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MA Gas Miniature Aircraft Gas Helicopter Support Forum


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Old 05-12-2007, 03:26 PM   #1
Bobs
 

Join Date: Apr 2006
Location: USA
Default muffler leak

I have a leak between my Hatori muffler and the metal spacer attached to the motor. I did not use a gasket when bolting the metal spacer to the motor nor did I use a gasket when bolting the muffler to the spacer. There were no gaskets included with the Hatori muffler so I assumed they weren't needed. Also, when I noticed there was a leak I tried tightening the bolts but they were tight. What's the proper procedure for sealing the muffler and spacer to the motor: gaskets or no gaskets? Thanks. BTW, this is on a Spectra G with a 231 TRM motor and it has about one third of a gallon through it so far.
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Old 05-12-2007, 03:59 PM   #2
j.8
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What about some copper gaskets ?

Well on monday or tuesday I can give you a more precise
answer ( thats when I get my Hatori #957 )

I have same helicopter and engien as you

BTW what about the rattling sound ?

Bo Denmark
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Old 05-12-2007, 04:07 PM   #3
Red Sky
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No gaskets. Just some red (heat rezistant) silicone.
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Old 05-12-2007, 04:22 PM   #4
Bobs
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Bo, the rattling sound turned out to be gear noise that was exaggerated because I was running without a canopy on. So it turns out that everything is okay in that department. As for the Hatori, I don't believe it will seal without some kind of gasket. Red Sky, where do you get heat resistant silicone and will it hold up to this kind of environment? Thanks.
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Old 05-12-2007, 05:16 PM   #5
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Are these mufflers supposed to seal without any gaskets?
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Old 05-13-2007, 03:58 AM   #6
Red Sky
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Bobs,
I bought this silicone from a shop that sells auto parts. You can see it between the engine body and the cylinder on G231. TRM use the same for sealing (I think).
I have at least 50 flights on my Spectra with no leaking at all.
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Old 05-14-2007, 07:29 AM   #7
Alfred
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Red is spot on.

Just get some Loctite 518 flange sealant Master Gasket.
Clean both sides with Alcohol/Methylated Spirit.
Apply just the thinnest film to both sides
Bolt together (no other gasket in between). Let sit overnight.
Done....no more leaks.
I haven't had a leak for years now, this tube will last me for another 20 years.
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