Pickup 1997

Rocker Arms

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    If working near and/or around the SRS system and components, be sure to disable the SRS system. After disabling the system wait three minutes or more before servicing the vehicle. Disconnect the air bag module connector.



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    Fig. Air bag module connector location

  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the air cleaner assembly.

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    Fig. Air cleaner assembly and related components

  6.  
  7. Remove the valve cover. The rocker shaft assembly can be removed by simply removing its retaining bolts.
  8.  

When removing the bolts, loosen them in two or three stages, from the outside to the inside, in the proper sequence.

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Fig. Rocker shaft assembly loosening sequence



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Fig. Rocker shaft identification



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Fig. Rocker arm retainer positioning

  1. Remove the rocker shaft retainers, then slide the valve rockers and springs off of the rocker shaft. Be absolutely sure to keep all parts in the order in which they were removed; they must be reassembled in the same position and location.
  2.  
  3. Inspect the rocker arms and shaft for damage; and replace as necessary.

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    Fig. Valve rocker arms and related components

  4.  

To install:


NOTE
Be sure to use new fasteners, as required.

  1. Slide the springs and rockers onto the shafts in the order that they were removed.
  2.  
  3. Install the rocker retainers so that the cutouts are facing in the direction shown in the illustration.
  4.  
  5. The intake rocker shaft has a single punch mark on its leading edge, but the exhaust shaft has two punch marks. The shafts should be assembled with these marks facing upward, as they are used for oil hole identification.
  6.  
  7. The rocker shaft brackets are also marked as to their original location; simply match them to the like marks on the cylinder head.
  8.  
  9. Mount the rocker shaft assembly on the cylinder head in a manner that accommodates the camshaft knock pin, then tighten the retaining bolts gradually, in two or three stages to specification. Follow the tightening sequence shown in the illustration.

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    Fig. Rocker shaft assembly torque sequence

  10.  
  11. Continue the installation in the reverse order of the removal procedure.
  12.  
  13. Using the CONSULT-III diagnostic tool, or equivalent, perform the SRS self diagnostic test and any reconnect/relearn procedures, as required.
  14.  

 
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