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<DIV>Some time in the mid/late ‘50s, IH started using nodular iron in places on
tractors where you would have otherwise seen cast iron. It obviously
wouldn’t have applied to any letter series Farmall. But I wonder if that
is what those machine shops were running into with the truck heads. Don’t
know.</DIV>
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<DIV>Jim Becker</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=hrpletch@gmail.com>Howard
Pletcher</A> </DIV>
<DIV><B>Sent:</B> Friday, December 04, 2020 9:33 PM</DIV>
<DIV><B>To:</B> <A title=at@lists.antique-tractor.com>Antique Tractor Email
Discussion Group</A> </DIV>
<DIV><B>Subject:</B> Re: [AT] [External] Re: Valve Seat
Inserts</DIV></DIV></DIV>
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<DIV class=gmail_default style="FONT-FAMILY: tahoma,sans-serif">IH truck gas
engines also had quite hard heads without inserts, hard enough that reportedly
some shops thought there were already inserts in them when they tried to work on
them. Few problems seem to have developed in the years since lead was
dropped. I believe it is the material used in the castings, not heat
treating. But these engines were designed for extended use at wide open
throttle in trucks like the Loadstar so they are not stressed in smaller trucks
like pickups and Scouts.</DIV>
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<DIV class=gmail_default style="FONT-FAMILY: tahoma,sans-serif">Different
Divisions of IH, different foundries, different engineers. But perhaps
they did talk to each other.</DIV>
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<DIV class=gmail_default
style="FONT-FAMILY: tahoma,sans-serif">Howard</DIV></DIV>
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<DIV class=gmail_attr dir=ltr>On Fri, Dec 4, 2020 at 1:59 PM Jim Becker
<<A>mr.jebecker@gmail.com</A>> wrote:<BR></DIV>
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<DIV>The only reference I found that directly addresses this is the I&T
Shop Manual. I presume it is accurate although it is not first-hand IH
material. According to it, the M, 6, and 9 series non-Diesels used
inserts for the exhaust valve seats. The H did not but the Super H and
Super 4 series did. The Diesel M, 6, and 9 series did not use
inserts.</DIV>
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<DIV>The higher compression of a Diesel translates into a higher temperature
in the chamber prior to ignition. I don’t know if that translates to
higher temperature after ignition and completion of the power stroke. I
suspect not. Diesel fuel itself isn’t that great of a lubricant but is a
better one than gasoline. That may make enough difference for IH to have
decided to not use hardened inserts in Diesels. Nothing in the above
eliminates the possibility of hardening the seats that were ground into the
Diesel heads. IH was big on induction hardening and applied it to a lot
of things. I am not aware of them heat treating cast iron parts.</DIV>
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<DIV>Jim Becker</DIV>
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