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Location:
melb
Registered:
May 2002
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draining/flushing auto fluid
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Sun, 18 January 2004 04:53
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ok this is for a R31 skyline but autos are basically the same right.
Ive got water in the gearbox, I drained the fluid once and put new stuff in but it hasnt helped much.
how do you fully drain the trans as taking the pan off seemed to get only 3.5 - 4.0 Lt of the supposed 5.5Lt. I think the torque converter didnt drain
could I disconect one of the trans cooler lines and run the motor do you think that would do any damage?
If I did that would I need to put it in gear and lift the rear wheels off the ground so the gearbox operates.
any ideas please.
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Location:
Brisbane
Registered:
February 2003
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Re: draining/flushing auto fluid
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Sun, 18 January 2004 05:20
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no - if you run the auto box without fluid - all the bearings/seals/clutches/etc that rely on trans fluid for lubrication will not be lubricated therefore doingso will lead to possible wear/damage/destruction in the gearbox.
also, it uses the fluid to take heat away from the gearbox so things will get hotter than designed for.
also 2, most of the hardwarein the gearbox is hydraulic and requires the fluid for things to work.
note: you can replicate the destructive natureof what you're proposing by dumping the oil out of your engine and then running it til it seizes... 
talk to an autogearbox place about it.
is the fluid emulsifying with the water? or are you getting globs of water on top of the fluid? if the later, then you should be able to 'drive' it out by getting the fluid temps close to water boiling point.
plan B would be to dump the oil, heat wasted fluid up to drive out water, refiull gearbox with heated out and run to 'collect for water... repeat until water is gone??
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Location:
1st street on the right
Registered:
November 2002
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Re: draining/flushing auto fluid
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Sun, 18 January 2004 07:33
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It will kind of mix with the auto fluid, making it pinkish. There was another thread here by memory detailing how to do this.
This is from planet soarer.
"FLUSHING THE OLD FLUID
Regardless of the type of ATF a transmission requires, it?s important to replace as much of the old fluid as possible when servicing the fluid and filter. Some flushing machines connect to the ATF cooler lines to simultaneously drain the old fluid while adding fresh fluid. This is done while the engine is idling and fluid is circulating through the cooler lines. With this type of equipment, various adapters are required to make the connections. Some units have a booster pump to speed up the process on vehicles where ATF flow is slow (some Asian transmissions). This type of flushing procedure does not require dropping the pan or replacing the filter, but a filter replacement is recommended and should be done after flushing (fresh fluid from the pan can be recovered and put back into the transmission after the filter has been replaced to eliminate waste.)
You can flush the fluid yourself at home without any fancy equipment. I just flushed a ZF 4 speed trans - same principles apply. Undo the top oil cooler line going into the radiator. Put a large diameter clear plastic hose over the brass thread on the radiator. Place the end of the hose into a container. Start the car for 2-4 secs and observe the oil going through the hose. Mine started out looking like mud. Turn car off. Place funnel in dipstick and refill trans with fresh oil. Start car again for 2-4 secs and watch the fluid again. I used a graduated clear plastic bottle - I knew how much oil was coming out - so I knew how much oil to put back in. When the oil started to look clear and red then I was done - took 12 litres of fluid to get it to this stage. Reassemble the oil cooler line, check level - go for a drive - check level again. Capacity is about 8 litres. Draining the pan or sucking it out the dipstick I could only get 2 litres out at a time no matter what I did. "
At http://planetsoarer.com/autotrans/autotrans.htm
Alternately you may be able to suck it through the filler tube.
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Location:
Rocklea qld
Registered:
February 2003
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Re: draining/flushing auto fluid
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Sun, 18 January 2004 09:02
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i was told by a professional that you drop a tranny line and run the car but at the same time you have to be putting more gearbox oil in so it doesnt run dry. That is the best way to clean them but does use a bit of fluid.
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