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RTV vs. gasket sealant #2534084
02/12/12 03:36 PM
02/12/12 03:36 PM
Joined: Dec 2002
Posts: 42,304
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,304
New Jersey
Hi,

Doing a valve cover gasket job hopefully real quick, and noticed that the manual said to use sealant with the (rubber) gasket in a few spots.

Looking online, most of the time people seem to indicate use of RTV for this.

I have a tube of Permatex super high-tack gasket sealant (97B).

Is one better than the other? Seems that the naming of mine means that it is ideal, but again, so many seem to advocate use of RTV.

Suggestions?

Thanks!

Re: RTV vs. gasket sealant [Re: JHZR2] #2534089
02/12/12 03:44 PM
02/12/12 03:44 PM
Joined: Sep 2006
Posts: 19,479
Chicago Area
mechtech2 Offline
mechtech2  Offline
Joined: Sep 2006
Posts: 19,479
Chicago Area
Silicone RTV IS a gasket sealant.

On valve covers, many factories use a bit of RTV at the corners, or half moon seals .
RTV is great for this. Get a good automotive one. Clean off the oil and let it cure before starting.
How long? Temperature is a factor. If the car is winter cold, as long as possible, up to a day. In summer I still like a few hours.

Re: RTV vs. gasket sealant [Re: JHZR2] #2534127
02/12/12 04:09 PM
02/12/12 04:09 PM
Joined: Dec 2002
Posts: 42,304
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,304
New Jersey
but what if I have 97B in my shop? good enough? the same?

Re: RTV vs. gasket sealant [Re: JHZR2] #2534149
02/12/12 04:30 PM
02/12/12 04:30 PM
Joined: Aug 2006
Posts: 2,297
Michigan
Oil Changer Offline
Oil Changer  Offline
Joined: Aug 2006
Posts: 2,297
Michigan
Your 97B is an excellent choice. Even better since it is already paid for and at hand.

Permatex makes a dedicated product, but I wouldn't waste the time/money since you have something that will work.

http://www.permatex.com/products/Automot...nt_Dressing.htm

Re: RTV vs. gasket sealant [Re: JHZR2] #2534160
02/12/12 04:46 PM
02/12/12 04:46 PM
Joined: Mar 2010
Posts: 5,368
Iowa
The_Eric Offline
The_Eric  Offline
Joined: Mar 2010
Posts: 5,368
Iowa
Use RTV. High Tack seems to work better with paper type or close fit applications.


2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M
Re: RTV vs. gasket sealant [Re: JHZR2] #2534169
02/12/12 04:52 PM
02/12/12 04:52 PM
Joined: Aug 2008
Posts: 3,681
ks, wichita
morris Offline
morris  Offline
Joined: Aug 2008
Posts: 3,681
ks, wichita
i had a friend that worked for fel-pro. they would NOT warranty a valve cover gasket if rtv was used on it. they recommended a product like " Permatex super high-tack gasket sealant (97B)." i have used permatex #2 for decades it all ways works.

Re: RTV vs. gasket sealant [Re: morris] #2534177
02/12/12 05:01 PM
02/12/12 05:01 PM
Joined: Mar 2010
Posts: 5,368
Iowa
The_Eric Offline
The_Eric  Offline
Joined: Mar 2010
Posts: 5,368
Iowa
Originally Posted By: morris
i had a friend that worked for fel-pro. they would NOT warranty a valve cover gasket if rtv was used on it. they recommended a product like " Permatex super high-tack gasket sealant (97B)." i have used permatex #2 for decades it all ways works.


In some cases, they specify you use it, in fact they even supply it with certain kits.


2005 Lincoln Aviator 4.6 DOHC
2000 Honda Accord 2.3
2001 Hyundai Elantra 2.0
1979 Ford F-150 351M
Re: RTV vs. gasket sealant [Re: JHZR2] #2534289
02/12/12 06:44 PM
02/12/12 06:44 PM
Joined: Dec 2002
Posts: 42,304
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,304
New Jersey
I did the job with the gasket sealant.

I put some on the half-moon area on the head, it was freezing cold (literally) out, figured Id need to give some time for it to tack up - it turned tacky, and then started becoming non-tacky much sooner than I had planned. Hope I didnt screw that up...

