From digest.v7.n1276 Tue Mar 10 15:13:42 1998
From: Phil Marx <BMW_at_rlc.net>
Date: Tue, 10 Mar 1998 12:40:08 -0500
Subject: <E28> power seat maintenance/repair
As atonement for accidently sending something appearing to be a commercial
post to the list (I actually intended to respond to someone's quest for an
E34 5sp and managed to respond to the list using his address as the subject
so he probably didn't get it anyway) I offer this tid-bit:
If the seat back on your E28 power seat (old 7/6er also) is loose, before
it gets worse, take off the lower hinge-cover plastic (one phillips screw)
but be careful as the cover may be all that's holding your seat recliner
transmission together. You'll see the transmission held together and to
the seat by four slotted screws, tighten these, if they're still there.
Remove the upper plastic hinge cover (one phillips screw and pull to
release the snap) and tighten the huge phillips head bolts which attach the
hinge to the seat back. I use my hand impact with the largest phillips
bit. If you have arm rests, try undoing the upper cover and swinging it
out of the way to avoid removing the armrest. To access the inside
(armrest side) covers you may need to unbolt the seat from the floor.
These items were so loose on a recent '86 E28 trade that the seat back was
crooked as one transmission case had come apart and the drive wasn't
operating on that side. While you're there you might as well pull the
seat-back off and fix the headrest drive cable with the hanger/welding rod
trick to shove the drive back up the cable housing. 4mm of rod is usually
If you've got sport seats (535is, M5, 6er) then the drive mechanisms are
much larger boxes with two drive gears but are held on with only two
phillips head screws which are also usually about to fall out. On these
seats the backrests are attached to the hinge mechanism with phillips bolts
which require seat back removal to access. They are also notoriously loose.
Tightening up these two spots, 4 per seat, makes a world of difference on a
older car. Just call it a "butt-dyno" tune-up. I'm so impressed I may
even check out the bolts on my wife's e28 w/ 215,000 miles. Just consider
it normal maintenance mid-way through the life of an E28.
[ Help ]
- -Phil Marx BMWCCA #6021
Bavarian Motor Warehouse, Inc.