Transmission Leak

T

tom geiger

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Dec 31, 2006
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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.
 
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

> 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
http://www.appliedgmc.com
1-800-752-7502
 
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
mailto:jimk
http://www.appliedgmc.com
1-800-752-7502
 
I chased a leak for over a year. Here is what I found. Open the engine hatch and look down at the cooler lines going into the transmission. If you
are seeing fluid laying in that trough between the back chain cover the engine block, the fluid may be coming from a bolt hole that is located near
the inner trans cooler line. Not all 425 transmissions have this. Check out this link if you see trans fluid in that trough.

http://www.gmcmhphotos.com/photos/transmission-leak/p63991-odd-trans-leak.html

If no fluid in the trough, don't bother looking at this.

HTH

--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
 
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?
 
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?
 
Whenever we have problems, we tend to over do things just to be sure. Yes
putting on sealer on both sides cannot be bad.

> 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
http://www.appliedgmc.com
1-800-752-7502
 
I don't think that any of the bolts that hold the trans pan in place are "through" bolts. Without a drain plug in the pan, you must take all of the
bolts out and lower the pan to drain. If the bolt holes in the trans were through holes, when you take the bolt out, trans fluid should pour out of
the hole...It doesn't. I have found that trans fluid does not come out until all bolts are out and you crack the pan loose from the trans. Then it
POURS out!! So the last time I took the pan down, I looked for through bolt holes and found none. I'm not sure that extra silicone sealer at each
bolt would do anything, but then it won't hurt either. JWIT
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
 
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
 
My leaks continue also. Yesterday I tried George Z.'s suggestion to put
O-rings on the suspect bolts. Before I even got them torqued, the O-rings
could be squeezing out, so I abandoned that -- I wasn't convinced that ATF
was coming out of my all-deadheaded bolt holes.

At the rear of the pan, where all my leakage occurs, the pan gasket was
1/16"-1/8" beyond the pan flange, extending all the way to the vertical
surface where the chain cover seats. In an effort to determine whether the
leaks are coming from the transmission pan or the chain cover, I trimmed
that gasket back to the pan flange. Today I checked the results -- the ATF
is almost certainly coming over the top of the pan gasket -- where I didn't
use any sealant. I'll continue to keep the drip pan below the transmission
until the next ATF change. Then, I'll probably seal both sides of the
gasket -- as much as I hate the thought of having to clean the transmission
flange in the future. With my drain plug and external filter, if that
solves the leak, then in recognition of my age, I'll probably never change
it again -- just hoping I get a chance to seal both sides. :-)

Ken H.

> 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.
> --
 
Ken,
Your still young, so plan on doing more, OK.
I prefer to drop the pan as I can observe the residue at the bottom of the
pan and look at it with bright light for meal particles.

On Mon, Nov 27, 2017 at 3:45 PM, Ken Henderson
wrote:

> My leaks continue also. Yesterday I tried George Z.'s suggestion to put
> O-rings on the suspect bolts. Before I even got them torqued, the O-rings
> could be squeezing out, so I abandoned that -- I wasn't convinced that ATF
> was coming out of my all-deadheaded bolt holes.
>
> At the rear of the pan, where all my leakage occurs, the pan gasket was
> 1/16"-1/8" beyond the pan flange, extending all the way to the vertical
> surface where the chain cover seats. In an effort to determine whether the
> leaks are coming from the transmission pan or the chain cover, I trimmed
> that gasket back to the pan flange. Today I checked the results -- the ATF
> is almost certainly coming over the top of the pan gasket -- where I didn't
> use any sealant. I'll continue to keep the drip pan below the transmission
> until the next ATF change. Then, I'll probably seal both sides of the
> gasket -- as much as I hate the thought of having to clean the transmission
> flange in the future. With my drain plug and external filter, if that
> solves the leak, then in recognition of my age, I'll probably never change
> it again -- just hoping I get a chance to seal both sides. :-)
>
> Ken H.
>

>
> > 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.
> > --
> _______________________________________________
> 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
http://www.appliedgmc.com
1-800-752-7502
 
The next time you have the pan off, weld in a drain plug. Easier and
cheaper than an aluminum pan !

