GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Valve Lifter

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REMOVAL, INSTALLATION & INSPECTION



2.2L Engine

See Figures 1 through 5

When installing new lifters, a pre-lube should always be applied to the lifter body. It is also a good idea to prime hydraulic lifters by submerging them in clean engine oil and depressing the plunger using an old pushrod. This allows the internal components of the hydraulic lifter to coat with oil before initial operation in the engine. All lifters should be replaced when a new camshaft is installed.

If any valve train components (lifters, pushrods, rocker arms) are to be reused, they must be tagged or arranged during removal to assure installation in their original locations.

  1. Remove the rocker arm cover.
  2.  
  3. Remove the cylinder head assembly from the engine.
  4.  
  5. Remove the bolts retaining the lifter anti-rotation brackets, then remove the brackets.
  6.  
  7. Remove the hydraulic roller lifters from the bores.
  8.  
  9. Inspect the lifter and lifter bore for wear and scuffing. Examine the roller for freedom of movement and/or flat spots on the roller surface.
  10.  



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Fig. Fig. 1: Remove the bolts retaining the lifter anti-rotation brackets ...



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Fig. Fig. 2: ... then remove the anti-rotation brackets



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Fig. Fig. 3: The lifters are located in bores in the engine block



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Fig. Fig. 4: Use a lifter removal tool to remove the lifters from the bore

To install:

If installing a new lifter, coat the lifter body with a suitable camshaft pre-lube

  1. Install each hydraulic lifter to its bore being careful to align the flat sides (top) of the lifters with the flat sides of the anti-rotation brackets. When properly installed the flat sides of each lifter are aligned parallel to the anti-rotation bracket. The roller at the bottom of the lifter is parallel to the camshaft lobe.
  2.  

Make sure to properly align and install each lifter as improper installation of the lifters or brackets could result in engine damage.

  1. Install the anti-rotation bracket retaining bolts and tighten to 97 inch lbs. (11 Nm).
  2.  
  3. Install the cylinder head.
  4.  
  5. Install the rocker arm cover.
  6.  



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Fig. Fig. 5: Removing the hydraulic roller lifter from the 2.2L engine

4.3L Engine

See Figures 6 through 10



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Fig. Fig. 6: Unfasten the lifter retainer bolts



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Fig. Fig. 7: Remove the lifter retainer



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Fig. Fig. 8: Remove the lifter from its bore



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Fig. Fig. 9: A magnet is useful in removing lifters from their bores



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Fig. Fig. 10: Stuck lifters must be freed using a slide hammer type lifter removal tool

  1. Remove the rocker arm cover.
  2.  
  3. Remove the intake manifold assembly.
  4.  

If any valve train components (lifters, pushrods, rocker arms) are to be reused, they must be tagged or arranged during removal to assure installation in their original locations.

  1. Remove the rocker arm and pushrod assemblies.
  2.  
  3. Remove the hydraulic lifter retainer bolts, them remove the retainers or retainers and restrictors, as equipped.
  4.  
  5. Remove the lifters from the engine.
  6.  

To install:
  1. Inspect the lifter and lifter bore for wear and scuffing. Examine the roller for freedom of movement and/or flat spots on the roller surface.
  2.  
  3. If new lifters are being installed, lubricate the lifters using a suitable pre-lube and add GM engine oil supplement or an equivalent additive to the crankcase.
  4.  
  5. Install the hydraulic lifters along with the restrictors and/or retainers. Secure the retainers using the bolts and tighten to 12 ft. lbs. (16 Nm).
  6.  
  7. Install the pushrods and rocker arm assemblies, then adjust the valve lash.
  8.  
  9. Install the intake manifold assembly.
  10.  
  11. Install the rocker arm covers.
  12.  

 
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