Chrysler Front Wheel Drive Cars 6-CYL 1988-1995 Repair Information

Timing Chains and Sprockets

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REMOVAL & INSTALLATION



Premier and Monaco

See Figures 1 through 21

When removing the timing chains, tensioners, guides, sprockets and tensioner shoes, keep the left and right-hand side separated and do not mix them.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing chain cover by following the preceding procedures in this section.
  4.  
  5. Rotate the crankshaft until the crankshaft key is pointing up.
  6.  
  7. Remove the oil pump sprocket mounting bolts. Note that they have thread lock sealant applied to them.
  8.  



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Fig. Fig. 1: Oil pump sprocket and chain-Premier and Monaco



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Fig. Fig. 2: When the chain is pulled up a gap will form under it-Premier and Monaco



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Fig. Fig. 3: Use the drill bit as a gauge-Premier and Monaco



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Fig. Fig. 4: Timing chains, sprockets and tensioners-Premier and Monaco

  1. Clean the threads of the bolts.
  2.  
  3. Remove the attaching the right-hand side camshaft sprocket to the camshaft.
  4.  
  5. Lock the timing chain tensioner by rotating the slotted lock finger counterclockwise with a thin screwdriver.
  6.  
  7. Remove the right-hand side timing chain tensioner and let the tensioner shoe hang down.
  8.  


WARNING
The timing chain tensioner lock must be set in the locked position before removing the tensioner. To lock the tensioner, rotate the slotted lock finger counterclockwise with a thin screwdriver.

  1. Remove the right-hand side timing chain.
  2.  
  3. Remove the right-hand side camshaft sprocket.
  4.  
  5. Remove the right-hand side timing chain guide.
  6.  
  7. Remove the right-hand side tensioner shoe.
  8.  
  9. Keep the right-hand side components together in a group separate from the left-hand side components.
  10.  



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Fig. Fig. 5: The tensioner filter locations-Premier and Monaco



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Fig. Fig. 6: Chain guide and tensioner shoe positions-Premier and Monaco



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Fig. Fig. 7: Make certain to turn the crankshaft so that the keyway is facing up-Premier and Monaco



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Fig. Fig. 8: Situate the left camshaft so that the groove is in the position shown-Premier and Monaco

  1. Remove the left-hand side timing chain tensioner.
  2.  


WARNING
The timing chain tensioner lock must be set in the locked position before removing the tensioner. To lock the tensioner, rotate the slotted lock finger counterclockwise with a thin screwdriver.

  1. Remove the left-hand side timing chain.
  2.  
  3. Remove the left-hand side camshaft sprocket.
  4.  
  5. Remove the left-hand side timing chain guide.
  6.  
  7. Remove the left-hand side tensioner shoe.
  8.  
  9. Remove the tensioner filters from the engine block.
  10.  



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Fig. Fig. 9: Turn the right camshaft so that the groove is in the position shown-Premier and Monaco



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Fig. Fig. 10: Left camshaft crankshaft key way alignment-Premier and Monaco



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Fig. Fig. 11: Left camshaft sprocket-to-timing chain alignment-Premier and Monaco



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Fig. Fig. 12: Crankshaft sprocket-to-left camshaft chain alignment-Premier and Monaco

To install:

The timing chains are identical and when NEW can be used with either camshaft sprocket. Used chains MUST be installed on the same side they were removed from.

The camshaft sprockets are not identical. The right camshaft sprocket has a spacer attached to it. The left camshaft sprocket does not have a spacer.

The timing chain tensioners, shoes and guides are identical and when NEW can be used on either timing chain. Used tensioners, shoes and guides MUST be installed on the same side from which they were removed.

When installing the timing chains and sprockets, the left bank of the engine must be timed first.

  1. Install the chain guides and tighten the bolts to 53 inch lbs. (6 Nm).
  2.  
  3. Install the tensioner shoes and tighten their bolts to 9 ft. lbs. (12 Nm).
  4.  
  5. Turn the crankshaft so that the keyway points straight up.
  6.  
  7. Turn the left camshaft until the slot in the front is positioned as shown in the illustration.
  8.  
  9. Turn the right camshaft until the slot in the front is positioned as shown in the illustration.
  10.  
  11. Install the new or cleaned tension filters.
  12.  
  13. To install the left timing chain, turn the crankshaft clockwise until the crankshaft keyway is aligned with the centerline of the left cylinder bank.
  14.  



