GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Valve Lifter

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REMOVAL & INSTALLATION



See Figures 1 and 2

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 a 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.

1.9L Engine

The camshaft directly actuates the rocker arms on the 1.9L engine, so no lifter assemblies are utilized.

2.0L Engine

See Figures 1, 2 and 3

  1. Remove the rocker arm covers.
  2.  
  3. Loosen the rocker arms and remove the pushrods and guide plates.
  4.  
  5. Using Valve Lifter Removal tool J-29834, or equivalent, remove the valve lifters.
  6.  

Keep all components in order. If reusing components, install them into their original positions.

  1. For proper rotation during engine operation, the lifter bottom must be convex. Check the lifter bottom for proper shape using a straight edge. If the lifter bottom is not convex, replace the lifter. Chances are if lifters are in need of replacement, so is the camshaft.
  2.  
  3. Using the valve lifter tool, install the lifters into the block.
  4.  
  5. Installation is the reverse of removal. Adjust the valve lash.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: Removing a lifter from the bore in the lifter valley on V-type engines



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Fig. Fig. 2: Cross-sectional view of a common hydraulic lifter assembly



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Fig. Fig. 3: A common valve lifter removal and installation tool

2.2L Diesel

See Figure 4

The diesel engine uses solid type lifters.

  1. Remove the rocker arm cover and side cover.
  2.  
  3. Remove the rocker arm shaft assembly.
  4.  
  5. Remove the pushrods.
  6.  
  7. Remove the hydraulic lifters using an appropriate lifter removal tool.
  8.  
  9. Installation is the reverse of removal.
  10.  
  11. Adjust the valve lash.
  12.  



Click image to see an enlarged view

Fig. Fig. 4: Removing the side cover for access to the lifters-2.2L diesel engine

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.

2.5L Engine

See Figure 5

  1. Remove the rocker arm covers.
  2.  
  3. Remove the pushrod cover:
    1. Remove the alternator and bracket.
    2.  
    3. Disengage the ignition coil wires, then remove the spark plug wires and bracket from the intake manifold.
    4.  
    5. Remove the fuel pipes and clips from the pushrod cover.
    6.  
    7. Remove the oil pressure gage sender, then remove the wiring harness brackets from the pushrod cover.
    8.  
    9. Unscrew the nuts from the cover attaching studs, reverse 2 of the nuts so the washers face outward and screw them back onto the 2 inner studs.
    10.  
    11. Assemble the 2 remaining nuts to the same 2 inner studs with the washers facing inward, then using a small wrench on the inner nut (on each stud) jam the nuts slightly together.
    12.  
    13. Again using the wrench on the inner stud, unscrew the studs until the cover breaks loose, then remove the nuts from the studs and remove the cover from the engine. Remove the studs from the cover and reinstall them to the engine. Tighten the studs to 88 inch lbs. (10 Nm).
    14.  

  4.  

Keep all components in order. If reusing components, install them into their original positions. If a new hydraulic lifter is being installed, all sealer coating inside the lifter must be removed.

  1. Remove the pushrods.
  2.  
  3. Remove the lifter studs and retainers.
  4.  
  5. Remove the lifter guides and lifters.
  6.  
  7. 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.
  8.  
  9. Installation is the reverse of removal, be sure to lubricate the lifter and lifter body using clean engine oil. If installing new lifters, all sealer coating inside the lifter must first be removed.
  10.  
  11. When installing the pushrod cover, use a thin coating of RTV sealant around the entire cover flange. Install the cover retaining nuts and tighten to 106 inch lbs. (12 Nm) starting at the front of the engine and working toward the nuts in the rear.
  12.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the hydraulic lifter and related component installation-2.5L engine

2.8L Engine

See Figure 6

Some engines have both standard size and 0.25mm (0.010 in.) oversize valve lifters. The cylinder block will be marked with a white paint mark and 0.25mm O.S. stamp where the oversize lifters are used.

If lifter replacement is necessary, use new lifters with a narrow flat along the lower 3 / 4 of the body length. This provides additional oil to the cam lobe and lifter surfaces.

Use of a Hydraulic Lifter Remover tool J-9290-1 (slide hammer type) or J-3049-A (plier type) will greatly ease the removal of stuck lifters.

  1. Remove the rocker arm covers.
  2.  
  3. Remove the intake manifold.
  4.  
  5. Remove the rocker arm nuts and balls.
  6.  
  7. Remove the rocker arms and pushrods.
  8.  

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 lifters from the bores.
  2.  

To install:
  1. For proper rotation during engine operation, the lifter bottom must be convex. Check the lifter bottom for proper shape using a straight edge. If the lifter bottom is not convex, replace the lifter. Chances are if lifters are in need of replacement, so is the camshaft.
  2.  
  3. Lubricate and install the lifters. If installing new lifters, coat the lifter body and foot using Molykote® or an equivalent prelube, then add 1051396 or an equivalent engine oil supplement to the crankcase.
  4.  
  5. Install the pushrods, rocker arms, rocker arm nuts and balls, then properly adjust the valve lash.
  6.  
  7. Install the intake manifold.
  8.  
  9. Install the rocker arm covers.
  10.  



Click image to see an enlarged view

Fig. Fig. 6: Oversize lifter marking-2.8L engine

4.3L Engine
  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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