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| [GMCnet] Pressure testing rad [message #267243] |
Sat, 06 December 2014 17:08  |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Senior Member |
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Netters
I have a replacement radiator for my GMC. Before I install it I'd like to
take it up the road and have it pressure tested.
What instructions should I give? At what pressure should it be tested ?
Thanks
Mike in NS
--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
I am not an alcoholic; alcoholics go to meetings.
I am a drunk; I go to parties !
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| Re: [GMCnet] Pressure testing rad [message #267253 is a reply to message #267252] |
Sat, 06 December 2014 20:33  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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G'day,
I scanned MM X-7525, X7625 & X-7725 and none of them provide a test pressure so I go with Bdub's recommendation but no more than 12
psi.
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Billy Massey
Sent: Sunday, December 07, 2014 1:23 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Pressure testing rad
Original rad uses a 9# cap. Reckon I'd use that as a guide.
bdub
-----Original Message-----
From: Gmclist On Behalf Of Kingsley Coach
Sent: Saturday, December 06, 2014 5:09 PM
I have a replacement radiator for my GMC. Before I install it I'd like to
take it up the road and have it pressure tested.
What instructions should I give? At what pressure should it be tested?
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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] Pressure testing rad [message #267257 is a reply to message #267253] |
Sat, 06 December 2014 21:44 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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I beg to differ. If I'm going to run 9 psi, I'm gonna test to at least 18
psi. I want any weakness to be found before I'm in the middle of a desert
somewhere. IIRC, Griffin tests their aluminum ones, for 15 psi normal
operation, at 30+ psi.
Ken H.
On Sat, Dec 6, 2014 at 9:33 PM, Rob Mueller wrote:
> G'day,
>
> I scanned MM X-7525, X7625 & X-7725 and none of them provide a test
> pressure so I go with Bdub's recommendation but no more than 12
> psi.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> USA '75 Avion - Double Trouble TZE365V100426
> AUS '75 Avion - The Blue Streak TZE365V100428
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Billy
> Massey
> Sent: Sunday, December 07, 2014 1:23 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Pressure testing rad
>
> Original rad uses a 9# cap. Reckon I'd use that as a guide.
>
> bdub
>
>
> -----Original Message-----
> From: Gmclist On Behalf Of Kingsley Coach
> Sent: Saturday, December 06, 2014 5:09 PM
>
> I have a replacement radiator for my GMC. Before I install it I'd like to
> take it up the road and have it pressure tested.
>
> What instructions should I give? At what pressure should it be tested?
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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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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| Re: [GMCnet] Pressure testing rad [message #267258 is a reply to message #267257] |
Sat, 06 December 2014 21:54 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Yes. It's Christmas time in the Pacific Northwest. I was being a smartass.
Test to twice normal operating pressure. 18 psi. In this example.
Jim Hupy
On Dec 6, 2014 7:44 PM, "Ken Henderson" wrote:
> I beg to differ. If I'm going to run 9 psi, I'm gonna test to at least 18
> psi. I want any weakness to be found before I'm in the middle of a desert
> somewhere. IIRC, Griffin tests their aluminum ones, for 15 psi normal
> operation, at 30+ psi.
>
> Ken H.
>
>
> On Sat, Dec 6, 2014 at 9:33 PM, Rob Mueller
> wrote:
>
>> G'day,
>>
>> I scanned MM X-7525, X7625 & X-7725 and none of them provide a test
>> pressure so I go with Bdub's recommendation but no more than 12
>> psi.
>>
>> Regards,
>> Rob M.
>> The Pedantic Mechanic
>> USAussie - Downunder
>> USA '75 Avion - Double Trouble TZE365V100426
>> AUS '75 Avion - The Blue Streak TZE365V100428
>>
>>
>> -----Original Message-----
>> From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of
> Billy
>> Massey
>> Sent: Sunday, December 07, 2014 1:23 PM
>> To: gmclist@temp.gmcnet.org
>> Subject: Re: [GMCnet] Pressure testing rad
>>
>> Original rad uses a 9# cap. Reckon I'd use that as a guide.
