| Transmission Leak [message #322909] |
Tue, 29 August 2017 08:03  |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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A little update on the shifting issue I had. Had replaced the modulator and it did not seem to improve the shifting up and down from 3rd to 2nd so I took it into the truck and RV service center near me and had a transmission service done to it and now everything is back to normal, so it had to have been an issue with filter or level of fluid as well. It is a bit difficult to get a good reading on fluid level on this thing. Anyhow, glad it is back to shifting smoothly. I did notice that the transmission pan seems to be leaking a whole bunch more. Leaves a good square spot on the driveway. Is this something that is typical when a service is done, or did my service place muck something up?
Tom
76 Eleganza 2
Kansas City, Mo
Tom Geiger
76 Eleganza II
KCMO
[Updated on: Tue, 29 August 2017 08:04] Report message to a moderator |
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| Re: Transmission Leak [message #322910 is a reply to message #322909] |
Tue, 29 August 2017 08:10  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Perhaps they used an air impact on the pan bolts and dimpled the pan at each bolt hole. That reduces clamping on areas between bolt holes. You have to remove and set upside down on flat hard surface to see. Then carefully hammer the dimples back till granite smooth. Torque specs are important.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Transmission Leak [message #322912 is a reply to message #322909] |
Tue, 29 August 2017 08:33 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Have seen about a 1/2 dozen pans come loose in my life time after some mechanic had the pan off. I can't blame the mechanic as one of those was a tranny pan inhad off myself. The bolts torque is low and i think the gasket and heat cycles can make the bolts come loose.
So i always check transmission pan bolts a few times after they have been removed and replaced now.
However the other problem our old coaches have is torque converter leak down. When parked the fluid leaks out of the torque converter and over fills the pan, causing it to leave a mark on ground when parked.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Transmission Leak [message #322914 is a reply to message #322909] |
Tue, 29 August 2017 08:44 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Ok guys, will check on those items. Is there any special extra thick gasket that would seal things up better like we had for my Thorley headers I got from Jim K? Or is the stock gasket out of the service kit all we have?
Tom Geiger
76 Eleganza II
KCMO
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| Re: Transmission Leak [message #322917 is a reply to message #322909] |
Tue, 29 August 2017 09:04 |
77Royale
Messages: 461
Registered: June 2014
Location: Mid Michigan
Karma: 6
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Senior Member |
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Curious to know if anyone has had better sealing luck with the cork or rubberized gaskets?
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan
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| Re: Transmission Leak [message #322938 is a reply to message #322917] |
Tue, 29 August 2017 11:37 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Keep in mind some of the transmission bolts protrude into the fluid so they can leak around the bolt. In this case it would help to use a bolt with a built in washer and a little gasket with sealer. Just look real close at each bolt to see if it is the source of a leak.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Transmission Leak [message #322959 is a reply to message #322909] |
Tue, 29 August 2017 16:36 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Tom,
Suggest you:
- remove the pan and check the flange to see if there are dings around the bolt holes
- remove them with a two ball peen hammers - put one in the bolt hole and hit the flat face with the other
- replace the cork gasket - cork is OK
- replace the bolts with self locking flange bolts http://tinyurl.com/y99jnfgk
- coat the pan flange with Permatex Aviation Form-A-Gasket No. 3 Sealant http://tinyurl.com/y7zmy4rw
- put the cork gasket on the pan flange and coat it with Permatex Aviation Form-A-Gasket No. 3 Sealant
- install the pan on the transmission case and hand tighten the bolts lightly
- torque the bolts to 12 ft lb
- service the transmission
- go for a test drive
- have a beer when you get home to celebrate fixing the problem
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of tom geiger
Sent: Tuesday, August 29, 2017 11:03 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Transmission Leak
A little update on the shifting issue I had. Had replaced the modulator and it did not seem to improve the shifting up and down
from 3rd to 2nd so I
took it into the truck and RV service center near me and had a transmission service done to it and now everything is back to normal,
so it had to
have been an issue with filter or level of fluid as well. It is a bit difficult to get a good reading on fluid level on this thing.
Anyhow, glad it
is back to shifting smoothly. I did notice that the transmission pan seems to be leaking a whole bunch more. Leaves a good square
spot on the
driveway. Is this something this is typical when a service is done, or did my service place muck something up?
Tom
76 Eleganza 2
Kansas City, Mo
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: Transmission Leak [message #322968 is a reply to message #322909] |
Tue, 29 August 2017 19:04 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Ah, well there is my problem Rob. My sequence of events is backwards when I do work on Sugar Pie. I start with the beer and then go on to the next steps!
Tom Geiger
76 Eleganza II
KCMO
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| Re: Transmission Leak [message #322973 is a reply to message #322909] |
Tue, 29 August 2017 20:16 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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In some cases, if the pan bolts are over tightened, the gasket can squeeze out (or in, which is harder to see) causing a leak. I had this happen with a Gary Rockwell pan that I never could get to seal right. When I traded it in to Jim K for a Ragussa pan, he sent me a FelPro gasket that had the perfect size holes in it, and sealed really well.
