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  #1 (permalink)  
Old 02-03-2005, 06:59 AM
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TH350 leaking pan

installed new chrome pan with CORK gasket in september.
noticed tranny fluid on the floor in late december.
I retightened pan bolts.
now its febuary and it seems to still be weeping out of the gasket?
car is stored for winter but pan doesnt leak when I use the car.
anyone know a site where I can order a leak proof gasket?
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Old 02-03-2005, 07:06 AM
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I'll have to replace my pan gasket as well: I thought I'd use a new gasket and gasket sealer like Loctite blue. Any reason not to do that?

Martin
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Old 02-03-2005, 08:20 AM
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Do not use silicone sealants on transmission pans. Chrome pans leak. A lot. Remove the pan. Does it have a bead rolled in the center of the pan rail between the bolt holes? This gives the gasket some "bite". How flat is the pan rail? Overtightening pan bolts distorts the pan rail and oil leaks past the gasket. Check the flatness by placing the pan rail on a flat work surface and see if the pan is flush to the surface. Bolt hole distortion can be repaired using a ball peen hammer and striking the center of the holes to knock them back flush with the pan rail.
USE A TORQUE WRENCH WHEN TIGHTENING!! 8-10 ft-lb.

Grind off the chrome finish on the gasket surface of the pan.
Use a Farpak or Duraprene gasket. These are stiff gaskets, either black or tan colored. They also have fluid- tolerant sealers imbedded in their material which is released with trans temperature (heat). These gaskets will keep the oil in the pan, if the pan is flat and the surface is clean. It is worth the effort ot find them. Call a local trans shop and ask! I stock these gaskets all the time.

Trans fluid destroys silicone. Silicone in transmissions is a BAD thing.
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Old 02-03-2005, 08:46 AM
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i have a new pan with raised beads around gasket surface
cant seem to find a place that got any ther gasket but cork.
well ill try a bona fide tranny shop next.
or ill opt for a aluminum pan with cooling fins.
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Old 02-03-2005, 10:21 AM
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I've always used a bit of silicon (small amount) on the gasket for tacking purposes. You are probably just over-tightening the gasket, either splitting it or pushing it out. They dont need to be that tight. Its more important that they all be of the same torque to minimize them backing out. I also used a set of "locking" bolts that have a ring of teeth on them to help minimize backing out.
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Old 02-03-2005, 01:03 PM
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Loctite say their 5926 resists transmission fluid. Can anybody agree or deny? What other kind is recommended? I'm reluctant to not use any additional sealer.

Martin
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Old 02-03-2005, 01:10 PM
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Like chazmac sez.

No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealeNo sealer.No sealer.No sealer.No sealer.r.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.

Oh and no sealer either.
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Old 02-04-2005, 11:49 AM
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Quote:
Originally posted by stu
Like chazmac sez.

No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealeNo sealer.No sealer.No sealer.No sealer.r.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.No sealer.

Oh and no sealer either.
Hey Stu, do you think he should use some sealer?
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Old 02-04-2005, 11:58 AM
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ok i was thinking of Not using sealer and i didnt.
I hate cork gaskets with a passion!
now even more
darn it im gonna burn down al the cork trees
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Old 02-05-2005, 06:16 AM
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One problem with trans gaskets is that most that you buy with a filter change kit are too thin. The trans shops that I worked in had gaskets hanging on the wall by nails. If you try that with the paper thin gaskets in those kits, they will be distorted BIG TIME. The only gaskets that we used on auto trans were cork. The trick is to make sure that the pan is flat, the surfaces are clean of all oil and old gaskets, and the bolts are tightened properly. That means not too tight and tightened evenly. Any oil on the surfaces will keep the gasket from sealing.

As an added note. NO SEALER. Sealer will, besides getting inside the trans, cause real problems when it comes time to pull the pan off later. Keep in mind that the edges of the pan and trans case are very sharp. They will cut you very quickly when trying to get that sealer and gasket back off later.
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Old 02-05-2005, 06:47 AM
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Boy if this isn't a typical discussion... To achieve success, don't use cork / only use cork... don't use sealer / use a little sealer.

This is my experience... I used a cork gasket on my 4L60E, only because that is what happened to have been in the gasket/filter set I purchased at Kragen's. Forgot to torque the bolts down on the stock pan (they were hand tightened). When I serviced it, of course, it leaked. So then I tightened them. That cork gasket deformed all over the place. Of course, it still leaked. Got a black rubber one at Napa (Farpak or Duraprene ??? dunno). Cleaned up the mating surfaces squeaky clean, re-installed (no sealer). That was 4 days ago so I don't have much history but there are no leaks.
Seems to me (but I dunno) that cork should be OK but it would be important to install it clean and dry to help prevent distortion. That said, I doubt if I will ever use cork again.
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Old 02-05-2005, 08:00 AM
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one thing ive been doing for years on chrome pans is taking a wire wheel to the mating surface... it scuffs it up and makes for good sealing. i grew up with my dads shop using cork gaskets. but i persaonally prefer the black pan gaskets. much more forgiving. and yes, i also believe the mating surface for sealing up the tranny pan should be dry, and no sealer... ive seen results of people who have tried using sealer and they cant understand why it leaks...
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Old 02-05-2005, 11:20 AM
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For those who may want to use a sealer to hold the gasket in place I found that the size of the holes in the rubber gasket were such that I could 'thread' a few bolts here and there into the gasket to hold it in place.
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Old 02-05-2005, 01:04 PM
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It's a good thing I get trans fluid for only a dollar a quart..

My speedo gear leaks fluid... My pan leaks slowly.... I've given up on it, and its too cold to worry about.... Probably fix it in april.
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Old 02-05-2005, 06:22 PM
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HEY DAWG:

I fought that problem with a chrome pan till I was blue in the face. I finally found that problem was dip stick O ring was leaking and running down lip of pan looking like a gasket leak. Took me a year and about twenty gasket and sealers to find leak...Check else where to make sure it is pan gasket leaking... THERESA
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