Volvo Penta D6-340I Commercial Inboard Marine Diesel Engine

Description

Commercial launch skippers fight constant propeller drag when hauling full passenger loads across choppy coastal harbors. The Volvo Penta D6-340I Commercial Engine overcomes this resistance through a 5.5L 6-Cylinder design generating 340BHP at 3,100 RPM and 250BHP continuous at 2,800 RPM. Common-rail fuel delivery requires 2-micron filtration, and heavy cast iron mass demands stiff engine beds.

A parent bore high-grade cast iron block features an integral stiffening ladder frame to withstand heavy commercial shaft torques. The single-piece 24-Valve cast iron cylinder head contains dual overhead camshafts with direct valve actuation. Electrical circuits run on an isolated 12V marine ground with a 3.0 kW starter and a 12V 115A alternator. Physical dimensions span 45.3in long, 32.4in wide, and 30.7in high. Dry weight equals 1,279 lbs without gearbox. Oil pan capacity holds 5.28 US gal.

Key Features of Volvo Penta D6-340I

Commercial vessel captains buy Volvo Penta D6-340I commercial inboard engines to repower high-speed crew transfer craft and pilot launches. Fleet superintendents choose this package for commercial workboat diesel engine repower installations requiring continuous high-torque shaft rotation.

• Roots superchargers generate immediate manifold boost at low engine speeds to push heavy displacement hulls
• Turbochargers take over at cruise RPM to maintain sustained continuous horsepower under full commercial loads
• Common-rail fuel injection operates at 2,000 bar to optimize fuel economy and suppress smoke emissions
• Freshwater cooling passages protect the cast iron head from seawater scaling and salt encrustation
• Commercial EVC-2 electronics transmit throttle commands without mechanical push-pull cable slack or drag
• Flywheel housings mate directly to Volvo Penta HS85A, HS85IV, ZF 85A, or ZF 85IV transmissions
• Multi-groove serpentine belts maintain steady drive friction on the 12V 115A heavy-duty alternator

Bench Dynamometer Load Test Output

Dynamometer test runs verify 340BHP peak output at 3,100 RPM and 250BHP continuous output at 2,800 RPM under heavy commercial ratings. Compound boost pressure reaches 1.70 bar during full-power dyno runs. Freshwater heat exchangers hold engine core temperatures steady at 185°F under continuous thermal load. Engine lube oil pressure maintains 55 PSI across operating ranges. Shaftline installation permits up to 30° static inclination angles. Crankshaft journal runout remains below 0.0005in TIR to protect bearings against deflection fatigue. Exhaust temperatures stay below 1,260°F.

Field Operation Maintenance Service Rules

Electronic EVC-2 helm levers provide resistance-free throttle adjustments with under 2 lbs of lever resistance. Do not install this 5.5L high-boost engine in heavy slow-speed displacement push-boats or vessels operating in shallow mud without raw-water strainers. It requires clean marine gas oil and strictly maintained sacrificial zinc anodes to prevent galvanic damage.

• Drain engine oil and change spin-on oil filter cartridges every 200 operating hours
• Inspect raw water pump impellers and check heat exchanger zinc anodes every 150 hours
• Replace the primary 2-micron fuel water separator filter canister every 250 engine hours

Factory Warranty Shipment Parts Manifest

Volvo Penta provides a 2-Year commercial warranty backed by 3-Year major component structural coverage. The shipping crate contains the bobtail marine engine, 12V 115A alternator, 3.0 kW starter motor, four elastomeric vibration mounts, EVC wiring harness, oil pressure senders, and factory technical manuals.