GM Camaro 1967-1981 Repair Guide

Camshaft

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REMOVAL & INSTALLATION



230 and 250 cid Engines

Due to the length of the inline six cylinder camshaft, a large amount of working room will be required in front of the engine to remove the camshaft. There are two ways to go about this task: either remove the engine from the car, or remove the radiator, grille and all supports which are mounted directly in front of the engine. If the second alternative is chosen, you must also disconnect the motor mounts and raise the front of the engine enough to gain the clearance necessary to remove the cam from the engine.

  1. In addition to removing the timing gear cover, remove the grille and radiator.
  2.  
  3. Remove the valve cover and gasket, loosen all the valve rocker arm nuts and pivot the arms clear of the pushrods.
  4.  
  5. Remove the distributor and the fuel pump.
  6.  
  7. Remove the coil, the side cover and its gasket. Remove the pushrods and valve lifters.
  8.  
  9. Remove the two camshaft thrust plate retaining screws by working through the holes in the camshaft gear.
  10.  
  11. Remove the camshaft and gear assembly by pulling it out through the front of the block.
  12.  

If renewing either the camshaft or the camshaft gear, the gear must be pressed off the camshaft. The replacement parts must be assembled in the same manner (under pressure). In placing the gear on the camshaft, press the gear onto the shaft until it bottoms against the gear spacer ring. The end clearance of the thrust plate should be .001 to .005 in.

  1. Install the camshaft assembly in the engine.
  2.  

Pre-lube the cam lobes with E.O.S. or SAE 90 gear lubricant. Do not dislodge the cam bearings when inserting the camshaft.

  1. Turn the crankshaft and the camshaft to align and bring the timing marks together. Push the camshaft into this aligned position. Install the camshaft thrust plate-to-block screws and tighten them to 6-7 1 / 2 ft. lbs.
  2.  
  3. Runout on either the crankshaft or the camshaft gear should not exceed .003 in.
  4.  
  5. Backlash between the two gears should be between .004 and .006 in.
  6.  
  7. Install the timing gear cover and its gasket.
  8.  
  9. Install the oil pan and gaskets.
  10.  
  11. Install the harmonic balancer.
  12.  
  13. Line up the keyway in the balancer with the key on the crankshaft and the drive balancer onto the shaft until it bottoms against the crankshaft gear.
  14.  
  15. Install the valve lifters and pushrods. Install the side cover with new gasket. Attach the coil wires. Install the fuel pump.
  16.  
  17. Install the distributor and set the timing as described under "Distributor Installation" at the beginning of this section.
  18.  
  19. Pivot the rocker arms over the pushrods and adjust the valves.
  20.  
  21. Add oil to the engine. Install and adjust the fan belt.
  22.  
  23. Install the radiator or shroud.
  24.  
  25. Install the grille assembly.
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  27. Fill the cooling system, start the engine and check for leaks.
  28.  
  29. Check and adjust the timing.
  30.  

Except 230, 231 and 250 Engines

  1. Remove the intake manifold, valve lifters and timing chain cover, as described in this section.
  2.  
  3. Remove the grille and radiator.
  4.  
  5. Remove the fuel pump and pump pushrod.
  6.  
  7. Remove the camshaft sprocket bolts, the sprocket and the timing chain. A light blow to the lower edge of a tight sprocket should free it (use a plastic mallet).
  8.  
  9. Install two 5 / 16 -18X4 in. bolts in the cam bolt holes and pull the cam from block.
  10.  

All camshaft journals are the same diameter and care must be taken while removing the camshaft to avoid damage to the bearings.

To install:
  1. Reverse removal procedure, aligning the timing marks.
  2.  

Pre-lube the cam lobes with E.O.S. or SAE 90 gear lubricant. Do not dislodge the cam bearings when installing the camshaft.

231 cid Engine

  1. Drain the engine coolant and remove the radiator and radiator hoses.
  2.  
  3. Remove the water pump and all the drive belts. Remove the alternator.
  4.  
  5. Remove the crankshaft pulley and the vibration damper.
  6.  
  7. Remove the intake manifold. Mark the location of the distributor and remove the distributor.
  8.  
  9. Remove the fuel pump. Remove the timing chain cover and the oil pump.
  10.  
  11. Remove the timing chain and the camshaft sprocket, along with the distributor drive gear and the fuel pump eccentric.
  12.  
  13. Remove the rocker arm covers and the rocker arm assemblies. Mark the pushrods and remove them. Remove the lifters. Mark them so they can be returned to their original position.
  14.  
  15. Carefully remove the camshaft from the engine. Make sure you don't damage the bearings.
  16.  
  17. Installation is in the reverse order of removal. Remember to pack the oil pump with petroleum jelly.
  18.  

 
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