| Flushing Trans and Oil Cooler Lines [message #352393] |
Tue, 25 February 2020 20:03  |
Melbo
Messages: 144
Registered: August 2018
Location: Albuquerque NM
Karma: 0
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What do you use to flush transmission cooler and oil cooler lines. I am reinstalling the radiator and want to flush the cooler lines before reinstalling them. The metal trans lines I can use refrigerant line flush and it is volatile enough to evaporate and not hurt the metal lines BUT the oil cooler lines are metal and rubber hose and I want them to be cleaned out but what is the best to clean them with.
Thanks in advance for suggestions.
Melbo
Albuquerque NM Bus Conversion 1978 MCI 1973 GMC
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| Re: Flushing Trans and Oil Cooler Lines [message #352399 is a reply to message #352393] |
Tue, 25 February 2020 21:46  |
George Beckman
Messages: 1085
Registered: October 2008
Location: Colfax, CA
Karma: 11
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I am getting ready to install a new engine. My way is to replace the cooler lines and bypass the radiator cooler with a new external. My engine has not come apart (yet), but I don't want one speck in the system. Make sure you flush the filter adaptor as well.
'74 Eleganza, SE, Howell + EBL
Best Wishes,
George
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| Re: [GMCnet] Flushing Trans and Oil Cooler Lines [message #352405 is a reply to message #352404] |
Wed, 26 February 2020 06:40 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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"Excessive" caution is needed when cleaning coolers, especially engine
coolers. I had a long talk just yesterday with a long-time NASCAR mechanic
(who happens to own 11 GMC's at the moment). He mentioned a recent engine
rebuild which he completed. He rigged an elaborate recirculating flusher
for the coolers. He said that he ran the flusher on the engine cooler for
many hours before the visible filter he used was clean. When he finally
connected the cooler to the engine, he included a return line filter which
he checked periodically for 3 frequent oil changes before all traces of
debris disappeared. His comment about the transmission cooler being easier
to clean makes me think it may be a simple tube through the radiator, but
that's a WAG -- who knows from personal experience?
Ken H.
On Wed, Feb 26, 2020 at 1:24 AM Vadim Jitkov via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I used Lubeguard Kooler Kleen transmission line flush to clean out
> transmission cooler after transmission failure. It worked well and you can
> see the
> gunk that got flushed out and run it until flow is completely clear. One
> can was plenty big to get clean flow from the trans cooler. Having two cans
> might be better if you are working with thick oil in the engine oil
> cooler.
> Here is the link to this stuff:
>
> https://www.amazon.com/gp/product/B001DKNH8I/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1
> --
> Vadim Jitkov
> '76 Glenbrook 26'
> Pullman, WA
>
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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: Flushing Trans and Oil Cooler Lines [message #352409 is a reply to message #352393] |
Wed, 26 February 2020 08:05 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Didn't someone - Rob maybe - take the end off a radiator and take some pictures of the coolers?
Since the last engine failed from a broken crankshaft, even after having the radiator cleaned with pumped hot brake fluid I didn't reuse the oil cooler on the new engine. If it seems hotter than I like, I'll install an outboard cooler. Belt and suspenders.
--johnny
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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| Re: [GMCnet] Flushing Trans and Oil Cooler Lines [message #352415 is a reply to message #352409] |
Wed, 26 February 2020 09:09 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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I asked why he went to so much trouble to save the OEM oil cooler instead
of just installing an external one. "I don't trust them. I've lost at
least one engine because of a failure." I don't share that concern -- I've
run both for many years without any problem -- 'tho' I use hard lines
between the in-radiator and the add-on.
Ken H.
On Wed, Feb 26, 2020 at 9:06 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Didn't someone - Rob maybe - take the end off a radiator and take some
> pictures of the coolers?
> Since the last engine failed from a broken crankshaft, even after having
> the radiator cleaned with pumped hot brake fluid I didn't reuse the oil
> cooler on the new engine. If it seems hotter than I like, I'll install an
> outboard cooler. Belt and suspenders.
>
> --johnny
> --
> 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
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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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: Flushing Trans and Oil Cooler Lines [message #352418 is a reply to message #352393] |
Wed, 26 February 2020 09:59 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I share his concern, but I'll do your solution if I add one. I had one fail, fortunately as I( was backing into an RV spot at the Anniston Army Depot. Instead of lunching the mill, I oiled the pad substantially before I shut it down. It was installed on flex lines, but even with them secured about a foot away they had moved enough to fail the input line to the cooler. If I install another, it will have solid lines bolted to something substantial.. likely the cross member in front of the radiator.
--johnny
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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