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04-19-2023, 09:54 AM | #21 | |
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Join Date: Dec 2013
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Re: Stripped Columbia house
Quote:
Someone above mentioned Loctite Thread Repair. I had totally forgotten, but I used this to repair a stripped thermostat housing bolt hole in the intake manifold of my Corvette about 35 years ago. I followed the instructions closely and it must have worked, because when completed, the bolt took and held the specified torque when I re-installed the thermostat housing. I still have the car, and that repair has held through a valve job, a total engine rebuild, and at least two thermostat changes. It is the least I would try initially. The repair was quite similar, being a through hole in a casting using a 5/16" course bolt. The manifold was aluminum, but I would expect it to work even better in cast iron. If that didn't work, I would use a Heli-Coil. I would think that welding would be a last resort, given the difficulty of welding castings and would probably require removing the unit from the car. |
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04-19-2023, 04:42 PM | #22 |
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Re: Stripped Columbia house
It threads all the way in until it’s barely snug and then continues to spin
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04-20-2023, 08:55 AM | #23 |
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Re: Stripped Columbia house
Helicoil /insert then changing the bolts to studs has my vote
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04-21-2023, 06:54 AM | #24 |
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Re: Stripped Columbia house
put a bolt inside and thread it through the hole making it a “stud”
the metal is a little thin for a helicoil, it can get displaced easily. another fix i have done is to put a nut inside holding it in place with a bolt and tack weld the nut to the housing |
04-21-2023, 10:42 AM | #25 | |
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Re: Stripped Columbia house
Quote:
The only difference? I'd use an elevator bolt. They have a very low profile head and will not cause an interference issue in this area. You state the material is a "little thin" in this area. It is in fact way too thin for a Helicoil as well as too thin for tapping to a fine thread with any confidence of success.
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04-21-2023, 10:57 AM | #26 | |
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Re: Stripped Columbia house
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Quote:
If it were mine, I'd try the "Loctite Thread Restorer" first, as it is the one method that doesn't alter the original casting. From my experience, it does work and work well, and if it doesn't, you have lost nothing. |
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04-21-2023, 11:17 AM | #27 |
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Re: Stripped Columbia house
I've seen other types of housings that have fine thread fasteners originally but someone decided to cram a course thread fastener into. Or one that gets loosey goosey had someone tap it out to course threads. A lot depends on how much effort they went through to Fubar the housing. I've installed a lot of heli coils with good success. It might be worth a try to get the original size tap into it but I wouldn't expect it to be a good fit any longer.
I loctite the heli-coil with the grean stuff (609) or the HD thread locker (271) to insure it never comes loose. Cast iron can be difficult to work with so a person has to take a lot of care when negotiating any sort of repair to it. In many of the aluminum cases I've worked on over the years, a lot of the threaded bores were already heli-coiled. I've put heli-coils into thin stuff before but the coil may need to be ground off if it protrudes too far. This would likely require disassembly so all this has to be considered. The other option is to braze the hole shut and redrill & tap. This would be a lot more difficult for some but it could be done as long as the case was preheated and cooled slowly. Cast iron likes to crack. Last edited by rotorwrench; 04-21-2023 at 11:26 AM. |
04-21-2023, 02:43 PM | #28 |
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Re: Stripped Columbia house
That housing is steel not cast iron, from memory, only about 3/16 thick
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04-21-2023, 03:14 PM | #29 |
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Re: Stripped Columbia house
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04-21-2023, 05:27 PM | #30 |
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Re: Stripped Columbia house
I wasn't thinking about the Columbia half being a deep drawn steel part. A thickness of 3/16" won't have much thread in it. If three or four threads fit in then that might be enough for a coil. Since it's not cast, it could be welded up, drilled, & tapped. I've tried gluing bolts into holes using sealer. It's always a temporary fix but it might get by till the next overhaul.
Last edited by rotorwrench; 04-21-2023 at 05:33 PM. |
04-22-2023, 02:48 AM | #31 |
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Re: Stripped Columbia house
i was thinking it was cast and thicker if its steel definitely weld repair and retap then change to studs
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