Home » Public Forums » GMCnet » sealing around back panel
| sealing around back panel [message #118553] |
Sat, 12 March 2011 16:35  |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
Karma: 0
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So now that I've got the inside rear cap off and stripped most of the insulation, I'm seeing clearly where the water is getting in. Looks like it's coming in through the seal around the rear panel - the main back panel that the rear window is mounted in. From the outside I see that in general there's about a 1/4" gap around the panel, and it looks like it's about 1/2" or more deep, and except for one place, looks like there's no sealant in this slot, expecting no doubt that whatever gasket is in the actual seal will be effective. Not wanting to remove the whole back panel and redo the seal/gasket, can I just fill this slot with sealant all the way around the door? I know that will make removing it in the future pretty obnoxious, but short of a complete gutting I can't imagine why I'd need to do that.
Thoughts?
Thanks,
J
76 PB
Portland, OR
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| Re: [GMCnet] sealing around back panel [message #118562 is a reply to message #118553] |
Sat, 12 March 2011 17:10  |
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Put soft rubber vacuum tubing in the slot. It works great!
I think it's 1/4" tubing. Might get a couple sized to experiment with
before committing. You can stretch it a little to make it smaller in
diameter and then it'll expand after you get it in there and it'll
seal even better.
bdub
On Sat, Mar 12, 2011 at 4:35 PM, Jay Rabe <jayrabe@hotmail.com> wrote:
>
>
> So now that I've got the inside rear cap off and stripped most of the insulation, I'm seeing clearly where the water is getting in. Looks like it's coming in through the seal around the rear panel - the main back panel that the rear window is mounted in. From the outside I see that in general there's about a 1/4" gap around the panel, and it looks like it's about 1/2" or more deep, and except for one place, looks like there's no sealant in this slot, expecting no doubt that whatever gasket is in the actual seal will be effective. Not wanting to remove the whole back panel and redo the seal/gasket, can I just fill this slot with sealant all the way around the door? I know that will make removing it in the future pretty obnoxious, but short of a complete gutting I can't imagine why I'd need to do that.
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bdub
bdub.net
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| Re: [GMCnet] sealing around back panel [message #118603 is a reply to message #118553] |
Sat, 12 March 2011 20:49 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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J,
I think it's in one of the old GMCMI newsletters. Use 3/8"
surgical tubing, available at your local drugstore. Start at the
bottom center. have someone hold the end and stretch the tubing
and push it into the crack. Work your way around to
the starting point. The stuff will seal the crack effectively as
it attempts to swell back to size. Sorry, I can't recall the
length needed. HTH
Gary Kosier
77EII & 77PB
Newark, Ohio
----- Original Message -----
From: "Jay Rabe" <jayrabe@hotmail.com>
To: <gmclist@temp.gmcnet.org>
Sent: Saturday, March 12, 2011 5:35 PM
Subject: [GMCnet] sealing around back panel
>
>
> So now that I've got the inside rear cap off and stripped most
> of the insulation, I'm seeing clearly where the water is
> getting in. Looks like it's coming in through the seal around
> the rear panel - the main back panel that the rear window is
> mounted in. From the outside I see that in general there's
> about a 1/4" gap around the panel, and it looks like it's about
> 1/2" or more deep, and except for one place, looks like there's
> no sealant in this slot, expecting no doubt that whatever
> gasket is in the actual seal will be effective. Not wanting to
> remove the whole back panel and redo the seal/gasket, can I
> just fill this slot with sealant all the way around the door? I
> know that will make removing it in the future pretty obnoxious,
> but short of a complete gutting I can't imagine why I'd need to
> do that.
>
> Thoughts?
>
> Thanks,
>
> J
> 76 PB
> Portland, OR
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: sealing around back panel [message #118606 is a reply to message #118553] |
Sat, 12 March 2011 21:49 |
idrob
Messages: 645
Registered: January 2005
Location: Central Idaho
Karma: 0
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| jayrabe wrote on Sat, 12 March 2011 14:35 |
So now that I've got the inside rear cap off and stripped most of the insulation, I'm seeing clearly where the water is getting in. Looks like it's coming in through the seal around the rear panel - the main back panel that the rear window is mounted in. From the outside I see that in general there's about a 1/4" gap around the panel, and it looks like it's about 1/2" or more deep, and except for one place, looks like there's no sealant in this slot, expecting no doubt that whatever gasket is in the actual seal will be effective. Not wanting to remove the whole back panel and redo the seal/gasket, can I just fill this slot with sealant all the way around the door? I know that will make removing it in the future pretty obnoxious, but short of a complete gutting I can't imagine why I'd need to do that.
Thoughts?
Thanks,
J
76 PB
Portland, OR
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As others have said, put vacuum tubing in the gap. Here is a photo of what it looks like, and the next one in the series has another view.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=17296&cat=4491
Rob Allen
former owner of '76 x-PB
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| Re: [GMCnet] sealing around back panel [message #118607 is a reply to message #118553] |
Sat, 12 March 2011 22:05 |
jw mills
Messages: 199
Registered: September 2006
Karma: -30
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Senior Member |
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I used backer rod from Home Depot. That is the foam dowel that is used
to put in cracks in cement to that it doesn't take so much grout (or
what ever) to fill. It has worked fine for 3 years now.
