| Re: [GMCnet] Radiator Oil & Transmission Cooler Connections [message #325762 is a reply to message #325731] |
Sat, 04 November 2017 20:43  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
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Senior Member |
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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@list.gmcnet.org] On Behalf Of Larry
Sent: Saturday, November 4, 2017 9:29 AM
To: gmclist@list.gmcnet.org
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.
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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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