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Power steering reservior leak

 
Old 09-10-2013, 02:13 AM
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s500 GL450 GL63 Z71XL Yukon 67 396 SS velle 68 Vert Camaro 69 RSSS Vert Camaro 75 Blazer
Power steering reservior leak

I have had a power steering fluid leak for about 6 months now. It has made a mess of my drive way. I have been trying to track down the leak but I was not able to see where it was originating from. All I knew was that it was coming from the pump/reservoir area. Every few weeks, I would have to fill with more power steering fluid. I put some dye in the reservoir but I was still not able to find the leak. It was not coming from the steering rack nor the hoses. All I knew was that it was coming from behind the reservoir so I preceded to remove it.

There are 3 torx bolts size T30 that is needed to remove the reservoir from the front. Once those are removed, there is C clip behind the reservoir that holds it into the power steering pump. Once that is removed, you can firmly pull the reservoir out without having to pull out the other hose and clamp. Be prepared to have the remaining power steering fluid leak out from the bottom of the reservoir. I looked at the rubber O ring seal and it seemed a little flat and worn form some reason. Having done this on a Sunday meant that I would not be able to get the O ring from the local MB parts counter. Well, I have been hoarding all those O rings that are used for the engine oil filter change. It fits perfectly on the male tube that goes into the reservoir. the difference between the O rings are that the one that is used for the power steering reservoir is a flat O ring and the one that I used from the oil filter is round. You do have to push firmly on the reservoir to get it seated. I got it in, bolted the reservoir back, put the C clip back (which was a pain) and so far, 3 week in , no leaks.

For installing the C clip, I would suggest that you tie a small string or twine to it because it will fall to the bottom air deflector a few times. You can cut it off later. Lucky for me, it didn't go lost in the engine compartment. After I tied the twine to it, it was easier to keep hold of. Pushing the C clip in was a task until I got a long flat head screwdriver and angled the rear of the screw driver towards that headlight and force the c clip in. You will probably not be able to push it in with your fingers as it is a very sturdy C clip.

I hope this helps someone.
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Old 11-03-2013, 07:42 PM
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2008 gl450 4matic fully loaded
Smile power steering seal

its most likely your power steering seal aka o ring , 2 dollar part , 45 minutes labor, thats why you can't see it, if you go to mercedes they will till you the whole power steering reservoir needs to be changed out. 370 with part and labor.
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Old 08-23-2015, 08:11 AM
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Nice write up!

I did the job on my vehicle. Here's a nice video on the subject:
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Old 08-23-2015, 01:43 PM
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E55, SL600, GL450, GL63
Great write up! Thanks for sharing.
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Old 12-03-2015, 06:14 PM
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Ml350
C clamp for power steering reservoir

Originally Posted by nickfargo View Post
its most likely your power steering seal aka o ring , 2 dollar part , 45 minutes labor, thats why you can't see it, if you go to mercedes they will till you the whole power steering reservoir needs to be changed out. 370 with part and labor.
Just wonder if you know what size c clamps are needed for the ml350? My husband lost it some where down in the engine and we have to finish repairing it tomorrow!
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Old 04-09-2019, 05:51 PM
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2004 E500 Wagon
I put in the o-ring (o ring and reservoir bought from dealer) and felt the thing "click" back into place. I put the C-clip in without too much issue, and it's sitting where the guide-path is (like a channel on the plastic). But I've still got a leak while the car sits.
Did you all notice something that was easy to miss in there? I've got the star nut (in my E class it's just one) in properly snug (feel like I might crack the plastic if i go more).

Thanks for any guidance,

Ridwan
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