Radiator Oil & Transmission Cooler Connections

[robert mueller]

G'day,

I want to double check the connections to the oil and transmission coolers in the radiator, IIRC the oil cooler is 1/2 inch inverted
flare and the transmission cooler is 3/8 inch inverted flare or is it 5/16 inch inverted flare?

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
 

 

[jim kanomata1]

Rob,
The Oil is correct.
The trans std is the smaller.

On Fri, Nov 3, 2017 at 12:36 PM, Rob Mueller
wrote:

> G'day,
>
> I want to double check the connections to the oil and transmission coolers
> in the radiator, IIRC the oil cooler is 1/2 inch inverted
> flare and the transmission cooler is 3/8 inch inverted flare or is it 5/16
> inch inverted flare?
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
>
> _______________________________________________
> 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.appliedgmc.com
1-800-752-7502

 

[jim kanomata1]

The fitting at the radiator is 3/8, bit the nut is a weird one.

> Rob,
> The Oil is correct.
> The trans std is the smaller.
>
> On Fri, Nov 3, 2017 at 12:36 PM, Rob Mueller

>
>> G'day,
>>
>> I want to double check the connections to the oil and transmission
>> coolers in the radiator, IIRC the oil cooler is 1/2 inch inverted
>> flare and the transmission cooler is 3/8 inch inverted flare or is it
>> 5/16 inch inverted flare?
>>
>> Regards,
>> Rob M.
>> The Pedantic Mechanic
>> Sydney, Australia
>> AUS '75 Avion - The Blue Streak TZE365V100428
>> USA '75 Avion - Double Trouble TZE365V100426
>> USA '77 Kingsley - TZE 267V100808
>>
>>
>>
>>
>> _______________________________________________
>> 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.appliedgmc.com
> 1-800-752-7502
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502

 

[Ken H.]

Rob,

IIRC, the OEM transmission line is 5/16", but, as Jim K says, with a weird
nut at the cooler -- because the cooler fitting is 3/8". That's what
allows us to replace the OEM 5/16" lines with 3/8" by changing the fitting
at the transmission from 5/16" inverted flare x 3/8' straight thread to
3/8" inverted flare x 3/8" straight thread

​Manny delivers the unusual 3/8" inverted flare x 3​/8" straight thread
adapter with his TH425 rebuilds.

Ken H.

> G'day,
>
> I want to double check the connections to the oil and transmission coolers
> in the radiator, IIRC the oil cooler is 1/2 inch inverted
> flare and the transmission cooler is 3/8 inch inverted flare or is it 5/16
> inch inverted flare?
>

 

[kosier]

Ken,

I think you'll find those fittings in the transmission are 1/4" straight
pipe thread.
The reason for the odd sized fitting at the radiator cooler is because GM
used
3/8" cooler lines up through 1972. When they dropped to 5/16", it was easy
enough to use the correct fittings at the transmission, but it would have
cost
money to retool the cooler in the radiator. And, of course, if it turned
out that
they had made a mistake, it would have cost even more to go back. Funny!

Gary Kosier
77PB w/500Cad
Newark, Ohio

--------------------------------------------------
From: "Ken Henderson"
Sent: Friday, November 03, 2017 8:43 PM
To: "GMC Mail List"
Subject: Re: [GMCnet] Radiator Oil & Transmission Cooler Connections

> Rob,
>
> IIRC, the OEM transmission line is 5/16", but, as Jim K says, with a weird
> nut at the cooler -- because the cooler fitting is 3/8". That's what
> allows us to replace the OEM 5/16" lines with 3/8" by changing the fitting
> at the transmission from 5/16" inverted flare x 3/8' straight thread to
> 3/8" inverted flare x 3/8" straight thread
>
> ​Manny delivers the unusual 3/8" inverted flare x 3​/8" straight thread
> adapter with his TH425 rebuilds.
>
> Ken H.
>
>
> On Fri, Nov 3, 2017 at 3:36 PM, Rob Mueller

>
>> G'day,
>>
>> I want to double check the connections to the oil and transmission
>> coolers
>> in the radiator, IIRC the oil cooler is 1/2 inch inverted
>> flare and the transmission cooler is 3/8 inch inverted flare or is it
>> 5/16
>> inch inverted flare?
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[jim kanomata1]

We supply the 3/8Brass fitting for the trans with correct thread.

