Medium-speed auxiliary diesel engine for ships (4 stroke, in-line type) FM/ALCO 251 F : 500 -> 730 kWe
Fairbanks Morse
The FM/ALCO 251 F engine is universally recognized for its great reliability, high specific output, and low specific fuel consumption. This rugged 4-stroke engine is available in 6-, 8-, 12-, 16-, and 18-cylinder configurations and provides 500 to 2810 kWe of power. All versions feature exceptional commonality of components with 229 mm (9 in) bore and 267 mm (10.5 in) stroke used throughout, forged alloy crankshaft with nitrided bearings, welded counterweights, fabricated steel cylinder block with redesigned camshaft bearing supports, and an under slung crankshaft that is carried in forged steel saddles. The latest version of the FM/ALCO 251 F engine incorporates performance improvements known as the Plus Package. The "Plus" configuration has been engineered utilizing years of actual field experience with the intent to reduce fuel consumption and improve reliability and durability.
