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Cat 3126B Propulsion

Product catalog summary

Specifications
The document outlines the specifications of the Caterpillar 3126B Marine Engine, a 6-cylinder, 4-stroke-cycle diesel engine. It is IMO compliant with a displacement of 7.2 liters (442 cubic inches), a bore of 110 mm (4.33 inches), and a stroke of 127 mm (5.0 inches). The engine is turbocharged and aftercooled, featuring an electronic governor and a net dry weight of approximately 809 kg (1782 lbs).

Standard Equipment
The engine includes a sea water aftercooler, a 12-volt air inlet heater, and an air cleaner with fumes disposal. The charging system features a 12-volt, 51 amp alternator. The cooling system is gear-driven with an auxiliary sea water pump and a belt-driven centrifugal jacket water pump. The exhaust system is water-cooled, and the fuel system includes a hydraulically actuated, electronically controlled unit injector.

Accessory Equipment
Available accessories include a 12V 110 Amp alternator, coolant level sensor, coolant recovery tank, engine monitoring system, GPS interface module, and a marine power display system.

Performance Curves
The engine is rated for heavy-duty service in vessels like freighters and tugboats, with typical hours per year ranging from 5000 to 8000. It can operate at rated speed up to 100% of the time with a load factor between 80 to 100%.

Dimensions
The engine's overall dimensions are 1580.7 mm in length, 917.1 mm in height, and 889.9 mm in width, providing detailed measurements for installation purposes.

Performance Data
The engine delivers 186 kW (250 hp) at 2400 rpm, with a torque of 742 N•m (547 lb ft). The brake specific fuel consumption (BSFC) is 220.0 g/kW-hr (.362 lb/hp-hr), and the fuel rate is 48.9 L/hr (12.9 gph).

Rating Definitions and Conditions
Power ratings are based on NMMA procedures as crankshaft power, with a 3% reduction for propeller shaft power. Conditions for power ratings include ambient temperature and fuel specifications.

Additional Information
The document includes performance data for different engine speeds and load factors, as well as information on accessory equipment available for the engine. It also notes that materials and specifications are subject to change without notice.

Catalog excerpts

Accessory Equipment STANDARD EQUIPMENT_ Sea water aftercooler, 12-volt air inlet heater, air cleaner with fumes disposal (closed system) Charging System Cooling System Gear-driven auxiliary sea water pump, belt-driven centrifugal jacket water pump, auxiliary sea water lines, expansion tank, transmission oil cooler, engine-mounted heat exchanger with removable tube bundle and replaceable copper-nickel tubes Exhaust System Watercooled exhaust manifold and turbocharger, fumes disposal routed to turbocharger inlet Flywheel and Flywheel Housing Fuel System Fuel priming pump, fuel filter — RH or LH service Lube System Crankcase breather; oil filter; oil level gauge, oil filler, oil pan drain — RH or LH service; gear-driven Mounting System Front mount is not included (Do not use shipping mounts in permanent installation.) Protection System Electronic overspeed shutoff Starting System Rear-facing 12-volt electric starting motor Vibration damper and guard. Caterpillar yellow paint, lifting eyes Engine Weight, Net Dry (approx)____ 822 kg (1812 lb) ACCESSORY EQUIPMENT Coolant Level Sensor Coolant Recovery Tank Crankshaft Pulley Engine Monitoring System Engine-to-Engine Wiring Harness Engine Vision Display System Flexible Fuel Lines Front Engine Support Front-Facing Electric Starting Motor Fuel Cooler Fuel Temperature Sensor Manual Sump Pump Marine Power Display System Pilot House Instrument Panel SAE No. 2 Flywheel and Flywheel Housing Throttle Position Sensor Transmission Alarm Contactor Watercooled Exhaust Elbow Vibration Isolators

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PERFORMANCE CURVES Maximum Power - Prop Demand Performance Data Cubic prop demand curve with 3.0 exponent for displacement hulls only. Maximum Power - Prop Demand Performance Data Power produced at the flywheel will be within standard tolerances up to 50°C (122°F) combustion air temperature measured at the air cleaner inlet, and fuel temperature up to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure as crankshaft power. Reduce crankshaft power by 3% for propeller shaft power. PD-DM7370-00.pdf Created on 12/17/2001 10:18 ©2001 Caterpillar All Rights...

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Right Side Overall Length Length from front to rear face of block Length from rear face of block to back of flywheel housing Overall Height Height from crankshaft centerline to top of engine Height from crankshaft centerline to bottom of oil pan Overall Width Width from crankshaft centerline to port side (left side) Width from crankshaft centerline to starboard side (right side) Customer mounting hole diameter** Width from crankshaft centerline to side** Length from rear face of block to front** •Illustrations and dimensions from drawing: 175-7032 "With optional front engine support RATING DEFINITIONS...

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Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposes of comparison with other manufacturers' engines. Actual engine performance may vary according to the particular application of the engine and operating conditions beyond Caterpillar's control. Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

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PERFORMANCE CURVES Maximum Power - Prop Demand Performance Data Cubic prop demand curve with 3.0 exponent for displacement hulls only. Maximum Power - Prop Demand Performance Data Power produced at the flywheel will be within standard tolerances up to 50°C (122°F) combustion air temperature measured at the air cleaner inlet, and fuel temperature up to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure as crankshaft power. Reduce crankshaft power by 3% for propeller shaft power. PD-DM7371-00.pdf Created on 12/17/2001 10:18 ©2001 Caterpillar All Rights...

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