Heat affecting Magneto
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=130067
Printed Date: 27 Apr 2024 at 5:48pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Heat affecting Magneto
Posted By: 10-E Chalmers
Subject: Heat affecting Magneto
Date Posted: 15 Oct 2016 at 11:06pm
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I have a 1938 B that I have a fresh rebuild on and she runs great, pulls well and does what I ask of her, never gets above 180, (175 usually)but after she's been running for about an hour or so, (say when I'm plowing) she'll just quit and won't start again until she's totally cooled down. She's getting good gas (new bowl etc., but no carb rebuild)the only thing I can figure is that the magneto is getting worn and needs a rebuild. Any ideas are appreciated! I thank you in advance, 10-E Chalmers "a closed mouth gathers no feet" |
Replies:
Posted By: Chalmersbob
Date Posted: 15 Oct 2016 at 11:26pm
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Sounds like your mag has the old asphalt covered coil and needs to be replaced. Did you check for spark after it quit? LOL Bob ------------- 4 B's, 1 C's,3 CA's, 2 G's WD, D14, D15, B-1, B10, B12, 712S, |
Posted By: Matt (Jordan,MN)
Date Posted: 16 Oct 2016 at 12:28am
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I agree with Bob. sounds like a bad coil. I can rebuild your mag or supply parts. Matt
------------- Owner of Matt Scott LLC Specializing in NOS and used Allis Chalmers tractor & implement parts & liturature and Magneto Repair http://www.mattscottllc.com/ |
Posted By: 10-E Chalmers
Date Posted: 16 Oct 2016 at 10:12pm
| I guess I didn't even think to test for spark afterwards, good call fellas, after harvest I'll be plowing some new ground and will have to test that theory. I'll take you up on the parts or rebuild too if it comes to that! |
Posted By: bigredisb
Date Posted: 17 Oct 2016 at 7:30am
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I had the same issue on my Farmall. It was a coil dying. ------------- 1961 Allis-Chalmers D15 1949 Farmall Super A |
Posted By: rtr
Date Posted: 17 Oct 2016 at 8:48am
What do you think? Any way to test the coil? I should have checked for spark.
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10-E Chalmers wrote:Posted By: 10-E Chalmers
Date Posted: 17 Oct 2016 at 9:51pm
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exactly what happens to me! She'll pop, but wont fire no matter how long I crank on her (and she's a hand crank only)if I pull her, she'll sputter until she fires, but once under load she'll die again, unless I let her cool down completely |
Posted By: rtr
Date Posted: 18 Oct 2016 at 7:59am
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I got mine running again. Not sure what it was. Put the battery charger on it for about an hour so the 6 volt would turn over good. Turned off gas to prevent flooding and pulled #1 plug wire to check for spark. Not the greatest spark but got it to "pop" while holding wire 1/2" from plug. Put it back on and she fired right up!! Such a weird situation. Is there a way to check the coil or check the magneto impulse?
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Posted By: Fred in Pa
Date Posted: 18 Oct 2016 at 8:12am
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Just pull it off and send it to a GOOD MAG guy ,will save you time messing around with it ,what's a few good bucks spent to make it run right .Guessing is of waste time . ------------- He who dies with the most toys is, nonetheless ,still dead. If all else fails ,Read all that is PRINTED. |
Posted By: ihscout
Date Posted: 18 Oct 2016 at 6:00pm
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I had that problem with my 41 B. Hand crank also. The coil was fine. Reset the points and replaced condenser. All works fine now ------------- '40 AC B - My Pappy always told me "Use your head for something other than a tack hammer!" I did. It makes a great 16 pound sledge hammer. |