Re: Trans. Pan Gasket Question
[Re: 6PAX]
#3086008
10/14/22 02:27 PM
10/14/22 02:27 PM
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Joined: Mar 2011
Posts: 3,069 Michigan
A727Tflite
master
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master
Joined: Mar 2011
Posts: 3,069
Michigan
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I just put the pan back on my 727 using a new rubber gasket and also a thin coat of Ultra Black. I tightened the pan bolts to 150 in/lbs per the book and assumed all was good and started cleaning up. Went back to the trans. to pick up some tools and happen to look at the pan and the gasket was squirting out from the pan in two spots (both corners on passenger side). Is 150 in/lbs. too much for a rubber gasket? I know people are gonna say I should have used the Mopar hard gasket but the last time I used one of those it leaked too so I just used the rubber gasket since I already had it. I loosened all the bolts and the gasket receded back into place on it's own so should I just snug the bolts up till they are snug? The backbone Mopar gasket does not leak. IF - you have an undamaged, flat pan flange, no damage to the case, etc. You can’t overtighten them either. Adding silicone to a rubber gasket just lubes them up allowing them to squirt out. If your pan leaked with the Mopar gasket it’s going to leak with the others unless you slop a tube of RTV all over the place.
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Re: Trans. Pan Gasket Question
[Re: A727Tflite]
#3086026
10/14/22 03:05 PM
10/14/22 03:05 PM
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Joined: Dec 2005
Posts: 11,540 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,540
Fulton County, PA
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Gasket or gasket maker. Not both. I prefer gasket. Specifically, the fiber style.Stamped steel pan has to be straight. 120 lbin. or so. No more than 150.
Last edited by CMcAllister; 10/14/22 03:12 PM.
If the results don't match the theory, change the theory.
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Re: Trans. Pan Gasket Question
[Re: 6PAX]
#3086028
10/14/22 03:07 PM
10/14/22 03:07 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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Rule #1: Never install a rubber gasket with RTV silicone. Why? Because rubber is not compressible... it is deformable. So, IF you apply RTV silicone spread across a rubber gasket, its the same as spreading grease across it. the gasket will simply slide and want to split/deform very easily. You will never find a gasket manufacturer with directions to apply RTV silicone across a rubber gasket. Rubber gaskets are always best installed DRY without any wet chemical.
Rule #2: Check for flatness... both surfaces must be flat (stamped pans, etc tend to have distortion, especially at the bolt holes... replace or flatten as needed.
Rule #3: Clean all threadings... so to reduce and eliminate unwanted friction.
Rule #4: Tighten to manufacturer's specifications... avoid over-tightening.
Remember, again, that rubber is not compressible... its deformable and only by about about 30% of its thickness... squeezed any more than that and it'll split apart. (Cork-rubber, by comparison, can be compressed 50%... more forgiving to out-of-flatness and irregular surface imperfections.)
I 'm a former gasket engineer from a major leading company... and I wrote the instructions within their gasket sets.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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