Champion CT-482 spark plug erosion gauge provides
an easy, accurate method of determining whether your plugs have reached
their maximum wear limit. Simply regap the used plug to .016 nominal,
then attempt to insert electrode assembly through the chamfered hole in
the gauge, as shown. Penetration of the hole
by the electrode assembly indicates plug has exceeded its recommended
wear limits and should be replaced.
The CT-482 is calibrated to reject plugs after their
electrodes have eroded to at least 1/2 their original thickness. Although
aviation spark plugs will continue to fire past this wear point, the rate
of electrode erosion will increase as a result of non-parallel gaps and
reduced sparking area. This leads to intermittent misfire, increased ignition
system wear, and possibly costly unscheduled maintenance. |