Graham, you are not stirring the pot...
I have seen FSM's which stated how many Ft/lbs a newly rebuilt engine should require to turn over... meaning that if you got to that number and it was not moving you should check for something binding...
With something like 21 to 1 compression.... I am betting that spec you found is exceeded in turning over the engine..
Anyone thought of this from the other end ? Why did the Mercedes people writing the FSM SPECIFY using the crank bolt ? Why would they have not mentioned...given its handy location... using the ps nut ?
UNLESS there was some physics reason not to...
if it were not a taper fitting...there would be no good reason not to use it...
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