UM674PK (Tempest)

Aero Accessories currently offers copper mounting gaskets in bags of 100 (TEMPEST®   part number UM-674PK) for TEMPEST® Aviation Spark Plugs or competing brands. Always use new spark plug gasket (UM-674) when installing a new plug or re-installing a reconditioned plug.

Copper mounting gaskets (TEMPEST® part number UM-674) are engineered to ensure proper sealing and firing tip location of a TEMPEST® Aviation Spark Plug. Aero Accessories recommends that a new copper gasket be used every time a spark plug is removed. Only one gasket per plug should be used. With correct installation, the firing end of the plug is flush with the combustion chamber wall. This prevents threads from being exposed to combustion gases and developing hot spots which may lead to preignition. To ensure the firing end of the spark plug is flush with the combustion chamber wall always install a long reach plug in a cylinder designed for long reach plugs and a short reach plug in a cylinder designed for short reach plugs. A gas leak at the gasket interface may cause higher-than-normal operating temperatures, again possibly leading to preignition. Prevent this possibility by using a new copper mounting gasket each time the spark plug is removed.