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Seat Looseness

43015 Views 107 Replies 37 Participants Last post by  rorz12
I couldn't find the original thread on this subject, so forgive me for starting over. (Maybe it was the other forum.) I finally got around to looking under the seat and this is the letter I wrote to BMW. I'll let you know if and when I here back.

There's a second issue I didn't mention, but I didn't want to muddy the waters. I also found that the thigh support can move a little if it's positioned anywhere other than full in.


Letter:

I would like to bring to your attention an issue with the 6 Series front seats that seems to be common amongst many owners based on the forums that I read.

Simply put the front seats have a looseness that allows movement under load when the car is cornering. It does not take much lateral input to generate movement.

I have investigated this problem to isolate the cause. I am an engineer with 30 years automotive experience, so please take my analysis seriously and forward it to the appropriate personnel.

There is a cross-car steel support tube that passes through two (I assume urethane) bushings under the forward edge of the seat frame. This assembly is part of the mechanism used to raise and lower the front edge of the seat cushion. The bushings, attached to the seat cushion pan, are oblong in relation to the diameter of the tube to allow longitudinal movement as the mechanism is raised and lowered. Lateral movement is controlled by flared "stop" features on the steel tube on either side of the outside (driver) bushing. It is the relationship between the sides of this bushing and these stop features that is problematic.

If the front seat edge is adjusted to any position other than full stop (high or low), which places the tube firmly against the bushing, lateral movement can occur between the sides of the bushing and the flares on the tube. This motion is easily felt by the seat occupant as the bushing (and seat) bounce back and forth between the two stops on the tube. Hardly acceptable on this class of automobile.

Many 6 Series owners have taken their cars to the dealership with no resolution. A permanent solution needs to be driven from the top down. It seems a simple solution would be a wider, harder lubricious bushing to prevent the unwanted lateral movement without binding the adjustment mechanism. But I will leave that analysis the the BMW engineering staff.

Thank you for your attention to this important matter. I look forward to a solution and positive response.

Feel free to contact me at any time to discuss this further.

Best regards,
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Take Vaseline as well.
I honestly don't think it would help.
650 seat repair

I likewise have developed a loose driver seat. Dealer indicated it could be frame related and in excess of 4K to repair. I expended the seat all the way down and the looseness disappeared. Would that indicate the frame is ok and only the bushings need replacement. Thanks
Hi all. I posted this over at F06 as well, since I have an F06, but sorry for being the annoying guy who posts in multiple places, but wanted to reach most of you as possible. Reviving this thread because I have the dreaded loose seat, which is starting to really bug me when cornering. Of course, out of warranty and no way going to spend money on a new seat frame or pan.

I previously tried the lubricant method by spraying WD-40 into the bushings and it helped (by silencing but not stopping the movement) in the beginning, but it's back after a few months.

Took a video last night of the problem. Someone suggested wedging an L bracket between the bushing and the flared part of the rod to stop the movement, I wonder if anyone else has had and fixed this issue? Do they sell new bushings somewhere?

And for the people here that used grease, did it ever come back after a few months?

Hey RORZ, I posted a fix 2 yrs ago, maybe you missed it. It’s been 2 yrs and NO thump when I turn corners. The only compromise is I do heard a click when adjusting the seat, like giving rear seat passengers access to get on. It isn’t a problem because I am the only driver and the seat stays in one position most all the time. Here’s the link to my post, complete with pictures. Good luck!
Thanks! I hadn't come across your post so thanks for sharing. As a matter of fact, I was thinking of doing the exact same thing with zip ties! I was thinking of placing them in the groove itself, wedged between the bushing and the flared part of the rod, but maybe there isn't enough space realistically. I'd really prefer not taking the seat out so hopefully I can slot those zip ties in with the seat still bolted?!
Hey RORZ, I posted a fix 2 yrs ago, maybe you missed it. It’s been 2 yrs and NO thump when I turn corners. The only compromise is I do heard a click when adjusting the seat, like giving rear seat passengers access to get on. It isn’t a problem because I am the only driver and the seat stays in one position most all the time. Here’s the link to my post, complete with pictures. Good luck!
The seat isn’t that hard to remove. It is heavy, but I did it alone and I’m an old fart ( 70 at the time). An assistant would make it easier. Good luck
Thanks! I hadn't come across your post so thanks for sharing. As a matter of fact, I was thinking of doing the exact same thing with zip ties! I was thinking of placing them in the groove itself, wedged between the bushing and the flared part of the rod, but maybe there isn't enough space realistically. I'd really prefer not taking the seat out so hopefully I can slot those zip ties in with the seat still bolted?!
I'm not worried that it's difficult, but just I'd rather not since I don't have my own garage, just basement parking in the building. Plus less head ache. Anyway I will see how it goes !
The seat isn’t that hard to remove. It is heavy, but I did it alone and I’m an old fart ( 70 at the time). An assistant would make it easier. Good luck
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