Mercedes-Benz Forum banner

1 - 14 of 14 Posts

·
Registered
2009 S550, 1973 Avanti II, 2008 Silverado LTZ
Joined
·
887 Posts
Discussion Starter #1
Sorry to bring this up again, but I have been trying to diagnose this noise for the last couple weeks and I keep coming back to the pulsation damper because the more I read about it, the more it seems to fit! Here's a short video I just shot, and hopefully you can hear it well enough. Very obvious in the car between about 1000 and 2500 RPMS once the car is warmed up. My mechanic friend thinks it's the motor mounts, but I just really don't think so; they were replaced last year at the dealership according to the extensive records I have on this car. It's an S550 with ABC, so excuse me for posting here, but you guys have the most experience with this system.
Thanks!!
https://youtu.be/WNOuufrCkkY
 

·
Registered
2005 SL65 plus 13 other non MB toys
Joined
·
690 Posts
It’s hard to hear in the video. But if you do not have any record of that pulsation damper being replaced any time recent then just put one in for preventive maintenance. Chances are that is your problem.
 

·
Registered
2009 S550, 1973 Avanti II, 2008 Silverado LTZ
Joined
·
887 Posts
Discussion Starter #3
I know the video isn't much since I think my cell phone tries to ignore ambient noise! It's a growling noise, sounds like a bearing unless you're outside the car. I actually have a receipt for the pulsation damper being replaced about 4 years ago (20K miles), for the same reason. Does seem odd it would go out again this soon, but I'm scratching my head otherwise. I did order a factory refurbished one this morning though.
 

·
Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
Joined
·
19,160 Posts
Sounds like the PD to me. As for why it went our so soon. they only sell rebuilt units now. Maybe the quality of the rebuild is not as good as new OE?
 

·
Registered
2009 S550, 1973 Avanti II, 2008 Silverado LTZ
Joined
·
887 Posts
Discussion Starter #5
Sounds like the PD to me. As for why it went our so soon. they only sell rebuilt units now. Maybe the quality of the rebuild is not as good as new OE?
Interesting. I saw some listed as new for over $300. At that price I might as well get a rebuilt pump! The $90 I got the rebuild for makes it worthwhile to give a try.
It might take me a month or so to get around to doing it, but I want to thank you in advance for your write up on how to replace it without removing the pump. Should make things a lot easier!
 

·
Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
Joined
·
19,160 Posts
The lowest price I could find for a genuine MBZ rebuilt one was $200, incl. a $35 core charge (so about $165 net). Maybe the $90 part was cheap Chinese crap and is why it failed so soon?
 

·
Registered
2009 S550, 1973 Avanti II, 2008 Silverado LTZ
Joined
·
887 Posts
Discussion Starter #7
The one that was replaced 4 years ago was at the Mercedes dealership, so I doubt it was Chinese.
The one I ordered was $90:rolleyes:
Genuine Power Steering Pump Insulator 000-466-04-00-80
 

·
Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
Joined
·
19,160 Posts
Yep, that's the same part I bought. Either you got a deal, or the price has gone up int he last few years. I bought mine about a year ago.
 

·
Registered
2009 S550, 1973 Avanti II, 2008 Silverado LTZ
Joined
·
887 Posts
Discussion Starter #9
Yep, that's the same part I bought. Either you got a deal, or the price has gone up int he last few years. I bought mine about a year ago.
I contacted the eBay seller about it. He bought it from the dealer at over $200 but then found out that he needed a new pump, so he never installed it and the dealer wouldn't take it back because it had been too long. I won't get until next week, but it seems I may have got a deal!
 

·
Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
Joined
·
19,160 Posts
Ah, that makes more sense. I thought you bought it directly from the dealer fro that price.
 

·
Registered
2009 S550, 1973 Avanti II, 2008 Silverado LTZ
Joined
·
887 Posts
Discussion Starter #12
Update: With some help from a very handy friend with a lift, yesterday we changed both motor mounts, transmission mount and pulsation damper, along with serpentine belt and pulleys. The mounts were a waste of time since they were just fine, but I thought for sure the PD would cure my whine. It did not, and I am now wondering if I shot myself in the foot buying one "new in box" from a seller on eBay. When we took the protective sleeve off, there was some oil in there. Do they come shipped with some oil in them from the manufacturer?
I really don't feel like it should be the pump itself; no leaking or straining when turning the wheels or raising the car, just that moaning sound from about 1000 to 2000 rpms. Frustrated!
 

·
Coupe/Convertible Forums Moderator
CURRENT: 2011 SL550, 2011 C300 FORMER: ML350, CLK550 Cabriolet, C240, ML320, 300TD
Joined
·
19,160 Posts
I have pretty much stopped buying any "important" car parts on eBay or Amazon due to the fakes and scams out there. I am pretty sure that MBZ only sells re manufactured pulsation dampeners now. I could not find a "new" one and all of them required a core deposit. They come in a clean box (other than handling marks on the outside) and the threaded end of the dampener has a plastic seal on it. It should be totally clean and look like new.
 
1 - 14 of 14 Posts
Top