Jeep Wagoneer/Commando/Cherokee 1984-1998

Timing Chain and Gears

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Removal & Installation



2.5L Engine

See Figures 1 and 2

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the fan and shroud, the accessory drive belts, vibration damper and pulley.
  4.  
  5. Remove the timing case cover.
  6.  
  7. Rotate the crankshaft so that the timing marks on the cam and crank sprockets align next to each other.
  8.  
  9. Remove the oil slinger from the crankshaft.
  10.  
  11. Remove the cam sprocket retaining bolt and remove the sprocket and chain. The crank sprocket may also be removed at this time. If the tensioner is to be removed, the oil pan must be removed first.
  12.  



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Fig. Fig. 1: Timing chain tensioner

To install:
  1. Prior to installation, turn the tensioner lever to the unlock (down) position.
  2.  
  3. Pull the tensioner block toward the tensioner to compress the spring. Hold the block and turn the tensioner lever to the lock (up) position.
  4.  



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Fig. Fig. 2: 2.5L timing mark alignment

  1. Install the camshaft/crankshaft sprocket and timing chain together, as a unit. Ensure timing marks are aligned properly. The camshaft sprocket bolt should be tightened to 50 ft. lbs. (68 Nm) on 1984-88 models or 80 ft. lbs. (108 Nm) on 1989-98 models.
  2.  
  3. Install all other components in the reverse order of removal.
  4.  

2.8L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing cover.
  4.  
  5. Turn the crankshaft to bring the No. 1 piston to TDC of its compression stroke. The timing marks on the crankshaft and camshaft sprockets should be aligned as shown with the No. 4 cylinder in firing position.
  6.  
  7. Remove the camshaft sprocket and chain. If the sprocket is stuck, you can remove it by tapping it lightly with a plastic or wood mallet.
  8.  
  9. Lubricate the chain and sprockets with Molykote®, or equivalent. Install the cam sprocket and chain, with the timing marks aligned and the dowel in the camshaft aligned with the hole in the sprocket.
  10.  
  11. Install the sprocket on the camshaft and tighten the cam sprocket bolts to 20 ft. lbs. (27 Nm).
  12.  
  13. Install the timing cover. Reconnect the negative battery cable.
  14.  

4.0L Engine

See Figures 3, 4, 5, 6, 7 and 8

  1. Remove the drive belts, engine fan and hub assembly, accessory pulley, vibration damper and timing chain cover.
  2.  
  3. Remove the tension spring and thrust pin from the preload bolt, if equipped.
  4.  
  5. Remove the oil seal from the timing chain cover.
  6.  



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Fig. Fig. 3: Remove the oil deflector

  1. Remove the camshaft sprocket retaining bolt and washer.
  2.  



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Fig. Fig. 4: Remove the camshaft retaining bolt and washer



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Fig. Fig. 5: Be careful not to lose the thrust pin and spring

  1. Rotate the crankshaft until the timing mark on the crankshaft sprocket is closest to and in a center line with the timing pointer of the camshaft sprocket.
  2.  
  3. Remove the camshaft sprocket and timing chain as an assembly. Disassemble the chain and sprockets. If necessary, remove the crankshaft sprocket.
  4.  



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Fig. Fig. 6: Remove the camshaft sprocket and chain



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Fig. Fig. 7: It may be necessary to use a puller to extract the crankshaft sprocket

To install:
  1. Assemble the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks aligned.
  2.  
  3. Install the assembly to the crankshaft and the camshaft. Install the camshaft sprocket retaining bolt and washer and tighten to 80 ft. lbs. (108 Nm).
  4.  
  5. Check the alignment of the chain and sprockets by counting the number of links or pins with the sprockets positioned as illustrated. There must be 15 pins between the marks on the sprockets.
  6.  



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Fig. Fig. 8: There must be 15 pins between the marks of the sprockets

  1. Lubricate the tension spring, thrust pin and pin bore with MOPAR engine oil supplement, or equivalent, and install.
  2.  
  3. Install the timing chain cover and a new oil seal.
  4.  
  5. Install the vibration damper, accessory pulley, engine fan and hub assembly and drive belts.
  6.  

5.2L and 5.9L Engines

See Figures 9 and 10

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the timing chain cover.
  4.  
  5. Place a scale next to the timing chain so any movement of the chain can be measured.
  6.  
  7. Place a torque wrench and socket over the camshaft sprocket attaching bolt. Apply 30 ft. lbs. (41 Nm) with the cylinder heads installed or 15 ft. lbs. (20 Nm) with the cylinder heads removed.
  8.  

With the torque applied the crankshaft sprocket should not be permitted to move, but it may be necessary to block the crankshaft to prevent rotation.

  1. Hold the scale with the dimension reading even with the edge of a chain link. Apply 30 ft. lbs. (41 Nm) with the cylinder heads installed or 15 ft. lbs. (20 Nm) with the cylinder heads removed, in the reverse direction. Note the amount of chain movement.
  2.  
  3. Install a new timing chain if the movement exceeds 1 / 8 inch (3.175mm).
  4.  



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Fig. Fig. 9: Measuring the timing chain deflection

  1. Remove the camshaft sprocket retaining bolt.
  2.  
  3. Remove the timing chain and sprockets.
  4.  

To install:
  1. Position the camshaft and crankshaft sprockets on a bench with the timing marks facing each other.
  2.  
  3. Position the timing chain onto the sprockets.
  4.  
  5. Turn the crankshaft and camshaft to align with the keyway location in the crankshaft and camshaft sprockets.
  6.  



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Fig. Fig. 10: Aligning the sprocket marks

  1. Keeping tension on the chain, slide the sprocket and chain assembly onto the engine.
  2.  
  3. Ensure the timing marks are still aligned by using a straightedge.
  4.  
  5. Install the camshaft bolt and tighten it to 50 ft. lbs. (68 Nm).
  6.  
  7. Install the timing chain cover.
  8.  
  9. Connect the negative battery cable.
  10.  

 
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