A.C. D14 Block composition and broken manifold stud sock

Just started an overhaul of a D14 that came with some property i purchased. So far, no surprises, but one did surface last night. For those familiar with the 4-cylinder D14, it uses a combo intake/exhaust manifold. On mine, it is a complete rust heap and worthy of replacement. I figured the manifold studs would be a challenge, and over the years i've developed easy-to-more aggressive methods to get them out (or in this case leave them in if the threads looked good). After removing the muffler, i started to examine the manifold.Sometime in the past 60 years, looks like someone else tried to take out the studs. The stud on the far outside left threads in to a sorta "socket" that sticks off the block. If i had to guess, someone probably put way to much torque on the bolt, and it cracked off part of the female socket so that i could see about 1/3 of the treads of the bolt in the female socket. That stud was easy to remove, but now i'm trying to weigh repair options. Ponder: 1/what is the block material on a d-14. If it's cast iron, which i suspect, harder to weld a patch over the broken off female threads. 2/the male bolt
is grabbing about 2/3's of the thread channel , and it will take some torque. This is really an engineer equation, but for us garage guys, i think i'm going to use thread locker (red), reassemble, torque all to around 30 ft/lbs, and see what
happens. At this point i figure i have nothing to loose, and if this fails, depending on block composition, weld filler on the female socket , or if cast iron, take to someone who is good at that. Any other ideas? Toolman

https://www.yesterdaystractors.com/cgi-bin/store/enlarge_pic.cgi?wml_70234143.jpg:101481

You said ''(the manifold) is a complete rust heap and worthy of replacement.

The above should solve the problem!

already bought one from you.

(quoted from post at 08:48:01 04/06/23) already bought one from you.

Click to expand...

Just to be clear, the owners of this site seldom get involved in these discussions, it is the group of ''members'' here (of which I am one) that contribute most of the replies.

toolman welcome to YT! Yes, the material the stud is
threading into is cast iron. Yes, it is not the easiest
material to weld. It does not sound like you are able to
make the repair so I will not go into any details of that
process. It sounds to me like there is enough material
there to hold the stud in place. Some of the
terminology you used made your post a little difficult
to understand. I will add some clarifications here just
as helpful hints for future discussions. The part the
manifold bolts to is the engine cylinder head and not
the block. A protrusion off a casting to facilitate
mounting something such as the ..socket.. on the head
you are referring to is called a ..boss.. You called the
location the stud screws in a ..female socket with
threads, this is normally simply referred to as a
..threaded hole..

For future reference to help with properly naming the
parts of your tractor I am going to link the
manufacturers online parts catalog. I get the feeling
you are fairly computer savvy but just in case when
you go into the pages of the parts book clicking the
..Table of Contents.. at the upper left will take you back
to the main list of sections.

Lastly if did not know this these forums have topic
sections for the most all major tractors brands. I would
recommend that you make future posts about your
tractor in the Allis Chalmers section, see second link.
There is also a general discussion topic section simply
called ..Tractor Talk..
AGCO AC D14 online parts catalog

YT Allis Chalmers topic section

(quoted from post at 10:54:35 04/07/23) toolman welcome to YT! Yes, the material the stud is
threading into is cast iron. Yes, it is not the easiest
material to weld. It does not sound like you are able to
make the repair so I will not go into any details of that
process. It sounds to me like there is enough material
there to hold the stud in place. Some of the
terminology you used made your post a little difficult
to understand. I will add some clarifications here just
as helpful hints for future discussions. The part the
manifold bolts to is the engine cylinder head and not
the block. A protrusion off a casting to facilitate
mounting something such as the ..socket.. on the head
you are referring to is called a ..boss.. You called the
location the stud screws in a ..female socket with
threads, this is normally simply referred to as a
..threaded hole..

For future reference to help with properly naming the
parts of your tractor I am going to link the
manufacturers online parts catalog. I get the feeling
you are fairly computer savvy but just in case when
you go into the pages of the parts book clicking the
..Table of Contents.. at the upper left will take you back
to the main list of sections.

Lastly if did not know this these forums have topic
sections for the most all major tractors brands. I would
recommend that you make future posts about your
tractor in the Allis Chalmers section, see second link.
There is also a general discussion topic section simply
called ..Tractor Talk..
AGCO AC D14 online parts catalog

YT Allis Chalmers topic section

Click to expand...

Thanks for the information and terminology. I am an avid carpenter/electrician/smart home and low voltage guy. Got ahold of this cool d14 on a fluke. Kinda switched gears from wire to wrenches for fun. One bolt sorta lead to another,,,. SO yes, the boss in question is now easitly identified by the pic of the new intake/exhaust manifiold. (broken one on far outside left). I weld, but won't attempt a difficult cast iron repair that i think could make the entire picture much worse. I don't think my manual (and probably anyone elses) specs torque on the engine parts, but an intake/exhaust on a cast head will be pretty low, so i'm hoping that the partial threads will hold just fine. Now that i posted, i did have a chance to look around. i'll steer my next questions to the AC forum. Greatly appreciate your help. Regards,