AMC Coupes/Sedans/Wagons 1975-1988 Repair Information

Rocker Shafts and Rocker Studs

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REMOVAL & INSTALLATION 4-150 Engine



See Figure 1

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Fig. Fig. 1: To remove the bridge and cap assemblies from the rockers, unfasten the retaining bolts

  1. Remove the rocker arm cover. The cover seal is RTV sealer. Break the seal with a clean putty knife or razor blade. Don't attempt to remove the cover until the seal is broken. To remove the cover, pry where indicated at the bolt holes.
  2.  
  3. Remove the two capscrews at each bridge and pivot assembly. It's best to remove the capscrews alternately, a little at a time each to avoid damage to the bridge.
  4.  
  5. Remove the bridges, pivots and rocker arms. Keep them in order.
  6.  
  7. Install the rocker arms and bridge and pivot assemblies. Tighten the capscrews to 19 ft.lb.
  8.  
  9. Clean the mating surfaces of the cover and head.
  10.  
  11. Run a 1 / 8 in. (3.175mm) bead of RTV sealer around the mating surface of the head. Install the cover within 10 minutes! Don't allow any of the RTV material to drop into the engine! In the engine it will form and set and possibly block and oil passage. Torque the cover bolts to 36-60 in.lb.
  12.  

4-151 Engines See Figure 2

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Fig. Fig. 2: View of the rocker arm assembly4-151 engine

  1. Remove the rocker arm cover.
  2.  
  3. Remove the rocker arm capscrew and ball.
  4.  
  5. Remove the rocker arm.
  6.  
  7. Install rocker arms. Tighten the capscrews to 20 ft.lb. DO NOT OVERTORQUE!
  8.  
  9. Clean the mating surfaces of the cover and head.
  10.  
  11. Install the cover. Tighten the bolts to 36-60 in.lb.
  12.  

6-Cylinder 232, 258 and 8-Cylinder 304 Engines See Figures 3 through 14

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Fig. Fig. 3: Check the rocker arm retaining nuts for stress cracks



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Fig. Fig. 4: Visually inspect the rocker arm-to-shaft contact area



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Fig. Fig. 5: Exploded view of the V8 valve train components1973 models



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Fig. Fig. 6: Valve train components used on 6-cylinder engines



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Fig. Fig. 7: Unfasten the rocker cover retaining bolts ...



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Fig. Fig. 8: ... then remove the rocker cover from the engine



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Fig. Fig. 9: Remove the 2 capscrews from the pivot ...



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Fig. Fig. 10: ... then remove the bridged pivot from the assembly



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Fig. Fig. 11: Remove the rocker arms and place them with their corresponding pivots



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Fig. Fig. 12: Remove the thermostat housing retaining bolts ...



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Fig. Fig. 13: ... then remove the housing cover



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Fig. Fig. 14: Remove the thermostat from the engine block

On these engines the rocker arms pivot on a bridged pivot that is secured with two capscrews. The bridged pivots maintain proper rocker arm-to-valve tip alignment.

  1. Remove the rocker cover and gasket.
  2.  
  3. Remove the two capscrews at each bridged pivot, backing off each capscrew one turn at a time to avoid breaking the bridge.
  4.  
  5. Remove each bridged pivot and corresponding pair of rocker arms and place them on a clean surface in the same order as they are removed.
  6.  

Bridged pivots, capscrews, rockers, and pushrods must all be reinstalled in their original positions.

To install:
  1. Clean all the parts in a suitable solvent and use compressed air to blow out the oil passages in the pushrods and the rocker arms. Replace any excessively worn parts.
  2.  
  3. Install rocker arms, pushrods and bridged pivots in the same positions from which they were removed.
  4.  

Be sure that the bottom end of each pushrod is centered in the plunger which they were removed. Be sure that the bottom end of each pushrod is centered in the plunger cap of each hydraulic valve tappet.

  1. Install the capscrews and tighten them one turn at a time, alternating between the two screws on each bridge. Tighten the capscrews to 21 ft.lb. on the Sixes and 10 ft.lb. on the 304 V8.
  2.  
  3. Install the rocker cover(s) with new gasket(s).
  4.  

 
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