Jeep CJ 1945-1970 Repair Information

Timing Gears

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REMOVAL & INSTALLATION



L4-134 Engines After No. 175402 and All F4-134 Engines

See Figures 1 through 9



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Fig. Fig. 1: Remove the crankshaft pulley's Woodruff key and retain for installation



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Fig. Fig. 2: Slide the outer cover off of the crankshaft gear ...



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Fig. Fig. 3: ... then slide the crankshaft gear spacer off of the crankshaft



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Fig. Fig. 4: Use a puller to loosen the crankshaft gear ...



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Fig. Fig. 5: ... then slide the crankshaft gear off of the crankshaft



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Fig. Fig. 6: Remove the camshaft gear retaining bolt ...



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Fig. Fig. 7: ... then slide the washer/spacer off of the camshaft gear



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Fig. Fig. 8: Sometime during this procedure, be sure to clean the old gasket off the block



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Fig. Fig. 9: Use a puller to remove the camshaft gear from the camshaft

  1. Remove the timing gear cover.
  2.  
  3. Use a puller to remove both the crankshaft and the camshaft gear from the engine after removing all attaching nuts and bolts.
  4.  
  5. Remove the Woodruff keys.
  6.  

To install:
  1. Install the Woodruff key in the longer of the two key ways on the front end of the crankshaft.
  2.  
  3. Install the crankshaft timing gear on the front end of the crankshaft with the timing mark facing away from the cylinder block.
  4.  
  5. Align the key way in the gear with the Woodruff key and then drive or press the gear onto the crankshaft firmly against the thrust washer.
  6.  
  7. Turn the camshaft or the crankshaft as necessary so that the timing marks on the two gears will be together after the camshaft gear is installed.
  8.  
  9. Install the Woodruff key in the key way on the front of the camshaft.
  10.  
  11. Start the large timing gear on the camshaft with the timing mark facing out.
  12.  

Do not drive the gear onto the camshaft as the camshaft may drive the plug out of the rear of the engine and cause an oil leak.

  1. Install the camshaft retaining screw and tighten it to 30-40 ft. lbs. (41-54 Nm). This will draw the gear onto the camshaft as the screw is tightened. Standard running tolerance between the timing gears is 0.000-0.002 in. (0.00-0.05mm).
  2.  
  3. Install the timing gears with the marks aligned as shown.
  4.  
  5. Set the intake valve clearance to 0.020 in. (0.5mm) on the No. 1 cylinder.
  6.  
  7. Rotate the crankshaft until the No. 1 cylinder intake valve is ready to open as indicated by the IO mark on the flywheel. The mark should be centered in the hole.
  8.  

Some later models do not have an IO mark. TC and 5 degrees are the only marks. On these engines, the intake value opens at 9 degrees BTC. To estimate valve opening, measure the distance between TC and 5 degrees and measure about that distance further on. On CJ-3A models beginning with engine No. 130859, a 41/2in. (114.3mm) starter motor was used. To use the larger starter, it was necessary to increase the width of the cylinder block flange, partially covering the flywheel hole. This makes it impossible to use the hole for timing purposes. In this event, use the timing marks on the crankshaft pulley. If a replacement block is installed with the later design in a vehicle originally equipped with the earlier design timing marks, it will be necessary to cut away enough of the flange to allow a view of the timing marks, as no other timing marks exist on the these early engines.

 
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