hi timp thread locker for onan exauast heli coils

[horseman with no horse 55]

is there a good loc tite that can take the heat from the exhaust that anyone knows of?

[WHX?? 53,079]

I would try the red it might be OK. I thought some one posted something about high heat... might have been for JB weld.

 

Try checking their website ... https://www.loctiteproducts.com/

[lynnmor 8,141]

If you are asking about the bolts in the block, tap the holes as deep as possible, then get longer bolts and use a drop of oil.

[Handy Don 14,869]

15 hours ago, WHX?? said:

I thought some one posted something about high heat... might have been for JB weld.

That was me and it was for the partially eroded threaded exhaust on a Kohler 181. Regular JB softened too much. The ceramic stuff is holding after 3 years. 

 

As for the Onan’s, I’d be very leery of thread locking into the aluminum block. I like @lynnmor’s “longer bolt” suggestion. 

[horseman with no horse 55]

im heli coiling it guys. i need SOMETHING to keep the coil in the threads is my point

Edited September 20 by horseman with no horse

[Handy Don 14,869]

17 minutes ago, horseman with no horse said:

im heli coiling it guys. i need SOMETHING to keep the coil in the threads is my point

I'll revise my answer to: I can see thread locker to secure the helicoil as long as you understand that the differing expansion indices of aluminum and steel might create stress on the interface between the coil and the block even after the manifold bolt is in place. I’d suspect that the coil might even loosen upon a later removal of the manifold bolt. 

In your situation, I’d strongly consider drill/tapping to a larger bolt before opting for a heli-coil. 

[Bill D 2,394]

A properly installed helicoil shouldn't come out easily.   Red loctite is probably your best bet.

[lynnmor 8,141]

I made numerous parts for NASA, they heli-coil everything made of aluminum.    Some of the manifold holes in a Onan can be made deeper eliminating the need for a heli-coil.