Well, see the photo below. There is a second broken stud on the underside of the cylinder too. How can this be fixed?
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| Broken Cylinder Stud: How to Fix It? http://t18.net/thorpforum/viewtopic.php?f=35&t=8159 |
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| Author: | Ryan Allen [ Sun Oct 15, 2017 3:31 pm ] |
| Post subject: | Broken Cylinder Stud: How to Fix It? |
Well, see the photo below. There is a second broken stud on the underside of the cylinder too. How can this be fixed? Attachment: Resized_20171015_123235(1).jpeg [ 855.7 KiB | Viewed 13090 times ] |
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| Author: | Jeff J [ Sun Oct 15, 2017 3:52 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
The stud should thread out once you can get a hold of it. Replacement studs can be a bit of a pain with the minimum torque requirement and getting the proper length remaining out of the case to put the nut on. I have seen the threads get pulled out but this the first broken cylinder stud. If it was a through stud the case would have to be split. |
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| Author: | Ryan Allen [ Sun Oct 15, 2017 3:57 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
Thanks Jeff. How would I get out the lower stud out which appears to have broken off flush with the case (rather than flush with the cylinder flange in the photo above). |
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| Author: | fytrplt [ Sun Oct 15, 2017 4:05 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
I'm thinking you are looking at a through bolt and not just a stud. Even if is just a stud, the amount of corrosion on the remaining studs would make me want to tear the engine down for a complete inspection. |
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| Author: | Jeff J [ Sun Oct 15, 2017 4:08 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
I hate to say it but I think the jug will have to come off for both. Probably have to drill the bottom one and use an easyout. How hard they come out will depend on what, if anything, was used as a thread locker. I think the through bolts are on the back side of number 2. |
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| Author: | Ryan Allen [ Sun Oct 15, 2017 4:09 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
The white stuff on the case and bolts is actually baby powder that I put on the case a couple hundred hours ago in search of an oil leak. |
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| Author: | 1albee [ Sun Oct 15, 2017 8:09 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
Looks like a no fun job. My concern is what caused them to fracture in the first place ? You may want to contact someone like Divco, there phone # is (918) 836 9101 they have been working with engine cases for 40+ years. They may be able to lead you in the correct direction before you get into something that could have been repaired before messing with it and causing a larger issue. Phil 118BC |
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| Author: | Rich Brazell [ Sun Oct 15, 2017 9:55 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
You probably did this , but I'll say it anyway . Soak the nut/stud with something like PB blaster or Kril oil .  RB 
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| Author: | Jeff J [ Mon Oct 16, 2017 10:26 am ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
I was just looking at the picture zoomed in. It looks to me like there might be some kind of sealant under the cylinder base. If true, that can cause all kinds of nastiness down the road to include broken cylinder studs and possible catastrophic failures. Those mounting flanges need to be clean. Mike Busch did a good article about it... https://www.savvyaviation.com/wp-conten ... -ya-in.pdf |
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| Author: | james peran [ Mon Oct 16, 2017 6:20 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
i would pull the cylinder off . Remove and replace all studs and nuts. Fit new studs with thread sealer to stop corrosion developing . There is enough stud sticking up to apply the stud removal tool. can buy at any good hardware shop .. J.P.. |
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| Author: | james peran [ Mon Oct 16, 2017 6:22 pm ] |
| Post subject: | Re: Broken Cylinder Stud: How to Fix It? |
i would pull the cylinder off . Remove and replace all studs and nuts. Fit new studs with thread sealer to stop corrosion developing . There is enough stud sticking up to apply the stud removal tool. can buy at any good hardware shop .. J.P.. |
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