Many years ago the 900cc engine in my then daily driver '57 DKW 3=6 got R & R'd barehanded. Was able to get everything off except the head before lifting it out while it was parked on a side street. Have no idea how heavy the block with pistons, rods, and crank plus head might have weighed, but I was only 165lbs and not muscular!! Oh well, what we do when young and ignorant.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150