Cracked sport seat hinge gearbox - first prototype ready

E28 technical advice asked and given! Troubleshooting, modifications and more.
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

Thanks for all the good feedback. I'm glad stuff like this is appreciated!
Only because of the interest and amount of parts that we got it was possible to produce these goodies for a reasonable price.

I'm always up for new solutions on stuff like that.
I'm about to close out on the orders tomorrow, by next week I will have a anodized sample for pictures.

If something similar ever comes to somebody's mind, I can see if we can realize it again.

I will have a couple samples with me at the vintage!
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

All the plates have been sent out two their new owners. Again, I'm sorry for the delay caused by the plating process.
I hope everybody is happy with the outcome. Let me know if you have any issues mounting them.
Thanks again everybody for making this happen, without I would still be sitting sideways in 2 of my seats. :D

Here are the instructions. I tried to cover it in a video, but it didn't work the way I wanted int to. I think the pictures are easier to follow.



Please remember that these are tips from my side, I will not be responsible for any damages caused during the steps of this manual or afterwards.

You need:

17mm
7mm
6mm
4mm
3mm Allen
Flat head screwdriver
Knive
Plenty of rags
Cold Beer

Image

Bring seat in a position where you can easily reach all the bolts.
Remove seat belt.
Remove plastic cover nut (that is missing in all of my cars :( ).
Pull off cover
Image


Remove 4x7mm Hex screws
Carefully pry work your way around the front cover with a small flat head screwdriver, do not lever to hard one one side, or you will break the plate in half

Image
Image
Image
Image

Be careful not to loose any of the 4 plastic guides or the washer setup, take them off the plate, clean and place in their position. The grease will hold them.
The washers go on the worm gears in the bottom. Order: metal, rubber, metal.

Image
Image
Image
Image
Image

Time to Press out the bushings:
Place the 17mm socket under one of the big bushings to support, use a 6mm socket from the top. A couple of gentle hits with a plastic mallet should break them loose.
Repeat for second bushing.

Place the socket below the red plastic bushing in the bottom of the plate. Using a 4mm socket, repeat as before. These usually can be pressed out by hand.

Take the new aluminium covers, place them on a soft surface (rag).
Start with the two big bushings, gently tapping them in with a plastic mallet. Make sure they stay straight. It takes a little bit of force, to get them back in.
Press the two red bushings in by hand.

Image
Image

Time to get the leftover grease of the old plate. The grease should be in great shape, I decide not to replace it. If you do so, please remember to take a grease with a really high drip point. It gets hot in these cars in summer and the last thing you want is grease dripping on your nice carpet.
Place the leftover grease around the seat gears, don’t forget the two little plastic gears in the bottom.

Image

Place the new plate on the gearbox, make sure all the plastic pieces and washers from the beginning are still in place. Make sure you align all the 4 shafts that go into the bushings. Press it onto the shafts by hand. You might not be able to fully seat the front plate. No worries, the bolts will take care of this in the next steps.

Take 4 of the M4 stainless bolts out of the bag, place them in the holes and use a 3mm allen to tighten them down. As usual, don’t tighten one screw down all the way, as the plate needs to be seated. Work your way around the plates a couple of times.
Wipe out the leftover grease out of the busing holes.

Image
Image

Now it’s time to modify the plastic cover, probably the “scariest” step of all. Place the plastic cover on a soft rag.
Take a thin blade and slowly cut your way through the three main “ribs” of the back side. Do this in multiple slow steps, not to break the plastic cover. I modified all 12 of my covers without breaking one.

Place the modified plastic cover over the plate, make sure to align the top threaded bolt with the “guiding rod” on the back of the plate. Tighten down the nut.

Mount the seatbelt back to the seat, make sure to align the little tab with the hole in the seat.
Tigthen the bolt to spec with NM. Remember, the seatbelt is safety critical, you don’t want to realize in a crash that the bolt was not tight to too tight and the seatbelt comes loose.

Repeat 4 more times for the remaining covers.

Open Cold beer and enjoy it in your car seats. ;-)
dan101smith
Posts: 247
Joined: May 16, 2007 9:38 AM
Location: United Kingdom

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by dan101smith »

Having almost rocked myself to sleep on the drive to Le Mans today, please let me know if you're doing another run as I'd like to order. Thanks!
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

I have already arranged getting a second batch made, but we have not timed it yet.
Before we do that I would like to have more feedback of the first round buyers.
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

Since I keep getting requests for these from time to time...

