Mag Resistance - Farmall A 1941 Manual Start

gdtractor · Sep 3, 2014

Been working on my Farmall A mag .. I had to file the points .. lots of "metal" left on points .. polished up all connections ..
I noticed after I put it back together and turning it to see if the "snap" had fire .. it turned harder than I remember before ..
It does have SPARK .. good spark !!
Doesn't seem to have anything wrong with it but noticed turning mag with my fingers it seemed hard .. it "snaps" good .. and has good spark now ..
My question is ... is this normal .. not sure how to describe the torque pressure .. but maybe 25 - 30 lbs [just a guess] .. hard to do with thumb and one finger ..
Thanks ..

Gdtractor

gene bender · Sep 3, 2014

Thats the way its supposed to be. Does the rotor line up with the tower when it snaps. Recomend to soak the drive end in kerosene or diesel fuel to clean the impulse drive then blow with air to make sure its clean. This is to remove any buil-up of dirt,grease ect. Did you remember where the rotor was pointed when you removed it as you will be in time or 180 out.

John T · Sep 3, 2014

The tighter the spring (more energy it stores from winding), the faster it makes the rotor spin when its released,,,,,,,,,and the faster the rotor spins the more spark energy. If it snaps with a faint dull clunk that's a weak spring but if its a loud sharp SNAP that's better.
John T

gdtractor · Sep 3, 2014

Thx .. yes .. it is a sharp snap !!

gdtractor · Sep 3, 2014

Thx !!
and NO .... I forgot to mark the rotor .. so going to have to do the "finger over #1 cylinder again" .. and adjust accordingly ..
I could kick myself for forgetting that ..
But I know where it is "supposed to be" ..
Thanks ..
Gary

gdtractor · Sep 3, 2014

Thanks much

gdtractor · Sep 3, 2014

.. when I cleaned the mag ... I forgot to mark the position.. butI polished up all connections .. I noticed after I put it back together the pressure stroke on #1 cylinder that the rotor now pointed to the postion where #3 was so I put #1 plug wire there .. and then clockwise went with the firing order.. 1 3 4 2 Got a REAlly GREAT spark now!!! But haven"t tried it yet .. hoping it will work . Gary

gdtractor · Sep 3, 2014

Here is a video of the tractor running - after many years of sitting outside under a tarp ..
still needs some TLC .. on pushrod [not bent but sticking .. ] This start was from cranking not pulling ..
http://youtu.be/cNjK3xj89o0

Thanks for your help!!

Gary

Mag Resistance - Farmall A 1941 Manual Start

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