7 engine weight ?

[Bob Culver]

My father was about 10 stone or less and routinely lifted engine out of RP without gearbox (and possibly no dyanamo) and I did the same when young. )i dont know if that is the cause of my now troublesome back or energetically rowing sea scout cutters 15 years ago when already ancient (many of the youths were shirkers and did not pull their weight; they reckoned motors had been invented to avoid such folly.) The awkward part is aligningthe spline on reassembly.