Home » Public Forums » GMCnet » Transmission gasket recommendations
| Transmission gasket recommendations [message #204798] |
Tue, 16 April 2013 10:08  |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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After changing to the Rockwell pan, and using the "best" gasket available, according to local transmission guy. It still leaks.
What is the consensus of best practices and gasket for the seam between the pan and the transmission body?
Need to change this before Bean Station, or I'll dribble down the highway.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Transmission gasket recommendations [message #204800 is a reply to message #204798] |
Tue, 16 April 2013 10:28  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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If you still have the original oil pan on the transmission, the problem is
possibly not the gasket, but the flange where the mounting bolts are. That
flange frequently is distorted due to overtightening the bolts. You need to
place a Straightedge on the mating face to verify the flatness. If it is
not flat, take a piece of very hard wood or aluminum bar stock that can fit
between the lip and flange, and a good body hammer with a FLAT profile.
Hold the wood piece in a sturdy vice, place the pan flat, and TAP, not
beat the heck out of, the area of the bolt holes. Recheck with a
Straightedge and do not stretch the metal out. Just get it flat and then
stop hammering. Use a high tack gasket compound on the pan and gasket,
clean the crap out of the transmission case with brake kleen or carb
cleaner, and put it together. Do not tighten the bolts more than 12 foot
pounds torque initially. If you follow these instructions, it should not
leak again. Jwid.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Apr 16, 2013 8:08 AM, "Thomas Phipps" <tph1pp5@yahoo.com> wrote:
>
>
> After changing to the Rockwell pan, and using the "best" gasket available,
> according to local transmission guy. It still leaks.
> What is the consensus of best practices and gasket for the seam between
> the pan and the transmission body?
> Need to change this before Bean Station, or I'll dribble down the highway.
> Tom, MS II
> --
> 1975 GMC Avion, under forever re-construction
> Vicksburg, MS. 3.7 miles from I-20
> _______________________________________________
> GMCnet mailing list
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> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Transmission gasket recommendations [message #204805 is a reply to message #204800] |
Tue, 16 April 2013 11:01 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Thanks, but this is a brand new Rockwell pan. I suspect that the pan is perfectly flat, unless it warped in less than a 400 mile
run. It was torqued carefully and the torquing was done in stages spaced around the pan.
Tom
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Transmission gasket recommendations [message #204806 is a reply to message #204800] |
Tue, 16 April 2013 11:00 |
Jp Benson
Messages: 649
Registered: October 2011
Location: Fla
Karma: 2
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Tom,
The back of some Rockwell pans butts into the transmission back cover
before the gasket seats. Seeping occurs across the back of the pan.
Check with a feeler gage to see. If that's your situation, then the
back of the pan can be worked on. I'm planning to do that on mine
shortly and assuming this is going to fix it. Gasket sealer or a
thicker gasket might also solve the problem.
I like the drain plug, extra quart capacity and combination internal/external heat exchange fins on the Rockwell pan. Unlike the steel pans that Jim mentions, the Rockwell pan has a large uniformly flat mating surface. I think that any properly installed gasket should work once the pan fits.
JP
>________________________________
> From: James Hupy <jamesh1296@gmail.com>
>To: gmclist@temp.gmcnet.org
>Sent: Tuesday, April 16, 2013 11:28 AM
>Subject: Re: [GMCnet] Transmission gasket recommendations
>
>
>If you still have the original oil pan on the transmission, the problem is
>possibly not the gasket, but the flange where the mounting bolts are. That
>flange frequently is distorted due to overtightening the bolts. You need to
>place a Straightedge on the mating face to verify the flatness. If it is
>not flat, take a piece of very hard wood or aluminum bar stock that can fit
>between the lip and flange, and a good body hammer with a FLAT profile.
>Hold the wood piece in a sturdy vice, place the pan flat, and TAP, not
>beat the heck out of, the area of the bolt holes. Recheck with a
>Straightedge and do not stretch the metal out. Just get it flat and then
>stop hammering. Use a high tack gasket compound on the pan and gasket,
>clean the crap out of the transmission case with brake kleen or carb
>cleaner, and put it together. Do not tighten the bolts more than 12 foot
>pounds torque initially. If you follow these instructions, it should not
>leak again. Jwid.
