Cummins QSB4.5 Auxiliary Trawler Inboard Marine Diesel Engine

Description

Long-range trawler skippers face hydraulic failure or total blackout risks when main propulsion engines shut down offshore. The Cummins QSB4.5 Auxiliary Marine Diesel Engine supplies 110BHP continuous power at 1,800 RPM to run hydraulic thrusters and emergency wing drives. This 4.5L 4-Cylinder common rail unit requires clean 24V bus power, eliminating erratic voltage spikes from ungrounded trawler winches.

Heavy-duty pearlitic cast iron forms the parent-bore 4-Cylinder block and single-piece 16-Valve cylinder head to withstand continuous auxiliary generator loads. Dry engine weight without transmission measures 818 lbs inside an installation stance of 34in length by 27in width and 34in height. A 2.91 gallon cast aluminum oil pan combines with a 24V isolated ground 4.5 kW starter and 70A Delco Remy alternator engineered for non-stop ocean passage duty.

Key Features of Cummins QSB4.5 Auxiliary

Trawler operators buy Cummins QSB4.5 auxiliary engines to drive massive hydraulic pumps and auxiliary get-home propulsion shafts. Commercial marine pricing includes an SAE 3 bellhousing that bolts to commercial pump splitters or marine reverse gearboxes.

• Bosch high-pressure common rail injection meters fuel with precise atomization at a low 1,800 RPM continuous operating speed.
• A 110BHP continuous output rating drives heavy hydraulic pumps, refrigeration compressors, and auxiliary alternators.
• The standard SAE 3 flywheel housing connects to Twin Disc gears or front-mounted hydraulic pump pads.
• Keel-cooled plumbing with an expansion tank eliminates raw seawater intake clogging during ocean crossings.
• Single-piece 16-Valve cylinder heads enhance charge-air swirl to reduce fuel consumption on extended passages.
• Isolated ground 24V electrical architecture stops galvanic stray currents on metal vessel bulkheads.
• Electronic ECM governor control prevents engine droop when high-tonnage deck winches engage under load.

Auxiliary Generator Dyno Load Output

Dynamometer testing at 1,800 RPM continuous auxiliary rating confirms 320 ft-lbs of steady shaft torque without turbo lag. Bosch common rail pressure maintains 1,400 bar, keeping exhaust gas temperatures under 810°F during 24-Hour continuous factory load runs. Coolant circulation through the 3.96 gallon internal jacket holds block temperature at 178°F under full hydraulic load absorption. Crankshaft journal runout measures under 0.0006in TIR, preventing bottom-end bearing distress when driving heavy side-load belts or multi-pad hydraulic pump splitters on ocean voyages.

Trawler Engine Room Service Guidelines

Compact bobtail dimensions allow installation inside narrow outboard machinery flats, giving mechanics clear hand access to top-mounted fuel filters. Do not install this auxiliary common rail diesel in wet open cockpits without protective engine room bulkheads or on vessels lacking multi-stage fuel filtration.

• Drain the 2.91 gallon cast aluminum oil sump and install fresh filters every 250 operating hours.
• Replace the primary 2-micron fuel water separator and secondary fuel filter every 250 run hours.
• Inspect keel-cooler expansion tank levels and pressure caps every 500 hours or 12 service months.

Commercial Warranty Factory Crate Manifest

Cummins Marine protects this auxiliary trawler engine with a 2-Year or 2,000-Hour commercial warranty. The factory export pallet holds the bare QSB4.5 engine, ECM unit, 24V 4.5 kW starter, 70A alternator, SAE 3 housing, SAE 11.5 flywheel, engine harness, and an English technical workshop manual.