GM Corvette 1963-1982 Repair Guide

Timing Chain

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REMOVAL & INSTALLATION



See Figures 1 through 9

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Fig. Fig. 1: Timing mark alignment-1963-79 vehicles with steel camshaft gear shown



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Fig. Fig. 2: Timing mark alignment-1980-82 vehicles



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Fig. Fig. 3: Use a brush to remove the dirt or any other debris



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Fig. Fig. 4: Remove the timing chain cover



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Fig. Fig. 5: Align the timing marks ...



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Fig. Fig. 6: ... then remove the three bolts from the camshaft sprocket



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Fig. Fig. 7: You may need to use a prytool to help the sprocket off the camshaft



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Fig. Fig. 8: Remove the timing chain and camshaft sprocket from the vehicle



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Fig. Fig. 9: If crankshaft sprocket replacement is necessary, use a jawed puller to remove the sprocket

  1. Set the engine to top dead center with the number one cylinder on its compression stroke (both valves closed).
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  3. Remove the timing cover as previously outlined.
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  5. Remove the three bolts from the camshaft sprocket and pull the sprocket off of the camshaft. Lower the sprocket and remove the camshaft sprocket and chain.
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  7. Check the camshaft and crankshaft sprockets for wear. It is best to replace the timing set (chain and sprockets) together. If you do not have a puller to remove the crankshaft sprocket, replacement of only the cam sprocket and chain will usually result in a satisfactory repair. Remember that the total deflection of the chain (installed) should not exceed about 1 / 8 ".
  8.  

Most engines are equipped with the nylon-toothed camshaft sprocket. If you drive the car hard, or if the original sprocket failed prematurely, it may be wise to replace the nylon-toothed sprocket with the hardened-iron sprocket available through Chevrolet dealers. Make sure that you explain your intentions when purchasing the timing components, so that the chain and gears are properly matched. An all-metal cam gear produces a little more noise than the nylon-toothed gear, but will last considerably longer.

When installing the new timing components, be sure to align the timing marks of both the cam gear and crank gear. DO NOT rotate the engine while the timing chain is removed. Torque the camshaft sprocket bolts to 20 ft. lbs. and install the timing cover as previously outlined.

 
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