Repair Pontiac Mid-size 1974-1983 Repair Guide

Rocker Arms

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REMOVAL & INSTALLATION





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Fig. Fig. 1 After removing the valve cover, you can access the rocker arm shaft (1) and the rocker arms (2)



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Fig. Fig. 2 To remove the rocker arms, remove the rocker arm shaft assembly bolts ...



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Fig. Fig. 3 ... then remove the rocker arm shaft assembly and place on a clean workbench

V6 Engines and Buick Built 350 (VINS H, J & X) Engines
  1. Remove the valve covers.
  2.  
  3. Remove the rocker arm shaft assembly bolts.
  4.  
  5. Remove the rocker arm shaft assembly and place it on a clean surface.
  6.  
  7. To remove the rocker arms from the shaft, you must first remove the nylon arm retainers. These can be removed with locking jaw pliers, by prying them out, or by breaking them by hitting them below the head with a chisel.
  8.  
  9. Remove the rocker arms from the shaft. Make sure you keep them in order. Also note that the external rib on each arm points away from the rocker arm shaft bolt located between each pair of rocker arms.
  10.  
  11. If you are installing new rocker arms, note that the replacement rocker arms are marked "R" and "L" for right and left side installation. Do not interchange them.
  12.  
  13. Install the rocker arms on the shaft and lubricate them with oil.
  14.  

Install the rocker arms for each cylinder only when the lifters are off the cam lobe and both valves are closed.

  1. Center each arm on the 1 / 4 in. hole in the shaft. Install new nylon rocker arm retainers in the holes using a 1 / 2 in. drift.
  2.  
  3. Locate the pushrods in the rocker arm "cups" and insert the shaft bolts. Tighten the bolts a little at a time to 30 ft. lbs.
  4.  
  5. Install the valve covers using sealer or new gaskets.
  6.  

4 Cylinder, Inline 6 Cylinder and V8 Engines
EXCEPT DIESEL ENGINES


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Fig. Fig. 4 Exploded view of the valve cover and rocker arms-except Buick built V6 and V8 engines

  1. Remove the valve cover.
  2.  
  3. Remove the rocker arm flanged bolts, and remove the rocker pivots.
  4.  
  5. Remove the rocker arms.
  6.  

Remove each set of rocker arms (one set per cylinder) as a unit.

To install:

  1. Position a set of rocker arms (for one cylinder) in the proper location.
  2.  

Install the rocker arms for each cylinder only when the lifters are off the cam lobe and both valves are closed.

  1. Coat the replacement rocker arm and pivot with SAE 90 gear oil and install the pivots.
  2.  
  3. Install the flanged bolts and tighten alternately. Tighten the bolts to 25 ft. lbs.
  4.  

DIESEL ENGINES

When the diesel engine rocker arms are removed or loosened, the lifters must be bled down to prevent oil pressure buildup inside each lifter, which could cause it to raise up higher than normal and bring the valves within striking distance of the pistons.

  1. Remove the valve cover.
  2.  
  3. Remove the rocker arm pivot bolts, the bridged pivot and rocker arms.
  4.  
  5. Remove each rocker set as a unit.
  6.  

To install:

  1. Lubricate the pivot wear points and position each set of rocker arms in its proper location. Do not tighten the pivot bolts for fear of bending the valves when the engine is turned.
  2.  
  3. The lifters can be bled down for six cylinders at once with the crankshaft in either of the following two positions:
  4.  
    1. For cylinders number 3, 5, 7, 2, 4 and 8, turn the crankshaft so the saw slot on the harmonic balancer is at 0° on the timing indicator.
    2.  
    3. For cylinders 1, 3, 7, 2, 4 and 6, turn the crankshaft so the saw slot on the harmonic balancer is at 4 o'clock.
    4.  

  5. Tighten the rocker arm pivot bolts VERY SLOWLY to 28 ft. lbs. It will take 45 minutes to completely bleed down the lifters in this position. If additional lifters must be bled, rotate the engine to the other position, tighten the rocker arm pivot bolts, and again wait 45 minutes before rotating the crankshaft. Excess torque here can bend the pushrods, so be careful!
  6.  
  7. Assemble the remaining components in the reverse of disassembly. The rocker covers do not use gaskets, but are sealed with a bead of RTV (Room Temperature Vulcanizing) silicone sealer.
  8.  

 
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