Zach8131

A company called HiLine Mercedes in Orange, California. Look them up, they only do mercedes and I trust them 110%. They handle all my other cars too.

tusabes

So did you not have the noise before the trans service last week , and now you have the noise ?

If so its something they did wrong . It happens

Zach8131

No, I have always had the noise since the car was purchased. Nothing I have done thus far has helped at all.

G.AMG

Sound like an output shaft issue or something of that nature. I'm surprised the shop couldn't pinpoint the noise.

Larry1979

The noise in your video sounds exactly like my car when I took it to the dealer for a diagnosis. The dealer replaced the Pulsation Damper which solved the problem. If you've had the damper replaced and still have the noise it may be the ABC lines brushing against the body underneath the bottom of the car. If the lines aren't the culprit, I would then look to the tandem pump.

G.AMG

He said the noise isnt coming from the engine area though, its under the car. That should eliminate the pump being the problem.

Zach8131

So while I was at the gas station I thought to check on my fluids? Could this be the problem of my noise? Nothin else is panning out to tell me the culprit!

I was under the impression that the ABC suspension shared the same fluid as the power steering, but I guess not seeing this. I only had the ABC flushed and a new filter put in. The first pictures are the new ABC filter & fluid (fluid is green/blue on the napkin. The last two pictures are of the power steering filter & fluid. The fluid in there looks like chocolate milk and smells mildly like tar.

Zach8131

Pic 2

Zach8131

Pic 3 (sorry on my phone and it won't let me add all at once)

Zach8131

Pic 4

tusabes

Abc and power steering have separate filters and fluid reservoirs , located next to each other

You always need to change both they both use the same fluid and same pump but it is not shared in the same reservoir

Zach8131

But would that be the cause of my noise problem? The dirty fluid?

tusabes

Not the fluid but the pump may be noisy because of the clogged filter

Change it out and even if you can't rodeo , hit the raise /lower button about 30 times.

Also you said you changed only two pressure cells. There are more . Change them all

Zach8131

How many pressure cells are there total?

tusabes

4 in total

Part for the front and rear accumulators (You need two) is: A220-327-01-15

Be advised there are two other nitrogen spheres in the system as well. One is mounted to the pressure relief valve (Part #A220-327-02-15) which is found in the front right side of the vehicle.

The other is a small nitrogen chamber (Called an Air Cell) that sits near the fuel pump in the driver side mid/center of the vehicle, (Part #A220-320-04-15).

It is my feeling that part is what's making your noise . You have replaced the three cells listed above but not the fourth cell. Plus its located right where you hear the noise coming from

if your spheres are original and you need to replace one of these spheres, replace them all as they will all be in roughly the same condition. Over time, it is normal for the nitrogen pressure to reduce due to use/leaks. If one of the rubber internal diagrams have broken, the others may be close as well.

tusabes

https://www.parts.com/index.cfm?fuseaction=store.sectionDiagram&siteid=2 &vehicleid=186453&diagram=5781775

http://www.ecstuning.com/ES1780737/

Zach8131

Thanks! I'll buy that part on Monday, swap it, and get back to this post for the forums!

Love this car! Even with its quirks. Fascinating to learn on!

Zach8131

So, let me begin by thanking everyone for their help and support with this thread and my car. I hope this will be useful to others in the future.

NOW, I bounced around from two dealers, to my indie shop that only does mercedes, to another shop I like, to pep boys, to a craigslist "mobile mechanic" in my area and everyone said it was either the mounts or the power steering pump. Each shop was stern on their position. Both would cost about the same to do, and I just wanted the noise gone. Here is what I found out while I was at Pep Boys. They let me play with my car while it was on the lift.

Front-Left (driver side) ABC strut had deteriorated at the top. I guess there is a thick rubber mount(?) at the top of it, as shown in the picture. Here is a video of my strut moving around with just a lift of my tire with two fingers.


The other side didn't budge at all, and the other side's rubber mount(?) on top was in pristine shape, just a tad dirty. When the car was sitting off a lift, the top of the strut where that sensor plugs in was shoving out about an inch higher than the other side, and I could see metal because the rubber surround had broken. NO leaks in the strut, just the failed rubber mount. This caused the hydraulic line on the inner part of the strut (facing the engine) to touch the frame of my car (I found that out today after pondering for a long while). I quickly jacked my car up, reached my hand around the strut and pulled the line towards me so it almost entirely was touching the strut instead of the frame of my car. That 5 minute job took care of about 90% of that horrid noise in the other video I posted.

SO THANKFUL! I am going to get the strut replaced and cease throwing money at this car in various places for no reason!

PS, I did finish replacing all 4 dampers/accumulators, as well as the power steering fluid/filter exchange.

THANKS AGAIN GUYS!

Zach8131

Is there a way to ONLY replace the rubber piece?

tusabes

It may be possible to simply make your own rubber bushings as welwynnick did here

https://mbworld.org/forums/cl-class-...op-mounts.html

I would try that First - he may even be able to send you a few rubber bushings !!!

Otherwise yes the other option is a rebuilt strut

Welwynnick

I can ceratinly help, but the thing is how much play there is in teh existing bush at the top.

Its an easy and really worthwhile repair. I bet most people need it but dont' realise.

Nick

Zach8131

I definitely need it.

Replacement parts would probably have a huge market between w215's & W220's!

ibeforreal

After some serious searching I found the one in the attached photo using the part number on my strut cover. 220 327 02 92. Figured if it has a part number then it must be replaceable. It is manufactured by a company in China. Don't know if it comes with the bushings at the top but I have sent an email to their corporate headquarters and am waiting for a response. Will post here once I find out.

Zach8131

Did you get a response from that Chinese company to see if it came with a new strut mount? I'm still looking for some new mounts for me CL55

Welwynnick

That looks like the plastic cover for the strut, that goes around the outside of the spring. I bought a set for mine to replace two disintegrating covers. There were no bushes there.

Nick