Jeep Wagoneer/Commando/Cherokee 1957-1983 Repair Information

Timing Chain and Gears

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REMOVAL & INSTALLATION 6-225 Engine



  1. Remove the timing chain cover.
  2.  
  3. Make sure that the timing marks on the crankshaft and the camshaft sprockets are aligned. This will make installing the parts easier.
  4.  

It is not necessary to remove the timing chain dampers (tensioners) unless they are worn or damaged and require replacement.

  1. Remove the front crankshaft oil slinger.
  2.  
  3. Remove the bolt and the special washer that hold the camshaft distributor drive gear and fuel pump eccentric at the forward end of the camshaft. Remove the eccentric and the gear from the camshaft.
  4.  
  5. Alternately pry forward the camshaft sprocket and then the crankshaft sprocket until the camshaft sprocket is pried from the camshaft.
  6.  
  7. Remove the camshaft sprocket, sprocket key, and the timing chain from the engine.
  8.  
  9. Pry the crankshaft sprocket from the crankshaft.
  10.  
  11. If the engine has not been disturbed, proceed to Step 4 for installation procedures.
  12.  
  13. If the engine has been disturbed, turn the crankshaft so that No. 1 piston is at top dead center of the compression stroke.
  14.  
  15. Temporarily install the sprocket key and the camshaft sprocket on the camshaft. Turn the camshaft so that the index mark of the sprocket is downward. Remove the key and sprocket from the camshaft.
  16.  
  17. Assemble the timing chain and sprockets. Install the keys, sprockets, and chain assembly on the camshaft and crankshaft so that the index marks of both the sprockets are aligned.
  18.  

It will be necessary to hold the spring-loaded timing chain damper out of the way while installing the timing chain and sprocket assembly.

  1. Install the front oil slinger on the crankshaft with the inside diameter against the sprocket (concave side toward the front of the engine).
  2.  
  3. Install the fuel pump eccentric on the camshaft and the key, with the oil groove of the eccentric forward.
  4.  
  5. Install the distributor drive gear on the camshaft. Secure the gear and eccentric to the camshaft with the retaining washer and bolt.
  6.  
  7. Torque the bolt to 40-55 ft. lb.
  8.  

6-226 Engine

  1. Remove the timing chain cover.
  2.  
  3. Before removing the parts, check for timing chain stretch. Press inward on the chain at a point midway between the gears. If the chain deflects more than 1 / 2 inch, it is overly stretched and must be discarded.
  4.  
  5. Bend up the locktabs and the camshaft gear retaining bolt and remove the bolt.
  6.  
  7. Pry, alternately, behind each gear until both are free.
  8.  
  9. Inspect both gears. If either appears to be excessively worn, or if either are chipped or cracked, both gears and the chain must be replaced. If only the chain is defective, then, only the chain needs replacement. Inspect the cover. If it is bent or damaged, replace it.
  10.  
  11. Place the two gears into the chain so that there are exactly nine links, or ten pins, between the timing marks on the gears.
  12.  
  13. If either the camshaft or crankshaft was rotated while the gears were off, position the shafts so that the keways are positioned as illustrated.
  14.  
  15. Slide the gears onto the shafts. If everything is aligned properly, the gears should slip into place with finger pressure.
  16.  
  17. If the camshaft has to be tapped into place, check that the camshaft bearing journals are not contacting the sides of nos. 1, 5, or 9 tappets. This sometimes occurs when the camshaft is pushed backwards during gear installation. If this does occur, hold the camshaft forward to prevent tappet damage.
  18.  
  19. When the gears are fully seated, place the lockplate on the camshaft, with the tab in the hole of the gear.
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  21. Install the camshaft gear nut and torque it to 40 ft. lb. Bend the lockplate to secure the nut.
  22.  
  23. Install the oil slinger on the crankshaft.
  24.  
  25. Install the remaining parts in reverse order of removal.
  26.  

6-230 Engine See Figure 1

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Fig. Fig. 1: Timing chain measurement 6 cyl-230 engine

Special tools are needed for this job.

  1. Remove the timing chain cover. Measure across the gap between the chain sides. If the gap is less than 3.38 in., the chain is stretched and should be replaced.
  2.  
  3. Install the cam sprocket remover tool as shown under Cylinder Head Removal and Installation.
  4.  
  5. Remove the sprocket with the tool as described in Cylinder Head.
  6.  
  7. Slide the chain from the sprocket.
  8.  
  9. Remove the chain tensioner pin to release tension on the tensioner blade. Remove the blade assembly and spring.
  10.  
  11. Remove the chain guide bracket.
  12.  
  13. The crank sprocket may now be removed.
  14.  
  15. Install the tensioner bracket on the front plate with the rubber covered leg positioned between the chain and the front plate.
  16.  
  17. Install the two capscrews and washers and two new 5 / 16 -24 seal nuts. Hold these seal nuts from turning when tightening the bolts.
  18.  
  19. Position the tensioner blade assembly and spring on the anchor stud on the front engine plate. Bend the blade so that the hook at the upper end of the spring is aligned with the notch in the top of the blade.
  20.  
  21. Insert the tensioner pin so that it engages the spring and blade. Position the top of the tensioner in the bracket.
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  23. Rotate the engine so that No. 1 piston is at TDC compression. Air will be forced out the spark plug hole when this occurs.
  24.  
  25. With the engine at TDC #1, the keyways in the crankshaft should be in the 12 o'clock position.
  26.  
  27. Temporarily install the camshaft sprocket and turn the camshaft until the nose of the #1 cam lobe, and the dowel hole on the camshaft, are pointing downward to the 6 o'clock position. Remove the sprocket.
  28.  
  29. Install a key in the crankshaft keyway nearest the block.
  30.  
  31. Install the cam sprocket remover tool as before.
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  33. Position the chain on the sprockets so that the keyway of the crank sprocket is up and the keyway of the cam sprocket is down. The copper links of the chain should be aligned with the timing marks on the sprockets. When properly assembled, there should be 1 1 / 2 chain units, comprising 31 steel links between the copper links.
  34.  
  35. Lift the assembled chain and sprockets and slide the crank sprocket into position until it is fully seated.
  36.  
  37. Using the cam sprocket tool, tighten the nut to pull tension on the chain and align the sprocket with the end of the shaft. Push the sprocket off the tool and onto the shaft, aligning the key and key slot.
  38.  
  39. Position the fuel pump eccentric on the camshaft sprocket. Install the capscrew, lockwasher and flat washer.
  40.  
  41. Remove the camshaft tool.
  42.  

