Chevrolet Citation/Omega/Phoenix/Skylark 1980-1985 Repair Guide

Camshaft

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REMOVAL & INSTALLATION



Four Cylinder


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Fig. Fig. 1 On the 4-cylinder engine, remove the rocker arms, pushrods and valve lifters



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Fig. Fig. 2 View of the timing mark alignment-4-cylinder timing gears shown

  1. Remove the engine from the car, as outined earlier in this section.
  2.  
  3. Remove the valve cover, loosen the rocker arms and pivot them aside, and remove the pushrods. Keep them in order.
  4.  
  5. Remove the distributor and fuel pump.
  6.  
  7. Remove the pushrod cover from the side of the engine. Remove the lifters. Keep them in order.
  8.  
  9. Remove the alternator and its bracket, and remove the front engine mount bracket assembly.
  10.  
  11. Remove the oil pan. Remove the oil pump and gear assembly.
  12.  
  13. Remove the crankshaft hub and the front cover.
  14.  
  15. Remove the two camshaft thrust plate screws by working through the holes in the gear.
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  17. Remove the camshaft and gear assembly by pulling it through the front of the block. Be very careful not to damage the bearings.
  18.  
  19. If the timing gear must be removed, support the camshaft on a press, install press plates under the gear, and press off the gear.
  20.  


WARNING
Position the thrust plate so that the woodruff key in the camshaft does not damage the plate when the gear is pressed off.

To install:

  1. To press on the gear, support the camshaft behind the front journal with press plates. Place the gear spacer ring and thrust plate over the end of the camshaft, and install the woodruff key. Press the gear onto the camshaft until it bottoms against the gear spacer ring.
  2.  

The end clearance of the thrust plate should be between 0.0015 and 0.0050 in. If more, the thrust plate should be replaced. If less, replace the spacer ring.

  1. Coat the camshaft and gear with clean engine oil supplement. Install the camshaft into the block, being extremely careful not to contact the bearings with the cam lobes.
  2.  
  3. Align the timing marks. The engine should then be in the No. 4 firing position. Install the thrust plate-to-blockbolts and tighten to 75 in. lbs. (10 Nm.).
  4.  
  5. Install the timing cover crankshaft pulley, valve lifters (in original position) pushrods (in original positions), and oil pump shaft and gear assembly and the oil pan and fuel pump. Install the pushrod side cover with a thin bead of silicone seal running to the inside of the bolt holes. Be sure all the old sealer is removed before applying the new sealer.
  6.  
  7. Install the distributor: rotate the crankshaft until No. 1 cylinder is in firing position. The number one valves will both be closed, and the timing marks will be at "0". Install the distributor in its original position, with the rotor pointing toward the No. 1 spark plug tower.
  8.  
  9. Pivot the rocker arms over the pushrods, and tighten the rocker arm nuts to 20 ft. lbs. (27 Nm.) with the lifters on the base circle of the cam lobe as described under rocker arm removal earlier in this section. The rest of installation is the reverse of removal.
  10.  

Six Cylinder
  1. Remove the engine.
  2.  
  3. Remove the intake manifold.
  4.  
  5. Remove the rocker covers, pivot the rocker arms to the sides, and remove the pushrods, keeping them in order. Remove the valve lifters, keeping them in order. There are special tools which make lifter removal easier.
  6.  
  7. Remove the timing cover.
  8.  
  9. Remove the fuel pump and its pushrod.
  10.  
  11. Remove the timing chain and sprocket as described earlier in this section.
  12.  
  13. Carefully pull the camshaft from the block, being sure that the camshaft lobes do not contact the bearings.
  14.  

To install:

  1. Lubricate the camshaft journals with clean engine oil. Lubricate the lobes with "molykote" or the equivalent. Install the camshaft into the engine, being extremely careful not to contact the bearings with the cam lobes.
  2.  
  3. Install the timing chain and sprocket. Install the fuel pump and pushrod. Install the timing cover.
  4.  
  5. Install the valve lifters. If a new camshaft has been installed, new lifters should be used to ensure durability of the cam lobes.
  6.  
  7. Install the pushrods and rocker arms and the intake manifold. Adjust the valve lash after installing the engine. Install the valve covers.
  8.  

 
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