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BMW M3 Maintenance and Repair

228 messages,  Last post on Nov 05, 2009 at 9:24 PM

You are in the BMW M/M3/M6 Forum. Your Host is claires

What is this discussion about? BMW M3, Coupe, Convertible


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#187 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (7:17 am)
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Replying to: rroscher (Oct 12, 2008 6:59 am)

Sounds like the hydraulic unit might be bad. I believe you can peak at it and look for leaks by removing the left side trim in the trunk. It's under the NAV computer and the radio receiver. If there's no leak I guess you have to bring it in and have it tested.
 
So can you gently urge it upwards with your hand? If it works with hand-assist, I'd say it's probably hydraulic. If it just jams up there, maybe there's a busted arm or bad bushing in the mechanicals.
#188 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (7:28 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 7:17 am)

Thanks! I tried a little more than gentle urge to no avail...It stops at the exact same spot every time, very strange...but it will go back down w/o any trouble. Could not find anything blocking it.
#189 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (7:38 am)
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Replying to: rroscher (Oct 12, 2008 7:28 am)

Okay. Does the motor keep humming or does it abruptly stop?
#190 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (7:49 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 7:38 am)

Keeps humming...
#191 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (8:10 am)
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Replying to: rroscher (Oct 12, 2008 7:49 am)

Okay I'm thinking loss of hydraulic pressure. Just a guess because we don't seem to have a jam (mechanical) and the motor is working (electrical) so by elimination....?
 
You might check for a hydraulic leak, as that could damage the upholstery or paint surfaces back there.
#192 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (8:47 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 8:10 am)

No leaks!
#193 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (9:20 am)
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Replying to: rroscher (Oct 12, 2008 8:47 am)

gotta be the pump. Internal pressure loss?
#194 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (9:32 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 9:20 am)

No pressure loss...Cannot figure this one out!
#195 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (10:12 am)
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Replying to: rroscher (Oct 12, 2008 9:32 am)

I don't know the specs for pressure but I'd imagine from the symptoms you describe that it's an internal leak in the hydraulic pump---since the top works part way and the electrical motor is working, hence top control module sending the right signals.
 
I believe there are trouble codes that can be read on this car to help with diagnosis on the top mechanism.
#196 of 228
E46 M3 Drain Plug by gmonkies
Oct 13, 2008 (9:55 am)
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HI
 
Just need to know what is the right tool to use for the drain plug. The last time/1st time I change the oil, i used a hex key to remove and tighten the drain plug. Since there was no way I can use the torque wrench, I hand tighen the drain plug (using new washer) with the hex key as tight as I can without stripping it. After a couple of months, I saw oil leak from the plug. I realized that the drain plug looks like it can be torqued with a torx set even though the hex key works.
 
Now is time for another oil change, I used the torx to remove it but it started to slip. To prevent any damamge with a stuck drain plug that will require to be tapped out, I decided to leave it alone until I figure out the right tool.
 
If it does use a torx, what size am I suupose to use? It was either T40 or T45 that had the best fit but still slips. Or am I suppose to get a hex key to remove and use a hex key end that can go on my torque wrench to tighten down properly for seal.
 
Thanks!

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