FM/ALCO 251 F
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.
Engine Dimensions (mm) and Ratings (kW)
Engine Data - Generator Power
Engine Data - Marine Power
Drawings are for illustration only. For installation obtain certified prints. All ratings subject to factory approved application and are subject to change without notice.
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Engine Data - Generator Power
| Cylinder Bore - mm (in) | - | 229 (9.0) |
| Piston Stroke - mm (in) | - | 267 (10.5) |
| Cycle | - | 4 Stroke |
| Displacement / Cylinder - L (cu in) | - | 10.9 (668) |
| Aspiration | - | Turbocharged - Aftercooled |
| Rotation | - | CCW or CW |
| Mean Piston Speed - m/s (ft/s) | - | 6.7 - 10.6 (21.8 - 35.0) |
| BMEP - bar (psi) | ||
| -- Continuous | - | 12.7 - 17.9 (185 - 260) |
| -- Standby | - | 14.4 - 19.4 (210 - 282) |
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All Ratings subject to factory approved application. Ratings are based on: 90 degree F (32.2 degree C) ambient temp. 28.25 in Hg. (71.6 cm Hg) barometric pressure (min) 1500 ft. (457 m) altitude (max) Standby ratings available The kWe ratings are based on generators with nominal efficiencies of 95.5%. For installations obtain certified prints. |
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Engine Data - Marine Power
| Cylinder Bore - mm (in) | - | 229 (9.0) |
| Piston Stroke - mm (in) | - | 267 (10.5) |
| Cycle | - | 4 Stroke |
| Displacement / Cylinder - L (cu in) | - | 10.9 (668) |
| Aspiration | - | Turbocharged - Aftercooled |
| Rotation | - | CCW or CW |
| Mean Piston Speed - m/s (ft/s) | - | 8.0 - 10.6 (26.2 - 35.0) |
| BMEP - bar (psi) | ||
| -- Continuous | - | 15.5 - 16.5 (225 - 240) |
| -- Standby | - | 16.9 - 18.2 (245 - 264) |
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All Ratings subject to factory approved application. Ratings are based on: 90 degree F (32.2 degree C) ambient temp. 28.25 in Hg. (71.6 cm Hg) barometric pressure (min) Overload ratings available For installations obtain certified prints. |
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The FM/ALCO 251 F "Plus" includes the following improvements:
- A stronger, more durable cylinder head casting increases the life of critical components such as valve seats and reduces thermal distortion and leaks.
- A new precision ground valve lever bushing that improves the reliability and service life of the valve train.
- A newly designed Super Bowl piston crown provides more thorough combustion and subsequent increased fuel efficiency. This provides a 11.5-to-1 compression ratio while using the same ring set and requires no change to the injection timing.
- A redesigned chrome pattern on the cylinder liner improves lubricity between the liner and piston and reduces lube oil consumption.
- Completely redesigned camshafts made of a stronger material to increase life. The new design also incorporates the "unit cam" concept, vastly improving maintainability by allowing replacement one cylinder at a time.
- Forged steel piston crowns are bolted to forged aluminum alloy piston bodies.
- Forged alloy crankshaft with nitrided bearings, welded counterweights. The under slung crankshaft is carried in forged steel saddles.
Aftermarket Parts and Service for your FM/ALCO 251 F
Only genuine Fairbanks Morse replacement parts and factory-direct field service can guarantee optimal performance for your FM/ALCO 251 F. With facilities located worldwide, Fairbanks Morse Engine provides around-the-clock OEM replacement parts and factory-direct field service to customers in every market.
Getting your genuine OEM replacement parts in time and on time is crucial to the continued smooth operation of your Fairbanks Morse engine. Give us a call and we will quickly supply whatever you need. Can you afford to risk engine performance and downtime by using non-OEM replacement parts? Not when everything you need is available from FME, delivering the highest quality at the right price.
For more information, please visit our comprehensive parts and service page.
Getting your genuine OEM replacement parts in time and on time is crucial to the continued smooth operation of your Fairbanks Morse engine. Give us a call and we will quickly supply whatever you need. Can you afford to risk engine performance and downtime by using non-OEM replacement parts? Not when everything you need is available from FME, delivering the highest quality at the right price.
For more information, please visit our comprehensive parts and service page.
