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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 02-11-2012, 03:06 PM
AceFX AceFX is offline
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Cool How to fix your Trunk lid when it doesn't open properly or stay open!

Ace here with another video for your viewing pleasure.

I like many have had a problem with the Hydraulic System on the Trunk lid. I didn't have oil leaks so I tried program resets, adjusting the movement sensor etc....and my problem never resolved.

Some days when I would open my trunk, it would only lift about an inch, I would hear the motor run forever, then it would time out and drop back down. Other times it would open halfway, and then fall back down. Sometimes I got lucky and it would open nearly all the way, but then fall back down. The trunk lid would never go all the way up.

In my case, the fault turned out to be the Gas Struts. The new BMW revised Gas Struts cost me $80 each.

BMW did revise the Hydraulic Lines to solve the leak problems. You can tell if you have the revised lines quite easily, they are Black wih Yellow writing. If you do not have these you do not have the revised Hydraulic Lines.

Also they revised the Gas Struts. When you watch the videos you wil see the difference between the old Gas Strut and the new revised Gas Struts.

When you see the old Gas Struts with the Black Spring beside the new Gas Struts with the Silver Springs, you will see how much larger the Silver Spring is and how it has many more windings than the old Black Spring.

The new part numbers for the Gas Struts are (RHS)51247201461 and (LHS)51247201462.

In one of the videos I demonstrate how after only replacing one of the Gas Struts, the Trunk Lid operation is normal, and then another video showing after installing both new Gas Struts the Trunk lid opens without the assistance of the Hydraulic Ram.

Now enjoy the video show

Video 1....

In this video I demonstrate how to replace the Gas Struts that operate the trunk lid. It was a very common problem for BMW E65 E66 to have a problem with not opening properly or falling back down after opening. I experienced both problems. The Gas Struts have been revised twice in order to solve this problem. I am fitting the final Gas Strut revision models made available in Sept 2007. You will notice that they have a larger diameter coil on the spring and more windings of the spring.

......

Last edited by AceFX; 02-11-2012 at 04:57 PM.
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  #2  
Old 02-11-2012, 03:12 PM
AceFX AceFX is offline
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In this video I demonstrate how I have removed the first Gas Strut from the right hand side. The difference between the two Gas Struts is quite apparent. You can see how much larger and how there are more turns in the spring body itself.
Previous part number for the RHS is 51247042104.
New part number for the RHS is 51247201461.
Previous part number for the LHS is 51247058646.
New part number for the LHS is 51247201462.

......

Last edited by AceFX; 02-15-2012 at 02:59 AM.
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  #3  
Old 02-11-2012, 03:13 PM
AceFX AceFX is offline
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In this video I demonstrate how well the trunk lid now operates with only the first (RHS) Gas Strut replaced.

......

Last edited by AceFX; 02-11-2012 at 04:52 PM.
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  #4  
Old 02-11-2012, 03:14 PM
AceFX AceFX is offline
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In this video I demonstrate re-assembly of the RHS after fitting the RHS Gas Strut.

......
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  #5  
Old 02-11-2012, 03:15 PM
AceFX AceFX is offline
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In this video I show the removal of the TCU unit and the bracket that holds it in place. Once these two items are removed, you will see that I have clear access to the LHS Gas Strut. I also show how there is only one Hydraulic Pump and there is only one Hydraulic Ram that operates the Trunk Lid.

......
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  #6  
Old 02-11-2012, 03:16 PM
AceFX AceFX is offline
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In this Video I demonstrate how the Hydraulic Ram is connected to the rear of the LHS Gas Strut. I demonstrate how to undo and remove the Hydraulic Ram.

......
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  #7  
Old 02-11-2012, 03:17 PM
AceFX AceFX is offline
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This video shows the part number change. Also pay attention too and note the difference of the new silver spring on the new Gas Strut compared to the old Gas Strut with the black spring. The newer revised version from BMW, the silver spring, is much thicker and has more turns per inch as compared to the old black spring. These original black Gas Struts were a common fault in the E65 E66 trunks.

......
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  #8  
Old 02-11-2012, 03:18 PM
AceFX AceFX is offline
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In this video I demonstrate how well the trunk lid now operates (without the hydraulic ram connected) now that the new Gas Struts have been installed.

......
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  #9  
Old 02-11-2012, 03:18 PM
AceFX AceFX is offline
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This is the final video showing how well the trunk now works with the new revised Gas Struts from BMW and with the Hydraulic Ram refitted. With the new Gas Struts fitted, the trunk lid opens up quickly now and the Hydraulic Pump turns off straight away. Also now when the Trunk lid is closing, it comes down gently now, whereas before it would drop quite rapidly.

......

