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Farmall & IHC Tractors Discussion Forum
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Points and Condenser on M Farmall with Magneto

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Pat Bryant

09-01-2003 15:48:28




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Hi, I bought an M with a Magneto which is not firing. I plan to emory/file points to see if this helps. I have changed many points with battery ignition but not with a magneto. Whats the difference and why does the engine have to be TDC on # 1 cylinder I'm told. I'm down to taking the two screws out in front of the points which holds the distributor cap springs. Could some one walk me through this. Thanks, Pat

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Wayne Swenson

09-01-2003 20:01:48




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 Re: Points and Condenser on M Farmall with Magneto in reply to Pat Bryant, 09-01-2003 15:48:28  
Engine basics #1: To get the most benefit out of the air/fuel mixture the carburetor provides to the cylinders, spark must occur at the correct time.
When starting the engine, you do not want the spark to occur before top dead center (BTDC)because the piston could be forced down the cylinder backwards (not good on wrists if hand cranking!!). So, set the spark to happen just at top dead center (TDC) or slightly after top dead center (ATDC).
As the engine picks up speed (RPM'S) the magneto or distributor will automatically advance the timing the right amount.
The air/fuelmixture burns at about the same speed whether the engine is running fast or slow, so the spark has to happen earlier to fully burn the mixture when operating at higher RPM'S.

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Michael Soldan

09-01-2003 17:00:29




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 Re: Points and Condenser on M Farmall with Magneto in reply to Pat Bryant, 09-01-2003 15:48:28  
Pat, I just did this with my M a few weeks ago and got it running. I think by my experience that if you don't mess with things too much you can unbolt the mag, change the points and bolt it back in. After removing the mag there is the distributor and rotor to pull off. Next there are three screws holding a plate over top of the points and condenser, they can only go back on one way but marking the position of the plate with some yellow crayon will save you twisting and turning the plate till you get it right. I use fine emery cloth doubled over and positioned between the points and rub the cloth back and forth for several minutes..not only does this clean the points but it aligns the surfaces when the emery cloth is removed. I then just put everything back on the tractor as I took it off and the old M fired right up.Don't snap the mag over or don't turn the engine over when the mag is removed and thus it will go back in correctly. If youy have to time it you will find notches on the front crank pulley, there are two ways to time it..TDC or align the notch in the pulley to the mark on the block...the mag should fire as the piston moves from TDC...I've had to do this with the M three or four times in the last few years as I sometimes let it sit for several months..just clean up the points and I'm in business....good luck from Mike in Exeter Ontario

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