GM Metro/Sprint 1985-1993 Repair Guide

Valve Stem Seals

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REPLACEMENT



See Figures 1 and 2



Click image to see an enlarged view

Fig. Fig. 1: Removing the valve stem seal - Metro



Click image to see an enlarged view

Fig. Fig. 2: Removing the valve stem seal - Sprint

Head On Engine

When removing valve seals with the cylinder head on the engine, something must prevent the valve from dropping into the cylinder when the spring and retainer are removed. The method used most commonly is to fill the cylinder with compressed air.

  1. Remove the camshaft and, as required, the rocker arm assemblies.
  2.  
  3. On engines equipped with hydraulic lash adjusters, remove the adjusters and place in order of removal.
  4.  
  5. Rotate the engine so that the piston in the cylinder being worked on is at TDC on the compression stroke (both valves closed).
  6.  
  7. Remove the spark plug and install an air adapter tool. Pressurize the cylinder head with compressed air.
  8.  
  9. Using a spring compressor, compress the valve springs and remove the locks from the retainers.
  10.  
  11. Remove the retainers and springs from the cylinder head.
  12.  
  13. Remove the valve seal from the cylinder head.
  14.  

To install:
  1. Lubricate the valve with engine oil and install the valve seal.
  2.  

Never reuse old valve seals. Always install new valve seals when the cylinder head is disassembled.

  1. Install the valve spring and retainer on the cylinder head.
  2.  
  3. Using a spring compressor, compress the valve spring and install the locks in the retainers.
  4.  
  5. Remove the air adapter hose and proceed to the next cylinder.
  6.  
  7. Once all cylinders are assembled, use a rubber hammer to hit each valve assembly on the retainer side. This will positively seat the locks in the retainer.
  8.  
  9. On engines equipped with hydraulic lash adjusters, lubricate and install the adjusters in their original positions.
  10.  
  11. Install the camshaft and, as required, the rocker arm assemblies.
  12.  
  13. Adjust valve lash as required.
  14.  

Head Removed
  1. Remove the cylinder head from the engine.
  2.  
  3. Remove the camshaft and, as required, the rocker arm assemblies.
  4.  
  5. On engines equipped with hydraulic lash adjusters, remove the adjusters and place in order of removal.
  6.  
  7. Using a spring compressor, compress the valve springs and remove the locks from the retainers.
  8.  
  9. Remove the retainers and springs from the cylinder head.
  10.  
  11. Remove the valve from the combustion chamber side of the cylinder head.
  12.  
  13. Remove the valve seal from the cylinder head.
  14.  

To install:
  1. Lubricate the valve with engine oil and install from the combustion chamber side for the cylinder head.
  2.  
  3. Install a new valve seal on the cylinder head.
  4.  

Never reuse old valve seals. Always install new valve seals when the cylinder head is disassembled.

  1. Install the springs and retainers on the cylinder head one cylinder at a time.
  2.  
  3. Using a spring compressor, compress the valve springs and install the locks in the retainers.
  4.  
  5. Once all cylinders are assembled, use a rubber hammer to hit each valve assembly on the retainer side. This will positively seat the locks in the retainer.
  6.  
  7. On engines equipped with hydraulic lash adjusters, lubricate and install the adjusters in their original positions.
  8.  
  9. Install the camshaft and, as required, the rocker arm assemblies.
  10.  
  11. Install the cylinder head on the engine.
  12.  
  13. Adjust valve lash as required.
  14.  

 
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