Jeep CJ 1945-1970 Repair Information

Camshaft

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REMOVAL & INSTALLATION



See Figures 1 and 2



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Fig. Fig. 1: A dial indicator mounted on a base can be used to check for camshaft straightness



Click image to see an enlarged view

Fig. Fig. 2: To determine camshaft lobe height, subtract dimension B from dimension A

Caution must be taken when performing this procedure. Camshaft bearings are coated with babble material, which can be damaged by scraping the camshaft lobes across the bearing.

4-134 Engines
  1. Remove the engine.
  2.  
  3. Remove the exhaust manifold.
  4.  
  5. Remove the oil pump and the distributor.
  6.  
  7. Remove the crankshaft pulley.
  8.  
  9. Remove the cylinder head.
  10.  
  11. Remove the exhaust valves.
  12.  
  13. Remove the timing gear cover and the crankshaft and camshaft timing gears.
  14.  
  15. Remove the front end-plate.
  16.  
  17. Push the intake and exhaust valve lifters into the cylinder block as far as possible so that the ends of the lifters are not in contact with the camshaft.
  18.  
  19. Secure each tappet in the raised position by installing a clip type clothes pin on the shank of each tappet or tie them up in the plate and spacer.
  20.  
  21. Remove the crankshaft thrust plate attaching screws. Remove the camshaft thrust plate and spacer.
  22.  
  23. Pull the camshaft forward out of the cylinder block being careful to prevent damage to the camshaft bearing surfaces.
  24.  

To install:
  1. Slide the camshaft into the cylinder block being careful to prevent damage to the camshaft bearing surfaces.
  2.  
  3. Install the crankshaft thrust plate attaching screws. Install the camshaft thrust plate and spacer.
  4.  
  5. Remove the clothes pins.
  6.  
  7. Install the front end-plate.
  8.  
  9. Install the timing gear cover and the crankshaft and camshaft timing gears.
  10.  
  11. Install the exhaust valves.
  12.  
  13. Install the cylinder head.
  14.  
  15. Install the crankshaft pulley.
  16.  
  17. Install the oil pump and the distributor.
  18.  
  19. Install the exhaust manifold.
  20.  
  21. Install the engine.
  22.  

6-225 Engine
  1. Remove the engine.
  2.  


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the intake manifold and carburetor assembly.
  2.  
  3. Remove the distributor.
  4.  
  5. Remove the fuel pump.
  6.  
  7. Remove the alternator, drive belts, cooling fan, fan pulley and water pump.
  8.  
  9. Remove the crankshaft pulley and the vibration damper.
  10.  
  11. Remove the oil pump.
  12.  
  13. Remove the timing chain cover.
  14.  
  15. Remove the timing chain and the camshaft sprocket, along with the distributor drive gear and the fuel pump eccentric.
  16.  
  17. Remove the rocker arm assemblies.
  18.  

The pushrods need not be removed. But if they are, be sure that they are replaced in their original Positions.

  1. Lift the tappets up so that they are not in contact with the camshaft. Use wire clips or clip type pins to hold the tappets up.
  2.  
  3. Carefully guide the camshaft forward out of the engine. Avoid marring the bearing surfaces.
  4.  
  5. Coat all moving parts with an engine oil supplement, such as STP or its equivalent.
  6.  
  7. Slide the camshaft, carefully, into position. Avoid marring the bearing surfaces.
  8.  
  9. Drop the tappets back onto the camshaft.
  10.  
  11. Install the rocker arm assemblies.
  12.  
  13. Install the timing chain and the camshaft sprocket, along with the distributor drive gear and the fuel pump eccentric.
  14.  
  15. Install the timing chain cover.
  16.  
  17. Install the oil pump.
  18.  
  19. Install the crankshaft pulley and the vibration damper.
  20.  
  21. Install the alternator, drive belts, cooling fan, fan pulley and water pump.
  22.  
  23. Install the fuel pump.
  24.  
  25. Install the distributor.
  26.  
  27. Install the intake manifold and carburetor assembly.
  28.  
  29. Install the engine.
  30.  

6-226 Engine
  1. Drain the cooling system and remove the radiator.
  2.  


