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CL-Class (W215) 2000-2006: CL 500, CL 600

Pulsation Dampener Service

 
Old 04-09-2017, 09:17 PM
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Pulsation Dampener Service

Is there anything to rebuild in a pulsation dampener like the valves? I've had some light bouncing in the car without any errors or warnings and I suspect its this. I purchased a new bulb to put on and I can see that there are a couple places you can put a wrench on the body, but I don't want to start pulling it apart blind. I'd like to change whatever o-rings are in it while I've got the system apart changing leaky hoses.
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Old 04-10-2017, 04:23 AM
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There are four air cells in the suspension system , the ones known as "accumulators" are the ones which can cause a bouncy ride

the one called a pulsation damper doesn't affect the ride , it's to reduce vibration and noise

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).
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Old 04-10-2017, 07:46 AM
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As above...and yes, the valve blocks can be rebuilt with new o rings.
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Old 04-10-2017, 06:43 PM
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Originally Posted by tusabes View Post
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.
This is the part that I've been incorrectly calling the pulsation dampener. I have a new sphere on order but I'm wondering if the pressure relief valve itself (Part #220-320-08-58) can be rebuilt in a similar fashion as the two main valve blocks. I've seen the threads on rebuilding the main valve blocks, but not this pressure relief valve. I just don't want to take the thing apart and risk ruining it for nothing.
Attached Thumbnails Pulsation Dampener Service-relief-valve.jpg  
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Old 04-10-2017, 07:47 PM
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Again , the pressure relief valve , and the sphere attached to it, are to reduce noise and vibration .if you had no problems with a humming noise or vibration you don't need to touch that valve

if you are getting a bouncy ride , it's much more likely to be the two accumulator spheres which are responsible for bouncy ride
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Old 04-10-2017, 08:01 PM
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I've got the accumulators on order too but I've always heard that they don't reduce bounce either; just take the strain of pressure spikes on bumps. Either way I'm replacing all three, so I'm hopefully the problem will be solved.
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Old 04-10-2017, 11:55 PM
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Originally Posted by dimnddavid View Post
I've got the accumulators on order too but I've always heard that they don't reduce bounce either; just take the strain of pressure spikes on bumps. Either way I'm replacing all three, so I'm hopefully the problem will be solved.
if you are doing everything do all 4 spheres , I listed the part numbers and location above
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Old 04-11-2017, 07:24 AM
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Good advice, thanks. I'm still curious if that pressure relief valve can be rebuilt just for future reference.
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