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ZF 6 speed Flush

Old 08-21-2014, 08:31 PM
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Default ZF 6 speed Flush

Hello.

Saw this video the other day
flushing the fluid from a Japanese (I guess) auto.

Seems pretty simple if:
  1. The transmission can mechanically do this correctly - i.e renew the fluid this way
  2. You are very careful
  3. You are brave and/or thick skinned
This fellow has the advantage that his auto can be filled from the top and has a dipstick.



Has anybody heard of this being done on a 6HP** auto via the cooling lines?


Is this what commercial shops do somehow?



Cheers
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Old 08-22-2014, 07:34 PM
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You could do that but the tranny coolant lines are at the bottom of the radiator on the driver's side .

So not really convenient to get to them w/o the car being lifted.

Also the lines use high pressure push-on fittings which make mating to any other lines a bit of a challenge

I plan to partially drain my unit this way next drain to get the dirty fluid out of those lines as well as out of the pan.
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Old 08-25-2014, 02:12 AM
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Yes - I figured I would need to make an adapter for the lines - but I got a lathe so unless its got an odd geometry I should be OK.

My biggest fear is oil starvation - I would like to come up with a 1:1 input/output system with as little manual intervention as possible.

I wonder what pressure the pump runs at - couldn't find any specs on this.
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Old 08-25-2014, 06:35 AM
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That sounds like a little over the top for effort but doable I presume.

I can't imagine it would be a high pressure amount, but w/o that # it is a guess.

You can do a static drain that should clear a good amount out right at the cooler lines,
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Old 08-26-2014, 11:29 PM
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Half the fun is making the tools.

Especially if they work well and get used again - by me or somebody else.

Static drain - do you mean when I empty the pan or just unplug the cooler and let it drain?
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Old 08-27-2014, 06:35 AM
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Static drain is releasing the lines at the cooler so the fluid can drain by gravity.

If you have time to machine parts that's great.

I sure don't.
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Old 08-28-2014, 11:03 AM
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So here is the pressure info direct from ZF:

"The pump is making about 17 bar (246.56 psi) but the valve body reduces and regulates it to about 5 bar (72.519 psi) to the clutches"
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Old 08-29-2014, 04:26 PM
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Thanks for digging that up. I wonder if 5 bar is carried through the rest of the system (cooling, torque converter).
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Old 08-29-2014, 05:43 PM
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He only states regulation to the clutches of 5 bars.

My guess is that for cooling the fluid is flowing at high pressure.

You can imagine how the torque converter will heat that fluid very quickly.
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