[Farmall] Leaking cylinder head

[Ed and Mary Gilliland]

I am hoping that I may have the leak fixed.  I removed the stud nut and 
washer where it was leaking, and gave it a good coating of high temp. RTV 
silicone gasket sealer.  I retorqued the nut, and let it set for 2 days.  I 
filled the radiator with coolant 2 hours ago, and so far so good.  The leak 
was at the threads on top of the stud, so the washer was doing its job 
against the head.

This head, and 2 others that I have seen, does indeed have  5/8 " O.D. 
sleeves that are pressed into the three holes near the center of the head. 
The sleeves are 4 1/4 " long, which means that they go from top of head to 
bottom, all the way thru the head. The I.D. of the sleeves is big enough to 
allow the stud to pass thru.  Head Casting #8043 DC on a 1950 H.  The only 
reason that I can see for them is that they are used to seal off the water 
jacket inside the head.  Probably had to do with the manufacture of the 
casting.

I only have 4 studs that extend down into the water jacket of the block. 
They are located on the manifold side of the head and block. I don't have a 
problem there with any leaks, after I coated them with the same sealer.

Thanks for your reply .  These old tractors are a real challenge for a 
country boy like me.  But, I have enjoyed it.

Ed

----- Original Message ----- 
From: "Mike Sloane" <mikesloane at verizon.net>
To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
Sent: Wednesday, December 21, 2005 7:00 AM
Subject: Re: [Farmall] Leaking cylinder head


>I have never had a problem like that, maybe because I have never seen an H 
>head that has "sleeves" in the head for the studs. Second, if the nuts 
>(with washers under them) are torqued down properly, it would be very 
>unlikely that anything would get past them. And third, there is no place 
>where coolant comes anywhere near the holes for the studs (in the head), 
>unless someone put the studs back into the block the wrong place (some were 
>longer than others, and they are protruding into the water jacket, and the 
>coolant is coming up from the block. If that is the case, then you need to 
>remove all the studs and put them in the right places. Or you could try 
>removing the ones where the leak occurs and putting plumber's pipe thread 
>sealer on the threads on the block ends.
>
> Mike
>
> Ed and Mary Gilliland wrote:
>> OK, I am sure some of you guys have run across this problem before.
>> I have a Farmall H that I have completely rebuilt, and am having a
>> problem with a coolant leak in the head.  The leak occurs at one  of
>> the three studs that have  sleeves in the head.  These are in the
>> middle of the head.  When I fill the radiator, a small amount of
>> coolant will seep out around the outside of the stud sleeve, which
>> means that the press fit of the sleeve is not sealing against the
>> stud hole in the casting.  I have tried using a bronze washer under
>> the stud nut.  The coolant does not seep around the washer, but up on
>> top of the nut at the threads.  Can you give me some suggestions on
>> what I might be able to do?  I want to stop this leak before I
>> attempt a start.
>>
>> Thanks.  I enjoy reading the many comments even though I don't often
>> write myself.
>>
>> Ed Gilliland
>>
>
> -- 
> Mike Sloane
> Allamuchy NJ
> mikesloane at verizon.net
> Website: <www.geocities.com/mikesloane>
> Images: <www.fotki.com/mikesloane>
>
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