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    Chrysler Full-Size Trucks 1967-1988 Repair Guide

    Timing Chain and Sprockets

    Print

    REMOVAL & INSTALLATION



    Inline 6 Cylinder Gasoline Engines

    See Figure 1

    1. Remove the front cover.
    2.  
    3. Slide the crankshaft oil slinger off the front of the crankshaft.
    4.  

    It is a good practice to mark the timing marks with white paint before proceeding.

    1. Remove the camshaft sprocket bolt.
    2.  
    3. Remove the timing chain with the camshaft sprocket.
    4.  

    To install:
    1. Turn the crankshaft to line up the timing mark on the crankshaft sprocket with the centerline of the camshaft (without the chain).
    2.  



    Click image to see an enlarged view

    Fig. Fig. 1: 6-198 and 225 timing mark alignment

    1. Install the camshaft sprocket and chain. Align the timing marks which were painted earlier.
    2.  
    3. Torque the camshaft sprocket bolt to 35 ft. lbs. (47 Nm) for the 6-198 and 6-225; 20 ft. lbs. (27 Nm) for the 6-251.
    4.  
    5. Replace the oil slinger.
    6.  
    7. Install the timing case cover.
    8.  

    V6 and V8 Gasoline Engines

    See Figures 2 through 7

    1. Remove the front cover.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 2: Before loosening and removing the camshaft sprocket bolt, align the timing marks

    1. On 238, 318, 383, and 360 engines, remove the camshaft sprocket lock bolt, securing cup washer, and fuel pump eccentric. Remove the timing chain with both sprockets. On 400 and 440 engines, remove the camshaft sprocket lockbolt, then remove the timing chain with the camshaft and crankshaft sprockets.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 3: Slide the securing cup washer off after removing the camshaft sprocket bolt



    Click image to see an enlarged view

    Fig. Fig. 4: When removing and installing the chain make sure the timing marks are in alignment



    Click image to see an enlarged view

    Fig. Fig. 5: Remove the sprocket/chain assembly by hand; DO NOT use a pry tool as this may damage the sprockets

    1. Place the camshaft and crankshaft sprockets on a flat surface with the timing indicators on an imaginary centerline through both sprocket boxes.
    2.  

    To install:
    1. Place the timing chain around both sprockets. Be sure that the timing marks are in alignment.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 6: V-6 and V-8 timing mark alignment


    CAUTION
    When installing the timing chain, have an assistant support the camshaft with a suitable tool to prevent it from contacting the plug in the rear of the engine block. Remove the distributor and the oil pump/distributor drive gear. Position the suitable tool against the rear side of the cam gear and be careful not to damage the cam lobes.

    1. Turn the crankshaft and camshaft to align them with the keyway location in the crankshaft sprocket and the keyway or dowel hole in the camshaft sprocket.
    2.  
    3. Lift the sprockets and timing chain while keeping the sprockets tight against the chain in the correct position. Slide both sprockets evenly onto their respective shafts.
    4.  
    5. Use a straightedge to measure the alignment of the sprocket timing marks. They must be perfectly aligned.
    6.  
    7. On 238, 318 and 360 engines, install the fuel pump eccentric, cup washer, and camshaft sprocket lockbolt and torque to 35 ft. lbs. (47 Nm) If camshaft end-play exceeds 0.010 in. (0.25mm), install a new thrust plate. It should be 0.002-0.006 in. (0.05-0.15mm) with the new plate.
    8.  
    9. On 400 and 440 engines, install the washer and camshaft sprocket lockbolt(s) and then torque the lockbolt to 35-40 ft. lbs. (47-54 Nm). Check to make sure that the rear face of the camshaft sprocket is flush with the camshaft end.
    10.  



    Click image to see an enlarged view

    Fig. Fig. 7: ALWAYS double check timing mark alignment before installing the timing cover

    CHECKING TIMING CHAIN SLACK



    See Figures 8 and 9

    1. Position a scale (ruler or straightedge) next to the timing chain to detect any movement in the chain.
    2.  



    Click image to see an enlarged view

    Fig. Fig. 8: Measuring the timing chain wear and stretch on V6-238 and V8-318/360-If wear exceeds 1/8 in. (3.175mm) install a new chain.



    Click image to see an enlarged view

    Fig. Fig. 9: Measuring the timing chain wear and stretch on L6-198 and L6-225-If wear exceeds 1/8 in. (3.175mm) install a new chain.

    1. Place a torque wrench and socket on the camshaft sprocket attaching bolt. Apply either 30 ft. lbs. (41 Nm), if the cylinder heads are installed on the engine, or 15 ft. lbs. (20 Nm), cylinder heads removed, of force to the bolt and rotate the bolt in the direction of crankshaft rotation in order to remove all slack from the chain.
    2.  
    3. While applying torque to the camshaft sprocket bolt, the crankshaft should not be allowed to rotate. It may be necessary to block the crankshaft to prevent rotation.
    4.  
    5. Position the scale over the edge of a timing chain link and apply an equal amount of torque in the opposite direction. If the movement of the chain exceeds 1 / 8 in. (25.5mm), replace the chain.
    6.  

     
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