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  #1  
Old 06-11-2002, 09:47 PM
The Least of These
 
Join Date: Jun 2002
Location: Exton, PA
Posts: 559
Calling all experts - ASD help please

So far I have managed to stump the local MB know-it-all and the dealerships on this one...

I have a 92 300D 2.5 with ASD ( locking differential ). There is a fluid management unit of some sort that sits infront of the passenger rear wheel. It makes a click-click sound every few seconds. Over the past 2k miles is has been getting loader. There is a high pressure line that runs from the power steering reservoir over the radiator which pulsates with the clicking. What could be the problem? Any thoughts are appreciated
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  #2  
Old 03-09-2013, 02:45 PM
Registered User
 
Join Date: Jun 2012
Location: Aarhus, Denmark
Posts: 14
Quote:
Originally Posted by slowmoe View Post
So far I have managed to stump the local MB know-it-all and the dealerships on this one...

I have a 92 300D 2.5 with ASD ( locking differential ). There is a fluid management unit of some sort that sits infront of the passenger rear wheel. It makes a click-click sound every few seconds. Over the past 2k miles is has been getting loader. There is a high pressure line that runs from the power steering reservoir over the radiator which pulsates with the clicking. What could be the problem? Any thoughts are appreciated

Have had that very problem since I bought my car 4 years ago.
Pulling my hair to find the cause.
Most likely it is the Hydraulic Unit charge valve, or the pressure sphere. If i disconnect the return line called T at the fluid recevoir, I can see the fluid moving back and forth with the sound, due to some pressure pulse in the unit.

Did you ever solve the mystery?

/Viggo
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  #3  
Old 03-09-2013, 03:27 PM
Starstruck
 
Join Date: Mar 2009
Location: Iceland
Posts: 423
I think this is caused by a faulty pressure valve, the pulse is the overpressure checkvalve opening.
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600SEL '91
300E 4Matic '88
240D '83
280SE '77
350SE '73
The most complex systems can fail in the simplest way.
Contra verbosus noli contendere verbis, sermo datur cunctis, animi sapientia paucis.

i don't believe in the lord! He's never bought me a Mercedes Benz.
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  #4  
Old 03-10-2013, 12:03 PM
Registered User
 
Join Date: Oct 2004
Posts: 2,886
I would start with the accumulator sphere. It is normal for the pressure release valve to open but without the sphere to dampen it you get the hard pulsation.
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90 300TE 4-Matic

Turbo 103 4-Matic, 3 cam advance
11-18 PSI, A2W I/C, 40 LB/HR
MS II Extra, 60-2 Direct Coil Control
3" Exhaust, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Brake Discs, .034 Booster.
3.07 Front and Rear Diff, 1st Gear Start

91 300CE parting

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197 intake cam w/20 advancer
4 ignition advance
PCS TCM2000 running 722.6 trans, 600W PWM fan, water injection
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