Chevrolet Nova/ChevyII 1962-1979

Camshaft

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REMOVAL & INSTALLATION



4 and 6 Cylinder Engines


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Fig. Fig. 1 Timing mark alignment-4 and 6-cylinder engines

1962-69 VEHICLES
  1. In addition to removing the timing gear cover, remove the grille assembly.
  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 fuel pump.
  6.  
  7. Remove the coil, side cover, and 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 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 0.001-0.005 in.

To install:

  1. Install the camshaft assembly in the engine.
  2.  
  3. Turn the crankshaft and 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 torque them to 6-7 1 / 2 ft lbs.
  4.  
  5. Run-out on either crankshaft or camshaft gear should not exceed 0.003 in.
  6.  
  7. Backlash between the two gears should be 0.004-0.006 in.
  8.  
  9. Install the timing gear cover and gasket.
  10.  
  11. Install the oil pan and gaskets.
  12.  
  13. Install the harmonic balancer.
  14.  
  15. 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.
  16.  
  17. Install the valve lifters and pushrods. Install the side cover with a new gasket. Attach the coil wires; install the fuel pump.
  18.  
  19. Install the distributor and set the timing as described under "Distributor" at the beginning of this section.
  20.  
  21. Pivot the rocker arms over the pushrods and adjust the valves.
  22.  
  23. Add oil to the engine. Install and adjust the fan belt.
  24.  
  25. Install the radiator or shroud.
  26.  
  27. Install the grille assembly.
  28.  
  29. Fill the cooling system, start the engine, and check for leaks.
  30.  
  31. Check and adjust the timing.
  32.  

1970-79 VEHICLES

The manufacturer recommends that the engine be removed from the car to remove the camshaft. However, in most cases the preceeding procedure can be used. You may also have to raise the front of the engine for clearance.

V8 Engines
  1. Remove the intake manifold, valve lifters, and timing chain cover (requires oil pan removal), as described in this section.
  2.  
  3. Remove the grille, except on 1969 and later Novas. On these models, remove both front motor mount bolts and the right motor mount, then lower the engine until it rests on the frame.
  4.  
  5. On 1969 and later Novas, remove the two center bolts and the one lower bolt that secure the hood latch support. This will give adequate clearance for the cam.
  6.  
  7. Remove the camshaft sprocket bolts, sprocket, and timing chain. A light blow to the lower edge of a tight sprocket with a plastic mallet, should free it.
  8.  
  9. Install two 5 / 16 -18X4 in. bolts in the cam bolt holes and carefully pull the cam from the block.
  10.  
  11. To install, reverse the removal procedure, aligning the timing marks as illustrated.
  12.  

Cam lobes must be lubricated with Molykote or equivalent before installation. All cam journals are the same diameter, so make sure cam bearings are not dislodged during installation.

 
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