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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 01-20-2010, 10:55 AM
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Mein Auto: S54 M Coupe x2, M52 Z3
Z3: Power steering leaks...

So I assume the hoses are shot on the power steering for the Z. I have ordered all new ones to fix the problem.

However, there seems to be another issue. There is a weep hole in the cap of the power steering reservoir and I think thats letting fluid out. I looked at the coupe and its the same reservoir (checked part number) and it too is caked with grime that I assume is from the PS reservoir leaking. (hoses are clean on the S54 though)

So is there a fix or idea to keep the PS reservoir from weeping fluid out of the cap? Or do I just need a new cap or something?

I am running Mobile 1 Synthetic ATF in the PS systems.

There was discussion on this years ago, but no resolution.

http://www.bimmerfest.com/forums/sho...cap#post482130
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Last edited by Mpire; 01-20-2010 at 11:02 AM.
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  #2  
Old 01-20-2010, 11:05 AM
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What about drilling and tapping the top after sealing the leak? I could run a flexible hose to a small vent of come kind. Give it more room to breathe?

I found an air filter for a nitro remote controlled car...



Getting ideas.... Maybe they make a miniature catch can. Hmmmm.
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Last edited by Mpire; 01-20-2010 at 11:25 AM.
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  #3  
Old 01-20-2010, 03:48 PM
khammack khammack is offline
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I think the leaking is an indication of another issue. As I understand it, the hole is to allow fluid out when necessary. Has it been over filled? There can also be mechanical issues that would cause it to leak, but don't ask me what they are. I took mine to the dealer and they replaced the PS unit under warrantee.
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  #4  
Old 01-20-2010, 07:24 PM
ZZZING ZZZING is offline
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Check the clamps on the power steering hoses

The clamps are notorious for causing leaks, try to clean up the hoses and see if it still is leaking. I had a mouse eat into mine a few years back, guess he liked the flavor. Mine was recently leaking again, but tightening the clamps solved that issue.
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  #5  
Old 01-20-2010, 08:02 PM
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Mein Auto: S54 M Coupe x2, M52 Z3
I am thinking of making a minuture catch can.

I ordered new hoses, reservoir, and will just replace the whole shooting match and see if that helps.

The top of the reservoir is wet, thats the problem. Not over-filled I don't think. However there is no baffle on the cap, so it would be easy for fluid to come out with my driving style.
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Last edited by Mpire; 01-21-2010 at 11:12 AM.
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  #6  
Old 01-21-2010, 11:14 AM
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I ordered a few of these aluminum bottles to see about making a miniature catch can for the power steering cap.

I know its overkill, but you guys know I can't help it.

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  #7  
Old 02-16-2016, 03:38 PM
Seasidegolfer Seasidegolfer is offline
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Mein Auto: 1998 z3 BMW
Quote:
Originally Posted by Mpire View Post
I am thinking of making a minuture catch can.

I ordered new hoses, reservoir, and will just replace the whole shooting match and see if that helps.

The top of the reservoir is wet, thats the problem. Not over-filled I don't think. However there is no baffle on the cap, so it would be easy for fluid to come out with my driving style.
When I bought my '98 the ppi revealed a minor wetness on the p/s hose coming from the reservoir. When I took it in to have the cooling system rebuilt the shop inspected the p/s system and found no issues but did say the fluid can leak out of the cap and flow down that hose. They said it's very common and that at races, owners are asked to put a rag under the cap ( I understood it is stretched across the opening and the cap screwed Dow on top of the rag) to absorb fluid that can otherwise escape and make it onto the track. The shop is a performance BMW shop and seems to know these cars inside and out. So, I think you are onto something with the idea fluid may be escaping from the cap and now you may have an easier fix than building a catch can. May be more effective as well since it seems the fluid may be escaping around the seal of the cap and not out of the hole you describe or maybe both. Either way, the rag would catch the fluid before it escapes.
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  #8  
Old 02-16-2016, 06:02 PM
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vintage42 vintage42 is offline
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Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Seasidegolfer View Post
... the shop inspected the p/s system and found no issues but did say the fluid can leak out of the cap and flow down that hose...
I replaced the cap's rubber gasket.
https://www.ecstuning.com/BMW-Z3-1.9-M44_1.9L/ES54447/
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