Help! 190E Knocking ASD sound?
 

I've got an annoyance with the car and can't seem to find out what it is nor can I find someone in person to figure out what could be the problem.

I've attached a picture of the "thing" thats causing a loud knocking sound with the hose pulsating as if it were a heart. I've used MSPaint to make two arrows showing what exactly is moving/knocking. It occurs once the car has been driven for a while and is fully warm. My guess its got something to do with ASD... but what and why? Any help/input is GREATLY appreciated.

The car in question is a 1991 190E 2.0 5-speed (Euro) tuned by AMG at Affalterbach. However, the part thats giving the problem has to be a standard mercedes part.
http://img130.imageshack.us/img130/3...ture309jp4.jpg

I don't have this car, but it looks like a water pump to me.

The throbbing would be some kind of issue with the impeller.

Does that one have SLS? I thought that was the SLS pump there on the front of the block. You lucky Euro folks get all the goodies. Well until it breaks.:D

As posted, the car has ASD and that hydraulic fluid tank is for the ASD. The car does not have SLS.

I don't think thats water pump related... the water pump is located on the right side(not in photo). Anyone know what the things pointed out with the red arrows/question marks are? :confused: