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The 3508B marine propulsion engine features ratings from 578 bkw (786 mhp) to 1118 bkw (1521 mhp). Highlights of this engine include the Advanced Diesel Engine Management System II, Control Monitoring Protection System, Customer Communication Module, and Digital Voltage Regulator. m

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Power Rating
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Power Range 775-1500 bhp (578-1118 bkW) 775-1500 bhp (578-1118 bkW)

Electric Unit Injector Fuel System

Electronic Unit Injector fuel system featuring 10-20 percent higher injection pressure than other 3500 Family engines

Caterpillar ADEM II Electronic Engine Control/Monitoring System

Caterpillar ADEM II Electronic Engine Control/Monitoring System that provides infinitely variable injection timing and a state-of-the-art monitoring and protection system with self-diagnosing electronic sensors

“Deep Crater/Low Crevice Volume” Two-Piece Articulated Piston Design

“Deep Crater/Low Crevice Volume” two-piece articulated piston design with forged steel crown and cast aluminum skirt that enhance combustion efficiency to provide improved fuel efficiency and lower levels of gaseous and visible emissions

Larger diameter Camshaft

Larger diameter (98 mm vs. 92 mm bore) camshaft for higher injection pressures, shorter injection durations, and less gear train torsional vibration

Fuel Injection System

Strengthened fuel injection actuation system and rear gear train to maintain reliability and durability while providing higher injection pressures

Center-Mounted Low Inertia Turbochargers

Center-mounted low inertia turbochargers (four on 3512B and 3516B; two on 3508B) on EPG models

Rear Mounted Turbochargers

Dual rear mounted turbochargers on all marine configurations

Separate Circuit or Sea Water Aftercooling

Separate circuit or sea water aftercooling to supply the optimum temperature air to the combustion chamber to reduce emissions and fuel consumption and maximize power output

Streamlined Intake and Exhaust Manifolds

Streamlined intake and exhaust manifolds to reduce parasitic pumping losses and increase combustion efficiency

Thermo-laminated heat shields

Thermo-laminated heat shields on all marine configurations to maintain surface temperatures below Marine Classification Society regulations and to retain more exhaust gas energy for increased turbocharger performance

Electronic instrument panel

Electronic instrument panel with eight analog gauges, 10 LEDs, and one LCD read-out to display engine operating conditions and fault codes

Pin-type connector for easy connection of Caterpillar Engine Technician electronic service tool

Pin-type connector for easy connection of Caterpillar Engine Technician electronic service tool which delivers superior diagnostic capability to determine exact causes of engine faults

Formed lastomeric Seals

Formed elastomeric seals replace gaskets on rocker arm bases eliminating gasket relaxation to maintain consistent dimensions for valve lash and injection settings and nuisance-type oil leaks.

Redesigned aftercooler-to-intake manifold joints

Redesigned aftercooler-to-intake manifold joints that use formed elastomeric seals and substantially fewer fasteners to give superior sealing characteristics and easier serviceability

3508B Standard Equipment

Fuel System
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  • Fuel filter, RH, with service indicators.
  • Fuel transfer pump.
  • Electronically controlled init injectors

3508B Optional Equipment

Charging System
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  • Battery Charger, 10 amp
  • Charging Alternators
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