Last edited by AceFX; 02-13-2012 at 08:01 PM.
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  #10  
Old 02-11-2012, 04:34 PM
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Good work as usual....thanks for sharing
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  #11  
Old 02-11-2012, 08:13 PM
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Wow thanks for putting your time and effort into these videos! This has been something on my to do list for awhile and this should help me out motivationally and technically! I think I'm gonna try changing just one of them for now and hopefully it will make a difference until I feel like spending $ on the other shock
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  #12  
Old 02-11-2012, 08:45 PM
DrAsTiC DrAsTiC is offline
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Great videos I have been having the same problem and now I am going to fix it .
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  #13  
Old 02-12-2012, 01:40 AM
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Wonderful work on the video n help thanks bro
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  #14  
Old 02-12-2012, 02:09 AM
AceFX AceFX is offline
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I am glad if I am helping people.....
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  #15  
Old 02-12-2012, 04:40 AM
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Quote:
Originally Posted by AceFX View Post
I am glad if I am helping people.....
Replace "if" with "that"
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  #16  
Old 02-12-2012, 06:46 AM
Hamilton1974 Hamilton1974 is offline
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Thanks a bunch for that DIY!! My lid stays up if the car is parked on level ground. But if the nose is up just a little bit the lid will fall down so this is definitely something I'll add to the already long To-Do list!
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  #17  
Old 02-12-2012, 09:54 AM
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My issue is a little different and I wonder if this will fix it.....When I press the trunk button, the trunk rises about a half inch and then closes again. However, if I just give it a nudge with my hand as I click the button, it rises on it's own all the way and stays up. It closes fine as wel.
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  #18  
Old 02-12-2012, 09:56 AM
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Oh, also.....

ACE, where did you get the parts? Dealer?
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  #19  
Old 02-12-2012, 01:35 PM
AceFX AceFX is offline
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Quote:
Some days when I would open my trunk, it would only lift about an inch, I would hear the motor run forever, then it would time out and drop back down. Other times it would open halfway, and then fall back down. Sometimes I got lucky and it would open nearly all the way, but then fall back down. The trunk lid would never go all the way up.
As I wrote at the start of the post, I had that same problem, and I would give it a nudge to assist it lifting up. It depended on the day, or temperature how it worked. When it was cold was when it was at it's worst and hot weather it seemed to work OK, but ONLY just.

The solution for me, by replacing the Gas Struts, which is a known documented problem, that's why BMW made these revised Gas Struts and you can see how much different they are, they are not just a new Gas Strut, the springs are physically different, my trunk is now perfect.

Gas Struts came from a BMW Dealer, I wouldn't know if aftermarket ones come with the much larger spring as the revised genuine BMW's do.

Last edited by AceFX; 02-12-2012 at 01:37 PM.
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  #20  
Old 03-30-2012, 12:56 AM
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Quote:
Originally Posted by AceFX View Post
Ace here with another video for your viewing pleasure.

I like many have had a problem with the Hydraulic System on the Trunk lid. I didn't have oil leaks so I tried program resets, adjusting the movement sensor etc....and my problem never resolved.

Some days when I would open my trunk, it would only lift about an inch, I would hear the motor run forever, then it would time out and drop back down. Other times it would open halfway, and then fall back down. Sometimes I got lucky and it would open nearly all the way, but then fall back down. The trunk lid would never go all the way up.

In my case, the fault turned out to be the Gas Struts. The new BMW revised Gas Struts cost me $80 each.

BMW did revise the Hydraulic Lines to solve the leak problems. You can tell if you have the revised lines quite easily, they are Black wih Yellow writing. If you do not have these you do not have the revised Hydraulic Lines.

Also they revised the Gas Struts. When you watch the videos you wil see the difference between the old Gas Strut and the new revised Gas Struts.

When you see the old Gas Struts with the Black Spring beside the new Gas Struts with the Silver Springs, you will see how much larger the Silver Spring is and how it has many more windings than the old Black Spring.

The new part numbers for the Gas Struts are (RHS)51247201461 and (LHS)51247201462.

In one of the videos I demonstrate how after only replacing one of the Gas Struts, the Trunk Lid operation is normal, and then another video showing after installing both new Gas Struts the Trunk lid opens without the assistance of the Hydraulic Ram.

Now enjoy the video show

Video 1....

In this video I demonstrate how to replace the Gas Struts that operate the trunk lid. It was a very common problem for BMW E65 E66 to have a problem with not opening properly or falling back down after opening. I experienced both problems. The Gas Struts have been revised twice in order to solve this problem. I am fitting the final Gas Strut revision models made available in Sept 2007. You will notice that they have a larger diameter coil on the spring and more windings of the spring.

......
Trunk has the revised gas struts but wont open when the trunk button is pressed as you can see in the video Any other solutions?
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  #21  
Old 03-30-2012, 01:03 AM
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Bro, just wondering did u check the fluid in the trunk pump cause I have a leak on my cylinder n im leaking fluid so its low. So I was wondering, if U have the same thing is there any leaks?
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  #22  
Old 03-30-2012, 01:07 AM
djdecko djdecko is offline
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Originally Posted by B7M4W5 View Post
Bro, just wondering did u check the fluid in the trunk pump cause I have a leak on my cylinder n im leaking fluid so its low. So I was wondering, if U have the same thing is there any leaks?
Yeah, that was the first thing I looked for. The fluid cylinder was about 50 - 75% full and no signs of a leak.
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  #23  
Old 03-30-2012, 06:08 AM
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Thanks for the info Ace!!!
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  #24  
Old 03-30-2012, 10:25 AM
mikewerks mikewerks is offline
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Thanks Ace replaced mine last week and works great. There were some good pointers in your demo that came in handy.
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  #25  
Old 03-30-2012, 11:40 AM
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Awesome write up bro! I gonna have to replace mine as well. Were you able to find out anything about the light problem I asked you about?
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