6-232 and 258 Engines See Figures 2 and 3

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Fig. Fig. 2: Timing mark alignment 6 cyl-232 and 258 engines



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Fig. Fig. 3: Timing mark alignment verification 6 cyl-232 and 258 engines

  1. Remove the drive belts, engine fan and hub assembly, accessory pulley, vibration damper and timing chain cover.
  2.  
  3. Remove the oil seal from the timing chain cover.
  4.  
  5. Remove the camshaft sprocket retaining bolt and washer.
  6.  
  7. 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.
  8.  
  9. Remove the crankshaft sprocket, camshaft sprocket, and timing chain as an assembly. Disassemble the chain and sprockets.
  10.  
  11. Assemble the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks aligned.
  12.  
  13. Install the assembly to the crankshaft and the camshaft. Double check the alignment by counting the number of links or pins with the sprockets positioned as illustrated.
  14.  
  15. Install the camshaft sprocket retaining bolt and washer and tighten to 45-55 ft. lb.
  16.  
  17. Install the timing chain cover and a new oil seal.
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  19. Install the vibration damper, accessory pulley, engine fan and hub assembly and drive belts. Tighten the belts to the proper tension.
  20.  

8-304, 360 and 401 Engines See Figures 4 and 5

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Fig. Fig. 4: Timing mark alignment 8 cyl-304, 360 and 401 engines



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Fig. Fig. 5: Timing mark alignment verification 8 cyl-304, 360 and 401 engines

  1. Remove the timing chain cover and gasket.
  2.  
  3. Remove the crankshaft oil slinger.
  4.  
  5. Remove the camshaft sprocket retaining bolt and washer, distributor drive gear and fuel pump eccentric.
  6.  
  7. Rotate the crankshaft until the timing mark on the crankshaft sprocket is adjacent to, and on a center line with, the timing mark on the camshaft sprocket.
  8.  
  9. Remove the crankshaft sprocket, camshaft sprocket and timing chain as an assembly.
  10.  
  11. Clean all of the gasket surfaces.
  12.  
  13. Assemble the timing chain, crankshaft sprocket and camshaft sprocket with the timing marks on both sprockets aligned.
  14.  
  15. Install the assembly to the crankshaft and the camshaft. Double check the alignment by counting the number of links or pins with the sprockets positioned as illustrated.
  16.  
  17. Install the fuel pump eccentric, distributor drive gear, washer and retaining bolt. Tighten the bolt to 25-35 ft. lb.
  18.  
  19. Install the crankshaft oil slinger.
  20.  
  21. Install the timing chain cover using a new gasket and oil seal.
  22.  

8-327 and 350 Engines

  1. Remove the timing chain cover, and rotate the crankshaft until the timing marks on both the crankshaft and camshaft sprockets are aligned.
  2.  
  3. Remove the crankshaft oil slinger from the crankshaft.
  4.  
  5. Remove the fuel pump eccentric from the face of the camshaft sprocket by removing the bolt, lockwasher and flat washer. On the 350 V8, remove the distributor drive gear.
  6.  
  7. Pry the camshaft sprocket and the crankshaft sprocket forward a little at a time until the camshaft sprocket is free from the camshaft. Remove the timing chain from both sprockets.
  8.  
  9. Continue prying the crankshaft sprocket forward until it is free of the crankshaft.
  10.  
  11. If the engine has been disturbed while the timing chain was removed from the engine or the timing marks on both the sprockets were not aligned prior to being removed, then it is necessary to establish the correct valve timing.
  12.  
  13. Index the 0 marks on the camshaft and crankshaft sprockets on an imaginary line drawn vertically through the centerline of each sprocket. See Step 1.
  14.  
  15. Adjust the positioning of the crankshaft and camshaft so that the sprockets can be installed in the position described in Step 7.
  16.  
  17. Without disturbing the positioning of the indexed sprockets and chain assembly, lift up the indexed assembly and slide the sprockets onto their shafts. Make sure the longer hubs of both sprockets face the block.
  18.  
  19. To check the assembly, rotate the crankshaft until the timing marks on the camshaft sprocket is on a horizontal line at either the 3 or 9 o'clock position. Count the number of links or pins on the timing chain between the two timing marks. There should be 10 links or 20 pins between the timing marks.
  20.  
  21. On the 8-327, install the fuel pump eccentric, putting the dowel in the eccentric in the depression in the sprocket. On the 8-350, install the fuel pump eccentric and the distributor drive gear. Install the bolt and washer and torque to 50-55 ft. lb.
  22.  
  23. Install the oil slinger on the crankshaft with the flange facing outward. Install any timing chain cover studs that may have been removed and install the timing chain cover.
  24.  

 
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