FPT N67-450 High-Performance Bobtail Inboard Marine Diesel Engine

Description

A rated 450 BHP output at 3,000 RPM drives offshore pilot boats onto plane without hesitation. The FPT N67-450 High-Performance Diesel Engine packages 6.7L of turbocharged Inline-6 displacement inside a 1,345 lbs dry envelope. High boost levels demand clean seawater strainers to prevent charge air cooler heat build-up that causes automatic engine ECU torque derating.

Engineers cast the monobloc 24-Valve cylinder head and parent-bore engine block from pearlitic gray iron to maintain cylinder sealing under high turbo boost. A single overhead camshaft actuates four valves per cylinder through rigid roller rocker arms. The 12V negative ground electrical loop includes a 12V 3.0 kW starter and 12V 90A marine alternator. Dry weight reaches 1,345 lbs within an envelope of 42.9in length, 33.3in width, and 32.5in height with a 4.49 gal oil sump.

Key Features of FPT N67-450

Pilot associations buy FPT N67-450 marine diesel engines to power fast offshore interceptors and military patrol craft. The integrated SAE 3 bellhousing with SAE 11.5 flywheel connects to ZF 280A and Twin Disc MG-5065A marine down-angle gearboxes.

• Wastegate turbocharger generates immediate boost pressure to push heavy planing hulls onto plane.
• Seawater charge air aftercooler condenses intake air to protect exhaust valves from excessive heat.
• High-pressure common rail injection meters precise fuel quantities to cut soot during hard acceleration.
• Tubular heat exchanger circulates coolant through corrosion-resistant tubes to isolate raw seawater.
• Monobloc 24-Valve cylinder head design resists combustion deck distortion under peak cylinder pressures.
• Engine-driven raw water impeller pump provides high cooling flow at high shaft RPM.
• Rigid parent-bore engine block casting suppresses harmonic vibrations across vessel engine beds.

Dynamic Bench Load Tolerances

Dynamometer calibration confirms 300 BHP continuous output at 2,600 RPM and 450 BHP intermittent sprint power at 3,000 RPM. Peak shaft torque reaches 962 ft-lbs at 1,800 RPM, maintaining forceful acceleration across choppy waters. Common rail injection rail pressure operates at 1,600 bar, while exhaust temperatures hold below 1,120°F at full throttle. Heat exchanger circuits stabilize jacket coolant at 183°F under full thermal saturation. Crankshaft journal runout inspects at 0.0004in TIR, and the oil pan supports static vessel installation angles up to 20°.

Field Usability Maintenance Protocol

Electronic throttle levers transmit digital speed requests to the injection computer, eliminating mechanical push-pull cable friction, binding, and linkage play. Do not install this high-output 3,000 RPM sprint unit in continuous-duty commercial workboat diesel engine repower craft that push heavy sand barges or run continuous 24-Hour harbor towing operations.

• Drain 4.49 gal of crankcase oil and replace spin-on oil filter elements every 500 operating hours.
• Replace secondary 2-micron fuel filters and check primary water separator bowls every 300 run hours.
• Inspect seawater pump impellers and heat exchanger zinc anodes every 150 service hours.

Verified Warranty Crate Manifest

FPT Industrial backs this high-speed propulsion engine with a 2-Year or 3,000-Hour commercial warranty. Each shipping crate contains the complete N67-450 bobtail engine, SAE 3 housing, SAE 11.5 flywheel, 12V starter, 12V alternator, flexible engine mounts, wiring loom, instrument sensors, and factory service manuals to direct yard technicians.