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Mag Problem Fixed. THANKS GUYS!
I put this message orginally at the bottom of the old thread but then I thought that no one may notice it so here it goes again...
I want to thank all of you for your advice on this one...Chris, the crayon idea worked great.
I started it up and switched to the left mag where the problem was. Let it run for about 5 minutes and the crayon melted on all the stacks except for the left front cylinder. I pulled the left bottom plug and switched it with the top one and believe it or not the left mag still checked bad. The plug had looked fine but I cleaned it up anyway. We had a wire tester and tested the wire from the mag to that plug and it checked good. We then discovered though that the wire coming out of that mag was probably a half inch up from the bottom of the cap. The mag had the points changed back at the annual 22 hours ago and I can only guess that the wire was never put all the way back into the mag and it must have been arcing all that time and it finally just decided to stop.
Anyway, here is the part that really freaked us out. We left the bottom cowl off and used some bungee cords to make sure the top cowl wouldn't flap and the nose piece wouldnt hit the prop while the engine was running. We started it up and the left mag was now fine but the Right one was rough!!! It turned out that the nose cowl due to the bungees pulling it back was grounding out the left top plug! Anyway, once we discovered that problem we put everything back together and it ran perfect.
Thanks again for the advice since that enabled us to find the dead cylinder without pulling all the plugs.
Make sure those wires are all properly inserted into your magnetos!!!
__________________
Tom Gilbertson
Cranford, NJ
'46 BC-12-D
N95716
I want to thank all of you for your advice on this one...Chris, the crayon idea worked great.
I started it up and switched to the left mag where the problem was. Let it run for about 5 minutes and the crayon melted on all the stacks except for the left front cylinder. I pulled the left bottom plug and switched it with the top one and believe it or not the left mag still checked bad. The plug had looked fine but I cleaned it up anyway. We had a wire tester and tested the wire from the mag to that plug and it checked good. We then discovered though that the wire coming out of that mag was probably a half inch up from the bottom of the cap. The mag had the points changed back at the annual 22 hours ago and I can only guess that the wire was never put all the way back into the mag and it must have been arcing all that time and it finally just decided to stop.
Anyway, here is the part that really freaked us out. We left the bottom cowl off and used some bungee cords to make sure the top cowl wouldn't flap and the nose piece wouldnt hit the prop while the engine was running. We started it up and the left mag was now fine but the Right one was rough!!! It turned out that the nose cowl due to the bungees pulling it back was grounding out the left top plug! Anyway, once we discovered that problem we put everything back together and it ran perfect.
Thanks again for the advice since that enabled us to find the dead cylinder without pulling all the plugs.
Make sure those wires are all properly inserted into your magnetos!!!
__________________
Tom Gilbertson
Cranford, NJ
'46 BC-12-D
N95716
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