H mag.

Hello, and HELP!!!! I have been trying to get my 1940 H started. I have had over 10 years and never failed. But, no start no spark. Put in new points and condenser put her back together and still no spark. So, got a coils and in my mind shouldn't be more that a 10 fix and back on. It seems that the armature has melted into one end of the coil. Never been into a mag until now. How can I fix this. Thank you ahead of time..Kenny

A mag coil is pretty easy to replace. if the magnet (rotating part) has scraped the frame. it might be cheaper to replace it. If it is turning on good bearings, no issue. A
ground strap, and a wire to the points/condenser is all. Jim

If I'm understanding you correctly, you want to install a new coil and the old one is stuck on the "core"?

If that's the case, carefully hacksaw the old coil off of the core, don't get rough, even thought core looks solid, it is actually made of laminated iron, riveted together, and then ground nice and smooth and round.

It's easy to destroy if you get at all rough trying to remove the old coil.

I have a solid core here I took out of a H 4 magneto that was on a H Farmall. Trying to get the picture up.

picture

Here's what they look like when roughed up a bit...



(Actual H4 coil core.)

This one is solid but I hate to cut it up just to prove it .

Maybe a homemade replacement?

No it is not home made. A lot of them were solid. I replaced many coils over the years.

I can work on it & fix it. I have a couple on hand ready to go.

How much money are we talking about with a swap vs repair of mine.

The coil will be easily fixed if I could get it loose on one side. Its like the coil is melted into /onto the side of the magneto? Not sure of the terminology. Holding the mag with the drive end facing you the coil is stuck to the left side of the magneto. Now, can I saw in between the cylinder that goes inside the coil and part that the screw fits through to tighten it all together? I hope I am making sense to someone because this dag gone thing is about to make me pull my hair out.........kenny

I dont pretend to know about magnetos, so please forgive my ignorance, but I had a similar thing happen to my H [battery start.] Turned out to be a worn-out distributor cap electrode. Very cheap to fix, but she would NOT start without a new cap. Very cheap and easy to fix. Just got a new cap.

$75 exchange.

Are you working with an actual IH H4 mag?

There's a screw through the steel laminations cast into the aluminum housing into each end of the coil core. With those two screws out I can't see how thew coil can be so stuck in there you can't yank it out of there with your bare (or better yet GLOVED) hands.

Got a photo?

Yes I am working on a H4 mag. It is on my 1940 IH H. The aluminum "casting" is welded/ stuck to the center piece inside the coil. I have yanked and pried on it until I am afraid I will break the durn thing. I am with y'all its a 5 minute fix that has litterly taken 2 hours and I am still no further ahead than I was before. Thanks for all the advice...........Kenny

This may be of some help…
First you need to check the serial number of your magneto. If it has a number below 71002, you may need a soldering iron to remove the coil. From 71002 up, no soldering iron is required.
The Magneto book says:
"The condenser (3) is located in the body of the magneto. To remove the condenser with the coil in place, first remove the grounding switch (1) by removing the screws (A). Next, bend the lock (7) away from the flat on the condenser terminal screw (8). The screw may then be removed with the lock and outer bakelite washer (6). Remove the coil cover and then remove the condenser clamp and screw (2). Then push the condenser back into the frame and remove the inner bakelite washer (5) and the two primary wires (9) from the condenser terminal. The condenser may now be lifted out by working it forward through the side of the magneto. To assemble the condenser into the magneto, reverse the above procedure.

The construction of the coil is very similar to that previously used on the F-4 and F-6 magnetos. To remove the coil,as described above. Then remove the condenser primary wire from the condenser terminal. The next step is to remove the soldered strip from the top of the pole piece. This strip is used as a ground wire. When applying the soldering iron be careful not to overheat the strip and loosen the joint inside the coil; also do not hold the soldering iron too close to the coil.
Important: Before lifting coil out, turn magnet to the neutral position or so pole of magnet bridges air gap between end of coil pole pieces!"

Magneto A requires a soldering iron to remove the core.
Magneto B does not.





SadFarmall

YES THATS IT!!! Thanks Sadfarmer. That's exactly what I have. THANK YOU THANK YOU THANK YOU!!!! for shareing the picture book and how to remove the coil.......Kenny