On 02/02/2018 4:41 PM, Curley McLain via Mercedes wrote:
I was trying to turn over an M116 this afternoon by hand. It seems to
be hitting something hard at about 180º from TDC on the crank. I took
loose the belts, and I don't see anything external that would
interfere with it turning over. That made no difference. If it was
an OM 621 or 61x, I'd say the end of a prechamber broke off and is
hitting the top of the piston as it approaches tdc. I suppose a spark
plug could break off, or something could be interfering with the
timing chain or one camshaft.
Have you heard it run or is this an engine in a derelict car that has
not run in a long while?
Are the spark plugs in it? Could a cylinder be full of coolant and
causing a hydraulic lock?
Where would you start looking?
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