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Farmall & IHC Tractors Discussion Board

Re: Farmall M motor stuck


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Posted by Loren on May 16, 2002 at 12:33:32 from (209.150.202.19):

In Reply to: Farmall M motor stuck posted by Denny on May 15, 2002 at 18:50:18:

I've had good luck un-sticking pistons by using Iron Etch (made by Martin Seynour) which I purchase at NAPA. It's used for auto body work for preping metal. It's a bluish color, and I think the main ingredient is phosphoric acid. I broke loose pistons on a 10-20, A, and an M, and it's worked every time. I pour the solution into the cylinder about 1/2" deep on top of the piston, and let it sit overnight. The next day, put a bock of wood in the piston and start trying to drive it down. If you have help, another person can put a bar on the flywheel. Definitely take off the pan, so you can see the direction the crank should be turning, and you'll want to pull out the piston and clean up the cylinder anyway.

It's been a while since I did this, but I think I removed the rod bearing caps and swung the rods over to clear the crank pins, putting a rag or cardboard between the rods and the crank pins to prevent damage. With the M rods, the caps should be at 45 degrees to allow you to swing them out of the way. By doing this, you can work on each piston individually, in case several are stuck. After the rods are disconnected from the crank, try taking a wooden dowel and driving the pistons up from the crank case. The ones that are not stuck should come out. Also, with the crank disconnected, you can rotate it out of the way of the piston & rod you're woking on.

After you get the stuck pistons moving down, you may want to then oil the cylinder and drive it upward (can't remember if the piston will clear the crank if you keep driving it down.) You'll probably need to use a ridge reamer on the cylinders so the rings will clear the wear edge near the top of the cylinder. On the 10-20, the pistons had to be driven out the bottom because the bearing end of the rod is wider than the cylinder.

The Iron Etch will leave the cylinder with a rougher finish where it sat overnight, so you'll want to hone out the cylinder. E-mail me if I can be of further assistance.


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