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Discussion Starter #1
I have a small leak from one of the hydraulic fittings that connect the flexible hose to the Trunks Hydraulic pump body. I can see two of these on the side of the pump. Only one is leaking.

Does anyone know the size of the O-ring and torque that I need for a good hydraulic seal? :devil

I know the whole assembly is described as sealed but we also know it's not sealed as we can top off the reservoir etc. to fix trunk opening/closing issues.
 

W220 Moderator
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Hi,

Just order a new pair of copper washers from MB, they will cost you buttons :wink

As for torque, do it up sensibly tight and if you still have a weep nip it up a bit more, in fact you could try nipping it up an 1/8 turn first, it may well cure the problem :wink

HTH,

Dave
 

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Discussion Starter #3
Thanks Dave.

The trunk automatic opener has a been a pain for a while.

Specifically, the pump kept losing fluid and I thought the reservoir O-ring was the problem. I topped it up a few times, always a little hesitant as the tabs on the reservoir seemed like the should break after a few times. Seems like the real problem was elsewhere,

The cost of the Cu washers is not the issue, the issue is that I think dealer will only want to sell the complete system for a grand or so ? Anyway, I will just try tightening the existing one a a little and see what happens.
 

W220 Moderator
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The cost of the Cu washers is not the issue, the issue is that I think dealer will only want to sell the complete system for a grand or so ?
I have just looked this up on Mercedes EPC, and you are quite correct, MB only list the whole Pump, Pipes and Ram Assy ...........

WTF :confused:

That beggars belief :rolleyes:

Hopefully nipping it will cure it, if not here is a few more options..........

Try and find a local friendly Mobile Hydraulic Hose Man with Van, the kind who go out on construction sites fixing Diggers etc on site........Let him have a look at it and he'll likely have the right sealing washer :wink

Go to "Harbour Freight" , "Walmart" or similar, and buy an assorted box or 2 of Copper Washers and Dowty Seals, and then hopefully there will be one in there suitable, I keep these "Assortments" in my workshop, if u were nearer I'd give you a few :wink

Take the washer off, and go to a Hydraulic Shop and they will likely have one :wink

HTH,

Cheers Dave
 

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Discussion Starter #5
Thanks Dave.

So far, your first suggestion of tightening the washer seems to have fixed the problem.
...cheapest and easiest. Lets see if it lasts.

I guess the good thing is that the pum has nice fresh fluid now.
 

W220 Moderator
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So far, your first suggestion of tightening the washer seems to have fixed the problem.
...cheapest and easiest. Lets see if it lasts.
Hi,

Excellent news, yeah that should be fine now :wink

Thank you for taking the time to report the outcome, this really does help others when they are searching for info :wink

Cheers Dave
 
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