Champion RHM40E Massive Electrode Spark Plug, 3/4"-20 Thread
Champion Aviation Ignition Plugs are manufactured within all military and commercial standards established for aviation spark plugs. All plug types are designed to meet specific engine and aircraft requirements for thread size, reach, heat rating, shielding and terminal connection.
Important Ordering and Installation Information
Aircraft Spark Plug Maintenance
- No COD's on Spark Plugs.
- All spark plugs come in factory sealed tube containers.
- Please check plug application before opening!
- We cannot accept returns on opened or installed plugs.
It is normally recommended that spark plug gaps and deposit conditions be checked at 50 hour intervals. In addition, removal time specifications are usually available from the manufacturer and may be supplemented by past experience with a particular engine model.
Checking spark plug gaps and deposits at appropriate regular intervals is crucial to preventing engine misfires.
Aircraft Spark Plug Gaskets
Aviation Spark Plug Gaskets are manufactured to precise dimensions and material standards, based on the effective reach of a spark plug as determined by its installed thickness. An ideal installation has the firing end of the plug flush with the combustion chamber wall with no exposed threads on the plug or the cylinder bushing. Exposed threads can become hot spots initiating preignition. Use and installation of proper gaskets are essential to reliable engine operation. Double gasketting a spark plug or use of non-standard thin gaskets will expose threads, contributing to engine-damaging preignition. Use new copper gaskets to ensure a tight, gas-sealed spark plug.