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?/Concern-Heli-coil threads
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Manifold studs

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Ken Reese

04-02-2000 18:57:04




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Recently, I had an automotive/tractor machine shop do work on the head of my 1950 JD model B including removing the old manifold studs.

Today, I noticed that Heli-Coil theads were installed in three of the four stud holes. The three holes where the Heli-Coils were placed are open to the water jacket below.

Will the thread inserts leak when the studs are in place? If so, what suggestions do you have to prevent leakage and possible damage to the valves and cylinders, etc.?

Any advice will be appreciated.

Ken Reese
E-mail: [email protected]

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LTM

04-04-2000 00:05:34




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 Re: ?/Concern-Heli-coil threads - Manifold studs in reply to Ken Reese, 04-02-2000 18:57:04  
General Motors has a teflon thread sealant that they use for the head bolts that go into the water jacket. I have used it on my bigblock and haven't had any problems.



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twopop

04-03-2000 15:41:59




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 Re: ?/Concern-Heli-coil threads - Manifold studs in reply to Ken Reese, 04-02-2000 18:57:04  
I think you should either use rtv silicone or anti-seize on the studs and not use locktight in case you need to remove the studs later on.some water is going to get to the studs and rust them up,i would think you would want to use a compound that would release the stud.i dont think they will leak when you put the manifold gaskets in place,but when you install them use more rtv around the studs



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Rob

04-03-2000 17:25:00




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 Re: Re: ?/Concern-Heli-coil threads - Manifold studs in reply to twopop, 04-03-2000 15:41:59  
If you ever have to remove the studs, locktite isn't impossible to free up. In fact, a little "excessive" heat will cause locktite to release quite easily. I would be paranoid about silicone or plain anti-seize as most of these old tractors sit more than work and the possibility of water getting into the cylinders during storage brings thoughts of re-doing an overhaul to mind. Even a little water seepage (until the passages rust up) can do quite a bit of damage to shiny cylinder walls.

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Rob

04-03-2000 05:58:16




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 Re: ?/Concern-Heli-coil threads - Manifold studs in reply to Ken Reese, 04-02-2000 18:57:04  
Locktite make a few different grades of thread locker/sealer. Read the pakage and find one made for your aplication, it should be a thread sealer type. I have helicoils on my 50 manifold bolts as the old hole rotted out and it's working fine.



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DougS

04-03-2000 04:45:56




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 Re: ?/Concern-Heli-coil threads - Manifold studs in reply to Ken Reese, 04-02-2000 18:57:04  
Heli-coil makes a stronger bolt attachment than the original threads for several reasons that I cannot type right now. I have a G with helicoil inserts in the head studs, manifold, upper water pipe, and have no leakage problems due to the fact that I take RTV Silicone Sealant and use it as thread compound. Do not worry about these inserts, they are OK.



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