Super A magneto problem

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Super A magneto problem

Postby havoc1482 » Wed Apr 02, 2014 8:08 pm

So. Tractor was running great until I left it out in the rain for about 3 days. After that she wouldn't fire. I figured something that got wet that wasn't supposed to. I narrowed it down to a weak spark, so something was clearly wrong in that area. I popped the distributor cap off to check it, didn't notice much, cleaned it anyways. I then took the rotor cap and nudged the center of the arm a wee bit out (so it would be closer to the center point on the cap) and It fired right up. It was running just fine for about 1 minute, then it shut off, I had the gas off, oops haha. So I turned the gas on and she fired right back up again. After that the tractor ran for about an hour until I finally shut it down. I went to start it again and nothing. She just turned and turned and turned. I pulled the cap off again and found little metal shreds all over the inside. They were around the entire inside, like the rotor decided to machine the center of the cap. Could this be solved by just getting myself a new cap/rotor? I also noticed the arm on the rotor had a small crack on that little rivet thing that holds it on, could that cause a problem?

I think its having poor contact with the center point on the cap.

I think I have the H4 magneto, but I'm not sure.
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

Jengland923
Posts: 12
Joined: Sun Mar 30, 2014 8:11 pm
Zip Code: 37779

Re: Super A magneto problem

Postby Jengland923 » Wed Apr 02, 2014 9:43 pm

Sounds like maybe cap and rotor

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
501 Club
501 Club
Posts: 21534
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Super A magneto problem

Postby John *.?-!.* cub owner » Wed Apr 02, 2014 9:46 pm

The center of the cap should have a little carbon button that sticks out for the rotor to contact in the center. I suspect yours broke off or wore off. You need to also check the rotor to see if it has a smooth spot where it contacts that carbon button or if it has worn through and is cutting it up. It does not want much pressure where it contacts that button.
If you are not part of the solution,
you are part of the problem!!!

User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Re: Super A magneto problem

Postby havoc1482 » Wed Apr 02, 2014 11:49 pm

John *.?-!.* cub owner wrote:The center of the cap should have a little carbon button that sticks out for the rotor to contact in the center. I suspect yours broke off or wore off. You need to also check the rotor to see if it has a smooth spot where it contacts that carbon button or if it has worn through and is cutting it up. It does not want much pressure where it contacts that button.


Thats what I figured. The carbon button looks fairly okay, but the spring seems to have lost its "springyness". The carbon button doesn't push out as far as it can go. I'm probably just gonna replace both parts. I assume I have the H4, but how can I know for sure? I just don't wanna pull the trigger on parts that won't fit right. I already did that once lol.
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

User avatar
Rick Spivey
Cub Pro
Cub Pro
501 Club
501 Club
Posts: 1934
Joined: Sun Jul 01, 2007 10:07 pm
Zip Code: 29681
Circle of Safety: Y
Location: SC, Simpsonville 29681

Re: Super A magneto problem

Postby Rick Spivey » Thu Apr 03, 2014 10:49 am

It will have "H4" stamped into the serial number. Post a picture and we will tell you for sure.
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)

User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Re: Super A magneto problem

Postby havoc1482 » Thu Apr 03, 2014 1:53 pm

First 3 photos are my tractor, the last one is a google image of what it looks like.

Image
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

User avatar
Rick Spivey
Cub Pro
Cub Pro
501 Club
501 Club
Posts: 1934
Joined: Sun Jul 01, 2007 10:07 pm
Zip Code: 29681
Circle of Safety: Y
Location: SC, Simpsonville 29681

Re: Super A magneto problem

Postby Rick Spivey » Sun Apr 06, 2014 5:15 pm

Yes, you have an H4 magneto.
Rick Spivey
'52 Cub ("Great Personality") 148xxx
'48 Cub with FH ("Gunny Cub") 38xxx
'57 Lambretta (a slow work in progress)
'74 Triumph TR6 (Mama's toy)

User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Re: Super A magneto problem

Postby havoc1482 » Sun Apr 06, 2014 5:20 pm

Rick Spivey wrote:Yes, you have an H4 magneto.


