Pagoda SL Group

W113 Pagoda SL Group => General Discussion => Topic started by: Shvegel on February 22, 2021, 23:01:33

Title: Anyone with a Bundt spare in the trunk?
Post by: Shvegel on February 22, 2021, 23:01:33
Curious how it is mounted.  Looking for more pictures of the alloy spare mounting post.
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: GM on February 23, 2021, 23:15:14
Found on FB today
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: GM on February 23, 2021, 23:16:58
More pics
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: Shvegel on February 24, 2021, 11:41:26
GM,  Thanks! 
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on February 24, 2021, 15:05:45
Working on it!!
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: badali on February 24, 2021, 17:16:11
That part actually came up on a parts web search I just did.  It may be still available.  Here is the link.

https://www.mercedesbenzpartscenter.com/oem-parts/mercedes-benz-fixture-1138900081
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on February 24, 2021, 20:32:28
I am still amazed that NOBODY, NOBODY, here has a late 280SL that came with 5 Fuchs wheels from the factory and wants to share how his spare wheel is mounted in the trunk.
Is it one of these well guarded secrets only true, true Mercedes aficionados are supposed to be privy to?
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: Shvegel on February 25, 2021, 02:33:47
Badali,  I have tried to order other NLA parts from that very website but I always get an email telling me that part is no longer available.
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on February 28, 2021, 15:01:29
I am trying to finish drawings for the part. One thing I cannot make out is the correct position of the hook for the wheel chock. It is obviously different than for the steel holder. I looked at my car to see how the wheel chock sits with the steel wheel, but mine is disassembled and it doesn't seem to go on right. Can someone post a picture of how the wheel chock is mounted on the holder, please?

I also found this part loose in the trunk and do not know what it is. Can someone tell me what it is?
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: Jonny B on February 28, 2021, 16:12:27
That is one of the holders for the battery cable from the positive post to the starter. It is bolted to the front of the engine at the pan.
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on February 28, 2021, 16:20:29
Wow! Thanks, Johnny. Wonder what I did and how this ended up in the trunk???
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on March 01, 2021, 16:29:18
O.K., Ladies and Gentlemen. Here are the sketches you can use (try) to make the holder. All dimensions are metric and taken directly from the pictures or extrapolated from there.
Please note the following:

First, the alloy spare is mounted the SAME WAY as the steel - inside up! NOT outside up as mentioned earlier.
The longer center hub of the alloy wheel requires the holder to be "shorter" for the wheel to clear the truck lid.

As Pat (Shvegel) said, the most difficult item is the round top, which is hollow in the original part and probably has a thick round plate welded to the top from the inside, which carries the threads for the clamp bolt. This can be made from a solid round piece with a hole drilled and tapped (heavy) or a tube type part with a flat disc on top and a M12x1.5 nut welded to it.
The length of the cylinder should not exceed 60mm in order to achieve proper clamping. The bottom has to have a lip which has at least 75mm diameter in order to make the wheel hub sit on securely. For ease of manufacturing, this could be a separate ring welded to the cylinder from the bottom.

The rectangular box profile post is 60mm x 50mm for the original part and due to availability of stock material can be made of 2" x 2".
Wall thickness I have assumed is 3mm or 1/8"

The post needs to be slash cut on both ends to achieve a lean angle of 55° from vertical leaning to the left when viewed standing behind the car. This is necessary for the wheel to clear the right rear quarter panel, similar to the lean of the steel wheel holder.
There is another slash cut on the BOTTOM of the post to achieve a 5° lean angle of the top towards the rear of the car in order to make the wheel slant confirming with the trunk lid.

The base plate dimensions and  mounting hole positions are suggestions only and need to be patterned after the original plate of the steel wheel holder in your car in order to fit. They may vary slightly from vehicle to vehicle.
The only unknown is the hook for the wheel chock. From the pictures, I deducted it is welded to the side of the post which points towards the fron the car and it is turned by 90° compared to the steel wheel design. The wheel chock should bolt to it accordingly. I will make a few trial on my car and confirm there is ample space for the chock.

Look at the drawings and if you have any questions, ask me. Also, please point out obvious errors and missing points.
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: WRe on March 01, 2021, 17:45:10
Great work, thank you both!
...Wolfgang
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on March 02, 2021, 13:29:39
There is still one open question and nobody has come forward with an answer.
I have 5 alloys with my car, but they have been acquired later and were not ordered with the car. The question is, if you ordered alloys from the factory for a 71 model 280SL (not dealer installed), did you get 4 or 5 wheels.
From what I read - I can't tell if that's the case - you would need DIFFERENT MOUNTING BOLTS for the steel spare. How would that have worked?

I could still use a clearer picture of how the wheel chock mounting hook is welded to the post??

In a parts list I have, the alloy wheel holder is listed as "Zubehör". That means "Accessory". Is it possible, that the holder was offered by Mercedes as a retrofit for those who added an alloy spare and the factory never supplied 5 wheels?
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on March 02, 2021, 19:42:33
Here is the final issue in this matter, addressing the chock mounting hook. I played around with a "prototype" (that a very talented and handy person fabricated) - as good as a production part!
First I tried with a flat hook bracket mounted on the side of the post, as sort of could be seen in the pictures of the MB part. I did not work. There was a space of about 20mm left between the bracket and the wheel chock, although the hole lined up perfectly with the chock sitting flat on one side. The situation could be remedied by a spacer or by bending the hook bracket. And the latter worked perfectly. The chock has clearance to the spare wheel hub and the jack that is mounted behind the post.
A few pictures divided into several posts:
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on March 02, 2021, 19:44:08
More pictures
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: MikeSimon on March 02, 2021, 19:46:32
More pictures
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: Berggreen on March 02, 2021, 20:12:01
Fantastic - looks great! Thanks a lot.  :D

Would someone be interested in making a small number production of these holders for interested club members? I would definately be interested in buying one for my 1970 280SL, if such a small lot of holders would be made available.  :)

Thanks,

Christian
Title: Re: Anyone with a Bundt spare in the trunk?
Post by: AndrewB on March 02, 2021, 20:18:21
I would also be keen