today I was trouble shooting my bendix s4ln-20 right mag that was not working. I suspected a bad coil or bad capacitor but figured i would first take the mag apart and clean everything and then retest; I did this and still had a dead right mag. next up I decided to swap the capacitor and coil from my good left mag and install them into the right mag; this also left me with a dead right mag. so I decided to disassemble the right mag one last time and reinstall the original coil and capacitor and send the mag off to be inspected. i reassembled the right mag with the original capacitor and coil and decided to give it one more go out of frustration. low and behold i now had a working right mag and a working left mag. i was so happy until i went to sit down at my work table where i had done all the disassembly today on the mags and noticed i forgot to install the carbon brush onto the right mag that goes on the distributor gear; this carbon brush touches the high terminal on the coil. this got me thinking how the mag could possibly operate without this carbon brush in place. i reinstalled the carbon brush on the right mag and low and behold the mag is totally dead again. i have been able to replicate this twice today. any ideas what is wrong with my carbon brush that could cause this. sorry in advance, my shift key and cap lock keys are dead on my computer; hence the lack of proper punctuation.
I've attached the manual for this mag for anyone interested in seeing the part in question. It is part# 72.
http://hhh.gavilan.edu/hspenner/Main...-20Magneto.pdf
thanks,
bill
I've attached the manual for this mag for anyone interested in seeing the part in question. It is part# 72.
http://hhh.gavilan.edu/hspenner/Main...-20Magneto.pdf
thanks,
bill
Last edited: