Cummins QSL9 Heavy Displacement Trawler Marine Diesel Engine

Description

Navigate remote ocean passages with the Cummins QSL9 Heavy Displacement Trawler Engine providing continuous shaft thrust. This inline 6-Cylinder 8.9L diesel produces 285 BHP continuous commercial power at 1,800 RPM. Keel-cooled grids protect internal cooling loops during polar voyages, though passage skippers must configure 2-micron primary filtration to stop abrasive bunker fuel from damaging Bosch common rail injectors.

Engineers cast the block from dense pearlitic gray iron and install targeted wet sleeve cylinder liners to control thermal expansion under continuous ocean loads. A single-piece 24-Valve cast iron head seals combustion chambers across all 6 cylinders. The 24V isolated ground electrical system features a 7.5 kW starter motor and 70A marine alternator. Dry mass totals 2,000 lbs inside an installation envelope measuring 58.6in length, 38.9in width, and 41.3in height, with a 7.0 US gal sump.

Key Features of Cummins QSL9 Heavy Displacement

Expedition yacht builders buy Cummins QSL9 Heavy Displacement Trawler engines for global passage-makers. This continuous-duty package lowers fuel consumption and maintains quiet operation across nonstop crossings.

• Continuous P1 rating produces 285 BHP at 1,800 RPM for unrestricted ocean passages.
• Keel-cooled closed grid system eliminates raw water impeller failures in open seas.
• Bosch common rail injection operates at 1,600 bar for soot-free stern operation.
• Dry marine exhaust architecture routes gas overhead to stop transom carbon staining.
• Targeted wet sleeve liners enable in-hull overhauls without removing the block.
• SAE 1 flywheel housing mates to Twin Disc MG-5091 and ZF 286A transmissions.
• Cast iron deep oil pan holds 7.0 US gal for safe lubrication in heavy rolls.
• EPA Marine Tier 3 compliance fulfills emissions mandates without exhaust urea fluid.

Trawler Engine Dynamometer Load Benchmarks

Dynamometer load testing confirms 285 BHP continuous commercial output at 1,800 RPM with 832 ft-lbs peak shaft torque. Turbocharger boost pressure stabilizes at 1.75 bar under continuous load while Bosch injection rail pressure holds steady at 1,600 bar. The keel-cooled closed cooling loop maintains jacket coolant at 180°F during extended continuous brake runs. Dry exhaust stack temperatures stabilize at 880°F at the manifold outlet pipe. Crankcase oil pressure tracks at 48 PSI at idle and reaches 68 PSI under rated cruising speeds.

Trawler Machinery Space Service Criteria

Wheelhouse electronic throttle stations wire through CAN bus connectors while emergency mechanical backup levers require 8 lbs of linear push-pull cable force. Do not mount this continuous trawler commercial workboat diesel engine repower package into lightweight planing hulls or high-speed skiffs that require 3,000 RPM sprint operations.

• Drain crankcase lube oil and replace spin-on filters every 250 operating hours.
• Replace primary and secondary 2-micron fuel filter cartridges every 500 operating hours.
• Inspect external keel cooler grid zinc anodes every 12 months for galvanic wear.

Factory Trawler Warranty Delivery Scope

Cummins covers this heavy displacement trawler engine with a 2-Year or 2,000-Hour factory warranty. Each wooden shipping crate contains the complete bobtail engine, 24V 7.5 kW starter motor, 70A marine alternator, steel flexible engine mounts, display wiring harness, oil pan drain valve, and official factory shop service manuals.