--
Jim Mills
Greeley, CO
1973 CanyonLands 260 TZE-063V100731(under renovation)
1973 Glacier 230 TZE-033V101993
KD0NPU
On Sat, 2011-03-12 at 16:35 -0600, Jay Rabe wrote:
>
> So now that I've got the inside rear cap off and stripped most of the insulation, I'm seeing clearly where the water is getting in. Looks like it's coming in through the seal around the rear panel - the main back panel that the rear window is mounted in. From the outside I see that in general there's about a 1/4" gap around the panel, and it looks like it's about 1/2" or more deep, and except for one place, looks like there's no sealant in this slot, expecting no doubt that whatever gasket is in the actual seal will be effective. Not wanting to remove the whole back panel and redo the seal/gasket, can I just fill this slot with sealant all the way around the door? I know that will make removing it in the future pretty obnoxious, but short of a complete gutting I can't imagine why I'd need to do that.
>
> Thoughts?
>
> Thanks,
>
> J
> 76 PB
> Portland, OR
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Removing (was sealing around ) back panel [message #118630 is a reply to message #118624] |
Sun, 13 March 2011 05:41 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| KRDietz wrote on Sat, 12 March 2011 23:07 |
This thread got me thinking - so I hijacked it.
What are the chances of getting the back panel OFF of the GMC? Hoping
to paint sometime this Winter and I'd like to replace the screws holding
it in. I'd also like to just pull the whole thing off and make sure it
seals up nicely. ....
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I understand there is a difference between the early and late coaches.
Dan Winchester has done it on his early 23 foot:
<http://gmc.dwinchester.com/GMC_230_Back_Hatch/GMC_230_Back_Hatch_Screw_Replacement.html>
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Removing (was sealing around ) back panel [message #118637 is a reply to message #118624] |
Sun, 13 March 2011 08:16 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Kelvin,
The OEM screws are 3/8" OD and they screw through the rear panel and
directly into the SMC rear cap. Jim B sells a kit that includes Stainless
Steel screws (they've got a wide head and 10/32 threads, I think) and
special inserts. When I was down at the COOP this past summer I replaced the
rusted screws with that kit.
I asked for an air impact driver and EVERYBODY told me that you CAN'T get
them out with an impact driver! You'll strip the Philips; we've tried it a
bunch of times!
I insisted and they gave me a 3/8" drive pistol grip impact driver. I got a
3/8" Philips bit that REALLY tight fit.
I started with one of the screws that was at chest height so I could put all
my upper body weight on the impact driver before I pulled the trigger.
I gently pulled the trigger on the impact driver and slowly increased the
hammer repetitions until the screw came out.
I repeated my actions and got every one of them out except one; I pulled the
trigger too hard before I had my weight on the impact driver and the
Phillips stripped. I drilled that screw out and used an easy out.
The key is keeping the force of the hammering below the point that the
Philips strips yet high enough to loosen the screws. It does take a fair few
blows of the impact to loosen them.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of KRDietz
Sent: Sunday, March 13, 2011 6:08 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Removing (was sealing around ) back panel
This thread got me thinking - so I hijacked it.
What are the chances of getting the back panel OFF of the GMC? Hoping
to paint sometime this Winter and I'd like to replace the screws holding
it in. I'd also like to just pull the whole thing off and make sure it
seals up nicely. I do have rubber tubing in there now.
Anyway. The screws are tight but they CAN be drilled out. Or maybe an
impact driver.
I assume they screw into threaded inserts in the end cap?
What are the chances those inserts will stay in place if I bang on a
screw to remove it?
Food for future thought.
TIA,
Kelvin
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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: [GMCnet] Removing (was sealing around ) back panel [message #118650 is a reply to message #118642] |
Sun, 13 March 2011 11:07 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| Robert Mueller wrote on Sun, 13 March 2011 07:06 |
Mike,
The screws in my 1975 Avion (November 1974 Transmode) DO NOT look like the
ones Dan Winchester removed. ...
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Yes, Rob.
I know the fasteners changed at some point. Looks like it was at or before the 1975 model year change.
But, Kelvin has an early coach most likely earlier than the one Dan was working on. I understand those fasteners are a "bear" to remove... but haven't done it myself.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] Removing (was sealing around ) back panel [message #118681 is a reply to message #118650] |
Sun, 13 March 2011 14:19 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| mike miller wrote on Sun, 13 March 2011 11:07 |
[I know the fasteners changed at some point. Looks like it was at or before the 1975 model year change.
But, Kelvin has an early coach most likely earlier than the one Dan was working on. I understand those fasteners are a "bear" to remove... but haven't done it myself.
|
I bought JimB's screw kit. Somewhat later I was able to get some parts off a 73 that was being cut up. One bit I got was a piece of the panel with the rear panel seam and several screws. I got that just to see how difficult it would be to get the screws out. I've determined it ain't gonna happen. I gave up on the idea of replacing the screws. IMO the heads will have to be drilled off to get the panel out and then the shanks and the inserts could be removed. The screws are so corroded into the inserts they will not come out, at least not without significant panel damage. YMMV if your GMC has never seen anything but the dry southwest.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] sealing around back panel [message #119134 is a reply to message #118610] |
Thu, 17 March 2011 21:22 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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After having all the paint crack over the pliable PL Polyurethane sealant I
put in the groove, I can't recommend it. Use the tubing & don't paint it.
Ken H.
On Sat, Mar 12, 2011 at 11:22 PM, Larry <weidnerl@wwt.net> wrote:
>
>
> Honestly now, what are the chances that you are ever going to want to take
> that door out? Mine leaked along the top. I used Vulcan 116 sealant.
> Available at Fastenal stores around the country in a multitude of colors.
> My brother a contractor, uses this stuff exclusively on his siding jobs. I
> put it on my home and in Wisconsin weather it is still pliable 9yrs after
> application. It sealed up the leak around my coach rear door and is
> paintable. JWID
> --
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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