>>
>> bdub
>>
>>
>> -----Original Message-----
>> From: Gmclist On Behalf Of Kingsley Coach
>> Sent: Saturday, December 06, 2014 5:09 PM
>>
>> I have a replacement radiator for my GMC. Before I install it I'd like to
>> take it up the road and have it pressure tested.
>>
>> What instructions should I give? At what pressure should it be tested?
>>
>>
>>
>> _______________________________________________
>> 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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>
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| Re: [GMCnet] Pressure testing rad [message #267259 is a reply to message #267257] |
Sat, 06 December 2014 22:08 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Senior Member |
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The info on my Griffin radiator said it was tested at 36 PSI. I've been
using a 16 PSI cap for 7+ years with no problems whatsoever.
Gary Kosier
77 PB w/Cad 500
Newark, Oh
-----Original Message-----
From: Ken Henderson
Sent: Saturday, December 06, 2014 10:44 PM
To: gmclist
Subject: Re: [GMCnet] Pressure testing rad
I beg to differ. If I'm going to run 9 psi, I'm gonna test to at least 18
psi. I want any weakness to be found before I'm in the middle of a desert
somewhere. IIRC, Griffin tests their aluminum ones, for 15 psi normal
operation, at 30+ psi.
Ken H.
On Sat, Dec 6, 2014 at 9:33 PM, Rob Mueller wrote:
> G'day,
>
> I scanned MM X-7525, X7625 & X-7725 and none of them provide a test
> pressure so I go with Bdub's recommendation but no more than 12
> psi.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> USAussie - Downunder
> USA '75 Avion - Double Trouble TZE365V100426
> AUS '75 Avion - The Blue Streak TZE365V100428
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Billy
> Massey
> Sent: Sunday, December 07, 2014 1:23 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] Pressure testing rad
>
> Original rad uses a 9# cap. Reckon I'd use that as a guide.
>
> bdub
>
>
> -----Original Message-----
> From: Gmclist On Behalf Of Kingsley Coach
> Sent: Saturday, December 06, 2014 5:09 PM
>
> I have a replacement radiator for my GMC. Before I install it I'd like to
> take it up the road and have it pressure tested.
>
> What instructions should I give? At what pressure should it be tested?
>
>
>
> _______________________________________________
> 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] Pressure testing rad [message #267260 is a reply to message #267258] |
Sat, 06 December 2014 22:20 |
gbarrow2
Messages: 765
Registered: February 2004
Location: Lake Almanor, Ca./ Red Bl...
Karma: 3
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Senior Member |
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Jim,
Are you sampling the egg nog? You're heater core message went to the wrong thread; so this one is a non-sequitur. But, your point is spot on. Merry Christmas.
Gene Barrow
Lake Almanor, Ca.
1976 Palm Beach
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| Re: [GMCnet] Pressure testing rad [message #267262 is a reply to message #267257] |
Sun, 07 December 2014 01:29 |
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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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Ken,
And I beg to differ too! ;-) Here's my logic.
Remember when I "broke" my OEM radiator a few blocks from your home and you noted it was spewing fluid as I pulled onto your rack?
When we got it out we noted how thin the tubes were after 30 plus years. I felt that the radiator cap pressure range of 9 psi would
not shift upwards over the life of the cap. I felt that the failure mode would be to "go nuts" and REALLY over pressurize the
cooling system. Testing the radiator to 12 psi would cause any thin tubes to fail but not cause a radiator that was serviceable to
fail.
Also hasn't it been stated here that the heater core doesn't like more than 14 psi? If that's true I'll go up to 14 psi.
Here's a link to some info posted by Stant:
http://installer.aed-inc.com:8191/Stant%20Technical%20Info/TempTalkRadCap_4.htm
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Ken Henderson
I beg to differ. If I'm going to run 9 psi, I'm gonna test to at least 18 psi. I want any weakness to be found before I'm in the
middle of a desert somewhere. IIRC, Griffin tests their aluminum ones, for 15 psi normal operation, at 30+ psi.
