7AC Continental A65

[Rattler 1]

Can anyone tell me the thread size of the spark plug hole? I'm trying to order a CHT gauge. It can come with a 14mm or 18mm sender which replaces the spark plug washer. I'm trying to do this without running to the airport to take one out and measure.

Thanks

 

[Bob Turner]

No, but you do realize that such sophisticated stuff should probably not be installed on a lawnmower engine?
Standard aircraft plug size - very few engines use any other size.
I’ll google it for you tomorrow if nobody knows from memory.

 

[Hiperbiper]

18mm

 

[Rattler 1]

18mm

Thanks, that's what I thought but wanted to make sure.