Why only Volvo vs Lehman?
Yanmar is probably the best boating engine. But maybe not for slow trawlers.
Lehman lasts forever, and should only be replaced by other similar engines. RPM up to 2500 and slow cruising will keep any engine alive for decades!
Faster engines wear considerably more than these, and should not be directly compared...
My trawler has the original Lehman engine from 1980, and it runs like clockwork!
The sparepart market is obviously different in Europe than in the US. Volvo parts is found in any city and even in small marinas, whilst parts for Ford must be ordered.
Still I will never toss out the Lehman! First of all because it runs so well, but also because of all the other gear that will need to be replaced with a faster running engine. And ofcourse, the trawler is buildt for low cruising speed.
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