Quote:
Originally Posted by Ultramaroon
Not necessarily. I'd inspect and decide then. Likely just clean threads and reinstall. Think about your periodic aircraft engine inspection. Those plugs are expensive. Every decent A&P mech has a plug cleaning sandblaster. At least they did forty years ago.
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True. I saw the plugs that were removed when they did the valve spring replacement. After 100K miles, they still looked 85%. Since they basically replaced them for material costs though I had them go ahead and do them.