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Since we are ranging far and wide in this thread..
let me point out that in the old days doing a rebuild on an engine involved AS STANDARD PROCEDURE Vatting it... hot caustic fluid ... then cleaning that off...
All plugs were taken out of the engine first... including the ' freeze plugs'....
This allowed all that crud which accumulates at the place farthest from the water pump where the flow slows down and makes turns to be gotten out... this is in the coolant jacket at the lowest area towards the back of the car...
This seldom happens to our old MB engines as far as I can tell from the descriptions of overhaul jobs... they are heavy... and it just does not happen often.. so many people wind up with what they think of as new engines... but which do not cool as they should... they blame all sorts of other things thinking the parts which were rebuilt or the way they were adjusted is the problem... when it was just not going deep enough with the cleaning process before starting back up..
So at the very least... if you have a chance... take off the freeze plugs.... find a power washer and a shop vac which can pick up liquids... and do a power wash down in that cavity... it will probably take a bent nozzle...and a bent pickup on the vacuum..
you can not just power wash because the water will fill up almost instantly and you will not get the power effect to loosen that sediment... unless you keep the ' used' water pulled out with the vacuum....
Remember that cleaning the oil passages to the oil squirters on turbo engines can only be done by taking out the sealing balls in the back of the engine and running a cleaning rod into them...
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