anti seize on spark plug insulator.

[Marauder]

I was taught by an old time radial engine mechanic (he changed hundreds of plugs a week) to use clean engine oil on the threads. I dip a drop on my finger tip and roll the plug one time to spread it around. I've been doing this for 55+ years and never had a plug stick coming out. I clean the threads with a wire brush before hand. My Tempest massives have 750 hrs on them and are working just fine. 
I think too many plugs get changed way too early. Look at 43.13 on spark plug wear and see how far they let it go. 

Timely discussion. I recently had two Champion spark plugs fail on the same cylinder. I originally thought I had replaced them 946 hours ago, but saw that I did in fact replace them at 500 hours. That meant they failed with 446 hours on them. I am waiting for the new harnesses to arrive and will be replacing all of the Champion massives with Tempest fine wires. When I pull them, I will check the wear and report the resistance on all of the remaining ones.

One of the two that failed had a resistance of over 3.7M ohms!


Sent from my iPad using Tapatalk