Part of Lesson Plan: **Remove and Replace a Valve (updated) by Steve Nagle

Activity Overview / Details

   After removing the valve spring, keepers/ locks and retainer, remove the valve oil control seal.  On GM products this seal consists of a small rubber "O" ring located just under the groove where the valve locks rest.  With other applications, there is a rubber umbrella seal on the stem resting near the cylinder head.

Before attempting to remove the valve, inspect the valve tip.  If there is a mushroomed area on the tip, remove it with a fine file.  Inspect the keeper/lock grooves as well.  Burrs in this area can damage the valve guide if not smoothed before removing the valve.  If any roughness is present, smooth with emery cloth.

When any burrs or roughness is removed the valve should slide easily down and out of the cylinder head.