Mike from NS

> Ken,
> Your still young, so plan on doing more, OK.
> I prefer to drop the pan as I can observe the residue at the bottom of the
> pan and look at it with bright light for meal particles.
>
> On Mon, Nov 27, 2017 at 3:45 PM, Ken Henderson

>
> > My leaks continue also. Yesterday I tried George Z.'s suggestion to put
> > O-rings on the suspect bolts. Before I even got them torqued, the
> O-rings
> > could be squeezing out, so I abandoned that -- I wasn't convinced that
> ATF
> > was coming out of my all-deadheaded bolt holes.
> >
> > At the rear of the pan, where all my leakage occurs, the pan gasket was
> > 1/16"-1/8" beyond the pan flange, extending all the way to the vertical
> > surface where the chain cover seats. In an effort to determine whether
> the
> > leaks are coming from the transmission pan or the chain cover, I trimmed
> > that gasket back to the pan flange. Today I checked the results -- the
> ATF
> > is almost certainly coming over the top of the pan gasket -- where I
> didn't
> > use any sealant. I'll continue to keep the drip pan below the
> transmission
> > until the next ATF change. Then, I'll probably seal both sides of the
> > gasket -- as much as I hate the thought of having to clean the
> transmission
> > flange in the future. With my drain plug and external filter, if that
> > solves the leak, then in recognition of my age, I'll probably never
> change
> > it again -- just hoping I get a chance to seal both sides. :-)
> >
> > Ken H.
> >
> > On Mon, Nov 27, 2017 at 11:58 AM, roy keen

> >
> > > 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.
> > > --
> > _______________________________________________
> > 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
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS

Life is too short to hold a grudge; slash some tires and call it even !
 
Mike,

I've had drain plugs (and temperature sender bungs) in all of my TH425 pans
for many years; it's an aluminum pan (with a plug) that's giving me fits
now..

Ken H.

On Mon, Nov 27, 2017 at 8:48 PM, Kingsley Coach
wrote:

> The next time you have the pan off, weld in a drain plug. Easier and
> cheaper than an aluminum pan !
>
 
Ken,

Try:

https://www.amazon.com/Earls-178003ERL-Stat-Seal-Ring/dp/B0049D7XB8

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] On Behalf Of Ken Henderson
Sent: Monday, November 27, 2017 5:46 PM
To: GMC Mail List
Subject: Re: [GMCnet] Transmission Leak

My leaks continue also. Yesterday I tried George Z.'s suggestion to put
O-rings on the suspect bolts. Before I even got them torqued, the O-rings
could be squeezing out, so I abandoned that -- I wasn't convinced that ATF
was coming out of my all-deadheaded bolt holes.

At the rear of the pan, where all my leakage occurs, the pan gasket was
1/16"-1/8" beyond the pan flange, extending all the way to the vertical
surface where the chain cover seats. In an effort to determine whether the
leaks are coming from the transmission pan or the chain cover, I trimmed
that gasket back to the pan flange. Today I checked the results -- the ATF
is almost certainly coming over the top of the pan gasket -- where I didn't
use any sealant. I'll continue to keep the drip pan below the transmission
until the next ATF change. Then, I'll probably seal both sides of the
gasket -- as much as I hate the thought of having to clean the transmission
flange in the future. With my drain plug and external filter, if that
solves the leak, then in recognition of my age, I'll probably never change
it again -- just hoping I get a chance to seal both sides. :-)

Ken H.

> 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.
> --
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
 
I don't care what people say, the cast Aluminum trans pan with the internal
and external fins do work very well. People have reported noticeable
difference in temperature.
Lso the Final driver cast aluminum cover does work to also keep the trans
cooler as it is connected to the trans.
At one time I felt the final drive aluminum cover was not a functional
item, but several people explained that the final drive can run 300 degrees
so reducing the temperature there does influence trans temp. So take it for
what you feel makes sense.

