37 AC WC Mag

The FM RV and many other mags use E15 magneto thrust type bearings. Those have to be shimmed properly for a preload endplay of .001-.002". If the rotor is too loose it can rub and you will get erratic firing or no fire at all. The earlier cobalt magnets in the RV could need recharging and that is done on a magnet charger with blocks for the purpose. They did put Alnico magnet rotors in some later RV mags and those should keep their charge better but can use a recharge also if the rotor bearings are loose and let the magnet rub inside housing. That will cause it to loose charge. Old style coils and condensers are famous for being bad in those RV mags because of their age and insulation breakdown inside. Replacements or rewinds are available also with a few other new parts such as gaskets and seals and some impulse parts. Other parts would be available NOS only for the RV mags. If you need magnet recharged or testing email me.

• FM RV mags