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Subject: 8n seat spring mounting studs

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Doug    Posted 08-06-2019 at 17:38:39 [URL] [DELETE]        [Reply] [Email]  
  • 8n seat spring mounting studs
  • I have a 1950 8N that has only one of the two studs that the seat springs is held to the top of the hydraulic case still in tact. The second stud has broken off below the level of the hydraulic case. Has anyone attempted to remove/extract a threaded stud that I am referring to? I'm not sure if the stud passage is a thru passage into the hydraulic case or exactly how the stud is seated into the case. Before I go and tear up something unnecessarily, has anyone had experience extracting one of these studs and replacing? Thanks

    Tim Daley(MI)    Posted 08-07-2019 at 09:42:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n seat spring mounting studs
  • Option #1: Use an Easy-Out with a few days spent spraying some PB BLASTER into the holes first. Spray a few times a day for 3 days before trying. Option #2: Remove the top cover and access it thru the bottoms of holes. Spray some PB first too so if there is enough stud length to grab it will be easier to remove. Just trying to drill it out with a hand drill isn't going to work -it will walk and ruin the sidewalls or just break. A hand drill probably doesn't have enough HP to drive the stud out. A good machine shop will have a magnetic drill press to lock the unit in and you can use a carbide drill to better break the hard stud material. Removing the top cover is the right way but the most time consuming and labor intensive. If you need a hydraulic repair might want to tackle that at the same time.


    Tim Daley(MI)

    Dn-N-Tn    Posted 08-06-2019 at 18:51:18 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n seat spring mounting studs
  • I'm pretty sure the thread go completely through the case. You might try this---take a small piece of flat steel, say 3/16" thick, 1" wide, and 2" long, drill a 3/8 or 7/16" hole right in the middle---lay the hole you just drilled directly over the broken stud, and electric weld the broken stud to the metal with a 6013 rod. This rod won't stick well to the cast iron, but will to the stud. The heat of welding will also aid in loosening the stud, and you should be able to screw it out----good luck, Denniss

    Doug    Posted 08-06-2019 at 19:17:54 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n seat spring mounting studs
  • Thanks for the idea. Unfortunately, the stud is broken off approximately 1/8 of an inch below the top. I am/was hoping that the threaded stud doesn't have a head that resides under the top of the case. I will look at using a screw extractor if there is no bolt head or some type of mechanical "fastener/head" holding the bolt in the case.

    Doug    Posted 08-06-2019 at 19:17:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n seat spring mounting studs
  • Thanks for the idea. Unfortunately, the stud is broken off approximately 1/8 of an inch below the top. I am/was hoping that the threaded stud doesn't have a head that resides under the top of the case. I will look at using a screw extractor if there is no bolt head or some type of mechanical "fastener/head" holding the bolt in the case.

    Dn-N-Tn    Posted 08-06-2019 at 20:15:19 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n seat spring mounting studs
  • If the threads aren't rusted and stuck too bad, you might get it out with an extractor. If not, you can still weld it 1/8" below the surface by striking the arc on the broken stud first, build it up a little, then weld the hole up with a deep penetration.

    Doug    Posted 08-06-2019 at 20:19:25 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n seat spring mounting studs
  • Thanks for the suggestions!

    TheOldHokie    Posted 08-07-2019 at 08:28:10 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n seat spring mounting studs
  • I hope you are a skilled welder if you go this route. My guess is the reason it is broken off is it is so rusted in place it is not going to come out except in pieces. I expect it will require drilling it out all the way to the threads. And if you don't get that exactly right a thread repair insert is probably in your future.

    TOH

    Doug    Posted 08-07-2019 at 09:23:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n seat spring mounting studs
  • I have a friend that is a machinist and I'll give him a call. Was hoping to do this myself, but it's probably a great opportunity to have a pro guide me in person.

    JMOR    Posted 08-07-2019 at 09:58:47 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n seat spring mounting studs
  • Holes in top cover casting for studs in question go all the way through . No bolt head, etc.

    Doug    Posted 08-07-2019 at 10:03:36 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n seat spring mounting studs
  • thanks for that info. any idea of the thickness of that case where the studs are mounted?

    JMOR    Posted 08-07-2019 at 11:14:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n seat spring mounting studs
  • Never measured. If I had to estimate, based on dim memory, pictures, reason-ability, etc., I would go for 3/4 inch. Where studs are located, there are "humps" for lack of better word, that give extra thickness to casting, beyond surrounding areas.

    Doug    Posted 08-07-2019 at 13:32:51 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n seat spring mounting studs
  • Thanks so much for the info and the picture. I am hoping to avoid lifting off the cover with this project. Will let you know how this project proceeds.

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