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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 05-15-2012, 04:21 PM
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Captain Roundel Captain Roundel is offline
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Z3 Hydraulic top oil tank looks empty.

I checked the oil tank and it looks empty. I hope this is an easy DIY. Did a quick search and didnt see much.
Has anyone done this??
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  #2  
Old 05-15-2012, 11:45 PM
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Captain Roundel Captain Roundel is offline
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Anyone???
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  #3  
Old 05-16-2012, 05:07 PM
aldena007 aldena007 is offline
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Mein Auto: 2005 Z4 3.0i
"Hydraulic Tank"

Not sure what you are describing here. If the "tank" is white plastic I can only think of two things which would be the brake fluid reservoir or the windshield washer fluid reservoir. My 2005 Z4 has electrically assisted power steering so I don't have a reservoir for the power steering. If the "tank" is a reservoir of some sort and it is empty now something is going to quit working soon. A little more information would be helpful to get some more specific guidance for the DIY types. If this is a reservoir of the type I mentioned above the Z should be giving some warnings on the instrument cluster.
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  #4  
Old 05-16-2012, 05:12 PM
khammack khammack is offline
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Quote:
Originally Posted by Captain Roundel View Post
I checked the oil tank and it looks empty. I hope this is an easy DIY. Did a quick search and didnt see much.
Has anyone done this??
Yes the top's oil tank can be filled as DYI.
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  #5  
Old 05-17-2012, 05:42 AM
wrench13 wrench13 is offline
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If your convertable top hydraulic motor's oil reserve is empty, there is a reason - called a leak. Better find out where that is before you go adding more, you'll only make the mess where the old fluid went that much bigger. You can disable the hydraulic unit by turning the T handle on the top of the unit, and can then open and close the top manually.
Pull the left trunk carpet up and see if you have a puddle of hydro fluid under it, first place to check. If not there, follow the hyrdo lines and look at the connections and look for cracked or cracking hoses. If nothing there, look around where the hydro cylinder connects to the top. The fluid went somewhere!
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  #6  
Old 05-17-2012, 12:02 PM
aldena007 aldena007 is offline
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Hydraulic Tank

I missed the word top and Z3 on my response. Sorry about that.
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  #7  
Old 05-17-2012, 05:11 PM
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Captain Roundel Captain Roundel is offline
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Thanks, all. I shined a flashlight thru the convertible top reservoir and it looked empty, but, its kind of hard to tell.
I found no puddles of fluid or signs of leakage so I could be wrong. The motor still spins so thats a good sign.
I will try again. If anyone knows the exact procedure to add hydraulic fluid please share.
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  #8  
Old 05-17-2012, 05:49 PM
East Ridge Z East Ridge Z is offline
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Where is this found?
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  #9  
Old 05-17-2012, 06:40 PM
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Captain Roundel Captain Roundel is offline
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Originally Posted by East Ridge Z View Post
Where is this found?
The motor? On a Z3 its the left side of the trunk, behind the carpeting. Not sure about a Z4.
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  #10  
Old 02-18-2013, 12:22 PM
Floridafun Floridafun is offline
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where is the resivior?
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  #11  
Old 02-18-2013, 12:26 PM
Floridafun Floridafun is offline
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what kind of fluid does it take?
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  #12  
Old 08-03-2014, 04:52 PM
HidyHarve HidyHarve is offline
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Question Adding convertible top hydraulic fluid

My 99 Z3 has 112k miles and I have owned it since it was 2 yrs old. Never heard of needing hydraulic fluid, but it has become unable to raise or lower top without physical help. After reading this post, I looked and saw that there is only a tiny amount of fluid in the reservoir. But I don't see where you add fluid, nor do I know what kind of fluid I should use. Any help on how to add fluid greatly appreciated. Do you have to move the motor to add fluid?
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  #13  
Old 08-03-2014, 05:02 PM
AB1945 AB1945 is offline
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Last edited by AB1945; 08-03-2014 at 05:03 PM.
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  #14  
Old 08-03-2014, 06:34 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 HidyHarve View Post
... unable to raise or lower top without physical help... there is only a tiny amount of fluid in the reservoir... Any help on how to add fluid greatly appreciated. Do you have to move the motor to add fluid?
See Step 23a at http://www.tophydraulicsinc.com/bmwz3removalguide.pdf
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