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Old 01-18-2019, 05:01 PM   #1
mill48
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Default Hole in water jacket

Hey guys, I have an issue here. I had a broken stud that tightens the manifold.
I drilled the nut out, but I drilled a little too far into the water jacket. Needless to say it leaks water or coolant. Has anyone had this problem? if so, how did you solve the issue? This is on a 1928 Model A.

Thanks in advance,
Melvin Miller
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Old 01-18-2019, 05:58 PM   #2
Synchro909
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Default Re: Hole in water jacket

Hmm, I bet you regret doing that!!
I'm sure others will come up with ideas too but the first thing I would try is as simple as putting a dab of RTV silcone on the thread. Clean it up first. RTV silcone should seal the thread, withstand the heat and yet you will still be able to undo it later. The heat should not be too bad anyway seeing as how it is so close to the coolant.
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Old 01-18-2019, 06:47 PM   #3
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Default Re: Hole in water jacket

Hard setting Permatex or jb weld.
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Old 01-18-2019, 08:10 PM   #4
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Default Re: Hole in water jacket

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Hard setting Permatex or jb weld.
That would probably work but I went away from something as hard and perminent as that because the stud may have to be removed at some time in the future, like an engine rebuild.
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Old 01-18-2019, 11:59 PM   #5
Mike V. Florida
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Default Re: Hole in water jacket

I'd go with Synchro909's suggestion.
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Old 01-19-2019, 02:57 AM   #6
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Default Re: Hole in water jacket

Thanks guys, I really appreciate it. I will try the RTV Silicone first and let you know how it turns out. I already tried jb weld without success.
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Old 01-19-2019, 04:05 AM   #7
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Default Re: Hole in water jacket

Wrap a bunch of Teflon tape for plumbing fittings. Use enough that it’s a little bit of a tight fit as the tape is meant for tapered threads. It will seal it and be able to come out easy later.
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Old 01-19-2019, 09:19 AM   #8
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Default Re: Hole in water jacket

Try some of " the right stuff" by permatex on the threads.
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Old 01-19-2019, 09:50 AM   #9
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Default Re: Hole in water jacket

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Originally Posted by Synchro909 View Post
That would probably work but I went away from something as hard and perminent as that because the stud may have to be removed at some time in the future, like an engine rebuild.
why would you rebuild that block, it has a bad stud in the water jacket
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Old 01-19-2019, 02:38 PM   #10
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why would you rebuild that block, it has a bad stud in the water jacket
I see no reason not to rebuild that block if something as simple as a dab of RTV is enough to keep it going. Things are different over there but good blocks don't grow on trees here. I nearly cried when I was at Berts last year and saw some of the blocks they were rejecting. Sure, some were scrap but it wouldn't have taken much to bring some back into good service. It seemed to me that lots of good stuff is wasted over there but like I said, things are different.
The majority of the engines in my cars have at least one Helicoil and one has 5 of the head studs held by one (each). 30,000 miles and no sign of trouble and even if it did fail, it would still not be the end of the world.
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