CAUTION
When draining coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Remove the timing chain and gears as described earlier.
  2.  
  3. Remove the fuel pump.
  4.  
  5. Remove the cylinder head.
  6.  
  7. Remove the oil pan.
  8.  
  9. Remove the oil pump.
  10.  
  11. Remove the tappet chamber cover.
  12.  
  13. Remove the valves and springs as described earlier.
  14.  
  15. Pull the tappets up and hold them in the up position with spring-type clothes pins.
  16.  
  17. Remove the camshaft thrust plate from the front of the block.
  18.  
  19. Pull the camshaft from the front of the block, being very careful to avoid damaging the journals and bearings.
  20.  
  21. Thoroughly clean the camshaft in a safe solvent.
  22.  
  23. Check the journals with a micrometer. If any journal is more than 0.001 in. (0.0254mm) out of round, the camshaft should be replaced.
  24.  
  25. Camshaft faces should not show any wear or scoring. Total camshaft run-out should not exceed 0.002 in. (0.0508mm). Replace the camshaft if it is at all suspect.
  26.  
  27. With an inside micrometer, check the bearing diameter. If any bearing is more than 0.004 in. (0.1016mm) oversize, it should be replaced. All bearings must be replaced as a set, if any one is worn or damaged.
  28.  
  29. To remove the bearings, remove the core plug at the rear of the block and insert a bearing puller. Remove the bearings one at a time.
  30.  
  31. When installing new bearings, replace them one at a time, making sure that the oil holes are aligned. When installing the front bearing, the small groove from the oil hole must be toward the front of the engine. Coat the rim of the core plug with gasket sealer before installing it.
  32.  
  33. Coat the camshaft with clean engine oil and slide it into place. Install the thrust plate and tighten the bolts to 182 inch lbs. (20 Nm).
  34.  
  35. Drop the tappets onto the camshaft.
  36.  
  37. Install the valves and springs as described earlier.
  38.  
  39. Install the tappet chamber cover.
  40.  
  41. Install the oil pump.
  42.  
  43. Install the oil pan.
  44.  
  45. Install the cylinder head.
  46.  
  47. Install the fuel pump.
  48.  
  49. Install the timing chain and gears as described earlier.
  50.  
  51. Install the radiator.
  52.  
  53. Fill the cooling system and road test the car.
  54.  

6-230 Engine
  1. Remove the cylinder head.
  2.  
  3. Lift the rocker arm guide from the head.
  4.  
  5. Check the rocker arms to determine which ones do not have tension against them. Turn these parallel to the camshaft.
  6.  
  7. Remove tension on the remaining rocker arms by backing off on the adjusting nuts. Then, turn these parallel to the camshaft.
  8.  
  9. Unbolt the camshaft retainer from the camshaft bearing support deck. Remove the retainer. Some engines have a shim between the retainer and deck. Do not lose it!
  10.  
  11. Pull forward on the camshaft to remove it from the deck.
  12.  
  13. Unbolt and remove the camshaft bearing support deck from the head.
  14.  
  15. Inspect the camshaft for wear or damage. Camshaft run-out should not exceed 0.0005 in. (0.0127mm). Camshaft bearing clearance should not exceed 0.004 in. (0.1016mm).
  16.  
  17. Coat all parts with engine oil supplement prior to installation. Do not forget the shim, if one was there to begin with. If a new camshaft bearing support deck is being installed, determine if a shim is needed. To do this, measure the distance between the centerline of the camshaft bearing deck front mounting holes and the retainer surface on the deck. If the dimension is 0.810 in. (20.574mm), the retainer is to be installed without a shim. If the dimension is 0.780 in. (19.812mm), a shim is required.
  18.  
  19. Install the camshaft bearing support deck on the head. Tighten the nuts to 146-182 inch lbs. (16-20 Nm).
  20.  
  21. Slide the camshaft into the deck.
  22.  
  23. Install the retainer. Some engines have a shim between the retainer and deck. Tighten the nuts to 146-182 inch lbs. (16-20 Nm).
  24.  
  25. Adjust the valves.
  26.  
  27. Install the rocker arm guide on the head.
  28.  
  29. Install the cylinder head.
  30.  

 
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