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05-25-2015 05:26 PM  3 years agoPost 1
mustang67ford

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Central Pennsylvania

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I pulled the RJX muffler today to reseal. Got it all cleaned up. There was some sort of gasket betwwen the engine block and the first mounting plate. Does not look like it worked very well. DO I need it or can I just use silicone? Any silicone/rtv recommendations and should I put a bead and let it dry then bolt or bolt right away? Do I need to worry about it a dried piece getting in the motor (squeezed out)and stalling it as I have had this happen on a nitro. Assuming blue locktite on the bolts even though it gets hot. Any info would be good, don't want to pull muffler again anytime soon.

Team HeliProz - Retired
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05-25-2015 11:26 PM  3 years agoPost 2
mustang67ford

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Central Pennsylvania

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Ended up using the black ultra rtv with no gasket. Good for 500 deg intermittant

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05-26-2015 03:23 AM  3 years agoPost 3
turboomni

rrProfessor

East of the Equator

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That stuff works ok but can get goopy if you use too much. My last RJX muffler instal I used automotive exhaust manifold rtv with is good for much higher temps. Just smear a very very thin layer and bolt it down. Afteer the engine is run and hot screw it down again.

Setup is everything, All my heli's can fly far better than I can pilot them

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05-26-2015 03:37 AM  3 years agoPost 4
rbort

rrProfessor

Franklin, MA - USA

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I tried the black rtv in the past
It gets hot and melts into black slime, unlike the red stuff which turns into rubber. Made a mess for me so I gave the tube away didn't want to use it again.

Generally speaking I prefer to put some gasket between the motor and the muffler. While putting it bare might work, my issue is that if it gets loose aluminum will bang aluminum and you will wear the metal out at the mating surfaces. Then you gotta do the sparky thing and pull out your file and start stroking it.

-=>Raja.

MA 1005 Hanson 280, 4220 flts
Spectra 27 3DMax, 3310 flts
Whiplash V1-2 Hanson 300, 1618 flts
Whiplash V2 Hanson 300, 473 flts

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05-26-2015 05:33 AM  3 years agoPost 5
turboomni

rrProfessor

East of the Equator

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Then you gotta do the sparky thing and pull out your file and start stroking it.
In public?? Doesn't he get arrested??

Setup is everything, All my heli's can fly far better than I can pilot them

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05-26-2015 12:56 PM  3 years agoPost 6
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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I used up a tube of Ultra Black plus the tube Raja gave me

It worked very well for me, I suspect your leak will stop.

No gasket is the key, I have never needed to re-tighten. They should not come loose once the gasket is removed unless you have a major vibration issue.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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05-28-2015 03:51 AM  3 years agoPost 7
turboomni

rrProfessor

East of the Equator

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Well I guess a gasket or no gasket will work. I don't and have had success but there are many ways to skin a cat as they say!!!

I will say I use the RJX muffler and the mating surfaces were NOT true. This has been the case of two of them. The quality control of the mating surfaces is not very good. Do not know of other brands because I really like the sound and lack of sound of these mufflers,,,never mind the price!!

Setup is everything, All my heli's can fly far better than I can pilot them

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05-28-2015 03:48 PM  3 years agoPost 8
geomecc

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Long Island ,NY

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I use the copper rtv and also put some on the threads of the bolts. it helps absorb some of the vibes and is slightly flexible so it helps to hold the bolt.

R I P Roman Jr. Team SKOOKUM SRW EFC

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10-15-2015 03:48 AM  3 years agoPost 9
D-fly

rrApprentice

cincinnati, oh

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I take red high temp rtv and smear it on both sides of the rjx gasket.
Del

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10-15-2015 04:03 AM  3 years agoPost 10
turboomni

rrProfessor

East of the Equator

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Both my RJX's didn't have a gasket. I guess you mean header or spacer? I use exhaust manifold rtv ,,the red as you said. The black sorta worked ok but I believe it was abit out of it's temp range as it got goopy and ran slightly.

Setup is everything, All my heli's can fly far better than I can pilot them

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10-20-2015 01:26 PM  3 years agoPost 11
Luis104

rrApprentice

Caracas / Venezuela

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I´ve never used gaskets; instead, I use Devcon 5 minute epoxy, it perfectly seal the muffler to the engine for years without leaks(if you don´t crash). It is very easy to remove after a one or two flights, because the heat burns it changing in color, it becomes harder (like a cookie) and it also loses some adhesion to the engine and muffler metal

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