Chevrolet Full Size Cars 1979-1989

Rocker Arms

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REMOVAL & INSTALLATION



Gasoline Engines
CHEVROLET PRODUCED ENGINES


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Fig. Fig. 1 Common Chevrolet rocker arm components



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Fig. Fig. 2 Remove the rocker arm retaining nut



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Fig. Fig. 3 Then remove the rocker arm pivot



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Fig. Fig. 4 With the nut and pivot removed, the rocker arm is free

To access the rocker arms, first remove the valve covers. With the covers removed, loosen and remove the adjusting nuts and the rocker arm pivots. The rocker arms are then free to be removed from the cylinder head studs. Be sure to properly adjust the valve lash after replacing the rocker arms. Coat the replacement rocker arm and ball with SAE 90 gear oil before installation. Make sure the valves are closed on the cylinder you are working on during adjustment.

When replacing an exhaust rocker, move an old intake rocker to the exhaust rocker arm fastener and install the new rocker arm on the intake stud. This will prevent burning of the new rocker arm on the exhaust position.

Rocker arms studs that have damaged threads or are loose in the cylinder heads may be replaced by reaming the bore and installing oversize studs. Oversizes available are 0.003 in. and 0.013 in. The bore may also be tapped and screw-in studs installed. Several aftermarket companies produce complete rocker arm stud kits with installation tools. Some latemodel high performance small block engines use screw-in studs and pushrod guide plates.

BUICK PRODUCED V6 ENGINE


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Fig. Fig. 5 Removing the rocker arm nylon retainers 231 V6 rocker shafts.



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Fig. Fig. 6 Loosen the rocker shaft retaining bolts using a ratchet



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Fig. Fig. 7 Remove the shaft retaining bolts in order to free the shaft assembly



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Fig. Fig. 8 With the bolts removed, the shaft and rocker arm assembly is free to be removed from the cylinder head



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Fig. Fig. 9 When replacing the rocker arms take note of the markings for proper installation 231 V6 engine



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Fig. Fig. 10 Rocker arm and shaft positioning 231 V6 engine

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rocker arm covers.
  4.  
  5. Remove the rocker arm shaft assembly bolts.
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