Pacifica, 2003-2005

Rocker Arms & Shafts

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Removal & Installation



3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Relieve the fuel system pressure.
  4.  
  5. Remove or disconnect the following:
    NOTE
    Cover the lower intake manifold during service.



    Negative battery cable
     
    Air cleaner assembly and the intake manifold plenum
     



    Cylinder head covers
     
    Rocker arm assembly

    Click image to see an enlarged view

    Fig. Left bank rocker arm and shaft identification-3.5L engine

    Left bank rocker arm and shaft identification-3.5L engine
     

  6.  
  7. Inspect the rocker arms for wear or damage. Inspect the roller for scuffing or wear. Replace assembly as necessary.
    WARNING
    Do not remove the lash adjusters from the rocker arm assembly. The rocker arm and the adjuster are serviced as an assembly.

  8.  
  9. Identify the rocker arm assemblies and rocker arms and disassemble the shaft as follows:
    1. Thread a nut, washer and spacer onto a 4mm screw.
    2.  
    3. Insert and tighten the 4mm screw into the dowel pin on the shaft.
    4.  
    5. Loosen the nut on the screw. This will pull the dowel pin from the shaft support.
    6.  
    7. Remove the rocker arms and pedestals, keeping them in order.
    8.  
    9. Check the oil holes for restrictions with a small wire and clean as required.

      Click image to see an enlarged view

      Fig. Remove the dowel pin using a 4mm screw, nut, spacer and washer installed into the pin-3.5L engine

      Remove the dowel pin using a 4mm screw, nut, spacer and washer installed into the pin-3.5L engine
    10.  

  10.  

To install:

  1. Assemble the rocker shaft as follows:
    1. Install the rocker arms and pedestals onto the shaft, keeping them in the original order.
    2.  
    3. Press the dowel pins into the pedestals until they bottom out in the pedestals.
    4.  

  2.  
  3. Position the camshaft so that the timing mark on the right camshaft timing belt sprocket aligns with the timing mark on the rear timing belt cover and the timing mark on the left sprocket is 45 degrees from the mark on the rear timing belt cover. There will be no load on the shaft during installation. Install the rocker shafts so the identification marks are facing toward the front of the engine.
  4.  
  5. Install the oil feed bolt in the correct location on the rocker shaft retainer. Torque the bolts in proper sequence to 23 ft. lbs. (31 Nm).

    Click image to see an enlarged view

    Fig. Proper torque sequence for the rocker arm and shaft assemblies-3.5L engine

    Proper torque sequence for the rocker arm and shaft assemblies-3.5L engine
  6.  
  7. Install or connect the following:

    Valve covers and torque the bolts to 105 inch lbs. (12 Nm)
     
    Intake manifold plenum
     
    Air cleaner assembly
     
    Negative battery cable
     

  8.  

 
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