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Fordson F mag test

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will@ont.ca

10-11-2002 15:03:01




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I'am rebuilding a 1918 fordson F and at this point with the head and oil pan off I was wondering if I'am able to make sure the magneto is ok.Is there a way to test it to see if it's hot?? Thanks!!! Will




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ADAM

10-15-2002 20:11:17




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 Re: fordson F mag test in reply to will@ont.ca, 10-11-2002 15:03:01  
Use a digital voltmeter and clip one end to the stud on the left side of the flywheel housing, ground the other. by briskly flipping the crank over (1/2 turn) you should get 4-6 volts on your meter. if not i would reccomend removing the engine and charging your flywheel magnets, this makes starting very easy.



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DAVE

10-16-2002 07:59:02




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 Re: Re: fordson F mag test in reply to ADAM, 10-15-2002 20:11:17  
What is the best way to charge the magnets
if the voltage is too low? I have a 1922 F
with low voltage.



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ADAM

10-16-2002 20:29:20




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 Re: Re: Re: fordson F mag test in reply to DAVE, 10-16-2002 07:59:02  
The best way is to remove each magnet from the flywheel, charge them individually and then reassemble the flywheel. here is where it gets tricky, the magnets all have to be re-alighned so they are all flush. there is a tool used to do this and also set the gap between the stationary stator and the flywheel. it is not a job for the person that has limited tools and expertiese.

the other way, might not be the correct way is place the stator on the flywheel ( with out removing the magnets ) with the North and South poles lined up accordingly. hook up several car batteries together in series and run some current thru the stator, this will recharge the magnets. the benefit of this method is that you dont have to re-align the magnets.

I perfer the first method, is more effective. would only do the latter in a pinch.

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DAVE

10-17-2002 03:06:49




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 Re: Re: Re: Re: fordson F mag test in reply to ADAM, 10-16-2002 20:29:20  
THANKS FOR THE INFORMATION. IT LOOKS LIKE A TEAR
DOWN EITHER WAY.



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Will@ont.ca

10-16-2002 02:46:32




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 Re: Re: fordson F mag test in reply to ADAM, 10-15-2002 20:11:17  
Thanks Adam,I'll split her as it's easy at this point.!! Will



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Theman

10-16-2002 07:32:44




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 Re: Re: Re: fordson F mag test in reply to Will@ont.ca, 10-16-2002 02:46:32  
Will, the voltage you are reading will actually be AC. The pickup coils alternately see the positive then negative poles of the magnets as they spin by. You will better understand that after you remove the flywheel. I hooked my running '23 F to a scope meter and saw some odd looking waves on the display. Ignoring the momentary spikes to ground when the points closed, the voltage output at idle was 12 to 13 volts.

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