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  Topic Review (Newest First)
08-08-2019 01:20 PM
AG129
Quote:
Originally Posted by Pazo View Post
Mahunt, AG129,

You may find interesting, how Mercedes salespeople were instructed to describe ADS1 advantages. It was standard in SL600 when it arrived. ADS was optional in other models and added 5% to the 500SL base price tag - even more to the 300SL. However, the speed-dependent height control was not sold in the US. ADS1 was replaced by ADS2 from Sep 1995.

A Dutch collector has uploaded huge selection of Mercedes brochures in his website "oudemercedesbrochures"; the attached extract is from there.
The image you uploaded is broken, it won't load.

What I find weird is why they differentiated between the Euro spec cars and the US spec with the height control option.

I think it might have something to do with bumper height regulations or light regulations in the US, but I'm not sure.
08-08-2019 12:01 PM
Pazo Mahunt, AG129,

You may find interesting, how Mercedes salespeople were instructed to describe ADS1 advantages. It was standard in SL600 when it arrived. ADS was optional in other models and added 5% to the 500SL base price tag - even more to the 300SL. However, the speed-dependent height control was not sold in the US. ADS1 was replaced by ADS2 from Sep 1995.

A Dutch collector has uploaded huge selection of Mercedes brochures in his website "oudemercedesbrochures"; the attached extract is from there.
08-07-2019 10:08 PM
AG129
Quote:
Originally Posted by Pazo View Post
Well AG129,

Opposite to your upper encircled "S" is a grub screw with 3 mm allen head. In this channel there is one of the three check-valves the sliding valve actuates. This specific S-channel valve provides oil pressure for the height control rods, front & rear. My hypothesis is that you could have dirt/sludge in this valve. It cannot be disassembled but you can try move the check-valve by pressing with thin wire from both sides until the valve moves freely, maybe 1-2 mm. Sorry to say, to do this you must disassemble your ADS1 main control valve.

See also Jon Bearpark's drawing in this thread. Also, see this picture.

Hope I managed to clarify…?
Thanks Pazo

Yes that does make things more clear for me to understand. Unfortunately I won't be able to tackle this until next Thursday. So I have a week to study the old spares I got and hope when I take my unit apart that it finally works out as intended.

Manhunt, yeah I watched those videos of Citroens running around on three wheels or changing tires without a tire jack, very impressive. I do understand their ADS is tuned for a very different purpose.

I realized that with time the comfort mode is becoming slightly more forgiving or comfortable if that makes sense. Yes now the difference between comfort and sport is very noticeable, maybe the car needed to be driven around some more to self-bleed.

I have the AMG monoblocks with:

245/40-18 Michelin PS4 on 8 inch et31 wheels in the front and 20mm H&R spacers bringing my offset down to et11

275/35-18 Michelin PS4 on 9 inch et35 wheels in the back with 25mm H&R spacers bringing my offset down to et10

The spacers are a bit aggressive and require fender rolling, but the widened track actually made a difference to handling a bit even before restoring ADS

With ADS on sport, the car feels so planted and it keeps pushing you to try and find the limit of grip. I love how the car feels on sport mode.

On comfort mode the car is much more lenient and allows more body roll and generally makes you feel less bumps on the road but only to a certain extent. As you said, I think comfort mode would work best with the original 16 inch wheels with big sidewalls.

Too bad we can't drive on three wheels like the Citroen 😋
08-06-2019 12:04 PM
Pazo Well AG129,

Opposite to your upper encircled "S" is a grub screw with 3 mm allen head. In this channel there is one of the three check-valves the sliding valve actuates. This specific S-channel valve provides oil pressure for the height control rods, front & rear. My hypothesis is that you could have dirt/sludge in this valve. It cannot be disassembled but you can try move the check-valve by pressing with thin wire from both sides until the valve moves freely, maybe 1-2 mm. Sorry to say, to do this you must disassemble your ADS1 main control valve.

See also Jon Bearpark's drawing in this thread. Also, see this picture.

Hope I managed to clarify…?
08-06-2019 11:18 AM
mahunt The ADS system is engineered more for highway use rather than the old Citroen setup which seemed designed to traverse a plowed field. I think I even remember seeing a video of an old DS that was still mobile after removing 1 wheel. The ADS option doesn't offer those capabilities.

For an inkling into what ADS can do, read either the ADS I or ADS II information/maintenance (I only know about the ADS II system).

https://arkiv.mbentusiastklubb.no/te...129-ads-ii.pdf

Having owned an ADS II equipped R129 for a few years, I can say there is a noticeable difference between the hard fault ride, the Comfort setting and Sport. I've experienced all these situations. I can also say that tire selection does play a part as well. I've never experienced the ride with the 16 inch tires, but the Continental ExtremeContact tires on the 18 inch AMG Aero II rims was pretty good. My current General Tire equipped wheels are a little noisier and harsher, but the price was right and they are lasting WAY longer while offering better handling.

I can't help but think that the original 16 inch rims would provide the most luxurious ADS ride due to the volume of captured air per tire. The 18 inch rims are adequate for comfort, but most likely not ideal. I find the greatest use of the ADS system for highway travel. If the road is in good condition, the Sport setting provides a tighter chassis, but when the road surface degrades or has expansion joints, a flick of the ADS rocker to Comfort does a nice job in muting a jarring ride.

The R129 is a GT and ADS makes it a more enjoyable tourer.
08-05-2019 04:49 PM
AG129
Quote:
Originally Posted by Pazo View Post
AG129, glad to hear your ADS works now.

