compromising under pressure (Get It) 
ABC ACTIVE BODY CONTROL DRIVE CAREFULLY??
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Unless somebody has better ideas?
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2004 S600
Thanks for all the replies.
Take care,
Brian
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Cl65 AMG
I received my Star Diagnostics Factory DVD today and it says that the hose is indeed a "Pulsation Damper" (Special Protection Version). This DVD is amazing. Well worth the $85 I paid. If anybody needs to know how to do something "By The Book" let me know and I will look it up. The procedure to remove and replace the hose is extensive but very doable. I will probably start tomorrow after work and get-er-done.
Thanks for all the replies.
Take care,
Brian
Thanks for all the replies.
Take care,
Brian
Brian,
I didn't know about any CD ? Can I get one ?
Thanks
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2004 S600
http://youtu.be/IQ1eKddstxM
Pretty cool stuff.
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2004 S600
I got mine from here: http://auto-repair-manuals.com/
I am going to go back and get the DVD for my R500 today. This DVD is really great!
I am going to go back and get the DVD for my R500 today. This DVD is really great!
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2004 S600
Can somebody please explain to me exactly how allowing air into the tandem pump will cause it to grenade as many have stated? I certainly don't understand how something as compressable as air could cause a device that is designed to handle fluid pressures in the 3000psi range to get damaged. I understand the dangers of running the pump dry thus causing bearing and piston damage, but air? That makes no sense to me.
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2004 S600
Oh and by the way, I don't agree with Mercedes calling this hose a damper. Much more like a catestrophic pressure relief valve. Especially judging by the fact the dealer told me he replaces so many of these that he must carry 2 in stock at all times. IMHO
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MBWorld Fanatic!
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Can somebody please explain to me exactly how allowing air into the tandem pump will cause it to grenade as many have stated? I certainly don't understand how something as compressable as air could cause a device that is designed to handle fluid pressures in the 3000psi range to get damaged. I understand the dangers of running the pump dry thus causing bearing and piston damage, but air? That makes no sense to me.
same applies to fuel pumps
lol at "catastrophic pressure relieve valve"
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2004 S600
Now I get the running dry part then if you continue to run the pump it will "eventually" give up the ghost. However if you read what some are writing on this forum the second air hits the pump, "BOOM!!!!!" it's a goner.
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From: Southern California, USA
2003 CL55 AMG
From my understanding and reading into the replacement procedure for the ABC pump, if the pump starts to suck air may lead to loss of suction (pressure). If this happens, the pump stops circulating the fluid and will run dry even though the reservoir may have fluid in it.
Upon replacement of the pump, you need to fill the reservoir and then pressurize it with a air hose to get the pump to start sucking and recirculating the fluid.
Upon replacement of the pump, you need to fill the reservoir and then pressurize it with a air hose to get the pump to start sucking and recirculating the fluid.
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so yes- air "bubble", but it sticks in the pump and never leaves...
for that same reason when replacing pump you need to prime it as it does not generate enough vacuum when running dry to draw fluid on its own.
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2004 S600
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or a pulley. they are known to fail at a very high rate.
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2003 CL500
Does any body know how to do a proper tandem pump exchange. I bought another used tandem pump to replace the old one that was leaking and now i took the part out but need to know the proper procedure to putting the other one in. thanks in advance
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From: Southern California, USA
2003 CL55 AMG
As far as the proper procedure goes, you will need a shop computer (DAS) to Rodeo and verify pressures as well as an air compressor to to prime/pressurize the reservoir if you want to follow Mercedes service exact steps.
I can print you out the procedure from WIS (Workshop Information System) when I get home. Alternately, you can search for a user names Oxygen. He posted the exact steps with pictures in the past.
Last edited by awiner; Aug 23, 2012 at 02:14 PM.
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sl500, bentley GT, 911 cab, 1947 lincoln continental cabriolet
Update on Arnott ABC shock replacement
I want to provide an update on the resolution to my "ABC Drive Carefully" post in case others have a similar problem.