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Fig. Fig. 13: Tensioner lock-Premier and Monaco



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Fig. Fig. 14: Left timing chain tensioner and ratchet-Premier and Monaco



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Fig. Fig. 15: Crankshaft alignment for installation of the right camshaft chain-Premier and Monaco



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Fig. Fig. 16: Right camshaft sprocket-to-timing chain alignment-Premier and Monaco

The crankshaft has three separate sprockets. One sprocket is for the left timing chain, one is for the right timing chain, one is for the oil pump chain.

  1. The left camshaft sprocket does not have a built-in spacer. Install the left timing chain so that the unpainted link between the two painted links is aligned with the stamped timing mark on the left camshaft sprocket.
  2.  
  3. The timing mark is located on the middle (or second) sprocket which is for the RIGHT timing chain. Install the left timing chain by positioning the single painted link of the LEFT timing chain onto the tooth of the rear sprocket. That tooth is directly behind the tooth of the middle sprocket that has the timing mark.
  4.  


WARNING
The timing chain tensioner lock should not be removed. The lock is held in place by a spring that pushes a steel ball against the lock finger.

If the lock is removed accidentally, replace the tensioner assembly because there is no way of checking the position of the lock finger in relation to the steel ball.

  1. To install the left timing chain tensioner use a thin blade screwdriver to turn the ratchet counterclockwise. Then push the tensioner arm in. Position the tensioner over the filter and the tensioner shoe into the arm.
  2.  
  3. Tighten the mounting bolts to 53 inch lbs. (6 Nm).
  4.  



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Fig. Fig. 17: Crankshaft-to-right timing chain alignment-Premier and Monaco



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Fig. Fig. 18: Right timing chain tensioner-Premier and Monaco



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Fig. Fig. 19: Tensioner lock ratchet-Premier and Monaco

  1. To install the right timing chain, rotate the crankshaft approximately 150° until the timing mark on the crankshaft middle sprocket is aligned with the lower oil pump cover mounting bolt.
  2.  
  3. The right camshaft sprocket has a built-in spacer. Install the right timing chain so that the unpainted link between the two painted links is aligned with the stamped timing mark on the right camshaft sprocket.
  4.  
  5. The single painted link on the bottom of the timing chain is aligned with the timing mark on the middle sprocket.
  6.  


WARNING
The timing chain tensioner lock should not be removed. The lock is held in place by a spring that pushes a steel ball against the lock finger. If the lock is removed accidentally, replace the tensioner assembly because there is no way of checking the position of the lock finger in relation to the steel ball.

  1. To install the left timing chain tensioner use a thin blade screwdriver to turn the ratchet counterclockwise. Then push the tensioner arm in. Position the tensioner over the filter and the tensioner shoe into the arm.
  2.  
  3. Tighten the mounting bolts to 53 inch lbs. (6 Nm).
  4.  
  5. Install the right camshaft sprocket bolt and tighten the bolt to 59 ft. lbs. (80 Nm).
  6.  
  7. Push both tensioner shoes in to release the ratchet of the tensioner from the locked position and then let the shoes out.
  8.  



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Fig. Fig. 20: Right camshaft/crankshaft timing mark alignment-Premier and Monaco



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Fig. Fig. 21: Left camshaft/crankshaft timing mark alignment-Premier and Monaco

  1. Install the oil pump sprocket and chain. Coat the threads of the three mounting bolts with Loctite 271® and tighten the bolts to 53 inch lbs. (6 Nm).
  2.  
  3. Check the valve timing with the following procedure:
    1. Once the crankshaft is rotated, the paint marks on the timing chains will not align with the marks on the sprockets. When checking valve timing, it is the position of the timing marks in relation to one another that is checked, NOT the position of the paint marks on the chains.
    2.  
    3. Rotate the crankshaft 180°. Check that the right camshaft sprocket timing mark and the crankshaft timing mark are aligned as shown in the illustration.
    4.  
    5. Rotate the crankshaft another 90°. The left camshaft sprocket timing mark and the crankshaft sprocket timing mark should be aligned as shown in the illustration.
    6.  
    7. If the timing marks do not line up, remove the chains and reinstall.
    8.  

  4.  
  5. Install the timing chain cover by adhering to the procedures in this section.
  6.  
  7. Connect the negative battery cable.
  8.  