Ken H.
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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] Pressure testing rad [message #267266 is a reply to message #267262] |
Sun, 07 December 2014 06:46 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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USAussie wrote on Sun, 07 December 2014 00:29Ken,
And I beg to differ too!  Here's my logic.
Remember when I "broke" my OEM radiator a few blocks from your home and you noted it was spewing fluid as I pulled onto your rack?
When we got it out we noted how thin the tubes were after 30 plus years. I felt that the radiator cap pressure range of 9 psi would
not shift upwards over the life of the cap. I felt that the failure mode would be to "go nuts" and REALLY over pressurize the
cooling system. Testing the radiator to 12 psi would cause any thin tubes to fail but not cause a radiator that was serviceable to
fail.
Also hasn't it been stated here that the heater core doesn't like more than 14 psi? If that's true I'll go up to 14 psi.
Here's a link to some info posted by Stant:
http://installer.aed-inc.com:8191/Stant%20Technical%20Info/TempTalkRadCap_4.htm
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Ken Henderson
I beg to differ. If I'm going to run 9 psi, I'm gonna test to at least 18 psi. I want any weakness to be found before I'm in the
middle of a desert somewhere. IIRC, Griffin tests their aluminum ones, for 15 psi normal operation, at 30+ psi.
Ken H.
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Interesting view points. It is normal to test to twice the rated capacity of components whether it be radiators or tow straps, but I'm not sure that is what this is all about. These are not new components as a system so personally I would go half way in between. A new radiator may be able to perform at twice the rated pressure, but how about the water heater, hoses, heater core, etc. If I was going on an extended cross country trip, I would want some safety factor, but not really a new system design validation.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Pressure testing rad [message #267330 is a reply to message #267291] |
Mon, 08 December 2014 11:55 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Mike, it was Jack Daniels on the rocks while working full speed ahead
cooking pork tenderloins for the rally, as well as steaming cauliflower and
broccoli florets. I had a few seconds to respond, but my big fingertips
punched the wrong line on gmail. Off it went to the wrong thread. Stuff
happens. You have a standing offer of shares anytime you are near to us.
Jim Hupy & Judy
Salem, Or.
On Dec 7, 2014 1:14 PM, "Kingsley Coach" wrote:
> Billy
>
> There isn't a so called 'Professional' out there that has half the
> knowledge of the guys on here. The replacement came from my 'parts' GMC
> which was previously owned by Jim Rosenburg (Dyno Sources).
>
> I think I'll just ask what pressure he tests at before I show up .. I'll
> keep you informed...
>
> Thanks to everyone for their opinion but I would ask Jim Hupy to SHARE
> before typing comments !
>
> Mike in NS
>
>
>
> On Sun, Dec 7, 2014 at 11:58 AM, Billy Massey wrote:
>
>> Let us know how the test turns out on the "radiator only", Mike. I'm
> sure
>> your professional will know at what pressure limits to use.
>> Where did you come up with the replacement? Is it new?
>> Good luck
>> bdub
>> On Dec 6, 2014 5:34 PM, "Kingsley Coach" wrote:
>>
>>> Netters
>>>
>>> I have a replacement radiator for my GMC. Before I install it I'd like
> to
>>> take it up the road and have it pressure tested.
>>>
>>> What instructions should I give? At what pressure should it be tested
> ?
>>>
>>> Thanks
>>>
>>> Mike in NS
>>>
>>> --
>>> Michael Beaton
>>> 1977 Kingsley 26-11
>>> 1977 Eleganza II 26-3
>>> Antigonish, NS
>>>
>>> I am not an alcoholic; alcoholics go to meetings.
>>> I am a drunk; I go to parties !
>>> _______________________________________________
>>> 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
>>
>
>
>
> --
> Michael Beaton
> 1977 Kingsley 26-11
> 1977 Eleganza II 26-3
> Antigonish, NS
>
> I am not an alcoholic; alcoholics go to meetings.
> I am a drunk; I go to parties !
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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