Chevrolet Nova/ChevyII 1962-1979

Timing Gear/Chain Cover

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All 4 and 6 cylinder engines have gear driven camshafts, while all V8 camshafts are driven by a timing chain. 4 or 6 cylinder timing gear replacement requires camshaft removal.

The six-cylinder engine uses a harmonic balancer that closely resembles the V8 type. The removal procedure for this damper will be the same as that used for the V8. Driving the damper back onto the crankshaft without supporting the pulley can cause damage. A replacing tool must be used during the reassembly operation.

REMOVAL & INSTALLATION





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Fig. Fig. 1 To access the timing cover, the harmonic balancer must be removed. Attach a puller as shown



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Fig. Fig. 2 Turn the pushing screw, then remove the harmonic balancer from the crankshaft



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Fig. Fig. 3 Unfasten the timing gear cover retaining screws



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Fig. Fig. 4 Make sure to remove the oil pan-to-timing cover bolts



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Fig. Fig. 5 Carefully separate the timing gear cover from the engine block ...



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Fig. Fig. 6 ... then remove the cover from the vehicle



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Fig. Fig. 7 With the timing cover removed, inspect the gears or chain for wear and damage

  1. Drain and remove the radiator.
  2.  
  3. If necessary for access, remove the water pump as outlined later in this section.
  4.  
  5. Remove the harmonic balancer (six- and eight-cylinder) or crankshaft pulley (four-cylinder) using a puller.
  6.  
  7. Drain the engine oil and remove the oil pan on all engines through 1972, and on small block V8s through 1974. Remove the V8 water pump. If the oil pan isn't to be removed, cut the pan seal off flush with the block.
  8.  
  9. Remove the timing cover attaching screws, cover, and gasket.
  10.  
  11. Reverse this procedure for installation for all engines except 1975-79 V8 engines.
  12.  


WARNING
The six- and eight-cylinder engines use a harmonic balancer. Breakage may occur if the balancer is hammered onto the crankshaft.

This balancer must be drawn back into place.

Cover Installation

1975-79 V8 Engines

The installation procedure for these engines has been revised. Use the following procedure.

  1. Clean the block and timing cover gasket surfaces.
  2.  
  3. Use a sharp knife to remove any excess oil pan gasket material which may be protruding at the oil pan-to-engine block junction.
  4.  
  5. Apply a 1 / 8 in. bead of silicone rubber sealer to the joint formed at the oil pan and cylinder block, as well as the entire oil pan front lip.
  6.  
  7. Coat the cover gasket with gasket sealer and place it in position on the timing cover.
  8.  
  9. Place the timing cover on the block. Loosely install the top four bolts (approximately three turns). Install two 1 / 4 -20X 1 / 2 in. screws one on each side at the lower hole in the front cover. Apply a bead of silicone sealer on the bottom of the seal and install the cover.
  10.  
  11. Tighten the cover screws alternately and evenly while using a drift to align the dowel pins in the block to the corresponding holes in the cover.
  12.  
  13. Remove the two screws which were used in Step 5 to draw up the cover and install the rest of the cover screws, torquing them to 80 in. lbs.
  14.  

OIL SEAL REPLACEMENT



  1. After removing the gear cover, carefully pry the oil seal out of the front of the cover with a large prytool.
  2.  
  3. Install a new lip seal with the lip (open side of seal) inside, then drive or press the seal into place.
  4.