BMW e24/28 Powered Sport Seat hinge pair Refurbished

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Location: Huntington Beach, California, United States
Ships to: US,
Item: 256427272939

eBay e24/e28 Seat hinge repair: I used to chuckle at the creativity in some people. Seeing old 6s with boxes placed behind the seat back or the passenger and driver seats switched would make me laugh. Over the course of 35 years in this business I have replaced my share of seats and frames on e24s both new and used. BMW unfortunately discontinued the replacement frame part #52101934547 years ago and the hinges were never offered separately. This Recaro made seat was used in Powered Sport optioned e28s and e24s only. In the US M5s & M6s it was standard equip. The e24 has additional pull cables for the latch operation that allows the seat to fold forward for rear seat access. Other than this the seat frame is identical on both. Over the years I have seen a few of these seats installed in e24s fail. The primary culprit is the geared seat back arm(see pic below). Since this failure seems to mostly occur to e24s I suspect the cause is related to the fold feature and specifically the way the seat is returned to upright from the folded position. When the strut that is intended to assist folding and slow the return to upright wears out the seat can fall back quite hard. I can attest to letting a seat or two flop back to upright, it’s just not something I had thought would be an issue, until examining the after affects. When the seat is in the upright lock all of the seat backrest weight including the passenger, is focused on the 2 steel arm’s geared teeth for the backrest. These teeth were designed to handle this weight, however when the backrest is allowed to be slammed back up from the folded position there is a lot of momentary force to the one tooth the gear is engaged. Often, if the seat has been worked on, (and lets face it they have all been worked on), miss-alignment of the seat frame can put almost all of that force on just one tooth! This shock load leads to a fracture that starts at the leading corner (pic below) of the base of the tooth and will eventually lead to shearing off of the tooth. Left this way or electrically operated, more teeth will become damaged leading to damage to the gear box or the hardened bushing that supports the drive gear(often broken or missing(pic). Additionally, the repeated slamming of the seat back into position will lead to looseness, this is due to the thin metal capturing the lock pin becoming mushroomed(pic). The hinge is assembled via steel rivets and steel pins that have been pressed into position and capture the sheet steel plates and arms between them. This assembly was not intended to be serviced however, having no other options I studied the design and disassembled one for investigation. I found I could effectively disassemble it and with some help from my daughter we had a CAD representation of the damaged arm. I thought about improving the damaged part design like adding some thickness. Unfortunately, there is no room in the hinge so this can’t be done. The new gear arms do have radiuses to the inside of the gears that should improve strength of each tooth. I had some made and I reassembled it into a hinge. With our first try, we had a success! I have installed the repaired hinges into my e24 and tested them extensively. With new a strut the seat operates great has less play and seems to adjust more smoothly than most I have operated. After disassembly I clean all parts, disassemble the hinge, remove the satin black paint, flatten out the mushroomed steel, and repaint everything with satin black Steel-it Polyurethane. I install the new arm and weld the hinge back together, install a new, slightly stronger strut, I coat the gears and hinge points with grease. Installed and operated properly, and with good gear boxes, the seat hinges should last a good long time. I can provide replacement service if you are local to SoCal. ***NOTE*** Your damaged hinges will be required for core exchange. If rebuildable you will receive a full refund of your core value of $500. I have some spare parts so some damage (example missing bushings or under plate damage will result in a partial core refund. If you are uncomfortable with an unknown charge feel free to contact me, and send pictures of your hinges and gearboxes for evaluation. Ron I. Coast Motor Werk

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