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Car Forum / BMW Cars / April 2006

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e36 power seat backrest gear

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mcquarrie - 17 Apr 2006 03:27 GMT
Power seat backrest not working on '98 M3. Motor runs but backrest does
not move.

Other forums tell of broken nylon gear (either on motor shaft, or
gearbox).

Is that a replaceable part?
Jeff Strickland - 18 Apr 2006 02:21 GMT
> Power seat backrest not working on '98 M3. Motor runs but backrest does
> not move.
[quoted text clipped - 3 lines]
>
> Is that a replaceable part?

Let us (me) know when you find out, mine is doing the same thing.
Pedro - 18 Apr 2006 14:11 GMT
The gear is replaceable.

Go to www.odometergears.com and buy them from Jeff and while you're at
it, i advise for you to buy both gears (recline and seat gear).

Pedro

> > Power seat backrest not working on '98 M3. Motor runs but backrest does
> > not move.
[quoted text clipped - 5 lines]
>
> Let us (me) know when you find out, mine is doing the same thing.
mcquarrie - 19 Apr 2006 05:12 GMT
Thanks for the link - great website.

How much would a BMW dealership charge to fix this problem?
mcquarrie - 19 Apr 2006 14:26 GMT
...also, what special car is required when handling the pyrotechnic
seat belt tensioners? Just disconnecting the battery...
Pedro - 19 Apr 2006 15:53 GMT
BMW actualy does not sell the gear itself... you have to buy the seat
frame that cost hundreds of dollars so do not expect to find a bmw part
n# for it.

> The gear is replaceable.
>
[quoted text clipped - 12 lines]
> >
> > Let us (me) know when you find out, mine is doing the same thing.
mcquarrie - 20 Apr 2006 04:34 GMT
yes I enquired today -  $400+ for the bottom seat frame. Yeah, right.
mcquarrie - 25 Apr 2006 17:28 GMT
Gears arrived today. $80 seems like a lot for 2 tiny pieces of plastic
- but it's a lot less than $400.
I will probably do the job this weekend.

Has anyone else bought these gears from odometergears.com? Have they
worked OK?
Pedro - 26 Apr 2006 16:16 GMT
> Gears arrived today. $80 seems like a lot for 2 tiny pieces of plastic
> - but it's a lot less than $400.
> I will probably do the job this weekend.
>
> Has anyone else bought these gears from odometergears.com? Have they
> worked OK?

you'll be suprise to find out how easy it is to install the new gear...
it slides in the piece where the old one used to be and it only take a
couple of minutes to do the job.
mcquarrie - 26 Apr 2006 18:20 GMT
I agree the whole task was fairly easy but I think "a couple of
minutes" is an understatement - unless you are speaking only about the
act of removing the broken gear and installing the new one.

I did it last night and it took about 2.5 hours from start to finish.

some advice for others - the following tools helped me
1/4" hex-drive Torx bits T27, T25, T20
1/4" drive socket for 1/4" hex nut (to drive the Torx bits)
1/8" and 7/64" allen wrenches
soft blow hammer
needle nose pliers
8mm open ended wrench
16mm hex nut socket

when you get the gearbox open, look out for a small circular clip. It
fits on the end of shaft after you install the new gear - mine had come
loose and was buried in the grease.

When disconnecting the seat wiring, there are 2 identical black
connectors which could be incorrectly swapped- note the correct
positions. All the other connectors are unique.
KMS - Brett Anderson - 29 Apr 2006 18:48 GMT
The black connectors that are identical are interchangeable.  They are for
the seat heater elements, and it doesn't matter which one gets plugged into
which.

FYI.

Brett Anderson
KMS - Koala Motorsport
www.bmw-stuff.com

> I agree the whole task was fairly easy but I think "a couple of
> minutes" is an understatement - unless you are speaking only about the
[quoted text clipped - 18 lines]
> connectors which could be incorrectly swapped- note the correct
> positions. All the other connectors are unique.
mcquarrie - 29 Apr 2006 21:35 GMT
Thanks. I thought it strange that the geniuses at BMW would allow me to
screw up. How could I have doubted them so?

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