How to prevent exhaust gases leaking from Y-Pipe - HCS Snowmobile Forums

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Old 02-10-2008, 12:19 PM   #1 (permalink)
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I've tried the Permatex Ultra Black High heat silcone stuff, Permatex recommended the Ultra Copper as its a bit higher temperature rated and can hold up to vibration better vs. the Ultra Black. Neither have worked. I even put in a new Grafoil gasket, it still leaks at the Y-Pipe and Single pipe junction. The springs are so tight that I can barely get them on, so I don't think the springs are the issue?

Any sugguestions - are there any other options I can try - maybe a better Grafoil gasket? Maybe one off a different sled?
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Old 02-10-2008, 01:05 PM   #2 (permalink)
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After using the permatex did you let it set up before starting the sled? I have had great luck with it. Check the "Y" pipe for cracks.
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Old 02-10-2008, 01:32 PM   #3 (permalink)
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I use the permatex red high temp. Stuff works awesome. I agree with sabercat. After putting it on let it sit and dry. Start it up and get it hot, then shut it off and let it cool down and it makes a perfect seal
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Old 02-10-2008, 01:39 PM   #4 (permalink)
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I let it set-up a minimum of 24 hours. It made a great seal, but after the pipes get hot it always burns off then starts to leak. There are no cracks in the pipes.
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1990 Polaris 340 Sport
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Old 02-10-2008, 05:08 PM   #5 (permalink)
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Use the red/orange stuff. Won't burn off
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Old 02-10-2008, 05:37 PM   #6 (permalink)
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http://www.permatex.com/products/automotiv...cone_Gasket.htm


Here is what I just tried:
Permatex® Ultra Copper® Maximum Temperature RTV Silicone Gasket Maker

OEM specified. Highest operating temperatures for 4-cylinder, turbocharged or high-performance engines. The most advanced, high temp RTV silicone gasket available. Sensor-safe, low odor, noncorrosive. Superior adhesion. Three times more oil resistant than conventional silicones; eight times more flexible than cut gaskets. Temperature range -75°F to 700°F (-59°C to 371°C) intermittent; resists auto and shop fluids and vibration.

Suggested Applications: Exhaust manifolds/ headers, valve covers, oil pans, timing covers, water pumps, thermostat housings


I haven't tried this one, but the Ultra Copper can handle higher heat?? According to the notes, the Ultra Copper is good for exhaust manifolds as well.
Permatex® High-Temp Red RTV Silicone Gasket

OEM specified. Formulated for hi-temp applications, or heavy-duty use (such as towing, etc.). Replaces almost any cut gasket by making reliable “formed-in-place” gaskets that resist cracking, shrinking and migrating caused by thermal cycling. Coats pre-cut gaskets to increase reliability. Temperature range -65ºF to 650ºF (-54°C to 343°C) intermittent; resists auto and shop fluids. First generation 1970-1980 gasket maker.

Suggested Applications: Valve covers, oil pans, timing covers, water pumps, thermostat housings, transmission pans
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1999 XC 700 SP
1994 XLT SP
1990 Polaris 500
1990 Polaris 340 Sport
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Old 02-10-2008, 07:21 PM   #7 (permalink)
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Dunno what to tell ya. I've had my pipe on and off countless times. Run a thin layer of the permatex red silicone on the donuts, put the pipe on, let it sit over night if possible and i've never had an issue with leaks. One time i started it and the Y pipe donut leaked a tiny bit. I shut it down, let it totally cool down and it sealed up. Try it
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Old 02-10-2008, 09:28 PM   #8 (permalink)
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try shimming the pipe up or down, working with either the saddle or by shimming the silencer/muffler up or down so that the pipe to Y junction makes a better seat.
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Old 02-11-2008, 09:17 AM   #9 (permalink)
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I'll check the alignment of the pipe/Y-pipe again, but I believe its aligned pretty good right now.


A person on Arctic Chat mentioned trying to wrap aluminum foil around the donut a few times - he said others have done it and it sealed up good. Thoughts on this - can aluminum foil hold up to those high of temperatures?
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1994 XLT SP
1990 Polaris 500
1990 Polaris 340 Sport
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Old 02-11-2008, 01:05 PM   #10 (permalink)
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Just an idea, but on all of our race sleds we double up the springs and never have an issue with leaking.
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