DeVille, Eldorado, Seville 1999-2005

Timing Chain & Sprockets

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Removal & Installation



Primary Chain/Intermediate Sprocket
  1. Before servicing vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Remove or disconnect the following:
    NOTE
    Align all timing marks prior to removal of the timing chains.



    Engine
     
    Accessory drive belt
     
    Drive belt pulley
     
    Dive belt tensioner
     
    Front cover
     
    Right and left camshaft covers
     



    Timing chain tensioners
     
    Camshaft sprocket bolts
     
    Camshaft sprockets (4)
     
    Right and left secondary chains
     
    Intermediate shaft sprocket bolt and the sprocket
     
    Primary timing sprockets and primary chain off the engine

    Click image to see an enlarged view

    Fig. Primary drive chain components

     

  4.  

To install:


NOTE
The following procedure must be followed to set the camshaft timing on the vehicle.

  1. Install the primary and secondary chain guides.
  2.  
  3. Rotate the crankshaft until the sprocket drive key is at the 1 o'clock position.
  4.  
  5. Install or connect the following:
    NOTE
    The crankshaft sprocket keyway will have to slide over the key on the crankshaft. If it is necessary to turn the crankshaft sprocket, the intermediate shaft sprocket will also have to be turned so the timing mark remains aligned with the crankshaft sprocket.



    Crankshaft sprocket and intermediate shaft sprocket in the primary timing chain so the timing marks are aligned
     
    Primary timing chain assembly
     



    Intermediate shaft sprocket bolt. Torque the bolt to 45 ft. lbs. (61 Nm).
     
    Primary timing chain tensioner. Torque the tensioner mounting bolts to 20 ft. lbs. (27 Nm).
     
    Right and left secondary chains with the timing marks aligned
     
    Camshaft sprockets (4). Torque the bolts to 90 ft. lbs. (120 Nm).
     
    Right and left camshaft covers. Torque the bolts to 89 inch lbs. (10 Nm).
     
    Front engine cover. Torque the bolts to 89 inch lbs. (10 Nm).
     
    Accessory drive belt
     
    Drive belt pulley
     
    Drive belt tensioner
     
    Engine
     

  6.  
  7. Refill the cooling system.
  8.  
  9. Start the engine and check for leaks.
  10.  

Right Side Secondary Chain
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Exhaust Y-pipe at the converter
     
    Tower-to-tower brace
     
    Ignition Control Module (ICM) wiring connectors and mounting bolts
     
    ICM
     
    Spark plug wires on the right bank
     
    Positive Crankcase Ventilation (PCV) valve
     
    Canister purge solenoid from the rear of the cover
     
    Front cover
     
    Camshaft cover screws
     
    Right and left torque struts
     

  4.  
  5. Safely support the front of the engine cradle and remove the 2 mounting bolts at the front of the cradle.
  6.  
  7. Lower the engine cradle or raise the vehicle to provide clearance at the rear of the engine compartment.
    NOTE
    The camshaft cover gasket is reusable as long as it is not damaged.



    Camshaft cover
     



    Right side secondary chain tensioner
     
    Right side chain guide. Access the upper chain guide mounting bolt through the hole in the cylinder head capped with the plastic plug.
     
    Right side camshaft sprocket bolts and camshaft sprockets
     
    Secondary drive chain
     

  8.  

To install:

Click image to see an enlarged view

Fig. Rotating tensioner release lever

  1. Install the secondary timing chain over the outer row of teeth on the intermediate shaft sprocket. Route the chain over the chain guide and install the exhaust camshaft sprocket so the RE (Right Head Exhaust) pin engages the sprocket notch. There should be no slack in the lower section of the timing chain and the camshaft drive pin must be perpendicular to the cylinder head face.
    NOTE
    The Right Exhaust (RE) camshaft sprocket must contain the Camshaft Position (CMP) sensor pick-up.

  2.  
  3. Install the intake camshaft sprocket into the chain so the sprocket notch RI (Right Head Intake) engages the camshaft and the camshaft drive pin remains perpendicular to the cylinder head face. A hex is cast into the camshafts behind the lobes for cylinder No. 1, so an open end wrench may be used to provide minor repositioning of the camshafts.

    Click image to see an enlarged view

    Fig. Correct timing chain alignment

  4.  
  5. Install or connect the following:

    Both camshaft sprocket bolts loosely
     
    Chain tensioner. Torque the mounting bolts to 20 ft. lbs. (27 Nm).
     

  6.  
  7. Torque the camshaft sprocket bolts to 90 ft. lbs. (120 Nm).

    Spark plug and camshaft cover seals
     
    Camshaft cover. Torque the screws to 84 inch lbs. (10 Nm).
     
    Engine cradle. Torque both bolts to 75 ft. lbs. (100 Nm).
     

  8.  
  9. Install the right and left torque struts. Torque the retaining bolts to 45 ft. lbs. (60 Nm).
    NOTE
    It is important during installation that the engine torque struts are not preloaded in their installed position. Adjustment is provided at the point the strut fastens to the core support bracket. Be sure this bolt is loose during assembly.



    Front cover. Torque the bolts to 89 inch lbs. (10 Nm).
     
    Strut-to-core support bracket bolt. Torque it to 45 ft. lbs. (60 Nm).
     
    Canister purge solenoid to the rear of the cover
     
    PCV valve
     
    ICM and the wiring connectors
     
    Spark plug wires on the right-bank
     
    Tower-to-tower brace
     
    Exhaust Y-pipe to the converter. Torque the bolts to 20 ft. lbs. (27 Nm).
     
    Negative battery cable
     

  10.  
  11. Start the engine and check for leaks.
  12.  

 
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