GM Corsica/Beretta 1988-1996 Repair Guide

Rocker Arms and Pushrods

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REMOVAL & INSTALLATION



2.0L and 2.2L Engines

See Figure 1

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rocker arm (valve) cover.
  4.  

Be sure to keep the components in order for installation purposes.

  1. Remove the rocker arm nuts, then remove the rocker arm(s) and ball(s).
  2.  
  3. Remove the pushrods.
  4.  

To install:
  1. Coat the bearing surfaces of the rocker arms and the rocker arm balls with Molykote® or its equivalent.
  2.  
  3. Install the pushrods, making sure they seat in their lifters.
  4.  
  5. Install the rocker arm(s) and ball(s). Apply Dri-Slide Moly lubricant1042948 or equivalent to the threads of the stud(s), then install the nuts.
  6.  
  7. Tighten the rocker arm nuts to 7-11 ft. lbs. (10-14 Nm) for1988 vehicles, to14 ft. lbs. (20 Nm) for1989-92 vehicles and to 22 ft. lbs. (30 Nm). for1993-95 vehicles.
  8.  
  9. Install the rocker arm (valve) cover.
  10.  
  11. Connect the negative battery cable.
  12.  

2.3L Engine

The valve train consists of 2 chain driven overhead camshafts with direct acting lifters.

2.8L and 3.1L V5 Engine
1988 VEHICLES
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rocker arm (valve) cover(s).
  4.  
  5. Remove the rocker arm nuts, rocker arm balls, rocker arms, push rod guides and push rods and place in a rack so that they may be reinstalled in the same location.
  6.  

To install:
  1. Coat the bearing surfaces of the rocker arms and the rocker arm balls with Molykote® or its equivalent.
  2.  
  3. Install the pushrods making sure that they seat properly in the lifter.
  4.  
  5. Install the pushrod guides, rocker arms, pivot balls and nuts.
  6.  
  7. Tighten the rocker arm nuts to18 ft. lbs. (24 Nm).
  8.  
  9. Connect the negative battery cable.
  10.  

1989-95 VEHICLES
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the rocker arm (valve) cover(s).
  4.  
  5. Unfasten and remove the rocker arm nuts or bolts depending upon vehicle year.
  6.  
  7. Remove the rocker arm pivot balls, rocker arms and push rods and place in a rack so that they may be reinstalled in the same location.
  8.  



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Fig. Fig. 1: Remove the rocker arm retaining bolts

See Figures 2, 3, 4 and 5



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Fig. Fig. 2: Remove the rocker arm assembly



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Fig. Fig. 3: Remove the pushrod by pulling it straight up, out of the cylinder head



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Fig. Fig. 4: Exploded view of the rocker arms -1988-94 vehicles



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Fig. Fig. 5: A roller rocker arm system is used on1995 vehicles

To install:

Intake pushrods are marked orange, red or yellow (depending upon the year of the vehicle) and are 5 in. (142mm) long. Exhaust pushrods are marked blue or green (depending upon the year of the vehicle)and are 53/8in. (152mm) long.

  1. Coat the bearing surfaces of the rocker arms and the rocker arm balls with Molykote® or its equivalent.
  2.  
  3. Install the pushrods, in their original locations, making sure that they seat properly in the lifter.
  4.  
  5. Install the pushrods, rocker arms, pivot balls and nuts.
  6.  
  7. Either tighten the rocker arm nuts to18 ft. lbs. (24 Nm) or tighten the rocker arm bolts to 89 inch lbs. (10 Nm), plus an additional 30 degree rotation.
  8.  
  9. Install the rocker arm (valve) cover(s).
  10.  
  11. Connect the negative battery cable.
  12.  

See Figure 6



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Fig. Fig. 6: Installed view of the rocker arms (A), bolts (B) valve springs (C) and related valve train components

VALVE LASH ADJUSTMENT



2.8L and 3.1L Engines

The following adjustment procedure should be used when reconditioning a valve seat, and a new adjustable rocker arm stud has been installed.

  1. Install the rocker arms, balls and nuts. Tighten the rocker arm nuts until all lash is eliminated.
  2.  
  3. Adjust the valves when the lifter is on the base circle of a camshaft lobe:
    1. Crank the engine until the mark on the crankshaft pulley lines up with the O mark on the timing tab. Make sure that the engine is in the No.1 firing position. Place your fingers on the No.1 rocker arms as the mark on the crank pulley comes near the O mark. If the valves are not moving, the engine is in the No.1 firing position. If the valves move, the engine is in the No. 4 firing position; rotate the engine1 complete revolution and it will be in the No.1 position.
    2.  
    3. When the engine is in the No.1 firing position, adjust the following valves:

      Exhaust -1,2,3
       
      Intake -1,4,5
       

    4.  
    5. Back the adjusting nut out until lash can be felt at the pushrod, then turn the nut until all lash is removed (this can be determined by rotating the pushrod while turning the adjusting nut). When all lash has been removed, turn the nut in1 1 / 2 additional turns, this will center the lifter plunger.
    6.  
    7. Crank the engine1 complete revolution until the timing tab and the O mark are again in alignment. Now the engine is in the No. 4 firing position. Adjust the following valves:

      Exhaust - 4,4,5
       
      Intake - 2,3,4
       

    8.  

  4.  

 
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