Figured, thanks! New parts on the way. Hopefully it will remedy the issue.
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

User avatar
CPIII
5+ Years
5+ Years
501 Club
501 Club
Posts: 669
Joined: Wed Sep 30, 2009 9:43 am
Zip Code: 77355
eBay ID: czechiii
Tractors Owned: 48 Cub SN 54XXX (Captain Crunch)
47 Farmall A (Patches)
Circle of Safety: Y
Location: Magnolia, Texas

Re: Super A magneto problem

Postby CPIII » Mon Apr 07, 2014 12:29 pm

I had a similar problem on my cub. and the problem turned out to be a cracked insulator for the kill switch screw. The insulator had a hairline crack and it would short just enough when it rained to allow an inconsistent\weak spark. I don't have a drawing for the H4 but the part shown below was for the J4. But there has to be a similar insular for the H4.

Kill Swtich Insulator.JPG


I found the same part for the H4 is is 51A or 51 in the diagram below:
H4 Kill Switch Insulator.JPG
You do not have the required permissions to view the files attached to this post.
Charles Patek III
Some days - Chicken.......Some days - Feathers
Words to live by....

User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Re: Super A magneto problem

Postby havoc1482 » Tue Apr 08, 2014 7:23 pm

Awesome thanks. The coil cover gasket was ripped and shredded so hopefully the new one I got will stop the water next time.
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Re: Super A magneto problem

Postby havoc1482 » Thu Apr 10, 2014 12:23 pm

Yeah, so something isn't quite right, I think I have a grounding/short issue here, I have ZERO spark. I think I'm gonna have to pull the magneto off, and take a more thorough look. I have a question, if I remove the magneto, will I have to re-time it after? And If I do, should I follow this?: http://www.yesterdaystractors.com/articles/artint7.htm
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Re: Super A magneto problem

Postby havoc1482 » Thu Apr 10, 2014 10:03 pm

Found the problem. Bad gaskets + rain for 3 days =

Image

Yep, water in the points housing.
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
501 Club
501 Club
Posts: 21534
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Super A magneto problem

Postby John *.?-!.* cub owner » Fri Apr 11, 2014 12:17 pm

Usually moisture in the points housing will not stop a spark, unless it was standing in puddles in there. However, if the moisture got inside the coil housing, that is another story. My loader cub sets under a lean too on the side of my shed, and I keep a layer of bubble wrap plastic over it, held in place with reusable cable ties. Makes it much easier to start in high humidity, or just after a rain or even early in the morning before the dew has dried good.
If you are not part of the solution,
you are part of the problem!!!

User avatar
havoc1482
501 Club
501 Club
Posts: 973
Joined: Fri Sep 20, 2013 11:17 am
Zip Code: 01034
eBay ID: havoc1482
Tractors Owned: _______ 1948 Farmall Super A
Circle of Safety: Y
Twitter ID: @havoc1482
Location: Granville, MA

Re: Super A magneto problem

Postby havoc1482 » Fri Apr 11, 2014 12:27 pm

Well I can tell you John, it was more than a little moisture lol. The cavity was filled up halfway. There probably is also water around the coil too. Any tips for drying it out short of tearing the entire thing apart?
Mike
Image

I bleed Black & Gold

IH Collectors Club New England (Chapter 18)

Western Mass. (The 413)

User avatar
John *.?-!.* cub owner
Team Cub Guide
Team Cub Guide
501 Club
501 Club
Posts: 21534
Joined: Sun Feb 02, 2003 2:09 pm
Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
Location: Mo, Potosi

Re: Super A magneto problem

Postby John *.?-!.* cub owner » Fri Apr 11, 2014 10:46 pm

Lay it outside on a nice warm sunny day, or if you have a dehumidifier turn it down to 35% and set it over the vent.
If you are not part of the solution,
you are part of the problem!!!


Return to “Farmall A, Super A, AV, 100, 130 & 140”

Who is online

Users browsing this forum: No registered users and 0 guests