Air cooled flange sealant questions

[j_k_bisson]

I have been trying to seal up my kids 4 stroke air cool 1985 250cc suzuki 4 wheeler valve cover. It has developed an oil leak and I have tried using loctite 518 on it and it burns off and the leak gets worse. I believe this is because the locktite 518 is for liquid cooled motors and a lower temps than a air cooled motor.

Anyone know what the flange sealant for air cooled motors is? I would like to stick with locktite branded product. I have always had great results with them when used in the proper application.

 

[windy5849]

Re: Air cooled flange sealant questions

I have had success using the red high temp RTV gasket maker made by a company called Pro Seal.I'm sure Permatex or Locktite make a comparable product.It is rated for 650 degrees F or 340 degrees C.Hope this helps.

 

[j_k_bisson]

Re: Air cooled flange sealant questions

So you are telling me RTV sealant will hold up to an air cooled motor head temps? I thought that those head get above 650'F. Will RTV hold up to them?
I know locktite 518 does not. It burnt off faster than my last marsh mellow did roasting on a campfire!

Anyone know what kind of temps those heads get up to? The fins on the heads I mean....

 

[windy5849]

Re: Air cooled flange sealant questions

From the information I have read,air cooled motors run in the 200 to 300 degree range.The HIGH TEMP RTV is the one to use.I apologize if the running temps are different from what I read.Google air cooled engine temperature for the info I seen.

 

[ehenry]

Re: Air cooled flange sealant questions

Does than engine not use a gasket or rubber reusable gasket? Why not buy a new seal/gasket off the web? It couldnt be that expensive. My 87 Yamaha wheeler has an oval shaped rubber gasket that fits in a channel on the valve cover. I cant speak for a Suzuki.