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Old 09-02-2016, 09:25 AM   #1
SteveMD
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Default RTV Silicone instead of trans pan gasket?

When I bought parts for our Mazda 6 trans service, the Mazda parts guy gave me a tube of Mazda gray RTV sealant in place of a trans pan gasket. The car has been fine.

Now I need to seal another auto trans pan and have Toyota gray RTF sealant on hand P/N 00295-01281, specced for engine and trans sealing although it doesn't actually say auto trans.

While on another forum I saw where a guy there said to never use any form-in-place silicone product as it will interact with the trans fluid, pieces break off, etc.

What say you guys?
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Old 09-02-2016, 09:27 AM   #2
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If there is a gasket offered, use the gasket.
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Old 09-02-2016, 09:27 AM   #3
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Quote:
Originally Posted by tryingbe View Post
If there is a gasket offered, use the gasket.
No gasket was offered by the Mazda parts guy.
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Old 09-02-2016, 09:42 AM   #4
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Quite a few trans pans are RTV'd in place these days, just depends on the application. RTV has been used for trans pans and diff covers for decades, kinda doubt there's an issue with that. Usually the black is fine, handles the oil easily, gray is fine as well (just RTV'd the valve cover gaskets in place on the Dodge using the gray, don't want them to leak again....for a few months at least).

Shoot me a YMM in the one you're doing a pan on, I'll see if I can dig something up. ;)
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Old 09-02-2016, 11:06 AM   #5
lingon300k
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Just use the Toyota stuff on your E46 ZF transmission. (We're on the same other forum.)

Form in place gaskets are fine as long as you're careful to apply the gasket evenly and properly. The only risk is doing it wrong by putting a big, fat half inch bead all around the surface then squeezing it out into the trans when you mate the surfaces. On an RWD car like an E46, with the whole trans pan nicely exposed, it should be easy to mate them up. Maybe use a floor jack with a piece of wood to assist.

I believe the part number you mentioned is specifically made for an auto trans.
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Old 09-02-2016, 11:32 AM   #6
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Quote:
Originally Posted by SteveMD View Post
No gasket was offered by the Mazda parts guy.
Then I'm not sure I understand your question.

Other than RTV, what is your alternative?


Volvo uses anaerobic sealant for mating two cast aluminum surfaces.
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Old 09-02-2016, 11:50 AM   #7
Jimmy E. James
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Always use gasket if find one
ATP or somebody has I bet
Problem with silicone is applying not always the same from person to person
Silicone can get in filter sometimes even if careful
If nobody makes then choice is clear you have to use gasket from tube but I bet somebody does make
For transmission buy fresh tube of RTV with label that say ok for transmission, no ultra gray for trans
Never use old sealer on critical part
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Old 09-02-2016, 10:13 PM   #8
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If no gasket is available, I recommend Curil T if you can get it. Specifically designed for driveline applications and works phenomenally.
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Old 09-03-2016, 10:53 AM   #9
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It gets in the bolt holes, makes a mess, easy to apply too much. The last trans kit I bought was $12.
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Old 09-03-2016, 11:07 AM   #10
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I guess that I'm old school.......hell, I know I am because I'm old.

If I don't have a gasket, I will make one.

I have never depended solely on RTV to seal a pan gasket.
I don't even use it with gaskets that must seal oil, preferring instead Non-hardening Perma-Tex gasket sealant.

That's old school, but it has never failed me.
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