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| | | | Joined: Sep 2007 Posts: 31 Apprentice | | Apprentice Joined: Sep 2007 Posts: 31 | I have a '49 3100 and the lines from the tranny cooler are leaking. I know, not exactly stock (TH350). There are hard lines coming from the tranny and flex hose coming from the cooler. Joining the two are some type of compression fittings, and the junction is near the motor mounts. The compression fittings are leaking. I've tried to tighten them up to no avail. Are these necessary? I would like to remove
1949 5 Window 3100
| | | | | Joined: Aug 2007 Posts: 1,859 Grumpy old guy playing with trucks, cars, and boats | | Grumpy old guy playing with trucks, cars, and boats Joined: Aug 2007 Posts: 1,859 | yes, there is pressure on the trans cooler lines, however it is under 40 psi. If you are using compression fittings and it is leaking, something is wrong. I would run new lines.
The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me
| | | | | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | Watch for housing cracks where the brass cooler line adapters go into the aluminum. People over tighten them and crack the trans. After that the only fix is replacement,
Scott | | | | | Joined: May 2005 Posts: 8,878 . | | . Joined: May 2005 Posts: 8,878 | Also only use rubber hose that is intended for transmission fluid. Regular fuel line won't last.
Grigg | | | | | Joined: Feb 2004 Posts: 29,819 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,819 | The trans cooler lines carry "lubrication" pressure, usually 30 lbs. or so on the line coming from the trans to the cooler. The return line carries noticeably less than the other one.
Compression fittings have a habit of leaking if they're overtightened and the ferrules are distorted. The only good fix is to cut the line back about 1/2" and put a new ferrule onto an undamaged section of line. The quick fix is to eliminate the compression fitting altogether, and simply put a small bulge in the end of the line with the first stage of a double flaring tool, creating a knot to retain the rubber hose, then clamp it with a screw-type fuel line clamp. Trans cooler hose is a little heavier than rubber fuel line, and rated for higher temperature and pressure. Another good option is to use the same type hose that's found on the return side of a power steering pump.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
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