At JB Marine Services, we specialize in Alco 251 diesel engine repairs, overhauls, and maintenance, delivering on-site services worldwide for marine, stationary, and rail applications. With over 40 years of experience and factory training, we provide expert solutions to keep your engines running at peak performance – no matter where you are in the world.

Our Services

Alco 251 Diesel Engine Overhauls

We offer complete engine overhauls to restore your Alco 251 engine to factory specifications. Whether a full strip-down or partial rebuild, our services include:

• Disassembly and inspection
• Cylinder head refurbishment
• Piston and liner replacement
• Crankshaft inspections
• Reassembly and testing

Cylinder Head Refurbishment

JB Marine Services provides cylinder head repair and reconditioning to extend the life of your Alco 251 engine. Our services include:

• Valve seat replacement
• Pressure testing
• Surface grinding
• Crack detection

Turbocharger Repairs

We carry out turbocharger inspections, repairs, and rebuilds, ensuring your engine operates at optimal power and efficiency.

Fuel Pump & Injector Services

Precision fuel delivery is critical to your engine’s performance. Our services include:

• Fuel pump calibration
• Injector cleaning and testing
• Replacement of worn parts

Emergency Breakdown Repairs

We understand that engine failures can happen at any time, in any location. That’s why we offer 24/7 emergency breakdown repairs, travelling to even the most remote locations to get your engine running again.