freeze plug on M

e-manhunt · Jul 14, 2011

I never heard of this until recent posts. I have a 1940 M.
What does a freeze plug do?
Where is it located?
how do you remove it or replace it?
Thanks, always trying to learn.

E.

sflem849 · Jul 14, 2011

In design, they push out of the block if it were to freeze to eliminate damage to the block.
Their number and location vary by year. Somebody smarter will tell you the exact location and number on your '40.
You can pry them out. They are just a press fit. You clean the area and tap the new one in. Some guys put sealer stuff on them.

rustred · Jul 14, 2011

no frost plugs on that engine.
an example would be on the 560 engine, they are located on the right side of the block about in the middle.

D Slater · Jul 14, 2011

Freeze plugs are what they are called a lot, but not the best name. Could be wrong but think the holes have more to do with the casting process than anything. Openings to install or remove casting sand. Most blocks will crack when froze reguardless of the plugs.
Location on M blocks is in the ends, front and rear engine parts or plates are removed to access plugs. There's a engine serial number break when the plugs were no longer used. Sometime in september 1944 for M engines in M tractor.

Wardner · Jul 14, 2011

Freeze plugs aren't designed to relieve a casting from expanding ice pressure. Of course, they can do that but a severely frozen casting will have areas that distort anyway.

They are actually core holes where the cores penetrate to the exterior. The exterior portion of those cores rest in pockets that support and locate the core. Those pockets are called core prints and are preformed with the pattern.

A core is used to prevent metal from occupying the space where it is used. If you take something simple like a water outlet, you can see where the core goes. The core will have extensions that fit into a core print.

rustred · Jul 14, 2011

it seems like the blocks crack because the frost plugs get so rusted in that they cant pop out. forgot to drain the block on my 660 and 1 plug popped out and all is well, so they do work.had the rad drained though so maybe that had something to do with it not cracking the block. they should be installed with a lube so they dont rust up.

e-manhunt · Jul 14, 2011

Frankly, i never thought of the block freezing enough to crack. How the heck should i winterize the thing if I let it sit all winter - or heck even for a week where it gets down to -30 on a regular basis?

sflem849 · Jul 14, 2011

(quoted from post at 12:42:00 07/14/11) Frankly, i never thought of the block freezing enough to crack. How the heck should i winterize the thing if I let it sit all winter - or heck even for a week where it gets down to -30 on a regular basis?

antifreeze

IndianaRed · Jul 14, 2011

If you have the right mixture of antifreeze, your block won't crack. Usually happens when too much water is in the cooling system. Freezes, turns to ice, cracks the block.

Someone else said the M's don't have freeze plugs, so you're problem is solved.

Be careful on that tractor, sounds like you don't have a lot of experience with them.

pete 23 · Jul 14, 2011

You may or may not have "freeze" plugs in that M. If original block it will have one under the front cover that can leak coolant into crankcase and one behind rear plate that can leak to outside of block. I have replaced several over the years, usually during routine engine overhaul. Like someone else said, they quit them in about 1944 production.

freeze plug on M

e-manhunt

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sflem849

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rustred

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D Slater

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Wardner

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rustred

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e-manhunt

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sflem849

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IndianaRed

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pete 23

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