> Ken,
>
> I think you'll find those fittings in the transmission are 1/4" straight
> pipe thread.
> The reason for the odd sized fitting at the radiator cooler is because GM
> used
> 3/8" cooler lines up through 1972. When they dropped to 5/16", it was easy
> enough to use the correct fittings at the transmission, but it would have
> cost
> money to retool the cooler in the radiator. And, of course, if it turned
> out that
> they had made a mistake, it would have cost even more to go back. Funny!
>
> Gary Kosier
> 77PB w/500Cad
> Newark, Ohio
>
> --------------------------------------------------
> From: "Ken Henderson"
> Sent: Friday, November 03, 2017 8:43 PM
> To: "GMC Mail List"
> Subject: Re: [GMCnet] Radiator Oil & Transmission Cooler Connections
>
>
> Rob,
>>
>> IIRC, the OEM transmission line is 5/16", but, as Jim K says, with a weird
>> nut at the cooler -- because the cooler fitting is 3/8". That's what
>> allows us to replace the OEM 5/16" lines with 3/8" by changing the fitting
>> at the transmission from 5/16" inverted flare x 3/8' straight thread to
>> 3/8" inverted flare x 3/8" straight thread
>>
>> ​Manny delivers the unusual 3/8" inverted flare x 3​/8" straight thread
>> adapter with his TH425 rebuilds.
>>
>> Ken H.
>>
>>
>> On Fri, Nov 3, 2017 at 3:36 PM, Rob Mueller

>>
>> G'day,
>>>
>>> I want to double check the connections to the oil and transmission
>>> coolers
>>> in the radiator, IIRC the oil cooler is 1/2 inch inverted
>>> flare and the transmission cooler is 3/8 inch inverted flare or is it
>>> 5/16
>>> inch inverted flare?
>>>
>>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
> _______________________________________________
> 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.appliedgmc.com
1-800-752-7502

 

[LarryW]

It is important to know that there are two fittings that could fit into the transmission for conversion from 5/16 to 3/8 cooler line. The correct one
(don't have the sizes with me right now) the correct one has straight threads to match with the straight threads in the trans case and utilizes a soft
metal washer for sealing. The WRONG adaptor fitting has tapered pipe threads and is intended to match to a female tapered pipe thread hole. Since the
fitting in the trans is straight, it is not a match for the tapered adaptor. It may seem to work when you first screw it into the transmission, and
seems like it will tighten and seal, but if you force it, you run the risk of that the tapered adaptor will put enough force on the trans case and
could crack the trans case. If that happens, you're screwed.

Additionally, if you make the change to 3/8 with the proper straight adaptor, you must be careful not to over tighten it. Over tightening it runs the
risk of stripping the soft aluminum in the transmission. I don't know what the proper torque is for that fitting. Find out before you tighten it down.
JMHO
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

 

[jim kanomata1]

This topic of the correct fitting for converting to a 3/8 line was
addressed in 1996 at International Convention.
One of the guys announced that Jim K had them. I started selling them, then
my source dried up, Gary Kener, our parts guy found the correct ones the
other month and we supply them with our 3/8 tran line kit and also sell
them separately.
For a while I would use a Die and recut the threads.

> It is important to know that there are two fittings that could fit into
> the transmission for conversion from 5/16 to 3/8 cooler line. The correct
> one
> (don't have the sizes with me right now) the correct one has straight
> threads to match with the straight threads in the trans case and utilizes a
> soft
> metal washer for sealing. The WRONG adaptor fitting has tapered pipe
> threads and is intended to match to a female tapered pipe thread hole.
> Since the
> fitting in the trans is straight, it is not a match for the tapered
> adaptor. It may seem to work when you first screw it into the transmission,
> and
> seems like it will tighten and seal, but if you force it, you run the risk
> of that the tapered adaptor will put enough force on the trans case and
> could crack the trans case. If that happens, you're screwed.
>
> Additionally, if you make the change to 3/8 with the proper straight
> adaptor, you must be careful not to over tighten it. Over tightening it
> runs the
> risk of stripping the soft aluminum in the transmission. I don't know what
> the proper torque is for that fitting. Find out before you tighten it down.
> JMHO
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
>
> _______________________________________________
> 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.appliedgmc.com
1-800-752-7502

 

[robert mueller]

G'day,

I measured the tubing and nuts on the Kingsley's radiator today and compared the measurements to inverted flare nut drawings on
McMaster - Carr.

