damage to the hub. Tighten the cover retaining bolts to 97 inch lbs. (11 Nm), then remove the seal centering tool.
     
    Oil pan bolts
     
    Starter
     
    Alternator with brackets
     
    Belt tensioner/idler pulley assembly
     
    Belt assembly
     
    Crankshaft pulley and hub
     
    Cooling fan assembly and pulley
     
    Negative battery cable
     

  8.  

4.3L Engine
  1. Remove or disconnect the following:
    WARNING
    The outer ring (weight) of the torsional damper is bonded to the hub with rubber. The damper must be removed with a puller that acts on the inner hub only. Pulling on the outer portion of the damper will break the rubber bond or destroy the tuning of the unit.


    NOTE
    Depending upon the year of your truck, you may just need to loosen the oil pan bolts, or you may need to remove it completely.



    Negative battery cable
     
    Drain the engine cooling system.
     



    Crankshaft pulley and damper
     



    Water pump assembly
     
    Crankshaft Position (CKP) sensor
     



    Oil pan or loosen bolts, as applicable
     
    Crankshaft Position (CKP) sensor, if equipped
     
    Front cover bolts and the reinforcements, if equipped
     
    Front cover from the engine
     

  2.  
  3. 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.
  4.  

To install:


NOTE
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 or connect the following:

    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.
     
    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 in. (25mm) in both directions from each of the four corners.
     
    Front cover retaining bolts and tighten to 106 inch. lbs. (12 Nm)
     

  4.  
  5. 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.

    CKP sensor O-ring and the sensor, if equipped
     
    Oil pan, if removed
     
    Tighten the oil pan bolts
     
    Water pump
     
    Crankshaft damper and pulley
     
    Negative battery cable
     

  6.  
  7. Properly refill the engine cooling system.
  8.  
  9. 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

  10.  

 
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