Marine Diesels After 30 Years: Lehman vs. Perkins vs. Cummins — A Clear Winner

Three engines powered almost every trawler built between the mid-seventies and the early nineties. After thirty years of overhaul bills, parts receipts, and owner logs from every waterway between the Gulf and the San Juans, one of them won. It was not the one with the best spec sheet. It was the one with a three-page maintenance notebook while the engine one dock over needed thirty. Perkins. Cummins. Ford Lehman. One leaks from birth. One carries a turbocharger that wants to work harder than a trawler will ever let it. One has no turbo, no computer, no electronics, just six cylinders and a mechanical fuel pump turning a prop at 1,500 RPM while the owner reads the tide chart. This is the ranking, the real ownership math behind each one, and the single detail in the engine room that is worth more than the hour meter and the survey combined.