Escalade, Suburban 1500 & 2500, Tahoe, Yukon, Yukon XL 1500 & 2500 (2006-2007), Yukon Denali and Yukon Denali XL (2005-2006)

Timing Chain & Sprockets

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Removal & Installation



4.8L, 5.3L, 6.0L & 6.2L Engines
  1. Drain the cooling system.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Front cover and gasket. Discard the front cover gasket.
     
    Oil pump
     

  4.  
  5. Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned.
    NOTE
    Do not turn the crankshaft assembly after the timing chain has been removed in order to prevent damage to the piston assemblies or the valves.

  6.  
  7. Remove or disconnect the following:

    Click image to see an enlarged view

    Fig. Sprocket and chain removal-4.8L, 5.3L, 6.0L and 6.2L engines



    Camshaft sprocket bolts
     
    Camshaft sprocket and timing chain
     
    Crankshaft sprocket
     
    Crankshaft sprocket key
     

  8.  

To install:

Click image to see an enlarged view

Fig. Crankshaft sprocket installation-4.8L, 5.3L, 6.0L and 6.2L engines

  1. Install or connect the following:

    Key into the crankshaft keyway
     
    Crankshaft sprocket onto the front of the crankshaft. Align the crankshaft key with the crankshaft sprocket keyway. Rotate the crankshaft sprocket until the alignment mark is in the 12 o'clock position.
     
    Camshaft sprocket and timing chain. Locate the camshaft sprocket alignment mark in the 6 o'clock position.
     
    Camshaft sprocket bolts and tighten to 26 ft. lbs. (35 Nm)

    Click image to see an enlarged view

    Fig. Timing mark alignment-4.8L, 5.3L, 6.0L and 6.2L engines

     

  2.  
  3. Install the oil pump and the front cover. Be sure to use a new gasket and oil seal.
  4.  

8.1L Engine

NOTE
This procedure requires the use of Crankshaft Sprocket Installer tool No. J 22102 and Crankshaft Protector Button tool No. J 42846.

  1. Drain the cooling system.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Front cover bolts, front cover and gasket
     

  4.  
  5. Align the timing marks on the camshaft and crankshaft sprockets.

    Camshaft sprocket bolts
     
    Camshaft sprocket and timing chain
     

  6.  
  7. Install Crankshaft Protector Button tool No. J 42846 into the end of the crankshaft and remove the crankshaft sprocket using a 3-jawed puller.
  8.  
  9. Clean and inspect the timing chain and sprockets.
  10.  

To install:

  1. Use the Crankshaft Sprocket Installer tool No. J 22102 to install the crankshaft sprocket. Align the keyway of the sprocket with the crankshaft pin.
  2.  
  3. Remove the installation tool.
  4.  
  5. Rotate the crankshaft until the crankshaft sprocket alignment mark is in the 12 o-clock position.
  6.  
  7. Install the camshaft sprocket and timing chain, noting the following important points:
    1. The cam sprocket must be installed with the alignment mark at the 6 o-clock position.
    2.  
    3. The sprocket teeth must mesh with the timing chain to avoid damaging the camshaft retainer.
    4.  
    5. Never use a hammer to install the sprocket onto the camshaft.
    6.  

  8.  
  9. Make sure the crankshaft sprocket is alignment at the 12 o-clock position and the cam sprocket is at the 6 o-clock position.
  10.  
  11. Install the camshaft sprocket bolts and tighten, in two passes, to 22 ft. lbs. (30 Nm)
  12.  
  13. Install the front cover.
  14.  
  15. Fill the cooling system with the proper type and quantity of antifreeze.
  16.  

 
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