ADS1 height control is a simple system, where majority of problems is related to dirt or leaks.
- You write that you have verified the two-way solenoid; it clicks when height change is selected.
- You also mention you have removed the tiny sintered filter from your main valve (Y36).
- Your control rod pistons could be jammed but unlikely both have failed simultaneously. Rods can be checked by looking at them when an assistant operates the height control switch – they’d change length immediately.

So the remaining issue I can think of is jammed check valve in the main control valve. There are three check valves that the sliding piston actuates. The suspect one is behind the scrub screw in oil channel ”S”. When the car runs, also this check valve opens and delivers pressure to Y36 height control from front spheres. I managed to clean this valve by accessing from both sides with thin steel wires plus compressed air. AFAIK this check valve cannot be dismantled. This is only my best guess since you write ”not sending enough oil pressure into the front and rear pistons that are attached to the levers”.
There are a few relevant pictures in this (somewhat exhaustive) thread: https://www.benzworld.org/forums/r12...pension-3.html

Good luck!
Hey Pazo

I looked at the thread but couldn't identify the check valve you are talking about. I took a screenshot and circled round the S oil channel. Is this it or do you mean the S channel in the main valve/distributor where all the hydraulic lines are connected?

How do I check that it opens when the car runs? Don you mean to disconnect the oil line at S in the main distributor? I believe the main distributor feeds two lines to the front height valve and two lines to the rear one.
08-05-2019 12:41 AM
Pazo AG129, glad to hear your ADS works now.

ADS1 height control is a simple system, where majority of problems is related to dirt or leaks.
- You write that you have verified the two-way solenoid; it clicks when height change is selected.
- You also mention you have removed the tiny sintered filter from your main valve (Y36).
- Your control rod pistons could be jammed but unlikely both have failed simultaneously. Rods can be checked by looking at them when an assistant operates the height control switch – they’d change length immediately.

So the remaining issue I can think of is jammed check valve in the main control valve. There are three check valves that the sliding piston actuates. The suspect one is behind the scrub screw in oil channel ”S”. When the car runs, also this check valve opens and delivers pressure to Y36 height control from front spheres. I managed to clean this valve by accessing from both sides with thin steel wires plus compressed air. AFAIK this check valve cannot be dismantled. This is only my best guess since you write ”not sending enough oil pressure into the front and rear pistons that are attached to the levers”.
There are a few relevant pictures in this (somewhat exhaustive) thread: https://www.benzworld.org/forums/r12...pension-3.html

Good luck!
08-04-2019 07:49 PM
AG129 Ok so here's an update.

My ADS works but not the button to raise or lower the car. The sport comfort button works and I have no dash lights at all. I read Pazo's thread and tried installing three different solenoids that control this function, One of them raised the car a tiny bit and then stopped as fluid rushed out of the hex screw as it wasn't properly tightened. We re-bled the system properly but it still doesn't work.

I test the solenoid with a car battery and it gives an audible click when 12volts are applied. You can also feel that click if you put your hand on the solenoid while installed in the car and have someone press the raising button.

I removed the sintered filter completely but still nothing, bled the car and tried again but still nothing.

Now I know that the car works perfectly and raised when you raise the lever by hand, I also know that the solenoid gives an audible click when you press the button or test it with a battery. That means the car is getting the electrical signal to raise, but it not sending enough oil pressure into the front and rear pistons that are attached to the levers. We are able to move the piston earlier but not it seems much tighter.

Does my problem lie within the solenoid or the pistons that should push up on the levers or something else entirely?
07-09-2019 08:17 PM
AG129
Quote:
Originally Posted by spud06 View Post
From what I've gathered after reading many, many posts, I would start with checking all of the suspect wiring harnesses. You've already indicated the oil level wire was bad. I would check all the harness for insulation failure first. I'm about ready to acquire a 95 SL600 and that will be my first project, rewiring the harnesses.
Hello Spud06

My car is a 91MY with CIS KE-Jetronic fuel injection, so it is exempt from the wire harness issue that affected the 93-95 LH fuel injection cars. The wire of the oil level switch I mentioned was a bit brittle yes but just the end connecting to the oil level sender, due to age and extreme heat here.

I'm suspecting the ride height solenoid that Pazo mentioned in his post and I pm'd him as well regarding that. I didn't have free time yet to tackle this issue, but most probably I will in the next week or so.

Now everything works fine with the exception of the ride height switch. After some high speed testing I can confirm that the sport/comfort button works. The car has way less body roll when sport mode is activated, and is a bit forgiving when comfort is selected.

The only thing that is a tiny bit disappointing is the level of comfort with ADS isn't what people claim or made it up to be. Then again, I probably had very high expectations. I've been watching a lot of those old Citroen videos to get a better understanding of how the system works, but most probably the Citroen older cars have a much different iteration of the system that is geared more towards comfort. Some of those cars can drive on three wheels

I'm quite happy with the sport side of it but the comfort side isn't as comfortable as my 1996 E320 W210. That car has 16 inch tires though and I have the staggered 18 inch AMG setup. So that probably explains it.
07-07-2019 06:32 AM
spud06 From what I've gathered after reading many, many posts, I would start with checking all of the suspect wiring harnesses. You've already indicated the oil level wire was bad. I would check all the harness for insulation failure first. I'm about ready to acquire a 95 SL600 and that will be my first project, rewiring the harnesses.
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