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Short Circuit · 10-14-2007, 03:04 PM

The exhaust gasket is kaput in my GMS 47
Can I use RTV 108 silicon in place of the paper gasket ?

Mark

voyager_663rd · 10-14-2007, 03:39 PM

personally i use permatex red (can tire). Good to 343oC. Yours is good to 200oC.

Try it and see what happens. Worst thing is it won't work and leak like crazy

michel gravelle · 10-14-2007, 06:27 PM

Hi Mark

Heres how to make another gasket

Take a playing card , and an ink pad or ink from a pen . smeer it on the exhaust port of the engine . place it on the card right away , and you have an imprint of the gasket that you need . Cut out the gasket with an axacto knife #11 , for the holes use a sharpened piece of brass tubing at the end . This will last longer than any chemical that you use , the exhaust can hit up to 600 degrees F , and also can get caught in youre tank through the pressure fitting , it happened to me .

Hope that this helps

Mike

AJCoholic · 10-14-2007, 06:47 PM

FOr most of my engines, I prefer to use an aluminum or brass gasket cut from thin (2 to 5 thousandths) sheet stock. They do not compress over time and your muffler stays put. ALso, the metal gaskets do not get ruined like paper gaskets when you take the muffler off.

RTV silicone can indeed be used on our mufflers as well. However I find most guys use WAY too much. The face of the exhaust and muffler are pretty flat and you are just trying to seal the very small inperfections that do not allow a gas tight seal. Only a very, very small amount of sealant is needed, spread evenly on the face of one of the two surfaces. WHen you attach thge muffler you should just see the slightest amount of squeeze out. I have taken engines apart that almost had the exhaust blocked by the large glob of silicone! Too much is no good. Just a little bit!

AJC

**scaleguy** · 10-14-2007, 06:49 PM

Use Permatex "GOLD" it is better then the Red.

Like Andrew said use it sparingly with a light coat on one surface or it may ooze into the exhaust port and restrict gasses.

Vulcan1 · 10-14-2007, 08:02 PM

A trick I learned was to take a coffee filter and put some high temp silicone on it. Spread it arond so it goes through the other side then sandwich it between wax paper and apply weight or in my case two pieces of ply with a couple of clamps. Let sit overnight and then make your gasket. Keep the rest of the sheet for making more gaskets.
Try it.
John

10-15-2007, 07:46 AM

With most engines where there is aluminum to aluminum contact of the muffler and case the two surfaces will vibrate against each other. This will cause pitting of the surfaces.

Forget paper and chemicals. Do as Andrew says and use Brass or Aluminum gaskets. I prefer brass.

Ed S

Guest · 10-15-2007, 08:48 AM

Thin copper works better and can be easily annealed each time it is removed so it re-seals again.

Dennis

Short Circuit · 10-15-2007, 01:45 PM

Wow thanks for so many great replies !!!
Now which one to try first.................

Mark

Guest · 10-15-2007, 10:01 PM

Quote:

Originally Posted by Short Circuit

Wow thanks for so many great replies !!!
Now which one to try first.................

Mark

In our model engines the most common material they use for head gaskets which is the ultimate aluminum to aluminum mating surfaces is thin aluminum or copper. You will need to find soft copper or aluminum to do the trick.

Dennis

10-14-2007, 06:27 PM	#3
michel gravelle RCC Supreme Contributor I am: Michel G Join Date: Apr 2006 Location: Saint-Jerome Quebec Canada Feedback: 3 / 100% Posts: 3,316 Total Props: 12	Hi Mark Heres how to make another gasket Take a playing card , and an ink pad or ink from a pen . smeer it on the exhaust port of the engine . place it on the card right away , and you have an imprint of the gasket that you need . Cut out the gasket with an axacto knife #11 , for the holes use a sharpened piece of brass tubing at the end . This will last longer than any chemical that you use , the exhaust can hit up to 600 degrees F , and also can get caught in youre tank through the pressure fitting , it happened to me . Hope that this helps Mike __________________ M.A.A.C. 75640 Hitec Aurora 9 LT-40 LT-60 Alpha-40 Tiger-60 (90 ) ARF P-51 40 TF-P51 Giant KIT TopFite P-51 Giant ARF X 3 Hanger 9 SpitFire 60 ARF X2 TopFlite Elder-40 ( on the board ) Aero Works 540 T -60 The Ground came up and hit my plane
	.

