Oil Cooler

D

d c *mac* macdonald

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Nov 22, 2009
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Does anyone have an idea as to suitability of this cooler for our coaches? I hope to get a a replacement engine in my coach and I already have a new aluminum radiator to install.

(http://www.ebay.com/itm/382882520473)

D C "Mac" Macdonald
Amateur Radio K2GKK
Since 30 November '53
USAF and FAA, Retired
Member GMCMI & Classics
Oklahoma City, OK
"The Money Pit"
TZE166V101966
'76 ex-Palm Beach
k2gkk + hotmail dot com
[https://i.ebayimg.com/images/g/jGUAAOSwahlbzPOF/s-l400.jpg]http://www.ebay.com/itm/382882520473
Tru-Cool 4588 19,000 GVW Cooler Fluid Oil Tow Towing RV HD Truck Transmission | eBayhttp://www.ebay.com/itm/382882520473
Part number: 4588.
www.ebay.com
 
I am also working on a cooling solution for engine coolant/engine oil/transmission fluid as a result of a new engine and prior owner mods and
solutions.

This Hayden page speaks to transmission cooler scenarios
https://www.haydenauto.com/en/technicians-resources/faq-transmission-oil-coolers

This page has more of their product line, and if you dig in, you see their heavy duty engine oil coolers have 1/2 inch ports, and most of the lighter
duty and transmission have 3/8.
https://www.haydenauto.com/media/5475/oil-cooler-brochure_individual-pages.pdf

Other brands show AN8 for engine oil heavy duty, and AN6 for tranny and engine oil light duty.

My take on the cooler you linked to is that it is not sized internally for engine oil, but transmission fluid. Will it work? Probably EXCEPT a high
stress/high flow situation like if it is hot day, overloaded, and a long steep incline. We need high flow in that situation.

I am going with an engine oil cooler for a mid 80's RX7 that you can search on ebay. $80-100 and mounting on the front frame. I will be using an
inline or sandwich oil thermostat bypass, leaning toward inline as the sandwich does not really let much skip the cooler when cold. AN8 fittings into
the cooler, and can reuse the OEM 1/2 inch hoses with some modifications. My new tranny cooler is internal with the radiator I chose, and I will use
all metal 3/8 line to connect.

My two cents...

--
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
 
If you have a new radiator I do not see the need for an external oil cooler, unless that new radiator was in play when the engine failed.

The ebay oil cooler would not be my choice because from what I see it uses nipples for hoses/hose clamps. I would want to stick with a flair type
connection or better high pressure hose/connections.

--
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
 
> If you have a new radiator I do not see the need for an external oil cooler, unless that new radiator was in play when the engine failed.
>
> The ebay oil cooler would not be my choice because from what I see it uses nipples for hoses/hose clamps. I would want to stick with a flair
> type connection or better high pressure hose/connections.
>
> But maybe i am reading this wrong and this would be for a tranny cooler. If that is the case, I think this looks like it would make a good
> tranny cooler.

Jon is very correct about the connections. That would worry me.
Another issue is that this cooled will need a temperature controller. Without which the lube oil temperatures could run dangerously low.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit
 
Are we looking for a better mousetrap here, or has your old one become
suspect because of a grenade-ed engine?
If that's the case, my advise to you would be to "DO NOT USE ANY PART
OR PARCEL OF YOUR OLD SYSTEM, particularly the in radiator cooler and the
lines to and fro.
I would personally stay away from aftermarket coolers not specifically
designed to cool engine oil, also.
But, it is your risk, your decision, your money. Spend it
intelligently. But, don't chase good money with more good money without
good reason.
Jim Hupy
Salem, Oregon

On Sat, Apr 4, 2020, 6:40 AM Jon Roche via Gmclist
wrote:

> If you have a new radiator I do not see the need for an external oil
> cooler, unless that new radiator was in play when the engine failed.
>
> The ebay oil cooler would not be my choice because from what I see it uses
> nipples for hoses/hose clamps. I would want to stick with a flair type
> connection or better high pressure hose/connections.
>
>
> --
> Jon Roche
> 75 palm beach
> EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
We stock ad sell only these Plate style as it performs better than the tube.
One for trans is different than the Oil.
Keep in mind that it needs to be mounted at least one inch to the radiator
to have the fan pull through it at lower speeds and even hihg as air will
go around it more tha through.

On Sat, Apr 4, 2020 at 10:45 AM Hal StClair via Gmclist <

> I used three of these on my install;
> https://www.summitracing.com/parts/bmm-70274
> I use one for the trans in series with the radiator and two for the oil
> (with a thermostat). Nice unit.And they really work.
> Hal
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1975 Eleganza II, 101230,
>
> 1974 Eagle Bus 45',w/slideout,
>
> Rio Rancho, NM
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502
 
Hey Larry,
Thanks for the pics link, I missed those earlier. Would you elaborate what caused the problem that possibly contaminated the RX7 cooler? Especially if
it was a heat/cool related issue. Not sure if I am hearing correctly, did you put the 500 in, it failed after a period of time and you had to re-do?
Thanks
--
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
 
> Hey Larry,
> Thanks for the pics link, I missed those earlier. Would you elaborate what caused the problem that possibly contaminated the RX7 cooler?
> Especially if it was a heat/cool related issue. Not sure if I am hearing correctly, did you put the 500 in, it failed after a period of time and you
> had to re-do?
> Thanks

HI Tiler,
Not heat/cool related. The Cad 500 has an unusual type of Rocker arm system. A "T" pedestal for each cylinder that has a rocker arm on each side of
the T with spring steel clips that hold the rockers in place. One of those springs broke and the rocker arm fell off, pushrod came out, lifter popped
out of it's bore, so oil pressure dropped to 0. That lack of oil did damage to rod and main bearings. Those bearing particles spread throughout the
engine and the cooler. It is almost impossible to get all of the debris out of coolers. Not wanting to chance debris taking out my next engine, I had
to scrap the RX7 cooler, the internal radiator cooler, and go to another cooling source. The story is longer than that so this is a condensed
version, The whole story is not worth repeating unless you are considering a Cad 500 install.
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
 
BTW, What I liked about the RX7 cooler is that it has a thermostat built in, that Below 170*, it sends the oil back to the engine. Over 170* it
diverts oil into the radiator portion of the cooler. I could not find a new aftermarket RX7 cooler the had the built in thermostat. And could not
find a used original RX7 that I thought I could trust. Like I said....a long story.

http://www.gmcmhphotos.com/photos/engine-oil-cooler-for-my-500/p13469.html

--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
 
Thanks Larry, and I know that was a frustrating sequence of events! I was going to put the rx7 cooler in the bottom of the radiator frame, but it was
about 1/2 inch too tall, and that frame is already pretty exposed down there. So I am now working on putting it in the frame like you did. I have not
found any with a built in thermostat like what you had. The Hayden 225 does not actually stop any oil from going to the cooler when cold, it only lets
a little bit bypass when cold. I took a picture in my kitchen test of it:

http://www.gmcmhphotos.com/photos/data/7272/medium/S6300721.JPG

--
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
 
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