RTV Hi Temp vs. gasket ?? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-23-2001, 05:14 PM Thread Starter
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RTV Hi Temp vs. gasket ??

I'm tearing down another 1.6 and want to replace the rear main seal. Can I use RTV hi temp silicone instead of the gasket for the seal housing?

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post #2 of (permalink) Old 06-23-2001, 05:48 PM
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Re: RTV Hi Temp vs. gasket ??

Personally, I'm not a big fan of silicone sealants. The surfaces need to be completely free of oil. Additionally, silicones and oil don't typically mix well -- I believe some are referred to as 'oil tolerant' but once they begin to leak there is nothing that can be done except tear it down again. They also allow the gasket to slide when used together.

A lot of times a gasket will leak because it slipped during installation of because it was overtightened. Using some 'high tack' permatex (comes in a small can with a brush inside the lid) on the side of the gasket that will be placed on the part that comes off (just enought to hold the gasket in place) has worked well for me.

Might be more info. than what you were looking for -- to sum it up, I would use the gasket if I could get it.

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post #3 of (permalink) Old 06-23-2001, 10:21 PM Thread Starter
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Re: RTV Hi Temp vs. gasket ??

Thanks! Great info! I'll use a gasket........and some hi-tac....

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post #4 of (permalink) Old 06-23-2001, 11:56 PM
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Re: RTV Hi Temp vs. gasket ??

I agree, RTV is not good as an oil or grease sealant. for the reasons he said. I like a gasket because it actualy uses the oil to perfom the seal, it absorbs enough oil to swell and seal the gap. I have seen alot of people use RTV to hold their gaskets in place during assembly and have leaks and not understand why. They just sealed over the gasket's ability to absorb the oil or gear lube or whatever and the fluid slides right past the gasket that's why. I use any thing to hold the gasket in place till I can get a bolt in it. Put it on the side not on the face of the gasket. You can use your wife, sister or moms fingernail polish if you want to. I like it because it is easy to apply dries very fast and don't take up much space in my tool box and if I cant find it I can always find some in the old lady's bathroom.

"If you have ever used your wife's fingernail polish to hold a gasket in place"

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post #5 of (permalink) Old 06-24-2001, 12:18 AM
 
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Re: RTV Hi Temp vs. gasket ??

My first (cork) valve cover gasket had RTV on it and it leaked. Not knowing RTV was a bad idea I put another gasket on with RTV and torqued it down too tight. It leaked like there was no gasket on it at all! I was using 2 quarts a day. I replaced the gasket again - with a Genuine Suzuki factory (I.E. dealer part) gasket - and I used NO RTV and just did the bolts slightly over finger tight. It worked GREAT, no leakes no mess[img]/wwwthreads_images/icons/smile.gif[/img].

On a side note, the factory gasket was MUCH nicer than Felpro and it cost about the same...maybe a dollar or two more but the quality between the two is amazing!! Go dealer parts gaskets!!

Anyway, DON'T USE RTV! It sucks...

Give it to me; I'll break it.
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