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Old 04-17-2022, 03:33 PM
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E70 power steering leak - seals replaced still leaks

Hi there. We are having some issues with our beloved 2007 E70 3.0 with adaptive drive. The e70 does NOT have active steering.

The power steering is leaking at the point where the metal lines return to the upper part of the rack and are held in place with a triangle shaped metal plate and torx screw. I attached a picture from on-line as it is better than the angle I can get on the car.

This first happened about 2 months ago. I released the metal plate and replaced the O-Rings at the end. 2 weeks later it leaked again on the upper line, this time I added a second o-ring (which I would normally not do). 2 weeks later it leaked again and I replaced the lines with aftermarket lines which had new o-rings on them. 3 days later it leaked again, this time on the lower line - checked the o-rings which have no sign of damage or swelling and this time I tightened down the plate holding the lines in till it sat flush. that was good for about 2 days and here we are.

I'm at a loss for what is causing this. Using an inspection mirror I see no damage to where the o-ring seats. Looking on realoem I don't see any sort of pressure accumulator or other componentry. best guess is that the pressure is building up and causing the leak as it is exceeding what the seals can hold.

thoughts on what could be causing this?
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Old 04-17-2022, 03:42 PM
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I bet you are onto something with excess pressure. Internal filter plugged?
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Old 04-17-2022, 03:50 PM
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Originally Posted by andrewwynn View Post
I bet you are onto something with excess pressure. Internal filter plugged?

hmmm...that would make sense. I wasn't aware of any filters in this system, thoughts on where that might be?
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Old 04-17-2022, 03:52 PM
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Nope just have read about it. I've read that people will back flush through the filter and use turkey baster to remove the fluid. It might be a blessing that the seal is acting as a relief valve and not exploding something
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Old 04-17-2022, 04:18 PM
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Nope just have read about it. I've read that people will back flush through the filter and use turkey baster to remove the fluid. It might be a blessing that the seal is acting as a relief valve and not exploding something
I suppose it could be worse The only reference to a filter I can find in the in the reservoir which seems to be passing oil with no issue. I don't mind replacing it, though I would like to better understand what is happening.

https://www.ecstuning.com/b-genuine-...r/32416782538/
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Old 04-17-2022, 07:04 PM
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That's the filter. Look for a check valve. Not sure it's has one but malfunction check valve I could see being a problem.


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Old 04-21-2022, 06:42 PM
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I spoke with the local Indy on this - sounds like they have been through this. summary of the conversation:
  • sometimes new o-rings work
  • sometimes aftermarket replacement lines work if the o-rings alone did not
  • sometimes the BMW lines work when the aftermarkets did not
  • they no longer replace the lines or o-rings - they replace the rack as they have had too many issues with leaks for o-ring, non-oem lines and oem-lines.

for us - we are going to RTV the seals and see if that does it, if not I'll swap the rack.
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