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better cooling techniques for the ATF NEEDED
Posted by dasa (more from dasa) on Tue, 9 Jan 2001 21:21:17
In Reply to: Re: Yet Another Automatic Gearbox problem.. :-(, Ari
[Profile/Gallery]
, Tue, 9 Jan 2001 16:47:55
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automatic transmission fluid (ATF) transmits power in the torque converter, activates clutches and bands, controls hydraulic valves, lubricates gears, bearings and bushings, and cools the transmission. Saab trany are not electronic but hydraulic.
At elevated operating temperatures, ATF oxidizes, turns blackish. As heat destroys the fluid's lubricating qualities and friction characteristics, varnish begins to form on internal parts. If the temperature gets above 250 degrees F., rubber seals begin to harden, which leads to leaks and pressure losses. At higher temperatures the transmission begins to slip, which only aggravates overheating even more. Eventually the clutches burn out and the transmission calls it quits.
As a rule of thumb, every 20 degree increase in operating temperature above 175 degrees F cuts the life of the fluid in half.
ATF is cooled by a small heat exchanger inside the bottom of the radiator. Hot ATF from the transmission circulates through a short loop of pipe and is thus "cooled". ATF that enters the radiator cooler at 300 degrees F. would leave at 240 to 270 degrees F., which is only a 10 to 20% drop in temperature, and is nowhere good enough for extended fluid life.
I have a 92 9KT automatic and I change the ATF along with the oil change.
New vs used vs rebuilt is a tough call. If you plan to keep the car for long then a rebuilt with warranty would be the way to go. If dammage is not extensive some specialized garage would rebuild it for less.
It may be time to explore better cooling techniques for the ATF in the 9K
Anyone with suggestions?
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