I recently did this job again, and used the gasket that came in the filter kit (also from Jim K. and it sealed perfectly as well. I prefer to not use any type of gasket sealer if I can get away with it, due to the clean-up issues the next time. I did follow the manual torque spec of 12 foot pounds and it is nie and tight with no leaks.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: Transmission Leak [message #326328 is a reply to message #322909] |
Sat, 25 November 2017 13:28 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Ok, so now I'm in it. Doing the transmission pan thing. Had taken it yo a local truck and RV service center and that was not sucessfull after their third attempt, so I'm just going to follow your all good direction and do it myself. The dang thing leaked like a sive after their third attempt. So here I go. Got the pan off and I definstly see some dippling at the bolt holes. Going to try to hammer those out. I do see those locations on the back flange where the lip edge was cut out for some reason. Not much edge there to seal up. Going to just isr a rubber composite gasket to see if it will sral. Keep my fingers crossed.
Tom Geiger
76 Eleganza II
KCMO
[Updated on: Sat, 25 November 2017 13:30] Report message to a moderator |
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| Re: [GMCnet] Transmission Leak [message #326329 is a reply to message #326328] |
Sat, 25 November 2017 14:12 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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When working with the stock metal pan, one must turn the pan upside down
and have a steel narrow bar under the bolt holes and use a ball peen hammer
and level it out.
Not a bad Idea to use some sealent aroung the gasket holes and never over
tighten.
Yo might want to check around the holes that leak as there might be a
remote possibility of a crack
On Sat, Nov 25, 2017 at 11:28 AM, tom geiger wrote:
> Ok, so now I'm in it. Doing the transmission pan thing. Had taken it yo a
> local truck and TV setvice center and that was not sucessfull after their
> third attempt, so I'm just going to follow your all good direction and do
> it myself. The dsng thing leaked like a sive after their third attempt. So
> here I go. Got the pan off and I definstly see some dippling at the bolt
> holes. Going to try to hammer those out. I do see those locations on the
> back
> flange where the lip edge was cut out for some reason. Not much edge there
> to seal up. Going to just isr a rubber composite gasket to see if it will
> sral. Keep my fingers crossed.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Transmission Leak [message #326330 is a reply to message #326329] |
Sat, 25 November 2017 15:35 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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When the fluid level increases as the torque converter bleed down, the filler tube will leak past the existing O ring and drain fluid after a week or two. We put some sealent on the O ring and tube after wiping it clean and that stops the leak.
Quote:
Transmission Leak Tue, 29 August 2017 06:03
tgeiger
Karma:
A little update on the shifting issue I had. Had replaced the modulator and it did not seem to improve the shifting up and down from 3rd to 2nd so I took it into the truck and RV service center near me and had a transmission service done to it and now everything is back to normal, so it had to have been an issue with filter or level of fluid as well. It is a bit difficult to get a good reading on fluid level on this thing. Anyhow, glad it is back to shifting smoothly. I did notice that the transmission pan seems to be leaking a whole bunch more. Leaves a good square spot on the driveway. Is this something that is typical when a service is done, or did my service place muck something up?
Tom
76 Eleganza 2
Kansas City, Mo
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Transmission Leak [message #326344 is a reply to message #322909] |
Sun, 26 November 2017 08:30 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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Crap guys, sorry. I need to learn how to copy and paste correctly on my phone. Was just trying to past the proceedure Bob posted up.
Jim, when you talk about putting some sealant around the bolts. Are you saying to do this on both sides of the gasket at the bolt locations or are you saying dab a glob on the hole before the bolt goes in?
Tom Geiger
76 Eleganza II
KCMO
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| Re: Transmission Leak [message #326347 is a reply to message #322909] |
Sun, 26 November 2017 10:29 |
tgeiger
Messages: 518
Registered: February 2006
Location: kansas city
Karma: -1
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Senior Member |
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Jim, when you say take some gasket seal and dab it at the bolts, are you sayinging I do a circle around the bolt holes to tack the gasket and flange together or just glob some at the bolt hole before the bolt goes in?
Tom Geiger
76 Eleganza II
KCMO
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| Re: [GMCnet] Transmission Leak [message #326351 is a reply to message #326347] |
Sun, 26 November 2017 12:40 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Whenever we have problems, we tend to over do things just to be sure. Yes
putting on sealer on both sides cannot be bad.
On Sun, Nov 26, 2017 at 8:29 AM, tom geiger wrote:
> Jim, when you say take some gasket seal and dab it at the bolts, are you
> sayinging I do a circle around the bolt holes to tack the gasket and flange
> together or just glob some at the bolt hole before the bolt goes in?
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: Transmission Leak [message #326402 is a reply to message #326376] |
Mon, 27 November 2017 10:58 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Senior Member |
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On my transmission some were thru bolt holes and some were not. The thru ones needed a flange bolt and gasket or sealent so they wouldn't weep fluid.
Roy Keen
Minden,NV
76 X Glenbrook
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