Cummins QSB4.5 200HP Inboard Diesel Engine

Description

A high-pressure common rail injection pump supplies 200HP of clean propulsion to move fast patrol craft and workboats. The Cummins QSB4.5 200HP Inboard Diesel Engine generates high continuous output from a compact 4.5L 4-Cylinder block. This electronically governed marine diesel relies on ECM calibration, requiring stable electrical voltage and clean fuel filtration rather than mechanical adjustments.

Heavy gray cast iron forms the parent-bore 4-Cylinder block and cylinder head to handle peak 200HP combustion pressures. Total dry engine weight registers at 977 lbs within an installation stance measuring 34in long by 28in wide and 32in high. A 107mm bore and 124mm stroke provide outstanding torque density, paired with an isolated ground 12V electrical setup and connections for either keel cooling or raw water heat exchangers.

Key Features of Cummins QSB4.5 200HP

Commercial fleet operators buy Cummins QSB4.5 200HP engines to repower fast pilot vessels, passenger tenders, and patrol boats. Competitive commercial pricing ensures lower total cost of ownership through high fuel economy and digital telemetry integration.

• The 200HP power rating provides maximum speed performance from a lightweight 4.5L displacement block.
• High-pressure common rail injection minimizes exhaust smoke and cuts fuel consumption at cruising speeds.
• Advanced ECM electronic controls adjust fuel timing across all engine load bands.
• Turbocharging combined with sea-water charge-air aftercooling stabilizes intake manifold air temperatures.
• Standard marine bellhousing patterns mate to ZF, Twin Disc, or PRM reverse-reduction transmissions.
• Dual cooling options allow seamless integration with closed keel coolers or standard heat exchangers.
• Compact 4-Cylinder dimensions fit tight bilge stringers without requiring major engine room structural alterations.

Full Power Dyno Boost Data

Dynamometer testing under full 200HP load at 2,800 RPM measures 415 ft-lbs of maximum torque with turbo boost stabilizing at 1.6 bar. Common rail pressure holds rock-steady at 1,650 bar across all electronic fuel injectors, keeping exhaust stack temperatures below 930°F before entering the water-jacketed turbine housing. The aftercooler drops intake air heat to 115°F during 4-Hour full-throttle trials. Engine lube oil pressure stays firm at 55 PSI through the oil pan, with zero oil bypass detected around the piston compression rings.

Patrol Boat Operation Maintenance Routine

Electronic fly-by-wire helm levers eliminate mechanical cable friction, providing effortless fingertip control during high-speed intercept maneuvers. Do not install this 200HP high-output common rail diesel in primitive workboats with substandard wiring or unfiltered fuel tanks containing water sediment.

• Drain the lube oil sump and spin on new oil filters every 250 engine hours.
• Replace the primary 2-micron fuel water separator and secondary filter every 250 operating hours.
• Inspect heat exchanger tubes and replace sacrificial zinc pencil anodes every 500 service hours.

Factory Commercial Warranty Crate Contents

Cummins Marine covers this 200HP inboard engine with a 2-Year commercial limited warranty. The wooden export crate contains the brand-new Cummins QSB4.5 200HP engine, ECM module, 12V starter, 105A alternator, flexible isolator mounts, engine monitoring harness, oil pressure senders, and the comprehensive Cummins factory service manual.