erich weaver
Well Known Member
Something to be aware of: Twice in the last year I have had to replace one of the leads between my pmags and my automotive sparkplugs. In both cases, the very small band that is attached to the metal retention clip that attaches to the sparkplug tip had broken. This piece is what causes the retention clip to produce an audible pop when it latches onto the sparkplug tip and prevents it from working its way loose. You cant see that its broken by looking into the rubber boot on the sparkplug lead; the retention clip has to be removed from the rubber boot, at which time the broken band falls out in two very small pieces.
Next time you have the cowl off, check the sparkplug lead connections. If you do not hear a distinctive pop when you push the rubber boot down onto the sparkplug, you do not have a good connection and will likely soon see signs of trouble, like elevated EGT and lowered CHT relative to normal on that cylinder. Also, you wont see an EGT increase on that cylinder during the runup mag check for the pmag with the bad lead.
regards,
Erich
Next time you have the cowl off, check the sparkplug lead connections. If you do not hear a distinctive pop when you push the rubber boot down onto the sparkplug, you do not have a good connection and will likely soon see signs of trouble, like elevated EGT and lowered CHT relative to normal on that cylinder. Also, you wont see an EGT increase on that cylinder during the runup mag check for the pmag with the bad lead.
regards,
Erich