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 Working on air bellows
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6.3Nut

USA
202 Posts

Posted - 07/17/2016 :  17:04:44  Show Profile  Reply with Quote
Hello! Guys I have to put the front wheels on 11" stands to work under the car, so was wondering if it is OK to lift each front wheel from the control arm, place the stand and then release the jack. I want your expert opinion before I adventure this ave.

Of course the air bellows will have air in them.

There cars and then there are BABIES!
1969 Euro Model
10901812000931
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benz_head

USA
449 Posts

Posted - 07/17/2016 :  22:42:48  Show Profile  Reply with Quote
I have to think about this.....but I don't think that's stable enough. What work do you need to do?

I would build a solid wood platform and put it under the engine cradle, using jack stands as backup. Or, dig a pit under it in your yard. I don't get under a car unless I can kick it repeatedly and it won't budge. You cannot trust airbags....ask Karl Middelhauve.

benz_head
#1349

Edited by - benz_head on 07/17/2016 22:46:21
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6.3Nut

USA
202 Posts

Posted - 07/17/2016 :  23:09:32  Show Profile  Reply with Quote
quote:
Originally posted by benz_head

I have to think about this.....but I don't think that's stable enough. What work do you need to do?

I would build a solid wood platform and put it under the engine cradle, using jack stands as backup. Or, dig a pit under it in your yard. I don't get under a car unless I can kick it repeatedly and it won't budge. You cannot trust airbags....ask Karl Middelhauve.

benz_head
#1349



Benz-head, thanks for the concern. The stands I am talking about are solid block of 6x6 wood and then top and bottom have 12x12X2 wood planks so the structure is very solid. As a back up I will put jack stands under the car. Man, I am as scared of raised cars as any, so I always make sure the setup is secure with redundancy - Petroleum Engineering made me very cautious.

So my question still is, can I lift the tires from the control arm to slide the stands under the tires.

There cars and then there are BABIES!
1969 Euro Model
10901812000931
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Art Love

Australia
6231 Posts

Posted - 07/18/2016 :  06:36:04  Show Profile  Reply with Quote
I am not aware of any reason why you cannot use the outer end of the lower control arm to lift the corner of the car. You would need some timber between the jack and the metal. It is not a normal location to jack a car, so it is your call.
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6.3Nut

USA
202 Posts

Posted - 07/18/2016 :  10:04:00  Show Profile  Reply with Quote
quote:
Originally posted by Art Love

I am not aware of any reason why you cannot use the outer end of the lower control arm to lift the corner of the car. You would need some timber between the jack and the metal. It is not a normal location to jack a car, so it is your call.



Thanks Art. I was only worried about damaging the front-end, but your comment gives me confidence.

There cars and then there are BABIES!
1969 Euro Model
10901812000931
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mookschank

Australia
8 Posts

Posted - 03/10/2017 :  17:20:08  Show Profile  Reply with Quote
Hi everyone,

First post here for me here, so here goes....

Just bought a W109 and am putting it back on the road. Have replaced all the air bags and learnt a couple of things about them. Instead of the steel fabrication for the airbags I did a plywood version (see pic if i have worked out how to upload pics ok). I'm only doing 4 all up so plywood will just see me out.

Also, putting the new airbag back on the ring, after stuffing around trying to squeeze it in, I worked out I could just sit the air bag on a 3 inch cube of wood on the table and just squeeze the ring down. The airbag elongates when you do this then goes pop as it beds into place - easy as.

I do have question for the forum if someone can help me. I have tried to source the o-rings for the airbags and have been quoted $48 AUD for the outer and $36 for the inner each! That's hundreds just to do the 4 airbags!

Can anyone give me the dimensions for the inner square round o-ring?

I'm planning to go to a seal shop and buy them. I already have the outers, they're straight forward nitrile o-rings. I'm thinking the worse case scenario from not buying MB seals is that they leak and will have to redo. The pneumatic connection system is nothing really unique though so it shouldn't be a problem finding the right seals.



Thank you,
Mook.



