Exhaust loctite?

[Barry Tilson]

What type of thread locker do we use on the two bolts that hold the exhaust pipe on the motor? The threads do not have any locking mechanisms to them. I.e Hatori pipe.

[Jason Cummings]

I always had better luck using the orange permatex gasket seal on the threads than loctite. Hope this helps.

[Mark Dean]

+1
Definitely use high temp permatex. I have found nothing else that works as well on this type of application.

Mark

[Mike Spano]

i have tried many many different colors and chemistry of rtv for this application on both gas and nitro helis. i settled on the one below. it can stand the extra heat of the gas motor over the nitro, and the additional oil from the nitro over the gas. it is a good overall material. i will put a tiny layer as a gasket, then stick my bolts into the top of the container of rtv to fill the threads up. then wipe the excess off then install and wipe excess off again. let it cure up for a good day or so before trying to run it.

locktight just cant handle the temps on the pipes.


http://www.zoro.com/i/G1954687/?utm_source=google_shopping&utm_medium=cpc&utm_campaign=Google_Shopping_Feed&gclid=CjwKEAiAt4mlBRDXwt_m9ICU4DcSJAAS_X0WpdiGDG50_Qh3fowuFyVNL8WAmyWFIoB-_XqJboMotBoCKXvw_wcB


hope this helps.

[Barry Tilson]

Great thanks!


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[Jean-Luc Bolduc]

In a pinch, use a small thin dab of 5 minute epoxy on the 4mm threads. Holds up good and it will break lose if need to undo.

[Barry Tilson]

Thanks for the feed back.


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[Darren Lee]

In my experience, neither threadlock nor gasket is needed for a muffler installation.  As long as the mating surfaces are flat and clean, tighten the bolts using split washers and it will stay put just fine.

[Helinut]

I'll second everything mentioned above.   I do add nuts to the bolts protruding out of the exhaust flange for added security.  Concur with what Darren mentioned, but tighten and retighten a few times immediately following a flight.

[Barry Tilson]

In my experience, neither threadlock nor gasket is needed for a muffler installation.  As long as the mating surfaces are flat and clean, tighten the bolts using split washers and it will stay put just fine.

Like this idea however the bolts are not long enough. May have to source longer bolts.
I could drill the heads and safety wire them! LOL

[Barry Tilson]

Picked up some 4x40mm bolts from Tower(came with 37mm). Looks to be an OS part number, added some split washers. Do you have to secure the four smaller allen bolts that fit into the silicone isolators with anything?


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[Mike Spano]

i use a bit of blue lock-tight on them. it probably doesn't really help much due to the heat, but i am not happy with a bolt if it doesn't have some lock-tight on it unless it is a bolt in the motor itself. do be sure to clean the bolts, the female portion, and the silicone all off good to keep the oil out of the lock-tight. i use denatured alcohol.

[Barry Tilson]

Thanks!

[Kevin Feil]

Barry,

 There are countless methods obviously and so many highly experienced builders/ Pilots on the forum will surely have there full proof tricks that work great, to add to the many great ideas, I have personally drilled the threads out of my engine blocks and ran longer bolts (using the thin layer of orange high temp permatex gaskets) with a lock washer and nut,"provided the pipe is threaded" I tighten it up and put a couple of Heat Cycles on the motor/pipe and re-torque. And I haven't had one back out yet.. Good luck dude!!

K

[Dan Minick]

Great minds think alike Kevin, I have been nutting my pipes for years