While taxiing to the run up area I got a way high CHT reading on #1 while all others were nominal. During run-up I found the plug on #1 fired by the left mag did not work ? EGT went south. So it was back to the barn.
Bad plug is at the bottom of the cylinder. Wires from the CHT sensor were rubbing against the plug wire. I could see copper colored wire on the braid around the plug wire. I could not see defects in the CHT sensor wire.
I replaced the plug which did not look that bad. I made a spacer to keep the wires apart. I have not run the engine as I just ran out of time this afternoon.
I do not know the function of the braid around the plug wire. Is it reasonable to think this chaffing could cause both problems?
Thanks for the help
Roy Samuelson
RV7A at OAK
New Lyc O-360 Lasar ignition
Bad plug is at the bottom of the cylinder. Wires from the CHT sensor were rubbing against the plug wire. I could see copper colored wire on the braid around the plug wire. I could not see defects in the CHT sensor wire.
I replaced the plug which did not look that bad. I made a spacer to keep the wires apart. I have not run the engine as I just ran out of time this afternoon.
I do not know the function of the braid around the plug wire. Is it reasonable to think this chaffing could cause both problems?
Thanks for the help
Roy Samuelson
RV7A at OAK
New Lyc O-360 Lasar ignition