I won't have the time to organize another group sale. :(

If anybody wants to take the lead and organize a larger batch, I can still have these made at a minimum order quantity of 20 plates (10 left, 10 right). Price will be $100 a plate with about 3-4 months lead time.
TroyArboc
Posts: 43
Joined: Jun 08, 2021 10:45 AM
Location: Atlanta, GA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by TroyArboc »

I would be very, very interested (in a few sets) should anyone else take the over and move forward with a group buy.
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

Let's give this a month or two and we see how it goes.
lswoboda
Posts: 95
Joined: Jun 12, 2018 5:22 PM
Location: Maryland

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by lswoboda »

I’d be in for a set (whatever I need for both front seats).

To be clear, this fixes the “rocking” that affects (plagues?) our cars, correct?

Btw, the “how to” by BenGerman is excellent! Very clear and well written. Thank you for all your efforts.

Thanks.
TroyArboc
Posts: 43
Joined: Jun 08, 2021 10:45 AM
Location: Atlanta, GA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by TroyArboc »

Bump
jayjaya29
Posts: 188
Joined: Jul 30, 2014 12:53 AM
Location: Atlanta, GA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by jayjaya29 »

In for 2 sets as well if it happens.
TroyArboc
Posts: 43
Joined: Jun 08, 2021 10:45 AM
Location: Atlanta, GA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by TroyArboc »

jayjaya29 wrote: Jan 27, 2022 1:21 PM In for 2 sets as well if it happens.
Halfway there
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

Might be worth sharing in the Facebook groups and on Bigcoupe?
The E24 has the same issue.
joema
Posts: 31
Joined: Apr 09, 2014 12:51 AM
Location: Lakewood, CA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by joema »

I'm in for a set too, if/when it becomes available.
Badger
Posts: 623
Joined: Feb 12, 2006 12:00 PM
Location: Whately, MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by Badger »

I would be in for a set for both front seats also.
Mike W.
Posts: 26872
Joined: Feb 12, 2006 12:00 PM
Location: California Whine Country

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by Mike W. »

Is the rocking the entire seat assembly or just the back to the seat cushion?
TroyArboc
Posts: 43
Joined: Jun 08, 2021 10:45 AM
Location: Atlanta, GA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by TroyArboc »

Mike W. wrote: Feb 05, 2022 8:11 PM Is the rocking the entire seat assembly or just the back to the seat cushion?
It could be a combination of things but the most common cause is cracked motor casings.
charofire
Posts: 444
Joined: Dec 27, 2008 6:56 PM

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by charofire »

Count me in for a set. Thanks!
elcrazon
Posts: 118
Joined: Feb 12, 2006 12:00 PM
Location: San Diego, CA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by elcrazon »

Interested in two sets, if this happens
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

Alright, let’s do this.

Closing date for orders is 3/15/22. Write me a PN with:

Your Name
Your address
How many left and right pieces you want
lswoboda
Posts: 95
Joined: Jun 12, 2018 5:22 PM
Location: Maryland

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by lswoboda »

Sent PM. Thank you!
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

Anybody else? Haven’t received a PM from everybody that was interested yet.
Chimi-Changa
Posts: 1601
Joined: Nov 08, 2011 11:02 PM
Location: West Bro, MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by Chimi-Changa »

Let me know when you make manual sport seat parts! ( You know how my seats are...) :D


Northeast OH? :laugh:
SharKnows
Posts: 1
Joined: Apr 08, 2018 12:41 AM
Location: Virginia

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by SharKnows »

I would like a set for my drivers seat . Tried sending you a message Ben but I couldn’t get it to work, maybe because I’m in my phone
Badger
Posts: 623
Joined: Feb 12, 2006 12:00 PM
Location: Whately, MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by Badger »

Sent one earlier!
BenGerman
Posts: 740
Joined: Jun 26, 2016 2:19 PM
Location: MA

Re: Cracked sport seat hinge gearbox - first prototype ready

Post by BenGerman »

Got some PMs. Will Follow up in a few days with details.
Post Reply