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Gasket vs RTV? #5446169 06/04/20 02:29 PM
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supton Online Content OP
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Thinking I botched this one...

I have a slow ATF leak, I noticed that I didn't tighten the bolts all the way from when I did it 3 years ago. Figured the Autozone rubber gasket was probably toast after 80k (no squish left) so after some reading here it sounded like Permatex Ultra Grey might be best. Pulled the pan, cleaned it best I could, put a thin bead around the pan perimeter, on the raised lip that this has. Put on finger tight, waited an hour, torqued to 5 ft-lbs. I then disobeyed instructions and filled. I haven't started it but while messing around with other things I noticed that I seem to have a leak from around one of the bolt holes... I have to double check on this before I condemn it (got dragged away).

Where it's not a dead flat surface on the pan is a gasket better? As in, RTV best on flat not convex surfaces?

Last edited by supton; 06/04/20 02:29 PM.

2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Gasket vs RTV? [Re: supton] #5446172 06/04/20 02:37 PM
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kschachn Online Content
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Does the pan have the raised bumps on the perimeter that limit the squish of the gasket when tightening?


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: Gasket vs RTV? [Re: kschachn] #5446177 06/04/20 02:43 PM
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supton Online Content OP
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Originally Posted by kschachn
Does the pan have the raised bumps on the perimeter that limit the squish of the gasket when tightening?

Has raised surface, but they are right between the bolts. Not to limit squish on the gasket, but rather they look like the "bite into" the gasket material, compressing it it looks like.

Didn't think to get a photo. Hoping I don't need to!


2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Gasket vs RTV? [Re: supton] #5446182 06/04/20 02:53 PM
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kschachn Online Content
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Does it look like this? This kind of pan won't seal correctly with RTV no matter what. Also if your bolt holes are stretched out and aren't flat it won't seal either.

[Linked Image from felpro.com]


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: Gasket vs RTV? [Re: kschachn] #5446184 06/04/20 02:54 PM
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supton Online Content OP
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Originally Posted by kschachn

Does it look like this? These are actually flattened down:

[Linked Image from felpro.com]

Nope. Just realized, I had saved a DIY on this, and it has a photo:

[Linked Image]

Edit: I ran the Permatex right on that rail, and then around the bolt, but not around the bolt twice (didn't want any to fall into the pan.

Last edited by supton; 06/04/20 02:55 PM.

2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Gasket vs RTV? [Re: supton] #5446188 06/04/20 02:57 PM
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kschachn Online Content
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Ahh well that is the correct pan for RTV. Most service manuals show how to apply the material IRT bolt holes.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: Gasket vs RTV? [Re: supton] #5446192 06/04/20 03:05 PM
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I prefer gaskets myself. You are right in making sure the pan flanges are flat if you do use a gasket. Not easy to get a truly consistent bead of RTV like the machines in the factory does. I have seen some RTV mess in my day from people that believe that more is better and also don't have a torque wrench and torque pan,transmission pan and valve cover gaskets to something north of 30 foot pounds it seems.

Re: Gasket vs RTV? [Re: supton] #5446193 06/04/20 03:06 PM
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IF the mating surfaces are OK , in general , I prefer a gasket , if available .

I usually use sealant to adhere the gasket to the " removable " part . This holds the gasket in place during assembly .

If you ever have to do it again , it is easier to remove the gasket / sealant from the " removable " part , than from the " fixed " part .


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God bless
Re: Gasket vs RTV? [Re: supton] #5446207 06/04/20 03:29 PM
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supton Online Content OP
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Doah! definitely looks like a fail, nice puddle out there. Time to drain and pull, and decide if I want to get a gasket.


2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Gasket vs RTV? [Re: supton] #5446229 06/04/20 04:04 PM
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Found the issue. Didn't goop around the bolt holes, and that's precisely where it leaked. Had a good seal elsewhere.


2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Gasket vs RTV? [Re: supton] #5446230 06/04/20 04:05 PM
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That pan should seal fine with RTV.

Bolts need to be torqued immediately with Toyota RTV, not sure about the Permatex product. But I have never heard of anyone letting RTV "skin" before tightening the bolts.

Try it again, but with a longer cure time?


2020 Ram 1500 5.7L eTorque - <1K - Factory Fill
2011 Toyota Prius 1.8L - 209K - Valvoline Premium Blue Restore 10W-30
2007 Honda Accord 2.4L - 146K - Valvoline Premium Blue Restore 10W-30
Re: Gasket vs RTV? [Re: supton] #5446235 06/04/20 04:10 PM
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I think I see the problem--I should have gone 360 around the bolt. I went around the outside, thinking I didn't want to chance any being on the inside and falling off. Right amount used, a 2mm wide bead or so, but it should have done 360 around.

This is the bolt that was leaking--I had overfilled it, as I was going to run it and pump out thro the cooler. So with a very high pan level... it leaked. So I think it'll be worth a second shot.

[Linked Image]


2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Gasket vs RTV? [Re: supton] #5446264 06/04/20 04:58 PM
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After having to dealing with a coolant system leak, even with new components, I've become a fan of hylomar, as a supplement to a gasket if needed.

It's tacky, so it can be used to keep gaskets aligned, and doesn't set or harden, so it won't have to be scraped off the next time it's pulled apart. It's also good enough to act as a gasket on its own, under most circumstances. Oil and fuel resistant.

No matter the goop, moar is not better.

Re: Gasket vs RTV? [Re: supton] #5446381 06/04/20 07:49 PM
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I think I got it. It's leaking worse now it seems, but I don't see from where, and I don't care at the moment--it could be that it's running off from various places.

I did find I left the crush washer off the diff fill plug so it's possible that is one of the leaks. Will have to jack up and replace that.


2011 Toyota Camry, base, 2.5L/6MT, 206k
2010 Toyota Tundra DC, 4.6L/6AT, 160k
2003 CRV, 2.4L/4AT, 161k
1999 Toyota Camry LE, 2.2L/4AT, 225k
Re: Gasket vs RTV? [Re: supton] #5446388 06/04/20 08:02 PM
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Is this on your Camry ??


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