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M freeze plugs

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Haybaylor

02-03-2007 14:39:18

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I got about 3 quarts of anti-freeze / water in the crankcase. Does this mean the block is cracked or are there freeze plugs somewhere that let go. Thanks.

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Cedric

02-05-2007 00:54:28

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Re: M freeze plugs in reply to Haybaylor, 02-03-2007 14:39:18

The H and 4 Series engines also have these plugs, 2 at one and 1 at the other. Will have to lift the engine out of my W-4 to replace a leaking one. I think these holes in the block were to make it easier to clear the core sand out of the water passages after the casting came out of the mould. Sid.

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PerryPaSteve

02-04-2007 16:44:59

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Re: M freeze plugs in reply to Haybaylor, 02-03-2007 14:39:18

Do any of the MDs have this freeze plug?

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El Toro

02-04-2007 07:31:52

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Re: M freeze plugs in reply to Haybaylor, 02-03-2007 14:39:18

I would have the head magna-fluxed for cracks if a new gasket doesn't stop the leakage. Hal

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CNKS

02-03-2007 14:45:24

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Re: M freeze plugs in reply to Haybaylor, 02-03-2007 14:39:18

Could be, or if you are lucky, no. -- check the head gasket first, then the head. I think all the freeze plugs open to the outside.

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460anger

02-03-2007 16:01:15

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Re: M freeze plugs in reply to CNKS, 02-03-2007 14:45:24

There is a soft plug behind the timing cover plate on the front of the engine. They are known to rot out. Bad thing is, you have to tear the whole front of the motor to get to it. I usually take the oil pan off, lay a piece of cardboard under the motor, make sure it's full of antifreeze, if it drips from the very front it's that soft plug. But, also could be the head. Good Luck!

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CNKS

02-03-2007 19:09:50

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Re: M freeze plugs in reply to 460anger, 02-03-2007 16:01:15

I should not have made that statement. There could also be one at the rear of the engine covered by the rear cover/engine support. My parts book says a total of 3, for SN #'s 501-82498, or 1939-early 1945.

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John M

02-03-2007 17:56:23

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Re: M freeze plugs in reply to 460anger, 02-03-2007 16:01:15

That soft plug is not on all M engines. I have one with, two without, and one block sitting out that "had' one in it.

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D Slater

02-03-2007 19:01:21

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Re: M freeze plugs in reply to John M, 02-03-2007 17:56:23

Think sometime in 1944 they stoped having it.

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John M

02-04-2007 05:45:46

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Re: M freeze plugs in reply to D Slater, 02-03-2007 19:01:21

I think youre right.Neither of my 41s have them, but they both have later IH repalcement engines.My 40 does, and the block I have is off of one of my 41s,which does.

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John M....Heres a pic!

02-04-2007 06:49:09

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Re: M freeze plugs in reply to John M, 02-04-2007 05:45:46

This is on the block I have.Went thru 3 head gaskets,two heads and hours of work before finding this.Its strange, this engine ran perfect.We would run it just above idle for hours at a time and no water would ever get in the oil.But go out the next morning and you could drain a gallon or more out of the top petcock on the pan.We used a IH repalcement block we had sitting around and used everything out of this engine, sleeves rings, pistons bearings and all.It runs just as good.

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