35i roof self closing

Specific discussion about the E89 2009 Z4 (sDrive35is, sDrive35i, sDrive30i, sDrive23i)
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uz4
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35i roof self closing

Post by uz4 » Mon Apr 19, 2021 11:01 pm

I needed to check rear light cluster and opened convertible roof half way to allow access into boot. The rear part (boot lid) was in vertical position but after a few minutes it started to close by itself. Obviously some hydraulic or gas strut system has malfunctioned. What should I be worried about and how serious a problem?
Thanks for any advice.

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Chippie
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35i roof self closing

Post by Chippie » Tue Apr 20, 2021 7:11 am

I take it you turned the engine off?
If so then that’s normal as without the engine running the hydraulic pump will loose pressure and the roof will lower on it’s own.
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uz4
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35i roof self closing

Post by uz4 » Tue Apr 20, 2021 10:58 am

Ok thanks for that. No panic then. Had such a dread there was a major issue and potentially costing megabucks to fix.

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Timmyboybunter
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35i roof self closing

Post by Timmyboybunter » Tue Apr 20, 2021 1:48 pm

I'm sure there's no problem here, but it sounds like 2 different bits of the car being discussed.

OP mentions the 'boot lid' closing from vertical after a few minutes - mine doesn't do that, it stays vertical.

Agree with Chippie though, the other 2 sections of the roof (which lift and fold into the boot) will only hold their position in the air for a couple of minutes before they gently lower (which is a pain when you're trying to clean windows or lubricate mechanism parts!)
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35i roof self closing

Post by mcbutler » Wed Apr 21, 2021 7:16 am

Chippie wrote: Tue Apr 20, 2021 7:11 am I take it you turned the engine off?
If so then that’s normal as without the engine running the hydraulic pump will loose pressure and the roof will lower on it’s own.
Not so sure about that Chippie, I have often had my roof in the same position the OP mentions and it does not drop, you cant move it by hand either!
Hydraulic pressure in a system does not generally drop once the pump stops. For example if you raise the arm of a JCB, turn off the engine and park it the arm does not drop.....
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35i roof self closing

Post by acm » Wed Apr 21, 2021 9:16 am

Hi,

See E89 2013 Putting roof in service position - the key (sic) is to remove the key from the igntion :D

Although, on the newtis instructions it does say prop up the boot lid with something suitable when working on the Z4 with the boot in the upright position. Probably out of an abundance of caution from BMW :o

Cheers!
Andy

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Timmyboybunter
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35i roof self closing

Post by Timmyboybunter » Wed Apr 21, 2021 9:19 am

Good shout - wish I knew about removing the key when I lubed mine up last year, was a right pain :thumbsup:
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35i roof self closing

Post by flybobbie » Wed Apr 21, 2021 7:18 pm

Boot always settles back down. Just make sure the roof bit is fully up or down. It tends to stay put longer than boot if half way.

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35i roof self closing

Post by JimP » Fri Apr 23, 2021 3:20 pm

Timmyboybunter wrote: Wed Apr 21, 2021 9:19 am Good shout - wish I knew about removing the key when I lubed mine up last year, was a right pain :thumbsup:
I had thought about lubricating the roof mechanism. Is it necessary, and if so, is there a guide to doing it? Jim

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35i roof self closing

Post by Jay-Jay » Fri Apr 23, 2021 4:01 pm

JimP wrote: Fri Apr 23, 2021 3:20 pm
I had thought about lubricating the roof mechanism. Is it necessary, and if so, is there a guide to doing it? Jim
[/quote]

Hey Jim, I'm looking to do this too on mine, I found a really good youtube video: https://youtu.be/cWltc7C4VVc

But from reading other posts the grease is not needed or not as much, Im still trying to work that out, I was looking to purchase some Wd40 White Lithuim grease
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35i roof self closing

Post by RobbiZ4 » Fri Apr 23, 2021 4:06 pm

JimP wrote: Fri Apr 23, 2021 3:20 pm
Timmyboybunter wrote: Wed Apr 21, 2021 9:19 am Good shout - wish I knew about removing the key when I lubed mine up last year, was a right pain :thumbsup:
I had thought about lubricating the roof mechanism. Is it necessary, and if so, is there a guide to doing it? Jim
Oh no, no, no. Drop that video, it's nonsense.

Have a look at this explanation:
viewtopic.php?p=1829490#p1829490
Last edited by RobbiZ4 on Fri Apr 23, 2021 4:10 pm, edited 1 time in total.
:spy: :ant:
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048

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35i roof self closing

Post by RobbiZ4 » Fri Apr 23, 2021 4:08 pm

acm wrote: Wed Apr 21, 2021 9:16 am See E89 2013 Putting roof in service position - the key (sic) is to remove the key from the ignition :D
That is correct.
When the solenoids in the hydraulic pump are shut down, the pressure lowers in the rear roof shell. There is a different behaviour on all 3 hydraulic circuits. If a hydraulic pump with 4 solenoids is mounted, the behaviour differs once again. :rofl:
:spy: :ant:
Y3 Roof Diagnostic System
viewtopic.php?f=23&t=129048

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