Transmission cooler 3/8" inverted flare nuts:

https://www.mcmaster.com/#6432t137/=1a46bw3

Engine oil cooler 1/2" inverted flare nuts:

https://www.mcmaster.com/#6432t138/=1a46cgx

I have ordered fittings that mate to the HotFlush system's QD's so I can bring an aluminum radiator I bought from Larry Weidner and
an OEM radiator that Scott Nutter gave me to a transmission shop and have them clean them.

I will instruct the transmission shop to flush the contamination that collects on the HotFlush machines filter screen into a plastic
food box so I can spread it on a piece of white paper and photograph it.

I wish I was still working at NASA we had microscopes that we would put contamination cleaned out of the Portable Life Support
System and examine it to determine what it was and the size.

I will examine the ports in the transmission tomorrow and report what I find.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Larry
Sent: Saturday, November 4, 2017 9:29 AM
To: gmclist
Subject: Re: [GMCnet] Radiator Oil & Transmission Cooler Connections

It is important to know that there are two fittings that could fit into the transmission for conversion from 5/16 to 3/8 cooler
line. The correct one (don't have the sizes with me right now) the correct one has straight threads to match with the straight
threads in the trans case and utilizes a soft metal washer for sealing. The WRONG adaptor fitting has tapered pipe threads and is
intended to match to a female tapered pipe thread hole. Since the fitting in the trans is straight, it is not a match for the
tapered adaptor. It may seem to work when you first screw it into the transmission, and seems like it will tighten and seal, but if
you force it, you run the risk of that the tapered adaptor will put enough force on the trans case and could crack the trans case.
If that happens, you're screwed.

Additionally, if you make the change to 3/8 with the proper straight adaptor, you must be careful not to over tighten it. Over
tightening it runs the risk of stripping the soft aluminum in the transmission. I don't know what the proper torque is for that
fitting. Find out before you tighten it down.

JMHO
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

 

[robert mueller]

G'day,

I measured the tubing and nuts on the Kingsley's radiator and compared the measurements to inverted flare nut drawings on McMaster -
Carr.

Transmission cooler 3/8" inverted flare nuts:

https://www.mcmaster.com/#6432t137/=1a46bw3

Engine oil cooler 1/2" inverted flare nuts:

https://www.mcmaster.com/#6432t138/=1a46cgx

I will buy nuts and make up short pieces of tube that will mate with the radiator and the male QD's that come with the HotFlush
machine.

I will instruct the transmission shop to flush the contamination that collects on the HotFlush machines filter screen into a plastic
food box so I can spread it on a piece of white paper and examine it. If feasible I'll photograph it as well.

I wish I was still working at NASA as we had microscopes that we would put contamination cleaned out of the Portable Life Support
System and examine it to determine what it was and its size.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808

 

[cesar carrasco]

Rob, does it matter that the nuts are for copper and brass tubing?

On Sat, Nov 11, 2017 at 7:39 AM, Rob Mueller
wrote:

> G'day,
>
> I measured the tubing and nuts on the Kingsley's radiator and compared the
> measurements to inverted flare nut drawings on McMaster -
> Carr.
>
> Transmission cooler 3/8" inverted flare nuts:
>
> https://www.mcmaster.com/#6432t137/=1a46bw3
>
> Engine oil cooler 1/2" inverted flare nuts:
>
> https://www.mcmaster.com/#6432t138/=1a46cgx
>
> I will buy nuts and make up short pieces of tube that will mate with the
> radiator and the male QD's that come with the HotFlush
> machine.
>
> I will instruct the transmission shop to flush the contamination that
> collects on the HotFlush machines filter screen into a plastic
> food box so I can spread it on a piece of white paper and examine it. If
> feasible I'll photograph it as well.
>
> I wish I was still working at NASA as we had microscopes that we would put
> contamination cleaned out of the Portable Life Support
> System and examine it to determine what it was and its size.
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

 

[robert mueller]

Cesar,

Nope, they will only be connected for the cleaning process (hours).

Over a long period there can be problems with dissimilar metal corrosion but in this case it's not a problem.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808


-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of Cesar Carrasco
Sent: Saturday, November 11, 2017 10:37 AM
To: gmclist
Subject: Re: [GMCnet] Radiator Oil & Transmission Cooler Connections

Rob, does it matter that the nuts are for copper and brass tubing?