GM Bonneville/Eighty Eight/LeSabre 1986-1999

Rocker Arm/Shafts

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REMOVAL & INSTALLATION



1.8L (VIN 1) Engine

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rocker arm cover(s).
  4.  
  5. Remove the rocker arm shaft(s).
  6.  
  7. Place the shaft on a clean surface.
  8.  



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Fig. Fig. 1: Exploded view of the rocker arms and related components - 1.8L (VIN 1) engine

  1. Remove the nylon rocker arm retainers. A pair of slip joint pliers is good for this.
  2.  

Make sure to keep all components in order for reassembly!

  1. Slide the rocker arms off the shaft and inspect them for wear or damage. Keep them in order!
  2.  
  3. To install reverse steps 1 through 9. If new rocker arms are being installed, note that they are stamped R (right) or L (left), meaning that they be used on the right or left of each cylinder, NOT right and left cylinder banks. Each rocker arm must be centered over its oil hole. New nylon retainers must be used.
  4.  

1.8L (VIN 1, C, L and K) Engine

See Figures 2 through 9

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the valve cover, as outlined earlier in this section.
  4.  
  5. Remove the rocker arm pedestal retaining bolts, then remove the pedestal and rocker arm assembly and place it on a clean surface.
  6.  



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Fig. Fig. 2: Unfasten the retainers, then remove the rocker arms

  1. If necessary, remove the pushrod guide plate, then remove the pushrods.
  2.  

Intake and exhaust pushrods are the same length. Store components in order so they can reassembled in the same location.

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Fig. Fig. 3: Remove the pushrod guide plate ...



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Fig. Fig. 4: ... then remove the pushrods



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Fig. Fig. 5: Lay the valve train components out on a clean surface, in the proper orientation for installation



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Fig. Fig. 6: Exploded view of the valve train components - 1.8L (VIN C) engine shown



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Fig. Fig. 7: Rocker arms and related components - 1991-99 VIN L engine and 1998-99 VIN 1 engine



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Fig. Fig. 8: Exploded view of the rocker arms and pivots - 1991 supercharged engine shown

  1. Clean the rocker arms and pedestal bolts in a suitable solution and inspect for wear. Make sure to clean all of the thread adhesive from the rocker arm pedestal bolts.
  2.  



Click image to see an enlarged view

Fig. Fig. 9: Valve train components - 1999 VIN K engine shown, later models similar

To install:
  1. If removed, install the pushrods and make sure they seat in the lifter.
  2.  

On 1998-99 vehicles, the bolts rocker arm bolts are designed to permanently stretch when tightened. The correct part number fastener must be used to replace this type of fastener. Do NOT use a bolt which is stronger in this application. If the proper bolt is not used, the parts will not be tightened correctly, and part or system damage may occur.

  1. Apply a threadlocking compound to the bolt threads before reassembly.
  2.  
  3. Install the pedestal and rocker arm assemblies, then tighten the retaining bolts as follows:
    1. 1988-92 vehicles: 28 ft. lbs. (18 Nm).
    2.  
    3. 1991-98 vehicles: 19 ft. lbs. (29 Nm), plus an additional 90° with a torque angle meter.
    4.  
    5. 1999-99 vehicles: 11 ft. lbs. (19 Nm), plus an additional 90° with a torque angle meter.
    6.  

  4.  
  5. Install the valve cover(s), as outlined earlier, then connect the negative battery cable.
  6.  
  7. Start engine and check for fluid leaks and listen for valve train noise.
  8.  

 
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