| OEM oil and trans coolers [message #361808] |
Sat, 16 January 2021 15:43  |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
Karma: 0
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Senior Member |
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Somewhere, I saw online some pictures of the OEM coolers that had been taken out of a TZE radiator. I've been looking on the photo site, but didn't see it.
Does anyone remember seeing these somewhere?
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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| Re: [GMCnet] OEM oil and trans coolers [message #361839 is a reply to message #361836] |
Tue, 19 January 2021 07:58  |
Michael Hunt
Messages: 6
Registered: April 2019
Karma: 0
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Junior Member |
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Why not add stand alone, after market units. I'm not fortunate enough to
own one of these iconic coaches, however I have an Astro van and have
upgraded the entire cooling system as follows;
3core all aluminum radiator with an FRS extra heavy duty electric fan kit.
Hayden #1679 extra heavy duty transmission boil cooler, and my latest
addition, a 15 row engine oil cooler. If I ever save enough money to own my
own GMC I will do similar modifications.
On Tue, Jan 19, 2021, 8:20 AM Robert Mueller via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Greg,
>
> Here you go:
>
>
> http://www.gmcmhphotos.com/photos/g6805-oem-engine-26amp-3b-trans-oil-coolers.html
>
> --
> Regards,
> Rob M. (USAussie)
> The Pedantic Mechanic
> Sydney, Australia
> '75 Avion - AUS - The Blue Streak TZE365V100428
> '75 Avion - USA - Double Trouble TZE365V100426
>
> _______________________________________________
> GMCnet mailing list
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| Re: OEM oil and trans coolers [message #361847 is a reply to message #361836] |
Tue, 19 January 2021 11:19 |
uprooted
Messages: 72
Registered: December 2019
Location: Hilliard, OH
Karma: 0
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Holy crap! These photos support the theory that you should bypass these OEM coolers after an engine failure! Talk about harboring rogue particles!
Corey P /
Hilliard, OH /
1974 Glacier 26' /
3.70 FD /
ION Wheels
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| Re: [GMCnet] OEM oil and trans coolers [message #361849 is a reply to message #361847] |
Tue, 19 January 2021 11:49 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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My exact thoughts Corey Sent from my U.S.Cellular© Smartphone
-------- Original message --------From: Corey via Gmclist Date: 1/19/21 11:20 AM (GMT-06:00) To: gmclist@list.gmcnet.org Cc: Corey Subject: Re: [GMCnet] OEM oil and trans coolers Holy crap! These photos support the theory that you should bypass these OEM coolers after an engine failure! Talk about harboring rogue particles!-- Corey P / Hilliard, OH / 1974 Glacier 26' / 3.70 FD / ION Wheels_______________________________________________GMCnet mailing listUnsubscribe or Change List Options:http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] OEM oil and trans coolers [message #361853 is a reply to message #361850] |
Tue, 19 January 2021 13:51 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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I sure never, never, trust an oil cooler to use again after an engine
failure. It's kinda like Tupperware containers of leftovers in the
refrigerator. "If in doubt, throw it out.!"
Jim Hupy
Salem, Oregon
On Tue, Jan 19, 2021, 10:36 AM Larry via Gmclist
wrote:
> uprooted wrote on Tue, 19 January 2021 11:19
>> Holy crap! These photos support the theory that you should bypass these
> OEM coolers after an engine failure! Talk about harboring rogue particles!
>
> Or, when you have an engine failure, if your radiator is copper, have the
> end cap desoldered and a new cooler installed.
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
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| Re: [GMCnet] OEM oil and trans coolers [message #361861 is a reply to message #361839] |
Tue, 19 January 2021 21:10 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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That was my thought too.
Ken B.
Michael Hunt wrote on Tue, 19 January 2021 07:58Why not add stand alone, after market units. I'm not fortunate enough to
own one of these iconic coaches, however I have an Astro van and have
upgraded the entire cooling system as follows;
3core all aluminum radiator with an FRS extra heavy duty electric fan kit.
Hayden #1679 extra heavy duty transmission boil cooler, and my latest
addition, a 15 row engine oil cooler. If I ever save enough money to own my
own GMC I will do similar modifications.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] OEM oil and trans coolers [message #361862 is a reply to message #361857] |
Tue, 19 January 2021 21:33 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Just my thoughts on external “coolers”, the OEM coolers do a lot more than just cool the oils. They also heat the oil when cold to get engine bearings and transmission moving parts to operating temps long before they would if you had an external only. “Cooler”. The OEM coolers in the radiators also control operating temp to stay in optimum working temperature for maximum longevity. In my thoughts Running an engine oil or transmission oil to cold is as bad as running to hot. If you have ever started a diesel in dead cold of winter without an engine heater you can understand where Im coming from. I also have had good results with our local big truck radiator shop cleaning coolers that were contaminated. They have a reversible hot flush machine.
USAussie wrote on Tue, 19 January 2021 18:03I would trust it if it was flushed with:
http://www.hotflusher.com/automotive/hotflush-machine.cfm
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] OEM oil and trans coolers [message #361864 is a reply to message #361862] |
Wed, 20 January 2021 00:55 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Chuck. I have heard that story before before but I really wonder about the cold oil part because there is a bypass valve in the oil filter base that does not send the oil to the cooler if the oil is too thick (cold). I am not disagreeing. I am just wondering.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: OEM oil and trans coolers [message #361869 is a reply to message #361808] |
Wed, 20 January 2021 10:42 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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I can see cold oil could be a problem. but in our application I think it is pretty rare situation as most times we are not using our GMC's when that might actually be a major issue. still takes time for radiator to get up to temp, and you are still running plenty of cold oil prior to radiator warm up. having the oil running through the radiator cooler just changing the timing. It might though keep a more "stable" temp. If I do start my GMC in sub zero, I have went to hooking up a magnetic block heater on the oil pan. too many variable factors involved to really know what it does for our coaches long term. There are plenty who have the cooler bypassed with many miles.
as far as transmission temps go, I have never heard someone complain of transmissions running too cool?? with my recent failure of my transmission I also start questioning why it is routed in the radiator. 180 degrees transmission temp is what i understand is on the high side. My coach runs at 195-200. I know the radiator is not near 195 or 200 now per my IR gun. but still I wonder why you would want to run 150 degree transmission fluid through a radiator when you read statements like As a rule of thumb, every 20 degree increase in operating temperature above 175 degrees F. cuts the life of the fluid in half! At 195 degrees F., for instance, fluid life is reduced to 50,000 miles.
Even though I am extremely impressed with my superior aluminum radiator, I don't think they have a very good fluid cooler in it, just my casual observation. it might make up for that because the entire radiator cools so well that it just does not get that hot... my recent transmission destruction I am not reusing the cooler in the radiator. but I have noticed that most tranny coolers are pretty small in size. I bought one, installed it, but now found one twice the size that will go in this spring.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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