Independent mechanic shop read all of the codes and said there were 5 or 6 including low pump pressure. Pump pressure tested OK. I have had a very slow seeping right rear shock for a long time which I ignored because it was so slow that it did not affect fluid level. Mechanic suggested replacing shock because it may be causing a domino effect throwing other codes.
Replaced shock with a rebuilt from Arnott Industries for $599. Have heard they are reliable and perhaps even better quality than OEM from Mercedes. After replacing shock, filters and flushing, no more codes or warning lights. I'm assuming minor leak of fluid was causing pressure variations.
Incidentally, I have had a low speed minor "clunking" that seemed to be coming from the left-front that nobody could diagnose. That went away with the shock replacement. Car is performing flawlessly -- just wish as many of you do that ABC problems were not always hovering over us -- the system is so complex and prone to failure. I got an appreciation for the magnitude of the system just by lifting that single shock --- shipping weight was 29 pounds.
Independent mechanic shop read all of the codes and said there were 5 or 6 including low pump pressure. Pump pressure tested OK. I have had a very slow seeping right rear shock for a long time which I ignored because it was so slow that it did not affect fluid level. Mechanic suggested replacing shock because it may be causing a domino effect throwing other codes.
Replaced shock with a rebuilt from Arnott Industries for $599. Have heard they are reliable and perhaps even better quality than OEM from Mercedes. After replacing shock, filters and flushing, no more codes or warning lights. I'm assuming minor leak of fluid was causing pressure variations.
Incidentally, I have had a low speed minor "clunking" that seemed to be coming from the left-front that nobody could diagnose. That went away with the shock replacement. Car is performing flawlessly -- just wish as many of you do that ABC problems were not always hovering over us -- the system is so complex and prone to failure. I got an appreciation for the magnitude of the system just by lifting that single shock --- shipping weight was 29 pounds.
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Cars
If you do find that the system is in need of fluid and there is no leak, the issue at hand is that the accumulator/accumulator's are losing Nitrogen and being replaced with fluid. Once the fluid replaces all of the Nitrogen then you will have to replace them. I recommend replacing all of them at once. Do not replace one at a time as they will follow suit of failure. Like I tell everyone. Do the BOUNCE TEST it is 100% on the money. If you go the front of the car and try and bounce the car up and down and it bounces then your accumulators is weak. Do the same to the rear. If the car doesn't move then your system is OK but if it keeps loosing fluid it will eventually become like a bouncing old Cadillac that feels like it need shocks. If you see a leak. Stop the car and turn it off. Call a tow truck and have it repaired before you pump out all the fluid and then you run the chance of burning up the pump as well as the intermediate pump. Then you will wish you hadn't waited to fix that pesky little drip.
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2004 S600
How many accumulators are on the 2004 S600? I have seen many different diagrams that show other devices they call fluid reservoirs and even air chambers.
With regard to the "bounciness" problems noted above and replacing accumulators to correct it, how many and where are they located?
Thanks,
With regard to the "bounciness" problems noted above and replacing accumulators to correct it, how many and where are they located?
Thanks,
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,340
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From: Southern California, USA
2003 CL55 AMG
How many accumulators are on the 2004 S600? I have seen many different diagrams that show other devices they call fluid reservoirs and even air chambers.
With regard to the "bounciness" problems noted above and replacing accumulators to correct it, how many and where are they located?
Thanks,
With regard to the "bounciness" problems noted above and replacing accumulators to correct it, how many and where are they located?
Thanks,
4 units. 3 different part #'s
(1) Pulsation Dampener
(1) Pressure Relief
(2) Accumulators
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2004 Mercedes SL55
2004 SL55 ABC pump problem
My 2004 SL55 ABC pump was leaking fluid so I purchased a rebuild pump from eBay. After my mechanic installed there's still no pressure and the ABC warning msg stays on. After tried a few things including change the filter it still no working. So I asked a Mercedes mechanic to look at it and he confirmed the pump is no good. So I got another pump from the supplier and my mechanic put it on again but still there's no pressure. I notice the ABC warning come up right after I start up the car when the engine is hot. But after I parked overnight the warning pop up after I drive the car for 5 mind. So there's a difference between cold and hot engine. Any idea what's the problem? Or simply supplier with bad quality. Thankd
