Chrysler Full-Size Vans 1989-1998 Repair Guide

Timing Chain and Sprockets

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REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Raise and support the vehicle.
  4.  
  5. Remove the timing chain cover.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: View of the timing chain and sprockets, with the cover removed

  1. Rotate the engine until No. 1 cylinder is at Top Dead Center (TDC) on its compression stroke.
  2.  
  3. Remove the camshaft sprocket attaching bolt and cup washer.
  4.  
  5. Remove the timing chain with both the camshaft and crankshaft sprockets.
  6.  

To install:
  1. Place the camshaft and crankshaft sprockets on a flat surface with the timing indicator marks on an imaginary centerline through both sprocket bosses.
  2.  
  3. Place the timing chain around both sprockets. Be sure that the timing marks are in alignment.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Be sure to maintain proper alignment of the timing marks

  1. If necessary, 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. Install the cup washer and camshaft sprocket bolt. Tighten to 35 ft. lbs. (47 Nm).
  8.  
  9. If camshaft end-play exceeds 0.010 in., install a new thrust plate. It should be 0.002-0.006 in. with the new plate.
  10.  
  11. Install the timing chain cover.
  12.  
  13. Lower the vehicle.
  14.  
  15. Connect the negative battery cable.
  16.  

INSPECTION



Timing Chain Slack

See Figure 3

  1. Position a scale (ruler or straightedge) next to the timing chain to detect any movement in the chain.
  2.  
  3. Place a torque wrench and socket on the camshaft sprocket attaching bolt. Apply 30 ft. lbs. (41 Nm) of torque if the cylinder heads are installed on the engine, or 15 ft. lbs. (20 Nm) if the cylinder heads are removed, and rotate the bolt in the direction of crankshaft rotation in order to remove all slack from the chain.
  4.  



Click image to see an enlarged view

Fig. Fig. 3: Measuring timing chain slack with a torque wrench and ruler

  1. 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.
  2.  
  3. 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. (3.175mm), replace the chain.
  4.  

 
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