Volvo Penta D2-75 Bobtail Inboard Marine Diesel Engine

Description

Need continuous high torque to push heavy steel hulls through ocean currents without electronic sensor failures? The Volvo Penta D2-75 Bobtail Diesel generates 75BHP at 3,000 RPM from a compact 4-Cylinder 2.2L engine architecture. Mechanical injection pumps ensure total off-grid reliability. Operating under high boost requires strict raw seawater circuit flushes every 250 operating hours.

Pearlitic gray cast iron constructs the parent-bore cylinder block and rigid overhead-valve cylinder head. The marine electrical system features a 12V negative ground configuration, running a 12V 2.0 kW heavy starter and a high-amp 12V 115A alternator with internal temperature sensing. Dry mass measures 507 lbs excluding transmission oil. The mounting envelope measures 28.3in length, 21.4in width, and 24.0in height, holding 1.72 US gal engine oil in the stamped pan.

Key Features of Volvo Penta D2-75

Commercial operators buy Volvo Penta D2-75 bobtail diesel units to configure customized marine reduction gears in displacement hulls. This turbocharged commercial engine powers steel Dutch barges, pilot vessels, and heavy cruising sloops.

• Matched turbocharger supplies dense boost pressure into combustion chambers for 75BHP peak propulsion power.
• High-efficiency charge-air cooler cools compressed induction air to optimize diesel fuel combustion cycles.
• Mechanical unit injection pumps deliver uniform fuel volume to all cylinders without electronic controllers.
• Standardized flywheel housing mates with Volvo Penta MS25, HS25A, and ZF marine gearbox adapters.
• Acoustic air intake silencer removes high-pitch turbo whistle inside enclosed vessel engine compartments.
• Heavy parent-bore cylinder casting resists wall flexing under sustained continuous commercial workboat duty.
• EPA Tier 3 certification ensures full compliance with international marine exhaust emissions regulations.

Bench Dyno Output Tolerances

Dynamometer continuous loading validates 69BHP at 2,800 RPM and 75BHP intermittent power at 3,000 RPM. Manifold pressure registers 1.25 bar boost under full fuel rack position. Exhaust pyrometer temperatures hold steady at 980°F upstream of the water injection elbow. Crankshaft journal runout maintains 0.0005in TIR along precision-ground bearing surfaces. Oil pressure registers 62 PSI at 185°F freshwater operating temperature. Static inclination allowances permit operating angles up to 30° without risk of oil pump aeration during violent vessel pitch motions.

Field Operation Maintenance Service Schedule

Mechanical governor levers require 8 lbs actuation pull force for smooth throttle adjustments on commercial helms. Workboat operators select this bare bobtail engine for custom shaft installations, but mechanics must not install this high-boost diesel engine in ultra-light skiffs, shallow-draft river punts, or engine spaces with unventilated engine room air boxes.

• Clean charge-air cooler core tubes and check zinc anodes every 250 operating hours.
• Drain crankcase lubricant and install fresh oil filter canisters every 200 run hours.
• Inspect seawater pump neoprene impellers and check belt deflection every 500 operating hours.

Factory Warranty Crate Manifest Specifications

Factory terms provide a 2-Year limited warranty accompanied by an additional 3-Year major component structural casting protection plan. The shipping crate contains the D2-75 bobtail engine, flywheel damper plate, 12V 115A alternator, 12V starter, four adjustable engine mount brackets, instrument wiring harness, and factory workshop operating manuals.