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Tractor Talk Discussion Forum

American Bosch magneto cam placement

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H Mike

12-14-2006 14:40:03




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The mag is a Bosch MJB4A-308 on a 1935 Case. The rotation of the points braker cam is counter clock-wise. At the bottom of the cam are two notches and one keyway,which way does it belong?




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Glen in TX

12-14-2006 15:33:37




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 Re: American Bosch magneto cam placement in reply to H Mike, 12-14-2006 14:40:03  
Line up the notch marked "C" on cam with woodruff key on shaft. Why? Because all Case mags would be a CW, clockwise rotation facing the drive end of mag so the C on cam alines with keyway. The "A" on cam is for a CCW, Anti-Clockwise drive mag. The later Bosch mags are reversible on rotation and you find marks A & C on cam, distributor rotor and impulse parts for that reason. To determine any magneto rotation you go by facing drive end of mag and which direction it turns when impulse trips not the other end.

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Glen in TX

12-14-2006 15:35:22




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 Re: American Bosch magneto cam placement in reply to Glen in TX, 12-14-2006 15:33:37  
Also the distributor rotor mark C will aline with the keyway to time rotor.



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