Synergy Tech Support
Synergy Nitro Helicopters => Synergy N7 => Topic started by: Barry Tilson on December 29, 2014, 07:25:47 PM
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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.
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I always had better luck using the orange permatex gasket seal on the threads than loctite. Hope this helps.
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+1
Definitely use high temp permatex. I have found nothing else that works as well on this type of application.
Mark
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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 (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.
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Great thanks!
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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.
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Thanks for the feed back.
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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.
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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.
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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
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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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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.
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Thanks!
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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
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Great minds think alike Kevin, I have been nutting my pipes for years :)
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i may have missinterpreted the post, i apologize. i thought we were talking about the 4 M3 bolts that hold the pipe to the mounting plate, not a pipe that bolts to the motor with long M3's. yes, i nut those as well.
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i may have missinterpreted the post, i apologize. i thought we were talking about the 4 M3 bolts that hold the pipe to the mounting plate, not a pipe that bolts to the motor with long M3's. yes, i nut those as well.
Yes, both sets of hardware are being discussed. Your correct Mike. Lock washers on the 4 smaller M3 bolts is hard to find. It seems like the silicone isolators may provide some locking characteristics with the combination of Loctite or high temp silicone on the threads.
I have done what Kevin and the others have suggested with the lock washers. This fits well with how I would like to see the two header bolts hold the manifold on.
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If I'm not mistaken, the 4 blind nuts on the header are a type of "crush" nut...not needing loctite of any type. I've had one of those nuts lock on very well, to the point I could not remove it from the header! ???
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They are a different type of nut than I'm used to seeing. I will keep an eye on them to see how they hold out.
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They are self-clinching nuts. They're usually used in sheet metal. I use them all the time in sheet metal panels on equipment.
http://catalog.pemnet.com/category/pem-brand-self-clinching-and-broaching-fasteners (http://catalog.pemnet.com/category/pem-brand-self-clinching-and-broaching-fasteners)