Re: RTV vs. gasket sealant [Re: JHZR2] #2534706
02/13/12 07:43 AM
02/13/12 07:43 AM
Joined: Dec 2002
Posts: 42,304
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,304
New Jersey
Started the car today. Not sure if it was me, the cold, or something else, but it seems that I got 50 rpm of idle speed.

My idle was about 50 RPM low. After cleaning the IACV and its connections, etc., all idle issues stopped but it still looked a tiny bit low. Time will tell if that was the case.

The idle was always very smooth, but sometimes sensitive to load changes. These engines are sensitive to vacuum, pull the oil filler cap or dipstick and the engine will stall...

Since I used gasket sealant and not RTV, and since it wasnt as tacky as Id had liked, anything I should keep an eye out for, besides the usual oil leaking out, that would be indicative of an issue?

Re: RTV vs. gasket sealant [Re: JHZR2] #2534746
02/13/12 08:22 AM
02/13/12 08:22 AM
Joined: Dec 2002
Posts: 42,304
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,304
New Jersey
No dice - idle still at 650ish. Rock solid and smooth, so guess nothing changed...

Re: RTV vs. gasket sealant [Re: JHZR2] #2534766
02/13/12 08:38 AM
02/13/12 08:38 AM
Joined: Nov 2009
Posts: 4,021
New England
cchase Offline
cchase  Offline
Joined: Nov 2009
Posts: 4,021
New England
Gasket sealant IS RTV... RTV stands for "room temperature vulcanization".

Re: RTV vs. gasket sealant [Re: JHZR2] #2535038
02/13/12 01:06 PM
02/13/12 01:06 PM
Joined: Dec 2002
Posts: 42,304
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,304
New Jersey
OK, that helps... But then why does permatex sell 97B, versus all its RTV variants?

I can certainly understand varieties for certain applications, like gear oil, where the material needs to stand up. But to have RTV, AND all these other things too? Seems like so many redundant items, each must have its best use...

Re: RTV vs. gasket sealant [Re: JHZR2] #2535159
02/13/12 03:28 PM
02/13/12 03:28 PM
Joined: Oct 2009
Posts: 8,576
Ohio
mechanicx Offline
mechanicx  Offline
Joined: Oct 2009
Posts: 8,576
Ohio
Gasket sealant is RTV but is best for holding a gasket in place and helping it seal as its namesake is. It is not suitable to take the place of gasket maker RTV where you use it in place of gasket or to seal the area between two gaskets. I think that's the main thing. You can get away with using gasket maker on a gasket if spread thin and evenly but you can't use gasket sealer in lieu of a gasket. Of the two usually it's best to use the sealer on a gasket like you did.

Re: RTV vs. gasket sealant [Re: JHZR2] #2535195
02/13/12 04:05 PM
02/13/12 04:05 PM
Joined: Aug 2008
Posts: 3,681
ks, wichita
morris Offline
morris  Offline
Joined: Aug 2008
Posts: 3,681
ks, wichita
which cases? i started working on cars in 1965, be fore we even had RTV. i have only use permatex #2, it has NEVER failed me. end of story.

Re: RTV vs. gasket sealant [Re: mechanicx] #2535240
02/13/12 04:36 PM
02/13/12 04:36 PM
Joined: Dec 2002
Posts: 42,304
New Jersey
JHZR2 Offline OP
JHZR2  Offline OP
Joined: Dec 2002
Posts: 42,304
New Jersey
Originally Posted By: mechanicx
Gasket sealant is RTV but is best for holding a gasket in place and helping it seal as its namesake is. It is not suitable to take the place of gasket maker RTV where you use it in place of gasket or to seal the area between two gaskets. I think that's the main thing. You can get away with using gasket maker on a gasket if spread thin and evenly but you can't use gasket sealer in lieu of a gasket. Of the two usually it's best to use the sealer on a gasket like you did.


Great stuff, thanks!

The only spot where it is required is the half-moon seals that are part of the VC gasket in the back. That is where I used it, as well as around the bolt holes, as there was evidence of something having been used there on the old gasket.

the half moon is not two gaskets, just a spot where a big chunk of rubber fills a metal void.

Sounds like my product was the right choice. Hopefully my technique was OK.

Thanks again.

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