3.3L and 3.8L Engines

See Figures 22 and 23

  1. Disconnect the negative battery cable.
  2.  
  3. Follow the procedure for the timing chain cover removal found earlier in this section.
  4.  
  5. Measure the timing chain for stretch as follows:
    1. Place a ruler next to the timing chain so that any movement of the chain may be measured.
    2.  
    3. Place a torque wrench and socket on the camshaft sprocket attaching bolt and apply torque in the direction of crankshaft rotation to take up any slack; 30 ft. lbs. (41 Nm) with the cylinder head installed or 15 ft. lbs. (20 Nm) with the cylinder heads removed.
    4.  

  6.  

With a torque applied to the camshaft sprocket bolt, the crankshaft should not be permitted to move. It may be necessary to block the crankshaft to prevent rotation.

  1. Holding the scale or ruler even, with the dimension reading as shown, along the edge of the chain links. Apply torque in the reverse direction to 30 ft. lbs. (41 Nm) with the cylinder heads installed, or 15 ft. lbs. (20 Nm) with the cylinder heads removed. Check the amount of chain movement.
  2.  
  3. Install a new timing chain if the movement exceeds 1 / 8 in. (3.175mm).
  4.  

  1. If the chain is found to be out of specification, remove the camshaft sprocket attaching bolt, and remove the timing chain with the camshaft sprocket.
  2.  
  3. Using a gear puller, remove the crankshaft sprocket. Be careful not to damage the crankshaft surface.
  4.  



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Fig. Fig. 22: Measuring the timing chain wear and stretch-3.3L and 3.8L engines



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Fig. Fig. 23: After installing the timing chain make certain that the timing marks line up-3.3L and 3.8L engines

To install:
  1. Position a new crankshaft sprocket onto the shaft, then install the sprocket with a suitably-sized socket and a rubber or plastic mallet. Be sure that the sprocket is seated in position.
  2.  
  3. Rotate the crankshaft, if needed, until the timing mark is in the 12 o'clock position.
  4.  
  5. Situate the timing chain on the camshaft sprocket and hold the camshaft sprocket so that the timing mark is in the 6 o'clock position.
  6.  
  7. Align the dark colored links with the dot on the camshaft sprocket, place the timing chain around the crankshaft sprocket with the dark colored link lined up with the dot on the sprocket and install the camshaft sprocket onto the end of the camshaft.
  8.  
  9. Using a straightedge, check the alignment of the crankshaft and camshaft timing marks.
  10.  
  11. Install the camshaft bolt and washer. Tighten the bolt to 40 ft. lbs. (54 Nm).
  12.  
  13. Rotate the crankshaft 2 full revolutions. The timing marks should line up. If the timing marks do not line up, remove the camshaft sprocket and realign it.
  14.  
  15. Check the camshaft end-play. With a new thrust plate the specification is 0.005-0.012 in. (0.0127-0.304mm). The old thrust plate specification is 0.012 in. (0.31mm) maximum. If not within these limits install a new thrust plate.
  16.  
  17. Install the timing chain snubbers. Tighten the retaining screws to 9 ft. lbs. (12 Nm). Each model year of these engines may use different length bolts, therefore do not use bolts for this component from any other model year engine.
  18.  
  19. Install the timing chain cover by using the previous procedures.
  20.  
  21. Connect the negative battery cable.
  22.  

INSPECTION



Premier and Monaco

Check the timing chain and sprocket for wear. If either side has excessive wear, replace the timing chains, sprockets, guide shoes and tensions for both sides with new components.

  1. Remove the rocker arm covers.
  2.  
  3. Pull on the top of the timing chains. This will produce a gap between the bottom of the timing chain and the bottom of the area between the two sprocket teeth.
  4.  
  5. A maximum clearance (gap) of 0.067 in. (1.7mm) between the timing chain and sprocket must not be exceeded. A gap of 0.067 in. (1.7mm) corresponds to a travel of 0.866 in. (22mm) by the timing chain tensioner plunger.
  6.  
  7. Use the solid end of a number 51 drill bit to gauge the size of the gap.
  8.  
  9. If the solid end of the drill bit fits into the gap between the timing chain and the two sprocket teeth, then the following components MUST be replaced:

    Timing chain shoes
     
    Tensioners
     
    Guides
     
    Sprockets
     
    Tensioner shoes
     

  10.  
  11. If the solid end of the drill bit does not fit into the gap, the wear is not excessive and the components can be reused.
  12.  

 
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