Home » Public Forums » GMCnet » porous aluminum tranny pan
Re: [GMCnet] porous aluminum tranny pan [message #324317 is a reply to message #324316] |
Sun, 24 September 2017 18:35 |
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Matt Colie
Messages: 8547 Registered: March 2007 Location: S.E. Michigan
Karma:
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Senior Member |
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KB wrote on Sun, 24 September 2017 19:08Thanks Jim. I was concerned about the glyptal being able to handle the heat of our application,
so your observation is helpful. I recall Manny saying something about seeing 300F temps in there
at one point, though I can't remember where in the system. That made me concerned the glyptal might not hold up to a
heavy vehicle going up and down big hills with a towd... I think there are alternative products that can
handle the heat and the ATF, but I haven't found a definitive enough version yet. "Silver Seal Fluid Weld"
can supposedly do the job, but it appears to be a thick paste, is just as expensive as glyptal, but
can be bought in smaller quantities.
It appears virtually all modern aluminum cast automotive parts are pre-sealed by various industrial processes,
but those don't typically lend themselves to DIY work. I've also read that in the past, GM, etc, used epoxy paste
or RTF for leaky castings. A paint would be a lot easier. I'll be very interested to hear how Ken's experiment turns out.
thanks,
Karen
1975 26'
Karen,
The processes used to seal porous castings is costly and time consuming (the same thing as costly to manufacturing). Unfortunately, porous aluminum or magnesium castings are relatively easy to make, but they are not at all desirable. So, most of our casting suppliers (4 total, but one has gone under - that is the one I worked for a division of) set up testing rigs that use high pressure air and a devices to determine leak rate. If even a small portion of the population does not pass, they all get coated. While this is happening, manufacturing is screaming about everything and the clients (me this last time) are just sitting there and pointing to the contract that says "finished castings shall not leak fluids at a detectable level".
I am personally fond of water glass (sodium silicate) as a sealant because I have never seen in fail once the impregnation process is complete. It has no temperature or solubility issues that I know of.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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porous aluminum tranny pan
By: KB on Thu, 21 September 2017 23:02
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: Grrumpy on Fri, 22 September 2017 17:49
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Re: [GMCnet] porous aluminum tranny pan
By: USAussie on Fri, 22 September 2017 07:18
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Re: porous aluminum tranny pan
By: jricke on Fri, 22 September 2017 08:22
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Re: porous aluminum tranny pan
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Re: porous aluminum tranny pan
By: jhbridges on Fri, 22 September 2017 08:48
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Re: porous aluminum tranny pan
By: TR 1 on Fri, 22 September 2017 09:09
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Fri, 22 September 2017 11:07
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Re: [GMCnet] porous aluminum tranny pan
By: Kosier on Fri, 22 September 2017 11:57
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: richshoop on Sat, 23 September 2017 00:15
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Sun, 24 September 2017 18:08
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Sun, 24 September 2017 20:53
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: powerjon on Sun, 24 September 2017 09:10
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: USAussie on Sun, 24 September 2017 16:43
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Re: [GMCnet] porous aluminum tranny pan
By: Adrien G. on Sun, 24 September 2017 22:03
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Re: [GMCnet] porous aluminum tranny pan
By: USAussie on Fri, 22 September 2017 16:02
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Fri, 22 September 2017 17:15
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Fri, 22 September 2017 17:31
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Re: [GMCnet] porous aluminum tranny pan
By: USAussie on Fri, 22 September 2017 21:00
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Re: porous aluminum tranny pan
By: KB on Fri, 22 September 2017 11:01
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Re: porous aluminum tranny pan
By: TR 1 on Fri, 22 September 2017 11:26
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Re: porous aluminum tranny pan
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Re: porous aluminum tranny pan
By: Aaron on Sun, 24 September 2017 19:30
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Re: [GMCnet] porous aluminum tranny pan
By: k2gkk on Sun, 24 September 2017 19:49
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Sun, 24 September 2017 21:18
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Re: [GMCnet] porous aluminum tranny pan
By: midlf on Mon, 25 September 2017 08:55
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Mon, 25 September 2017 10:13
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Re: [GMCnet] porous aluminum tranny pan
By: Dennis S on Mon, 25 September 2017 11:18
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Re: [GMCnet] porous aluminum tranny pan
By: Dennis S on Mon, 25 September 2017 11:21
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Re: [GMCnet] porous aluminum tranny pan
By: midlf on Tue, 26 September 2017 03:42
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
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Re: porous aluminum tranny pan
By: Aaron on Mon, 25 September 2017 11:04
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Re: porous aluminum tranny pan
By: dr.diesel on Mon, 25 September 2017 16:55
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Re: [GMCnet] porous aluminum tranny pan
By: USAussie on Mon, 25 September 2017 17:19
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Re: [GMCnet] porous aluminum tranny pan
By: jimk on Tue, 26 September 2017 00:44
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Re: porous aluminum tranny pan
By: KB on Fri, 17 November 2017 15:48
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: jimk on Fri, 17 November 2017 20:16
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Re: [GMCnet] porous aluminum tranny pan
By: Larry on Fri, 17 November 2017 20:26
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Re: [GMCnet] porous aluminum tranny pan
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Re: [GMCnet] porous aluminum tranny pan
By: KB on Sat, 18 November 2017 14:52
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Re: [GMCnet] porous aluminum tranny pan
By: tphipps on Sat, 18 November 2017 16:38
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Re: porous aluminum tranny pan
By: Larry on Fri, 17 November 2017 21:08
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Re: [GMCnet] porous aluminum tranny pan
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