DeVille, Eldorado, Seville 1999-2005

Camshaft, Bearings & Lifters

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Bearing Replacement



The camshaft journals are supported by bearings machined directly into the aluminum-alloy cylinder heads.

  1. With the camshafts removed, inspect the bearings for the following conditions:

    Excessive scoring or pitting
     
    Discoloration from overheating
     
    Deformation from excessive wear, especially the camshaft lobes
     

  2.  
  3. If any of the above conditions exist on the camshaft bearings, replace the cylinder head.
  4.  

Inspection




NOTE
Special Tool J7872 or equivalent dial indicator is required for the following procedure.



Click image to see an enlarged view

Fig. Inspect camshaft in these areas.

  1. Inspect the camshaft sprocket locating pin for damage or wear.
  2.  
  3. Inspect the threads for the camshaft sprocket bolt.
  4.  
  5. Inspect the camshaft lobes and journals for the following conditions:

    Excessive scoring or pitting.
     
    Discoloration from overheating.
     
    Deformation from excessive wear, especially the camshaft lobes.
     

  6.  
  7. Inspect the left intake camshaft for the following additional conditions:

    Excessive wear on the sealing surface for the camshaft seal.
     
    Damage to the threads for the water pump drive belt pulley bolt.
     

  8.  
  9. If any of the above conditions exist on the camshaft, replace the camshaft.
  10.  
  11. Measure the camshaft journals for diameter and out-of-round using an outside micrometer:

    If the diameter is smaller than 26.948 mm (1.061 in), replace the camshaft.
     
    If the out-of-round exceeds 0.022 mm (0.0009 in), replace the camshaft.

    Click image to see an enlarged view

    Fig. Using micrometer on camshaft journals.

     

  12.  
  13. Measure the camshaft runout using tool J7872 or equivalent.
  14.  
  15. Measure the camshaft thrust wall width for wear using an inside micrometer.
  16.  
  17. Measure the camshaft thrust wall surface for runout using tool J7872.

    Click image to see an enlarged view

    Fig. Thrust wall and thrust wall width.

  18.  
  19. If the camshaft is damaged or worn beyond specifications, replace the camshaft. No machining of the camshaft is allowed.
  20.  
  21. Measure the camshaft lobes for wear using tool J7872.

    Place the tool with the indicator tip on the base circle (2) of the camshaft lobe.
     
    Place the dial at zero.
     
    Rotate the camshaft until the indicator tip is at the highest point on the lobe. This reading is the lift (1) of the camshaft lobe.

    Click image to see an enlarged view

    Fig. Camshaft lobe profile; see text for identification.

     

  22.  
  23. The specifications for lift are as follows:

    1999, V.I.N. Y-Intake camshaft: 8.6mm (0.339 in.); Exhaust camshaft: 8.6mm (0.339 in.)
     
    1999, V.I.N. 9-Intake camshaft: 9.4mm (0.370 in.); Exhaust camshaft: 8.6mm (0.339 in.)
     
    2000-05, All models-Intake camshaft: 6.154mm (0.2423 in.); Exhaust camshaft: 5.944mm (0.2336 in.)
     

  24.  
  25. If the indicated measurement is significantly lower than these specifications, replace the camshaft or engine performance will be reduced.
  26.  

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove both camshaft covers.
  4.  
  5. Secure the camshaft sprockets to the timing chain by installing tie wraps through the camshaft sprocket holes.
  6.  
  7. Working behind the sprockets, install camshaft Chain Holder J38822 so that it is positioned between the chain tensioner and guide. Apply tension to the tool by tightening the tension adjusting screw.
  8.  
  9. Remove or disconnect the following:

    Both camshaft sprocket bolts
     
    Both camshaft sprockets
     

  10.  
  11. Alternately loosen the camshaft bearing cap screws a few turns at a time until all valve spring pressure has been released.
  12.  
  13. Remove the bolts and bearing caps.
  14.  
  15. Remove the camshaft.
  16.  

To install:

  1. Lubricate the camshaft lobes and camshaft journals with clean engine oil.
  2.  
  3. Position the camshaft bearing caps in the cylinder head and loosely install the bolts.
  4.  
  5. Tighten the camshaft bearing cap bolts in the sequence shown, to 44 inch lbs. (5 Nm), plus 30 degrees.
  6.  
  7. Using the hex cast into the camshaft, position the camshafts to accept the camshaft sprockets.
  8.  
  9. Install the camshaft sprockets onto the camshafts. Torque the bolts to 89 ft. lbs. (120 Nm).
  10.  
  11. Remove the Chain Holder J38822 and the tie wraps.
  12.  
  13. Install the left and right camshaft covers.

    Click image to see an enlarged view

    Fig. Left cylinder head camshaft bearing cap torque sequence- 4.6L engine



    Click image to see an enlarged view

    Fig. Right cylinder head camshaft bearing cap torque sequence- 4.6L engine

  14.  

 
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