I experienced three engine failures on the Convair 440 - never a problem with several years flying the Dakota. But many failures (usually blow backs on take off) with the Rolls Royce Merlins during the five years I operated those engines.
With the radials it was the generally accepted rule (you did what you were told) that the props had to be pulled through before start. The Convair needed three men and a dog to push the prop blades and I wonder now what damage may have been caused although I don't recall ever experiencing a hydraulic lock. It does bring up a question though. If you encounter a hydraulic lock, does that mean manual labour will not "break" the lock in a similar manner that the starter clutch will slip when the engine has a hydraulic lock? As a young pilot my knowledge was was lacking in those far off days especially as the internet had yet to be invented.