Chrysler Full-Size Vans 1967-1988 Repair Guide

Timing Chain

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REMOVAL & INSTALLATION



See Figure 1



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Fig. Fig. 1: After removing the old seal, use a large socket and a hammer to install the new seal

Inline 6-Cylinder Engines
  1. Remove the front cover.
  2.  
  3. Slide the crankshaft oil slinger off the front of the crankshaft.
  4.  
  5. Remove the camshaft sprocket bolt.
  6.  
  7. Remove the timing chain with the camshaft sprocket.
  8.  

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.  
  3. Install the camshaft sprocket and chain. Align the timing marks.
  4.  
  5. Torque the camshaft sprocket bolt to 35 ft. lbs.
  6.  
  7. Replace the oil slinger.
  8.  
  9. Install the timing case cover.
  10.  

V6 and V8 Engines

See Figures 2 through 11



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Fig. Fig. 2: Timing mark alignment on inline 6-cylinder engines



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Fig. Fig. 3: Before removing the timing chain assembly, align the timing marks on the gears (arrows)



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Fig. Fig. 4: Loosen and remove the camshaft sprocket bolt ...



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Fig. Fig. 5: ... then remove the timing chain assembly



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Fig. Fig. 6: Timing mark alignment on V8 engines



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Fig. Fig. 7: Once the timing cover is removed on V8 engines, remove the upper timing gear retaining bolt ...



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Fig. Fig. 8: ... and the fuel pump eccentric



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Fig. Fig. 9: Remove the chain assembly by hand; DO NOT use a pry tool as you can damage the assembly



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Fig. Fig. 10: When removing and installing the chain, make sure the timing marks are in alignment



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Fig. Fig. 11: Always double check timing mark alignment before installing the cover

  1. Remove the front cover.
  2.  
  3. On 318 and 360 engines, remove the cam shaft sprocket lockbolt, securing cup washer, and fuel pump eccentric. Remove the timing chain with both sprockets. On 400 and 440 engines, remove the camshaft sprocket lockbolt and remove the timing chain with the camshaft and crankshaft sprockets.
  4.  
  5. To begin the installation procedure, place the camshaft and crankshaft sprockets on a flat surface with the timing indicators on an imaginary centerline through both sprocket boxes. Place the timing chain around both sprockets. Be sure that the timing marks are in alignment.
  6.  


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 318 and 360 engines, install the fuel pump eccentric, cup washer, and camshaft sprocket lockbolt and torque to 35 ft. lbs. If camshaft end-play exceeds 0.010", install a new thrust plate. It should be 0.002-0.006" with the new plate.
  8.  

On 400 and 440 engines, install the washer and camshaft sprocket lockbolt(s) and then torque the lockbolt to 35-40 ft. lbs. Check to make sure that the rear face of the camshaft sprocket is flush with the camshaft end.

CHECKING TIMING CHAIN SLACK



See Figures 12, 13 and 14



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Fig. Fig. 12: Measuring the timing chain slack on inline 6-cylinder engines



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Fig. Fig. 13: Measuring the timing chain slack on V6 and V8 engines



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Fig. Fig. 14: Measure the timing chain wear on V6 and V8 engines-if wear exceeds 1/8 in. replace the chain

  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 either 30 ft. lbs. (if the cylinder heads are installed on the engine) or 15 ft. lbs. (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.
  4.  
  5. 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.
  6.  
  7. 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 ", replace the chain.
  8.  

 
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