Mercedes-Benz Forum - View Single Post - 1991 350SD ASD Operation
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post #11 of (permalink) Old 04-05-2014, 09:39 AM
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In my case, it was the accumulator. Even at idle, it sounded as someone was taking a hammer to my car with the sound coming from behind the firewall on the driver's side. At speed, the sound was less obvious. Also noted, the ASD is pumped via a SLS pump thats exactly the same as the ones found on a 560. There are hoses that run from it. When the car was in idle, you can see the hoses react to the "knock" sound I was hearing coming from the ASD assembly.
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