On Mon, Nov 27, 2017 at 6:36 PM, Rob Mueller
wrote:

> Ken,
>
> Try:
>
> https://www.amazon.com/Earls-178003ERL-Stat-Seal-Ring/dp/B0049D7XB8
>
> 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] On Behalf Of Ken
> Henderson
> Sent: Monday, November 27, 2017 5:46 PM
> To: GMC Mail List
> Subject: Re: [GMCnet] Transmission Leak
>
> My leaks continue also. Yesterday I tried George Z.'s suggestion to put
> O-rings on the suspect bolts. Before I even got them torqued, the O-rings
> could be squeezing out, so I abandoned that -- I wasn't convinced that ATF
> was coming out of my all-deadheaded bolt holes.
>
> At the rear of the pan, where all my leakage occurs, the pan gasket was
> 1/16"-1/8" beyond the pan flange, extending all the way to the vertical
> surface where the chain cover seats. In an effort to determine whether the
> leaks are coming from the transmission pan or the chain cover, I trimmed
> that gasket back to the pan flange. Today I checked the results -- the ATF
> is almost certainly coming over the top of the pan gasket -- where I didn't
> use any sealant. I'll continue to keep the drip pan below the transmission
> until the next ATF change. Then, I'll probably seal both sides of the
> gasket -- as much as I hate the thought of having to clean the transmission
> flange in the future. With my drain plug and external filter, if that
> solves the leak, then in recognition of my age, I'll probably never change
> it again -- just hoping I get a chance to seal both sides. :-)
>
> Ken H.
>

>
> > 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.
> > --
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> 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
http://www.appliedgmc.com
1-800-752-7502
 
Ken,

I just sent you the link as an example of o-ring seals that could be used on bolts and not squeeze out.

IIRC the bolts that hold the trans pan on are 5/16 X 18 so you'd have to select the right size.

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] On Behalf Of Ken Henderson
Sent: Monday, November 27, 2017 10:18 PM
To: GMC Mail List
Subject: Re: [GMCnet] Transmission Leak

I can see how those might work (IF that was my problem). Coupla Q's: Why
3/16"? & Why twice as EXPENSIVE from Amazon as from Summit?

Ken
​H.​

g
 
Seriously, Rob, have you tried them on a Ragusa pan? I haven't been able
to find the correct dimensions for the 5/16" Stat-o-Sea, but, extrapolating
from what I have found, they're probably 0.567" or so in diameter. The
Ragusa doesn't have that much machined area around the bolt holes. l had
to use socket head screws with 0.469" OD heads to even install them. Even
if the seating area was available, I wonder if the fastener's head being
smaller than the washer's OD would be a problem?

Ken H.

On Tue, Nov 28, 2017 at 12:24 AM, Rob Mueller
wrote:

> Ken,
>
> I just sent you the link as an example of o-ring seals that could be used
> on bolts and not squeeze out.
>
> IIRC the bolts that hold the trans pan on are 5/16 X 18 so you'd have to
> select the right size.
>
 
Ken,

Nope, I've never tried these seals on a Ragusa pan.

You mentioned you tried O-rings and they squeezed out; the O-rings in these seals won't squeeze out.

I have no idea if the correct size is available or if they would work on a Ragusa pan.

My intent was to make you aware that they existed.

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] On Behalf Of Ken Henderson
Sent: Tuesday, November 28, 2017 6:47 AM
To: GMC Mail List
Subject: Re: [GMCnet] Transmission Leak

Seriously, Rob, have you tried them on a Ragusa pan? I haven't been able
to find the correct dimensions for the 5/16" Stat-o-Sea, but, extrapolating
from what I have found, they're probably 0.567" or so in diameter. The
Ragusa doesn't have that much machined area around the bolt holes. l had
to use socket head screws with 0.469" OD heads to even install them. Even
if the seating area was available, I wonder if the fastener's head being
smaller than the washer's OD would be a problem?

Ken H.
 
Whoa, whoa, WHOA.

I just re-read this thread to see what you are doing. When I installed my my Manny trans, Manny was standing right there in my hangar. When he saw I
was using a Ragusa trans pan. Hw stopped me and said use NO GASKET. He handed me a tube of some kind of silicone that he liked and said to use it.
I do not remember the brand but I never had a problem with it leaking.

Get rid of the gasket and call Manny for the silicone type.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
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