DETROIT GM 12V71 Marine Diesel Engine (287 kW / 385 HP)

The DETROIT GM 12V71 is a legendary marine diesel engine known for its durability, simplicity, and robust performance, making it a trusted choice for a wide range of marine applications. With a rated output of 287 kW (385 HP), this 12-cylinder V-type diesel engine delivers strong torque and reliable power for propulsion and auxiliary duty in commercial and workboat environments.

Built by Detroit Diesel (a division of General Motors), the 12V71 series has earned a reputation for rugged construction, ease of maintenance, and dependable service life, even under demanding operational conditions. Its two-stroke diesel design with a mechanically driven blower provides excellent low-end torque and quick throttle response — qualities appreciated by operators in fishing vessels, tugboats, barges, and coastal freighters.

The engine simple mechanical fuel system and robust components make it easy to service in the field, reducing downtime and lowering overall life-cycle costs. Detroit global support network ensures widespread availability of parts and knowledgeable service technicians, further enhancing operational readiness and minimizing maintenance challenges.

Whether used as a main propulsion engine or as a generator/auxiliary power source, the DETROIT GM 12V71 delivers reliable performance and proven longevity. Its balanced combination of power, simplicity, and serviceability has made it an enduring workhorse in the marine industry.

Specifications:

Engine Type: 12-cylinder, V-type, 2-stroke marine diesel engine
Model: 12V71
Rated Power Output: 287 kW (≈ 385 HP)
Rated Speed: Typically 1800 rpm (varies with marine rating)
Bore × Stroke: 110 mm × 127 mm (4.33 in × 5.00 in)
Total Displacement: 13.6 L (831 cu in)
Aspiration: Naturally aspirated or with optional turbocharger (model-dependent)
Fuel System: Mechanical fuel injection (unit injectors)
Cooling System: Freshwater cooling with heat exchanger (seawater loop)
Lubrication System: Forced lubrication with full-flow oil filter
Compression Ratio: Approx. 18.0 : 1 (varies with configuration)
Starting System: Electric starter motor (typically 24 V)
Governor: Mechanical governor
Flywheel Housing: SAE standard V-type housing
Dry Weight: Approx. 800 – 900 kg (engine only; depends on options)
Dimensions (Approx.):
- Length: ~1450 mm
- Width: ~1000 mm
- Height: ~1030 mm
Applications:
- Main propulsion for workboats, fishing vessels, tugboats
- Auxiliary power and generator sets
- Commercial and industrial marine applications