Pickup 1997

Timing Chain & Sprockets

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Removal & Installation



Position the No. 1 piston at TDC on the compression stroke.

  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

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  3. Disconnect the negative battery cable.
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  5. Disconnect the negative battery cable.
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  7. Remove the timing chain cover.

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    Fig. Removing the crankshaft pulley



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    Fig. Removing the front cover



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    Fig. Valve cover and related components

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  9. Remove the valve cover.
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  11. With the No. 1 piston at TDC, the timing marks on the camshaft sprocket and the timing chain should be visible. Mark both of them with paint. Also mark the relationship of the camshaft sprocket to the camshaft. There are three sets of timing marks and locating holes in the sprocket; they are for making adjustments to compensate for timing chain stretch.
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  13. With the timing marks on the camshaft sprocket clearly indicated, locate and label (for easier reference) the timing marks on the crankshaft sprocket. Also label the chain timing mark. Of course, if the chain is not to be reused, marking it is useless.
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  15. Unbolt and remove the sprocket, along with the chain. As you remove the chain, hold it where the chain tensioner contacts it. When the chain is removed, the tensioner is going to come apart. Hold on to it and you won't lose any of the parts. The crankshaft sprocket can be removed with a puller, if necessary. There is no need to remove the chain guide unless it is being replaced.

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    Fig. Timing chain removal



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    Fig. Timing chain and related components

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To install:


NOTE
Be sure to use new fasteners, as required.

  1. Install the timing chain and camshaft sprocket together after first positioning the chain over the crankshaft sprocket. Position the sprocket so that the marks made previously line up. (This is assuming that the engine has not been disturbed.) The camshaft and crankshaft keys should both be pointing upward. If a new chain and/or gear is being installed, position the sprocket so that the timing marks on the chain align with the marks on the sprocket (with both keys pointing up). The marks are on the right-hand side of the sprockets as you face the engine.
    NOTE
    This engine does not use the pin counting method for finding correct valve timing. Instead, set the timing chain by aligning its mating marks with those of the crankshaft sprocket and camshaft sprocket. The camshaft sprocket should be installed by fitting the knock pin of the camshaft into its No. 2 hole.



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    Fig. Crankshaft sprocket installation



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    Fig. Timing chain installation and alignment



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    Fig. Install the chain guide and chain tensioner



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    Fig. Don't forget the oil seals

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  3. Install the camshaft sprocket bolt and tighten it to specification.
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  5. Install the chain guide and tensioner. Adjust the protrusion of the chain tensioner spindle to zero clearance. Tighten the bolts to specification.
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  7. With a new seal installed in the timing chain cover and a light coat of oil applied to the seal, install the cover.
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  9. Continue the installation in the reverse order of the removal procedure.
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  11. Check all fluids and add, as necessary.
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  13. Start the engine and check for any leaks. Check the ignition timing.
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  15. Using the CONSULT-III diagnostic tool, or equivalent, perform the SRS self diagnostic test and any reconnect/relearn procedures, as required.
  16.  

 
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