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Farmall & IHC Tractors Discussion Forum
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47 MD Magneto

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pvia

03-20-2008 10:19:02




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Hello, I installed the original mag and followed the manual instructions. I turned it over by hand to #1 TDC and then pulled the mag back from the mount and the impulse snapped just like the book says it is suppose to. The tractor fired right up. The next time I went to start it it would sputter for a few moments and quit. I rolled it by hand back up to #1 TDC and pulled the distributor cap off and the rotor was between the #2 and #1 posts and not lined up with the #1 post anymore and did not snap when removed from the mount. I also noticed after the mag was removed and turned by hand that there was very little spring tension from the impulse for the #2 cylinder, it had tension on all 4 of the cylinders when I installed it. The other cylinder firing locations have good tension. If the impulse has gone bad for the #2 cyl will it affect the overall timing. When I installed the 12volt distributor from my SMD in it she fired right up. Any ideas as to what is going on here? Thanks, Phil

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pvia

03-20-2008 18:49:08




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 Re: 47 MD Magneto in reply to pvia, 03-20-2008 10:19:02  
I thank you all for your help. Phil



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gene bender

03-20-2008 12:51:52




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 Re: 47 MD Magneto in reply to pvia, 03-20-2008 10:19:02  
When you get to TDC the mag fires. Next time pull the plugs so it turns easy then when turning over with the crank you can see when the mag rotor lines up and gires. Mark a place on the mag where the towers are then as you turn it over with the crank you will see it line up and get ready to fire. Now you mite have the rotor off a tooth of so. You can turn the mag over without being in the tractor that way you will see if the rotor is lined up with the cap.

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Nebraska Cowman

03-20-2008 10:33:33




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 Re: 47 MD Magneto in reply to pvia, 03-20-2008 10:19:02  
I'd guess you may have a clockwise mag. The MD uses a counterclockwise. That is looking at the drive end.



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pvia

03-20-2008 11:07:25




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 Re: 47 MD Magneto in reply to Nebraska Cowman, 03-20-2008 10:33:33  
No, it is the correct mag for the diesel. It rotates counter clockwise. Thanks



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Janicholson

03-20-2008 11:19:41




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 Re: 47 MD Magneto in reply to pvia, 03-20-2008 11:07:25  
The timing gears in the mag may be faulty, or the impulse trigger (sear) may be rounded. It might be fixable. Google Magman to find a repair possibility. JimN



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