| Gasket installation [message #68501] |
Sun, 27 December 2009 14:54  |
bernie
Messages: 46
Registered: February 2008
Location: Montreal
Karma: 0
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I am changing my thermostat gasket. What do you suggest?
1) Use only gasket
or
2) Use gasket and RTV ?
What about the other gaskets ? With or without RTV?
Bernard
GMC Transmode 1977
Montreal,Canada
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| Re: [GMCnet] Gasket installation [message #68504 is a reply to message #68501] |
Sun, 27 December 2009 15:01  |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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When I asked --- Matt Colie posted this most thorough reply..
QUOTE...
OK Dennis,
It’s back to my old life as the aftermarket gasket guy for McCord. . . .
Aftermarket gaskets can come to you in many different conditions.
Some may have a PSA on one side and a coating on the other (PSA = pressure
sensitive adhesive)
Some may have either a teflon (generic) or a silicon rubber coating.
Some are dry calender (paper).
Install the top two the way they came. The coatings may be very thin and not
easily recognized. If it does not feel like dry paper, it probably is not.
As to a dry paper gasket.
Try to avoid adhesive on both sides. This will make the gasket tear with
thermal movement.
Glue on one side and grease on the other is always good because then parts can
slide without any damage.
Grease should only be on one side as the assembly may be counting on some
friction to hold the gasket in place. Do not count on the roughness of the
finished surface to do this. If the gasket crawls out, glue the replacement to
the side that is most easily removed for scraping.
If you glue and grease a coated gasket? No harm done.
If you don’t do anything to a dry paper gasket, most will work just fine.
If you have a joint that leaks no matter what you do - try a different supplier
for starters.
Most components and sealing systems were designed to work with the original
fastener tension (bolt torque). Do not exceed that just because it is leaking.
Many gasket materials creep, so if leakage is noted check the fastener tension.
If it is less than specified, returning it to proper tension can do no harm.
I hope I answered you question effectively. I’m going to know more in a
very short time, my coach’s thermostat is hung open. (I’ll be
calling JimK about that and a pair of windshields - thanks truck... on Monday.
Matt
--
Matt & Mary Colie
'73 Glacier 23 Chaumiere (say show-me-air)
SE Michigan
_____________
END QUOTE...
Dennis Sexton
73 GMC
Germantown, TN
USA
-----Original Message-----
From: Bernard <danxavfan@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Sun, Dec 27, 2009 2:54 pm
Subject: [GMCnet] Gasket installation
I am changing my thermostat gasket. What do you suggest?
1) Use only gasket
or
2) Use gasket and RTV ?
What about the other gaskets ? With or without RTV?
--
ernard
MC Transmode 1977
ontreal,Canada
______________________________________________
MCnet mailing list
ist Information and Subscription Options:
ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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List Information and Subscription Options:
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Gasket installation [message #68532 is a reply to message #68504] |
Sun, 27 December 2009 17:57 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Good tip Matt. It is always a good day when I learn something.
On Sun, Dec 27, 2009 at 2:01 PM, <dennisfsexton@aol.com> wrote:
>
> When I asked --- Matt Colie posted this most thorough reply..
>
> QUOTE...
>
> OK Dennis,
>
> It’s back to my old life as the aftermarket gasket guy for McCord. . . .
>
> Aftermarket gaskets can come to you in many different conditions.
> Some may have a PSA on one side and a coating on the other (PSA = pressure
> sensitive adhesive)
> Some may have either a teflon (generic) or a silicon rubber coating.
> Some are dry calender (paper).
> Install the top two the way they came. The coatings may be very thin and not
> easily recognized. If it does not feel like dry paper, it probably is not.
>
> As to a dry paper gasket.
> Try to avoid adhesive on both sides. This will make the gasket tear with
> thermal movement.
> Glue on one side and grease on the other is always good because then parts can
> slide without any damage.
> Grease should only be on one side as the assembly may be counting on some
> friction to hold the gasket in place. Do not count on the roughness of the
> finished surface to do this. If the gasket crawls out, glue the replacement to
> the side that is most easily removed for scraping.
>
> If you glue and grease a coated gasket? No harm done.
> If you don’t do anything to a dry paper gasket, most will work just fine.
>
> If you have a joint that leaks no matter what you do - try a different supplier
> for starters.
>
> Most components and sealing systems were designed to work with the original
> fastener tension (bolt torque). Do not exceed that just because it is leaking.
> Many gasket materials creep, so if leakage is noted check the fastener tension.
> If it is less than specified, returning it to proper tension can do no harm.
>
> I hope I answered you question effectively. I’m going to know more in a
> very short time, my coach’s thermostat is hung open. (I’ll be
> calling JimK about that and a pair of windshields - thanks truck... on Monday.
>
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumiere (say show-me-air)
> SE Michigan
> _____________
>
> END QUOTE...
>
> Dennis Sexton
> 73 GMC
> Germantown, TN
> USA
>
>
>
> -----Original Message-----
> From: Bernard <danxavfan@gmail.com>
> To: gmclist@temp.gmcnet.org
> Sent: Sun, Dec 27, 2009 2:54 pm
> Subject: [GMCnet] Gasket installation
>
>
>
> I am changing my thermostat gasket. What do you suggest?
> 1) Use only gasket
> or
> 2) Use gasket and RTV ?
> What about the other gaskets ? With or without RTV?
> --
> ernard
> MC Transmode 1977
> ontreal,Canada
> ______________________________________________
> MCnet mailing list
> ist Information and Subscription Options:
> ttp://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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