S-Class (W220) 1999-2006: S 320 CDI, S 320, S430, S 500, S 600

Mysterious Power Steering Leak 2

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Old 12-07-2010, 11:30 PM
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Mysterious Power Steering Leak 2

So after not noticing any leaks after refilling the power steering reservoir and driving it around I found a small puddle the next evening after the car sat for 1 day. After wiping everything down to see if I can trace the leak I noticed oil was seeping out of the item below. I would wipe it clean and notice fluid seeping right under the black cap or whatever it is called.

Can I just remove it and replaced some seals and tighten it back up? Not sure if it even screws off or not.

Thanks for any help

Old 12-08-2010, 11:31 AM
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96 and 08 911 turbos
That is the steering rack. From what I can see EPC does not show a part number for the bolt or any associated seals, which leads me to believe MB intends your to replace the rack if that is leaking.

Somebody may have developed an alternate solution. It looks like that black bolt is simply a banjo bolt. Its possible there may be a set of seals/washers in there that need to be replaced.

If you need a new rack www.carsteering.com has good replacements for about $500
Old 12-08-2010, 12:32 PM
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Thanks for the reply. I spoke with an MB tech and he mentioned he has seen them leak at that spot before. He also mentioned I could get new seals so will go to the dealer and see if they do in fact have any.

Thanks again
Old 12-08-2010, 06:20 PM
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2000 S430 140k (07/11)
There are 2 of those seals, seal ring is available. Part #0249977148

Also 2 repair kits available with O rings
2204600151 for long oil line
2204600551 for short oil line
Old 12-08-2010, 08:41 PM
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Thanks for the info. Had to order the seals because the dealer didn't have any. I was worried that I wouldn't have the correct torx socket to remove the plug so when I got home I tried a few wrenches just for fun and I was able to find one that grabbed it. To my surprise it was loose. I was able to tighten it down what seemed about 1/8 of a turn

Wiped all the fluid clean and keeping my eye out for leaks. Hope this was the culprit.

If this was the cause would it still be a good idea to replace the seals?
Old 12-09-2010, 06:42 PM
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I would think so.
Old 12-09-2010, 06:56 PM
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If tightening fixed the leak I say don't touch the seals ... They have taken a set shape and are nice and gunked up, new seals may cause problems where none exist
Old 12-10-2010, 01:14 AM
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Good news, it just needed to be tightened

After tightening I let it sit overnight and no leaks in the a.m. Drove it today and still all good so a quick oil change before I button up the bottom and I should be good.

Thanks for all the replies and info.

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