3512B Commercial Marine Propulsion Engine

Specifications

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Overview

The Cat 3512B marine propulsion engine includes the Advanced Diesel Engine Management System II, Control Monitoring Protection System, Customer Communication Module, and Digital Voltage Regulator. Benefits include improved fuel economy, reduced visible and gaseous emissions, enhanced diagnostic and monitoring capabilities, and increased rated output with no reduction in reliability.

Power Rating

Power Range 1100-2250 bhp (820-1678 bkW) 1100-2250 bhp (820-1678 bkW)

Engine Specifications

Speed Range 1200-1925 rpm 1200-1925 rpm
Emissions IMO I IMO I
Aspiration TTA TTA
Bore 6.7 in 170.0 mm
Stroke 7.5 in 190.0 mm
Displacement 3158.0 in³ 51.8 l
Rotation from Flywheel End Counterclockwise or Clockwise Counterclockwise or Clockwise
Configuration Vee 12, 4-Stroke-Cycle Diesel Vee 12, 4-Stroke-Cycle Diesel

Dimensions & Weights

Minimum Dry Weight 14411.0 lb 6537.0 kg
Minimum Length 111.0 in 2819.0 mm
Maximum Length 3067.0 in 121.0 mm
Minimum Height 71.1 in 1806.0 mm
Maximum Height 82.3 in 2091.0 mm
Minimum Width 67.1 in 1703.0 mm
Maximum Width 70.2 in 1785.0 mm
Maximum Dry Weight 14411.0 lb 6537.0 kg

Benefits & Features

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

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

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

Dual rear mounted turbochargers on all marine configurations

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 to reduce parasitic pumping losses and increase combustion efficiency

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 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 which delivers superior diagnostic capability to determine exact causes of engine faults

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 that use formed elastomeric seals and substantially fewer fasteners to give superior sealing characteristics and easier serviceability

Equipment

3512B Standard Equipment

Air Inlet System

regular duty air cleaners, dual turbochargers, 152 mm (6 in) OD straight connection, corrosion resistant coated separate circuit aftercooler core

Control System

dual Advanced Diesel Engine Management (ADEM II) modules with electronically controlled unit injectors

Exhaust System

dry gas-tight exhaust manifolds with thermolaminated heat shields, dual turbochargers with watercooled bearings and thermo-laminated heat shields, vertical exhaust outlet, 203 mm (8 in) ID round flanged outlet

Fuel System

electronically controlled unit injectors, RH fuel filter with service indicators, fuel transfer pump

Instrumentation

RH electronic instrument panel with analog gauges and digital display of data for: oil and fuel pressure, oil and fuel filter differential, system DC voltage, exhaust and water temperature, air inlet restriction; digital display only for: tachometer, service meter, fuel consumption (total and instantaneous); start/stop switch

Lube System

top mounted crankcase breather, deep sump oil pan, RH oil filler and dipstick, RH oil filter, gear type oil pump

Mounting System

ledge type engine length rails, 203 x 203 mm (8 x 8 in)

Power Takeoffs

accessory drive on standard rotation engines: lower RH, lower LH; on opposite rotation engines: upper and lower RH and upper and lower LH; twosided front housing

Protection System

ADEM II Electronic Monitoring System with customer programmable alarm, shutdown, and deration strategies; emergency stop pushbutton

General

front and rear lifting eyes, Caterpillar yellow paint, vibration damper and guard

Flywheel and Flywheel Housing

SAE No. 00 flywheel (183 teeth) and SAE No. 00 flywheel housing

Cooling System

auxiliary fresh water pump on SCAC engines, non-self-priming centrifugal auxiliary sea water pump for heat exchanger engines only, expansion tank, gear-driven centrifugal jacket water pump, oil cooler, keel cooling connections for keel cooled engines, thermostats and housing with 92° C (198° F) full open temperature

3512B Optional Equipment

AIR INLET SYSTEM

Air Cleaner Removal
Remote Air Inlet Adapters

CHARGING SYSTEM

Battery Chargers
Charging Alternators

CONTROL SYSTEM

Throttle Position Sensor
Throttle synchronization

COOLING SYSTEM

Water level switch gauge
Coolant level sensors
Connections
Keel cooling conversions
Heat exchangers
Auxiliary water pumps
Sea water pump removal
Coolant shunt tanks
Air separator
Marine gear cooling

EXHAUST SYSTEM

Horizontal Exhaust Outlet
Flexible fittings
Elbows
Flanges
Flange and exhaust expanders
Mufflers

FUEL SYSTEM

Fuel Cooler
Fuel priming pumps
Flexible fuel lines
Rigid Fuel Lines
Primary fuel filter
Fuel level switch

INSTRUMENTATION

PL1000T Communication Module
PL1000E Communication Module
Customer Interface Box
Thermocouples
Remote panel display
Remote cylinder temperature display
Pilot house instrument panels
Marine gear sensors
Engine vision display system

LUBE SYSTEM

Oil Pan
Oil Pan Accessories
Sump Pumps
Prelubrication Options
Lubricating Oil
Lube System

MOUNTING SYSTEM

Engine supports
Vibration Isolation Mountings

POWER TAKE-OFFS

Flexible coupling and guards
Upper left hand front location:
Upper right hand front location:
Upper right hand rear location:
Lower left hand front location:
Lower left hand rear location:
Front housing accessory drives
UPPER LH ACCESSORY DRIVE
UPPER RH ACCESSORY DRIVE
Front power take offs
Crankshaft pulleys
Damper guard removals

PROTECTION SYSTEM

Air inlet shutoffs
Switches and contactors
Explosion relief valve
Sensors

SPECIAL APPEARANCE

Chrome Plated Relief Valves
Black Air Cleaners

STARTING SYSTEM

Starting motors or barring device
Air starting motor options:
Starting aids
Battery sets - 24 volt - Dry
Battery rack

GENERAL

Tool set
Caterpillar Datalink wire

3512B