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Old 07-17-2013, 11:57 PM
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Stripped threads and JB weld?

So I went to change out my bad thermostat today only to realize that the lower bolt that holds the housing was stripped out and a helicoil was used to repair the threads. So after a little further investigation I noticed that a large piece where the threads are on the block has been broken of and the person who did the hoky poky fix just used gobs of silicone to kind of hold stuff together and seal it up. So after showing a mechanic what I was working with he said that my options are to either get a new head, have and iron welder repair it, or use the top bolt only and use JB weld as a sealant and he said the JB weld will hold forever.

Now my question is, since I'm not in the position the buy a new head would JB weld actually work until I can buy a new head? I've never used JB weld but I've heard nothing but good things about it. Anyways thanks in advance for the help.
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Old 07-18-2013, 03:26 PM
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Any one?

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Old 07-18-2013, 03:31 PM   #3
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I have no idea without being able to closely examine the broken thread area. My initial thinking was to just drill & tap it to the next larger size but it sounds like a significant part of the threaded bolt hole has broken off, making that idea unfeasible. Not to mention the thermostat housing doesn't have much room around its bolt holes for a larger bolt size.
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Old 07-18-2013, 03:43 PM   #4
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I will start right off by saying this is a serious jury-rig but I have seen it work as a trail fix. If the lower threaded hole is actually broken open to sort of a 'c' shape, a j-bolt can be fitted to the lower hole in the housing with the threads pointing out. Put a washer and a nut on the j- bolt loosely. Hook the J bolt inside the head snuggly and the tighten the lower nut and install the upper bolt normally. It's not an ideal fix but it should hold for a while or at least until you can afford a new Head.

Even if the lower bolt hole isn't broken open, you can often hook the j-bolt's hook end through the hole so that the threads are protruding out and the thermostat housing can be installed.

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Old 07-18-2013, 04:23 PM   #5
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Mine was like that when I bought it (I didn't know until I changed the thermostat). I ended up replacing the head. I did run mine for quite a while before I saved up for the new head. I JB'd a stud in the lower hole, then ditched the thermostat gasket and used blue permatex in its place. I didn't do much more than hand tighten the nut on the bottom stud and let the whole thing sit a couple days before I filled it up with coolant. It was still working and sealed pretty good when I got around to changing it. I ended up ordering from Cylinder Heads International and got the head delivered to my door for 325 and that included return shipping on my old head. They don't care if it's busted or not, so long as all the parts are there. I called them up and ordered and had the head the next day. I do live close to them, so I got it faster than most people will. Still, they were good to deal with and I wouldn't hesitate to use them again.

Here's how mine was broken:

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