Did you strip the threads on the bolt or the threads in the manifold?
You can oversize the manifold stud hole and switch to a stepped stud. Or you can heli-coil a new set of threads in the manifold. Before you opt to use a stepped stud make sure a stepped stud in the size you need is available.
Original stud was:
3/8-16 NC-2 x 3/8-24NF-2 1 9/16" long.
Superceded to:
3/8-16NC (NC threads 9/16" long) x 3/8-24NF-2 (NF threads 5/8" long) x overall 1 9/16" long.
The 3/8-16NC are the thread size in the exhaust manifold.
To heli-coil repair you need a 3/16NC helicoil kit.
To oversize the hole in the manifold you can drill it out to a 7/16-20NC thread and buy a stud with the same dimensions as the second one above and change the 3/8-16NC to 7/16-20NC.
This would be a :
7/16-20NC (NC threads 9/16" long) x 3/8-24NF-2 (NF threads 5/8" long) x overall 1 9/16" long.
This may be an odd size which is why I said make sure you can find this stepped stud before you commit to going oversized in the manifold hole. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
You may also consider just removing the manifold and take it to the machine shop for about one hour's labor and be done with it. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Joined: Mar 13, 2006 Posts: 1079 Location: Richburg, SC
Posted: Thu Aug 03, 2017 8:49 pm Post subject:
wesk wrote:
Did you strip the threads on the bolt or the threads in the manifold?
You can oversize the manifold stud hole and switch to a stepped stud. Or you can heli-coil a new set of threads in the manifold. Before you opt to use a stepped stud make sure a stepped stud in the size you need is available.
Original stud was:
3/8-16 NC-2 x 3/8-24NF-2 1 9/16" long.
Superceded to:
3/8-16NC (NC threads 9/16" long) x 3/8-24NF-2 (NF threads 5/8" long) x overall 1 9/16" long.
The 3/8-16NC are the thread size in the exhaust manifold.
To heli-coil repair you need a 3/16NC helicoil kit.
To oversize the hole in the manifold you can drill it out to a 7/16-20NC thread and buy a stud with the same dimensions as the second one above and change the 3/8-16NC to 7/16-20NC.
This would be a :
7/16-20NC (NC threads 9/16" long) x 3/8-24NF-2 (NF threads 5/8" long) x overall 1 9/16" long.
This may be an odd size which is why I said make sure you can find this stepped stud before you commit to going oversized in the manifold hole.
OK, bringing up this old thread because it was as close as I could find to what I was searching for. I am looking for the stud sizes for my M38a1.
Can someone look at the parts manual and get the exhaust stud sizes for me? The ones stated above should be the size for the center studs, but the front and rear ones are longer - like maybe 2 1/16" long?
I removed all the studs from my block (F-head) except for the broken one in the very back. I am planning on moving the body back far enough to get to the broken one tomorrow. Anyhow, I am at work right now so I can't download the parts manual to get the sizes for the studs and wanted to stop on the way home in the morning to save a trip to town. _________________ Matt
1953 M38a1
1964 USMC M38a1
'51 USMC M100 trailer, '54 M100 trailer, '90 M101a1 trailer
Http://wilfreeman.wordpress.com (M38a1 build blog)
http://m38a1usmc.wordpress.com (USMC M38a1 rebuild blog)
Joined: Mar 13, 2006 Posts: 1079 Location: Richburg, SC
Posted: Fri Aug 04, 2017 2:42 am Post subject:
Thanks Wes! Now I can stop by on the way home and not have to make a special trip to town to pick them up. _________________ Matt
1953 M38a1
1964 USMC M38a1
'51 USMC M100 trailer, '54 M100 trailer, '90 M101a1 trailer
Http://wilfreeman.wordpress.com (M38a1 build blog)
http://m38a1usmc.wordpress.com (USMC M38a1 rebuild blog)
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