pieces of rubber are missing or if the elastic
member is more than 3.18mm [1/8 inch] below the
metal surface, replace the damper.
Also look for forward movement of the
damper ring on the hub. Replace the damper
if any movement is detected.
lubricating oil carry over which lubricates the
piston rings and moving parts. When this
lubricating oil is exposed to normal air
compressor operating temperatures over a
period of time, the lubricating oil will form
varnish or carbon deposits. If the following
piston rings will be affected by high operating
temperatures and will not seal correctly.