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These engines featured a very high power-density when compared to other contemporary diesel engines. Use of these vertical diesels greatly reduced submarine engine-room length compared to other type engines of the same horse-power.
Reliability and accessibility were the shortcomings of the design.
They leaked oil: the crank-shaft penetrates right down through the bottom of the oil sump, and if the sump seal leaked (as it often did), the black, hot goo would run down into the bottom mounted generator, shorting out the commutator elements.
Also -- making this machine an Engineer's nightmare when mounted in the tight confines of a submarines engine-room -- there were portions of the engine that simply were not accessible for maintenance or repair without a major strip-down. And these high-speed diesels beat themselves to death at a much quicker rate thant the more robustly built (and longer) Fairbanks&Morse and M.A.N submarine diesel engines typically used aboard WW-2 and post war American submarines.
Wow, your right they are big. I dont know what was available back in the 1940s but today we use diamond plate and the individual bumps are quite small compared to those big old things.
IT TAKES GREAT INTELLIGENCE TO FAKE SUCH STUPIDITY!
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