muffler leak

[Bobs]

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.

[j.8]

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

[Red Sky]

No gaskets. Just some red (heat rezistant) silicone.

[Bobs]

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.

[Bobs]

Are these mufflers supposed to seal without any gaskets?

[Red Sky]

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.

[Alfred]

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.