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Old 01-03-2021, 05:04 PM   #1
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Changing the intake gasket on my KA24DE. Would anyone recommend putting RTV sealant on the water jackets, or not?
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Old 01-03-2021, 05:44 PM   #2
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Extra insurance isn't a bad thing. I've always used a thin coat of RTV on gaskets that need it.
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Old 01-03-2021, 10:08 PM   #3
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I always use RTV, if for no other reason, to hold the gasket in place while I’m installing the parts.
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Old 01-03-2021, 11:54 PM   #4
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Experience has taught me that RTV is not a good idea in/on an automatic transmission. Years ago I used some to reseal a transmission pan. Months later it deteriorated and clogged my ATF fluid pump. That sucker would pump all the fluid out through the dipstick tube, but only when when I was wearing a nice shirt. When I took the pump loose and blew air through its ports, little chunks of RTV came out. Blow, rinse, repeat.
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Old 01-04-2021, 12:23 AM   #5
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I'm a big fan of #3 aviation sealant. Not just for coolant passages but also for sealing oil passages. Nothing against RTV, I just don't like cleaning it off mating surfaces. It also tends to keep rubber gaskets nice and pliable so they come off in one piece if you ever need take something apart again.

Nunya, that same stuff works quite well for transmission pans. Just paint a thin coat of it onto the gasket. You don't need much. I don't know if it's technically resistant to ATF but I've never seen one leak afterwards. I did a transmission service on my daily shortly after I got it and the pan is still bone dry 5+ years later.
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Old 01-04-2021, 12:43 AM   #6
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I pretty much only use it on intakes and thermostat housings/waternecks.
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Old 01-04-2021, 01:00 AM   #7
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Ultra-Black or Permatex Part 2b.
THIN coat.


(Thin coat)
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Old 01-04-2021, 01:16 AM   #8
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Both sides of the gasket?
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Old 01-04-2021, 04:08 AM   #9
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Permatex #2 (the dark green goo) for me! Unless RTV is the only option ...


FYI -- Transmission pan gaskets historically used no sealant. So clean both the pan's and the case's well. If a thin metal pan, slight reverse dimpling of the bolt-holes (using the peen of a ball-peen hammer) is an old trick.
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Old 01-04-2021, 05:42 AM   #10
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Quote:
Originally Posted by GM4WALLS View Post
Both sides of the gasket?



I do both sides typically but you also have to make sure both sides are perfectly clean, one bump can still cause an intake leak....


Remember, THIN is the key there...


Gaskets typically don't need it, they are merely there to smooth the mountains and ridges of metal (at a microscopic level).


But the thin coat is merely insurance.


FYI Ultra black - superb and easy to remove.


Permatex 2B - SUPER SUPERB and EXTREMELY difficult to remove
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