Seat Belt extender motor gear!!! - Page 10 - Mercedes-Benz Forum
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post #91 of 99 (permalink) Old 06-30-2018, 10:11 PM
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Got it @gogi I will work to ship them out one day this week or at the latest it will be next weekend.
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post #92 of 99 (permalink) Old 07-01-2018, 03:09 AM
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Shapeways Gears Note 2018

I put these Shapeways gears in my '91 SEC last year and the presenter works great.

I also used the https://www.k6jrf.com/MB_sbe.html as inspiration.

Its a straightforward job overall

Thanks for doing this Jeff. These and similar efforts add distinct value to our BenzWorld community.

MBL
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91 500SEC EURO Germany
87 560SEC USA 49 State Version
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post #93 of 99 (permalink) Old 07-03-2018, 06:48 AM
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Another set shipped for @gogi I have two more sets left. If you would like a set either Paypal me or PM me if you need a shipping quote. Thanks!
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post #94 of 99 (permalink) Old 07-05-2018, 03:27 PM
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Received my set yesterday, the purchasing process went super smooth, fast shipping and no glitches. @HardwayMB (Jeff) is truly a standup guy!
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post #95 of 99 (permalink) Old 07-07-2018, 05:45 PM
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I shipped the last set this morning from the latest run. I am passing the torch on to the next enthusiast that wants to take this one. If you have any questions please feel free to PM me.
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post #96 of 99 (permalink) Old 07-09-2018, 08:51 AM
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I should have made these! Duh!

I have the presenter covers made in SolidWorks. I just got my 3D printer too. An SLS model.

Current Stable:
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Past cars:
1991-560 SEC AMG - Coupe - 199/261 - 300 HP Custom Built Motor - Highly Modified Coupe.
1990-560 SEL - Sedan - 199/261 - Stock. Euro Headlamps & Wipers
1987 560 SEC Black/Tan
1988 420 SEL Champagne/Brown



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post #97 of 99 (permalink) Old 10-13-2018, 12:07 PM
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Last weekend I got around to installing a set of gears in my driver side extender. Below are some before and after pictures. There are two gears, the smaller fully exposed gear is the drive motor gear and the other is the extender arm push/pull gear. I wanted to replace both even though the motor gear looked good. Once I got everything apart, I could not get the new motor gear to go on the motor shaft. I know the splines were lined up correctly as it would slip almost half way down but stopped. If I pushed on it I could feel the plastic of the gear expanding so I did not force it as I did not want to break it. Since the original motor gear was in excellent shape, I re-installed it. Getting the large C-clip back on the gear requires you to remove the back cover of the motor and push up on the large gear in the motor's gear box so the shaft exposes the slot for the C-clip. There is no way around this since the shaft sinks in to the motor's case if you push down on it. My apologies for the lack of pictures. If I do the passenger side I will certainly take more.

Two mistakes I made were, I did not measure the distance of the spring before I loosened it so I could ensure it was re-tightened to the same length when re-assembled. I also did not take any measurements regarding the micro-switch. During re-assembly I simply "eye-balled" it which I am sure is not the way it was done at the factory. There was no evidence of any type of grease on the gears do I did not place any on them. Was this a mistake? Only time will tell.

The verdict, my extender works again... sorta. There are two micro-switches, one that is easily seen and one on the back of the arm assembly. These need some fine tuning and performing "trial and error" work is cumbersome as I feel you need the tension of the seat belt being pulled out to ensure it is working properly. Mine sometimes can't make up its mind where it wants to be. It works 100% of the time about 1 out of every 4 operations. This is probably a combination of the relay box and micro-switches. My personal conclusion, if I take it apart again I may just un-plug the relay box so the motor does not run and the extender stays in the panel. The reasoning for this is, if they get stuck in the extended position you either need to cycle the accessories setting on the key and work the seat belt to get it back in. If you are unsuccessful, the extended arm is a liability as you risk running in to it and breaking it while exiting or re-entering the vehicle.

Take my personal experience and thoughts for what you will. I am a big proponent for having all equipment working as it should, especially items that are unique to a particular vehicle. However, its a lot to go through for something that in my opinion, adds little value to the driving experience.
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post #98 of 99 (permalink) Old 10-13-2018, 09:06 PM
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After some probing and pondering I decided to replace just the one stripped gear (large gear shown in your pic). I did this while on the car and, fortunately for me, I had plenty of grime and grit to leave witness marks. I was able to dial everything back to where it was originally and for once... everything worked out. Currently I'm just about done with a complete brake replacement to include a Gen II brake upgrade. Soft-lines, Bearings, sensor looms, etc, Everything is NEW... so I hope I got it right.
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post #99 of 99 (permalink) Old 07-02-2019, 09:40 AM
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Have an A124 Cabrio. Put in new top cylinders and want to fix some other stuff which includes the seat belt presenters. My passenger side gears are stripped.

Looking to go into a group buy from shapeways.Any takers? Not in a big hurry.

Doug
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