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Re: [GMCnet] porous aluminum tranny pan [message #326146 is a reply to message #326125] Sat, 18 November 2017 11:26 Go to previous messageGo to previous message
richshoop is currently offline  richshoop   United States
Messages: 190
Registered: April 2017
Karma:
Senior Member
You might consider cleaning the parts one more time, wait a bit for the inevitable drip, and using one of those UV flashlights look for the tell tale drip. Most automotive fluids include an fluorescent dye in them exactly for leak locating purposes.
----- Original Message -----

From: "Larry"
To: "gmclist"
Sent: Friday, November 17, 2017 6:26:41 PM
Subject: Re: [GMCnet] porous aluminum tranny pan

Ken Henderson wrote on Fri, 17 November 2017 19:55
> Karen,
>
> Thanks for reminding me that I haven't reported on my Ragusa pan coating
> results: After 3+ weeks of using the pan I painted inside and baked, I can
> report that I've lost about a pint of fluid...
>
> It's now obvious that the porosity, if it ever had any, is cured. But,
> there is leakage at the rear of the pan only, probably from the flange, but
> possibly from the chain cover. Because the leaks run down the side of the
> pan without leaving an easily detected trail, the drops on the flanges at
> the bottom of the pan appear to be coming through the aluminum -- they're
> NOT.
>
> I'm using a nicely made Felpro composition gasket, Permatex'd to the pan
> (but not the transmission). I did not paint the pan's flange, as someone
> suggested too late, but that aviation Permatex should certainly prevent any
> leakage there. So, I'm still keeping a drip tray under the transmission
> and don't know what to try next -- unless I R&R the chain cover and reseal
> it as well -- but Manny probably used Permatex on both sides of that
> gasket. :(
>
> Ken
> ​Drippy ​
> H.

Ken,

I've been chasing a leak for about a year now and finally discovered it in an odd place. If you open the hatch and look straight down at where the
cooler lines go into the trans, slightly above and slightly to the left of the inner line, I could see what looks like a bolt hole with the end of a
bolt slightly exposed. I have looked at two other transmissions that I have and neither has this bolt hole, only the trans in my coach. What I am
seeing is the end of a bolt that can only be found by dropping the trans and taking off the chain cover, so I have no idea what is for. It was
leaking just little , but enough to coat the trans pan, and everything else in the vicinity with trans fluid. Took about a pint every 500 mi, and did
a nice antirust job on the underside of my coach with many drops that reached the toad.

To fix it without taking the trans down, I used a Dremel tool with a right angle adaptor and a small diamond grinder. I first sprayed it with Brake
Clean, then did some roughing up of all of the surfaces in the area, along with sanding the flat surfaces around the hole. Then mixed up some JB
Weld, and spread it over the hole. Got about 100 miles on it now and leak is gone. Will see if it lasts.

If I can get the pics off of my phone, I'll post them on the photo site.

JWID and HTH

--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

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