10-14-2007, 06:47 PM	#4
AJCoholic RCC Supreme Contributor I am: Andrew Coholic Join Date: Sep 2002 Location: Timmins, Northern Ontario Radio of choice: JR 12X, 28X Feedback: 47 / 100% Posts: 12,277 Total Props: 61	FOr most of my engines, I prefer to use an aluminum or brass gasket cut from thin (2 to 5 thousandths) sheet stock. They do not compress over time and your muffler stays put. ALso, the metal gaskets do not get ruined like paper gaskets when you take the muffler off. RTV silicone can indeed be used on our mufflers as well. However I find most guys use WAY too much. The face of the exhaust and muffler are pretty flat and you are just trying to seal the very small inperfections that do not allow a gas tight seal. Only a very, very small amount of sealant is needed, spread evenly on the face of one of the two surfaces. WHen you attach thge muffler you should just see the slightest amount of squeeze out. I have taken engines apart that almost had the exhaust blocked by the large glob of silicone! Too much is no good. Just a little bit! AJC __________________ Andrew Coholic -MAAC #26287L 1/2A to giant scale, IMAC, SAM, R/C sport, turbine jets, Heli's... if its got a wing or two and an engine - I like it!
	.

10-14-2007, 06:49 PM	#5
scaleguy IMAC/SA or NOTHING! ★ Site Supporter ★ I am: JimmyD Join Date: Nov 2002 Location: Mississauga On, SE Zone Radio of choice: JETI Duplex DS-24 # of RCs: ? Feedback: 75 / 100% Posts: 16,820 Total Props: 59	Use Permatex "GOLD" it is better then the Red. Like Andrew said use it sparingly with a light coat on one surface or it may ooze into the exhaust port and restrict gasses. __________________ Jim Daly #IAmIMAC IMAC Sequence Committee Member MAAC #14323L IMAC #3678 *Windy you ask? I have Whitecaps on my Coffee, YOU be the Judge!*
	.

10-14-2007, 08:02 PM	#6
Vulcan1 RCC Supreme Contributor I am: John Davidson Join Date: Feb 2003 Location: Vulcan,Alberta Radio of choice: EVO(12), Futaba # of RCs: ? Feedback: 0 / 0% Posts: 2,927 Total Props: 0	A trick I learned was to take a coffee filter and put some high temp silicone on it. Spread it arond so it goes through the other side then sandwich it between wax paper and apply weight or in my case two pieces of ply with a couple of clamps. Let sit overnight and then make your gasket. Keep the rest of the sheet for making more gaskets. Try it. John __________________ John Davidson Keep the shiny side up and the wheels down
	.

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10-14-2007, 03:04 PM	#1
Short Circuit RCC Contributor I am: Mark B Join Date: Jun 2007 Location: Fisherville. Ontario Feedback: 0 / 0% Posts: 314 Total Props: 0	Exhaust Gasket Remove this ad - become a site supporter! The exhaust gasket is kaput in my GMS 47 Can I use RTV 108 silicon in place of the paper gasket ? Mark
	.

10-14-2007, 03:39 PM	#2
voyager_663rd RCC Supreme Contributor I am: Len, an RPAS pilot Join Date: Sep 2003 Location: Toronto, Ont Feedback: 1 / 100% Posts: 4,650 Total Props: 20	personally i use permatex red (can tire). Good to 343oC. Yours is good to 200oC. Try it and see what happens. Worst thing is it won't work and leak like crazy
	.

10-15-2007, 07:46 AM	#7
Ed Smith Guest Feedback: / % Posts: n/a Total Props: 0	With most engines where there is aluminum to aluminum contact of the muffler and case the two surfaces will vibrate against each other. This will cause pitting of the surfaces. Forget paper and chemicals. Do as Andrew says and use Brass or Aluminum gaskets. I prefer brass. Ed S
	.

10-15-2007, 08:48 AM	#8
Guest Guest Join Date: Sep 2002 Feedback: 0 / 0% Posts: 0 Total Props: 57	Thin copper works better and can be easily annealed each time it is removed so it re-seals again. Dennis
	.

10-15-2007, 01:45 PM	#9
Short Circuit RCC Contributor I am: Mark B Join Date: Jun 2007 Location: Fisherville. Ontario Feedback: 0 / 0% Posts: 314 Total Props: 0	Wow thanks for so many great replies !!! Now which one to try first................. Mark
	.

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