Bosch Mag on 1936 RC

Case35 · Feb 19, 2013

I recently aqquired a Case RC, and everything checked out okay, I changed fluids, and all that. I took the Bosch Mag off and it was very clean, I cleaned the points, and had good hot spark for a few turns, but I put it back on the tractor, and I only have spark on #1 & #4. Could anyone tell me what could be wrong? I dont really know a whole lot about these mags. Any help would be greatly appreciated! Thanks!

1031D · Feb 19, 2013

Does the impulse trip on all cylinders?

Case35 · Feb 19, 2013

Yes it does.

dc in illinois · Feb 19, 2013

I dont know about bosch but in the case #41 mag some times the springs and carbon points inside the cap get worn and weak.and this could case somthing like whats happing to you if it is the same on a bosch mag.and check the plug wires where they sit in the cap as these piont can be touchy. Bob

DKase · Feb 19, 2013

My first guess would still be the impulse. If it does not catch good enough it will not wind the spring tight enough to get a good spark while turning by hand. if it was mine I would belt it to another tractor, check out the oil pressure, clutch, compression,etc, and then turn the gas on to get it running. My guess is it will run fine once fast enough so the impulse is not needed.

Christopher Mikesell · Feb 20, 2013

I just went through an american bosch mag similar to the one that came on the RC cases. The only things that I can think of in order of likleyhood are, worn carbon brushes, way too small of a points gap (breaking on one lobe and not the other, a rusty spot on the cam eating away at the points rubbing block will cause this).
How did you test for spark? Was the mag installed on the tractor? Your ground to the engine may be poor. Also, resistor plug wires can make a spark poorer.

Bosch Mag on 1936 RC

Case35

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1031D

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Case35

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dc in illinois

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DKase

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Christopher Mikesell

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