>Jim Hupy
>Salem, Or
>78 Gmc Royale 403
>On Apr 16, 2013 8:08 AM, "Thomas Phipps" <tph1pp5@yahoo.com> wrote:
>
>>
>>
>> After changing to the Rockwell pan, and using the "best" gasket available,
>> according to local transmission guy. It still leaks.
>> What is the consensus of best practices and gasket for the seam between
>> the pan and the transmission body?
>> Need to change this before Bean Station, or I'll dribble down the highway.
>> Tom, MS II
>> --
>> 1975 GMC Avion, under forever re-construction
>> Vicksburg, MS. 3.7 miles from I-20
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>_______________________________________________
>GMCnet mailing list
>Unsubscribe or Change List Options:
>http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Transmission gasket recommendations [message #204807 is a reply to message #204805] |
Tue, 16 April 2013 11:19 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Well, Duhh. I did not even see that you had a Rockwell pan. My instructions
still stand for the stamped sheet metal pans, and do not apply to the cast
aluminum ones. I have noticed on the cast pans that there is not much
clearance on the chaincase side of the pan. A little relief grinding might
be in order there to provide more clearance. Another case of not reading
before I answer.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Tue, Apr 16, 2013 at 9:01 AM, Thomas Phipps <tph1pp5@yahoo.com> wrote:
>
>
> Thanks, but this is a brand new Rockwell pan. I suspect that the pan is
> perfectly flat, unless it warped in less than a 400 mile
> run. It was torqued carefully and the torquing was done in stages spaced
> around the pan.
> Tom
> --
> 1975 GMC Avion, under forever re-construction
> Vicksburg, MS. 3.7 miles from I-20
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] Transmission gasket recommendations [message #204823 is a reply to message #204807] |
Tue, 16 April 2013 13:59 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Jim, No harm , No foul. Others might have the same question and have the original pan. I 'll crawl under and check for the rear interference. Now to go look for a thicker gasket.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Transmission gasket recommendations [message #204961 is a reply to message #204919] |
Wed, 17 April 2013 14:24 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Closer examination of the Trans pan shows seepage along the back edge. I need to move coach to facilitate removing the pan and carefully trimming the back edge.
I'll re-install with Manny's suggested gasket sealer. The Trans shop that I got the gasket from indicated no sealer needed. He may be correct if the pan had totally seated against the Trans body.
I think that I will wear suspenders with my belt on this one, and use sealer.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: Transmission gasket recommendations [message #205088 is a reply to message #204798] |
Thu, 18 April 2013 11:30 |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
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Senior Member |
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In the years I was riden british motorcycles it was standart procedure to assemble all oil closures with gaskets and liquide gasket on both sides. The trick was the to let the liquide gasket settle for a 24 hours before adding the oil.
That made an end to the " always leaking british bikes"
Might work on the gmc as well ?
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
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| Re: [GMCnet] Transmission gasket recommendations [message #205093 is a reply to message #205088] |
Thu, 18 April 2013 11:50 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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We did Lycoming, Continental, and V flat motors with a thin coat of Permatex to tack a very fine silk thread all the way around the sealing lip. They never leaked. No gasket at all.
My '68 Victor Special leaked always - SAE30, SAE 40 or 50, and SAE90. It was still a lovely bike tho'.
--johnny
'76 23' transmode norris
'76 palm beach
________________________________
From: lenze middelberg <lenze@middelberg.dk>
To: gmclist@temp.gmcnet.org
Sent: Thursday, April 18, 2013 12:30 PM
Subject: Re: [GMCnet] Transmission gasket recommendations
In the years I was riden british motorcycles it was standart procedure to assemble all oil closures with gaskets and liquide gasket on both sides. The trick was the to let the liquide gasket settle for a 24 hours before adding the oil.
That made an end to the " always leaking british bikes"
Might work on the gmc as well ?
_______________________________________________
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Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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