Edited by - mookschank on 04/24/2017 03:09:13
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Art Love

Australia
6231 Posts

Posted - 03/10/2017 :  22:08:27  Show Profile  Reply with Quote
Suggest you check with Tom Hanson at the M-B Classic Center in Irvine, California for pricing for the seals rather than Australia. You can also check with Martin Werminghausen in Massachusetts because I am sure that Martin will have had them reproduced. Google "600 air suspension" and Martin should come up. If you want to try your local seal supplier, I suggest you take one of the used square seals that you have to see if they have anything similar. The ID and OD should be preserved. The depth is the same as the thickness, ie they have a square profile.
Art
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abl567

Australia
930 Posts

Posted - 03/10/2017 :  22:39:15  Show Profile  Visit abl567's Homepage  Reply with Quote
Also try MB Spares in Canberra, If I remember correctly I bought some from them for about $8 each, Part number A 112 997 04 40

or

http://www.genuinemercedesparts.com/oem-parts/mercedes-benz-seal-ring-vlrub-1129970440

https://www.mbpartsexpress.com/oem-parts/mercedes-benz-seal-ring-vlrub-1129970440

Tom is the most reliable though.
Ant



300SEL
6.3 #2723, my first classic Benz
3.5 #8659, my second.
2 to go...
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mookschank

Australia
8 Posts

Posted - 03/11/2017 :  06:28:32  Show Profile  Reply with Quote
Thanks for the replies guys.

The prices were from MB spares so have hit a wall with that one. Might try the USA route...

Bizarrely, the square inner o-rings were missing completely when I pulled the fittings out. I've measured the fitting inner diameters and air holes with the vernier and hope to get something that functions as intended.

Update:
I bought a bunch of OEM seals from the USA, except for the small fitting outer round o-rings as they were $25 each - ouch. When looking for these o-rings, I noticed they have the same part # with an electronic injector seal so hence would be made of Viton though I'm not sure on hardness. Anyhow, decided to take the punt and I went to the seal shop and bought some Viton o-ring round seals at about 0.50 cents each.

And for reference for anyone, I measured up the OEM seals and they are:-

Small square inner: 1.98mm width/height, 1.5mm thick, 10.55mm outer dia.

Large square inner: 1.98mm width/height, 1.7mm thick, 12.95mm outer dia.

Large round o-ring: 2.14mm width, 14.37 outer dia.

Small round o-ring (not OEM, ones I got from seal shop): 1.94mm width, 12mm outer dia.

Edited by - mookschank on 04/24/2017 03:07:24
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orlandofl

USA
1 Posts

Posted - 04/07/2017 :  11:23:30  Show Profile  Visit orlandofl's Homepage  Reply with Quote
Awesome write up! I love the sense of humor you have with the extra pictures. I'm going to do a write up similar to this one on my 6.3 for the window tint I having www.orlandocustomwindowtinting.com do.
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mookschank

Australia
8 Posts

Posted - 06/08/2017 :  06:39:28  Show Profile  Reply with Quote
Hi all,

I now have to get the valve gear rebuilt. In preparing for this, I would like to insert the schrader valve fittings to keep the car up.

Does anyone know the thread type of the air bellows for the schrader valve fitting to screw into? I will be looking to source the correct fitting from somewhere.

Edited by - mookschank on 06/08/2017 06:41:44
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GeraldK

Canada
89 Posts

Posted - 06/08/2017 :  11:53:15  Show Profile  Reply with Quote
I believe the thread for the schrader valve is M12x1.5mm. If you wanted to order from Mercedes the part number for the valve is 112-320-06-58. Probably around $10US.

Gerald
1969 300 SEL 6.3 #0795
1959 190 SL
Calgary, AB
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Art Love

Australia
6231 Posts

Posted - 06/08/2017 :  18:09:19  Show Profile  Reply with Quote
Tom Hanson had the Schrader valves in stock and be aware that you only need 3, not 4, because the rear bellows are connected by a cross pipe and only the left rear tank has the 12mm fitting.
Art
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mookschank

Australia
8 Posts

Posted - 06/22/2017 :  09:11:03  Show Profile  Reply with Quote
Thanks for the info guys, have emailed Tom and he is arranging for postage of the items over, cheers.
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werminghausen

USA
771 Posts

Posted - 06/14/2018 :  09:19:51  Show Profile  Visit werminghausen's Homepage  Reply with Quote
I just read this.
If need is I have the rectangular custom seals for the M12 x 1.5 air fittings.
Small and large custom rings. I am using these for each of the many air suspension fittings during rebuilding these units.
The M14 x 1.5 fittings used on the 600 regulator and W112/109/100 rear spring connectors have bigger size seal rings and I also have them if needed, rectangular inner ring.

Best, Martin
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