Use of compression fittings on steel tranny cooler lines?
#2608579
01/18/19 02:22 PM
01/18/19 02:22 PM
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Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
OP
master
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OP
master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
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My question is, are brass compression fittings on a mild steel line strong enough to effectively seal and hold tight enough for transmission line pressures? I'm now using a barbed hose end attached to a standard compression fitting to better lock the rubber hoses on the lines.
The history of the situation. I had just cut the end of my trans cooler lines near the radiator to add a plate cooler. I used a small line cutter, deburred the lines, flared the end slightly with a tube flaring tool and used the correct transmission/power steering hose and two EFI style hose clamps, as they don't tend to cut the rubber hose like the Hygear clamps do.
I had issues with seepage and even had one hose come off and pump trans fluid all the way to my favorite taco stand.
During Normal driving the 200R4 never gets above 160. It takes it a while to warm up to that too. It has a deep pan, one plate cooler and it goes through the radiator cooler first to help the fluid warm up for daily driving; and then through the plate cooler and back to the transmission.
When I do repeated drag passes 3 or 4 or more, the fluid temp climbs to 220 and will go higher if I don't let it cool for half an hour. In order to combat this, I am adding a second plate cooler and am plumbing 2 ball valves just before the radiator cooler.
I open the ball valve and close the bypass valve so the fluid flows through the radiator cooler first to get some heat into the fluid for daily driving days.
I can then close that valve and open the second bypass valve, so the fluid bypasses the radiator and flows only through just the plate coolers.
I'll follow up later and report on how effective this is on keeping my fluid temps under control.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Use of compression fittings on steel tranny cooler lines?
[Re: jbc426]
#2608684
01/18/19 05:58 PM
01/18/19 05:58 PM
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Joined: Mar 2007
Posts: 3,287 West Coast, USA
jbc426
OP
master
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OP
master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
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Peace of mind. Thank you guys!
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Use of compression fittings on steel tranny cooler lines?
[Re: B1MAXX]
#2608752
01/18/19 08:41 PM
01/18/19 08:41 PM
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Joined: May 2003
Posts: 6,569 Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,569
Downtown Roebuck Ont
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Cooler lines aren't at line pressure. maybe 5-30 psi. as I recall. My pick-up truck has been like this forever also. I thought they could spike momentarily to 90 psi or more shifting into reverse. I was told that was why it was never a good idea to use the rubber hose kits that come with most coolers on a Torqueflite. In any case a compression fitting is adequate to hold any pressure that might turn up in a cooler line. Kevin
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Re: Use of compression fittings on steel tranny cooler lines?
[Re: jbc426]
#2608889
01/19/19 03:35 AM
01/19/19 03:35 AM
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Joined: Jun 2005
Posts: 6,257 gulfport, ms, west mi
rowin4
master
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master
Joined: Jun 2005
Posts: 6,257
gulfport, ms, west mi
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I have used them on transmission lines , gas lines and also brake lines with no problem. On the brake ;one, it was a quick fix until I replaced the the rusted line. I would say the brake line is probably not a good long term fix .
it's ok to butt heads, just don't do it with a butthead
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