Bonneville, LeSabre, Park Avenue 2000-2005

Timing Chain Cover, Chain, Sprockets, & Seal

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Removal & Installation



3.8L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Support the engine.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Torque axis mount and bracket
     
    Drive belt
     
    Supercharger belt, if equipped
     
    Drive belt idler pulley and bracket (VIN 1 engine)
     
    Drive belt tensioner (for VIN K engine)
     
    Crankshaft balancer
     
    Crankshaft Position (CKP) sensor shield and the CKP sensor
     
    Oil pan-to-front cover bolts
     
    Timing chain front cover

    Click image to see an enlarged view

    Fig. Timing chain front cover-3.8L (VIN K and 1) engines

     

  8.  
  9. Align the timing marks on the camshaft and crankshaft sprockets so they are as close together as possible.
    WARNING
    Do not rotate the camshaft or crankshaft while the timing chain and sprockets are removed.



    Timing chain damper
     
    Camshaft sprocket bolt, the camshaft sprocket and timing chain
     
    Crankshaft sprocket
     

  10.  

To install:

  1. Install or connect the following:
    WARNING
    The oil pump is built into the front cover. When the cover is removed, oil drains from the pump. Since the pump "loses its prime" it may not establish oil pressure as soon as the engine starts. Therefore, it is important to remove the oil pump cover from the back of the timing chain front cover and pack the space around the oil pump gears completely full of petroleum jelly. If this is not done, the oil pump may not pump engine oil when the engine is started, resulting in severe engine damage.



    Timing chain and sprockets with the timing marks aligned
     
    Camshaft sprocket bolt. Torque the bolt to 74 ft. lbs. (100 Nm) plus an additional 90 degree turn.
     



    Timing chain damper. Torque the bolts to 16 ft. lbs. (22 Nm).

    Click image to see an enlarged view

    Fig. Timing chain sprocket and balance shaft gear alignment-3.8L (VIN K and 1) engines

     

  2.  
  3. Remove the screws and the oil pump cover from the back of the timing chain front cover. Pack the space around the oil pump gears completely full of petroleum jelly. There must be no air space left inside the pump.
  4.  
  5. Install or connect the following:

    Pump cover with new gaskets. Torque the screws to 97 inch lbs. (11 Nm).
     
    Timing chain front cover. Torque the front cover-to-engine bolts to 11 ft. lbs. (15 Nm) plus an additional 40 degrees.
     
    Oil pan-to-front cover bolts. Torque the bolts to 125 inch lbs. (14 Nm).
     
    CKP sensor. Torque the bolts to 14-28 ft. lbs. (20-40 Nm).
     
    CKP sensor shield
     
    Crankshaft balancer. Torque the bolt to 111 ft. lbs. (150 Nm) plus an additional 76 degree turn.
     
    Drive belt tensioner assembly (VIN K engine)
     
    Drive belt idler pulley (VIN 1 engine)
     
    Right inner fender access panel and the right front wheel
     
    Drive belt(s)
     
    Engine mount
     
    Coolant hoses
     
    Negative battery cable
     

  6.  
  7. Remove the engine support fixture.
  8.  
  9. Refill and bleed the cooling system.
  10.  
  11. Start the vehicle and check for leaks and proper engine operation.
  12.  

4.6L Engine
  1. Remove the front cover perimeter bolts.
  2.  
  3. Remove the front cover and the gasket. Ensure that you do not damage the sealing surface.
    NOTE
    Do not remove the crankshaft front oil seal.

  4.  

The crankshaft front oil seal is not serviced as an individual component. When replacing the crankshaft front oil seal, install a NEW engine front cover. In order to precisely align the crankshaft front oil seal to the crankshaft balancer and crankshaft balancer dust shield, the engine front cover and the crankshaft front oil seal are sold as an assembly.

 
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