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#1
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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 |
#2
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Quote:
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 |
#3
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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. |
#4
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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-M Turbo 103, T3/T04E 50 trim T04B cover .60 AR Stage 3 turbine .63 AR A2W I/C, 40 LB/HR MS2E, 60-2 Direct Coil Control 3" Exh, AEM W/B O2 Underdrive Alt. and P/S Pulleys, Vented Rear Discs, .034 Booster. 3.07 diffs 1st Gear Start 90 300CE 104.980 Milled & ported head, 10.3:1 compression 197° intake cam w/20° advancer Tuned CIS ECU 4° ignition advance PCS TCM2000, built 722.6 600W networked suction fan Sportline sway bars V8 rear subframe, Quaife ATB 3.06 diff |
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