GM Storm/Spectrum 1985-1993 Repair Guide

Valve Stem Seals

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REPLACEMENT



Cylinder Head Installed

The valve stem seals on the Spectrum and Storm SOHC engines may be replaced with the cylinder head either on or off the engine. The removal procedure with the cylinder head installed utilizes compressed air in the cylinder to hold the valve in place and keep it from dropping into the cylinder once the split collars and spring are removed.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the valve cover.
  4.  
  5. Remove the rocker arm/shaft assemblies.
  6.  

The cylinder must be on it's compression stroke in order to follow this procedure. The engine must therefore be turned slightly for each cylinder's valve seals.

  1. Remove the spark plug from the cylinder which is on it's compression stroke and install a spark plug air fitting adapter with an in-line gauge set between the adapter and air compressor. Apply compressed air to hold the valve in place.
  2.  
  3. Compress the valve spring using a suitable compressor tool and remove the split collars. Carefully release the spring tension, then remove the upper valve seat and the valve spring.
  4.  

If the air pressure has forced the piston to the bottom of the cylinder, any removal of air pressure will allow the valves to fall into the cylinder. A rubber band, tape or string wrapped around the end of the valve stem will prevent this.

  1. Remove the old seal using a suitable removal tool.
  2.  

To install:
  1. Install the new seal using the valve stem seal tool.
  2.  
  3. Install the valve spring and upper valve seat, then compress the spring and install the split collars.
  4.  
  5. When the valve springs are properly installed, release the air pressure from the cylinder using the gauge set, then remove the spark plug adapter.
  6.  
  7. Install the spark plug and turn the engine sufficiently to work on the next cylinder. Repeat Steps 4-11 until the seals are replaced.
  8.  
  9. Install the rocker arm/shaft assemblies and the valve cover, then connect the negative battery cable.
  10.  

Cylinder Heads Removed

The valve stem oil seals are replaced as a part of normal valve service any time the valve stems are removed from the cylinder head. Refer to the valve procedure in this Section for seal removal and installation when the cylinder head is removed from the vehicle.

 
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