Farmall M Antifreeze in #3

Royse

Well-known Member
I'm trying to bring an M back from the dead for some friends.
It has sat in dry storage for so long they don't remember when
it last ran. It was not stuck and they don't know why it was parked.

While doing the normal preliminary checks I pulled the plugs
and rolled it over to get oil pressure and do a compression test.
#3 cylinder blows antifreeze out. Every time and seems to refill
in between turns of rolling it over.

My question is what is the likely cause on this particular engine?
Were they prone to cracked heads/blocks or is it more likely
just a blown head gasket? Something else entirely?
 
Blown head gasket or cracked head but as far as I have heard the M was not known for cracked heads. Now if it was an MD they where known for cracked heads.
 
you dont know why it was parked? as that could be the reason... the sleeve and block may have cracked due to freezing. then was just drained and forgot about. i have seen the block and sleeves split wide open. and if its running in that fast it a big problem.
its tear down time for your answer,or forget about it. these engines were pretty reliable. didnt have much trouble with cracks, unless abused.
 
Thanks guys, not knowing much history is tough.
It was their dad's tractor and he recently passed.
They wanted to get it running again.
It doesn't cost anything to take the head off and
look but I wanted to give them an idea of what
it might entail to fix.
One other detail, I don't see AF in the oil.
 
did u just add the antifreeze to engine? sounds like thats what ur saying.because if it sat with antifreeze and its in the cyl. it will be in the oil pan also. how much is blowing out? but if thats the case... just pull the head.
 
I did not add antifreeze.
I had soaked the cylinders with ATF so I expected ATF to
come out but this one spewed quite a bit of antifreeze instead.
When I first rolled it over there was quite a bit coming out.
Liquid - enough to splash on the floor. 1/4~1/2 cup maybe?
Wait a few minutes, roll it over again until water coming out
was a mist and had almost quit. 10~15 seconds or so. (12V)
Wait a few minutes and repeat.
The first few times it was liquid at the start.
Now what is coming out is more of a fog/mist but clearly visible.
Doesn't seem to be stopping though.
 
Now that I've got it mostly dry, 120 like the rest.
This engine was rebuilt by a local guy who is very good.
Problem is, no one remembers when that was done either.
 
wont hurt to start it and run it up to temp. then check it after. nothing to loose. just keep an eye to see if any goes in the pan. it might be seeping through the head gasket.
 
I did exactly that rustred, running on my temporary gas tank
and a carb I just rebuilt for it, the tractor fired right up and
sounded really nice other than the governor is not responding
as it should. Throttle changes a little but not the full movement.

It pushed black goo out of the exhaust manifold for a while.
Looked like diesel slobber to me.
It cleared after 30 seconds or so but made a nice mess.
At least I know it will run, now the owners can make decisions.
Thank you all for helping me save another one.

Here it is when it was being brought to my place Friday.

39546.jpg
 
After I get home from work tomorrow I'll probably run it again.
Then pull the plugs just to look and see what they look like.
I haven't tried to move it or test anything yet, just fired it up.
As you can see, it won't be an overnight project.
Thanks for the advice, I truly appreciate it.
 
Thought I'd post an update.
I lightly sandblasted the plugs to clean them before starting it.
I have run in maybe 20 minutes total in short runs due to using
a temporary gas tank until the original tank gets cleaned.

These are the #3 (antifreeze cylinder) and #4 plugs.
Unless you see something I don't, I'm going to leave it be.

Bonus picture of the sediment bowl.

39747.jpg


39748.jpg
 
I would put a head gasket on it. If the rebuilder didn't re-torque the head after rebuild(torque, run till hot, then retorque), the gasket could easily be blown.
My friends 51 H just did the same thing. Anti freeze in 1 of the cylinders, and all.
Replacement of the head gasket, then retorquing after running fixed that problem.
 

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