Caterpillar 3126B Marine Engine Propulsion Info
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optional attachments.
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.
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.
Specifications
I-6, 4-Stroke-Cycle-Diesel
Standard Equipment
- Air Inlet
- Sea water aftercooler, 12-volt air inlet heater, air cleaner with fumes disposal (closed system)
- Charging System
- 12-volt 51 amp alternator
- 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
- SAE No. 3 (126 teeth)
- 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 engine oil pump
- 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
- General
- Vibration damper and guard, Caterpillar yellow paint, lifting eyes
Accessory Equipment
- 12V 110 Amp Alternator
- Coolant Level Sensor
- Coolant Recovery Tank
- Crankshaft Pulley
- Cruise Kit
- 12V/24V DC Converter
- Dress-Up Kit
- Dry Exhaust Elbow
- 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
- GPS Interface Module
- Manual Sump Pump
- Marine Power Display System
- OEM Wiring Harness
- Pilot House Instrument Panel
- SAE No. 2 Flywheel and Flywheel Housing
- Spare Parts Kit
- Throttle Position Sensor
- Transmission Alarm Contactor
- Watercooled Exhaust Elbow
- Vibration Isolators
Dimensions
**With optional front engine support
Available Configurations for Various Applications
General Engine Performance Parameters
Ratings are based on SAE J1228/ISO8665 standard conditions of 100 kPa (29.61 in. Hg), 25°C (77°F), and 30% relative humidity. These ratings also apply at ISO3046/1, DIN6271/3, and BS5514 conditions of 100 kPa (29.61 in. Hg), 27°C (81°F), and 60% relative humidity.
Fuel rates are based on fuel oil of 35° API [16°C (60°F)] gravity having an LHV of 42 780 kJ/kg (18,390 Btu/lb) when used at 29°C (85°F) and weighing 838.9 g/L (7.001 lb/U.S. gal).
Additional ratings may be available for specific customer requirements. Consult your Caterpillar representative for additional information.
A Rating - 186 bkW (250 bhp) 254 mhp @ 2400 rpm
Typical Application . . . For heavy-duty service in vessels such as freighters, tugboats, bottom drag twawlers, and deep river towboats where the engine is operated at rated load and speed up to 100% of the time without interruption or load cycling.
B Rating - 205 bkW (275 bhp) 279 mhp @ 2400 rpm
Typical Application . . . Vessels such as midwater trawlers, purse seiners, crew and supply boats, ferries, and towboats where locks, sandbars, and curves dictate frequent slowing, and engine load and speed are constant with some cycling.
C Rating - 235 bkW (315 bhp) 319 mhp @ 2400 rpm
Typical Application . . . Vessels such as ferries, harbor tugs, fishing boats moving at higher speeds out and back (e.g. lobster, crayfish, and tuna), offshore service boats, and displacement hull yachts and short trip coastal freighters where engine load and speed are cyclical.
D Rating - 276 bkW (370 bhp) 375 mhp @ 2400 rpm
- % Load Factor: up to 50
- % Time at Rated RPM: up to 16
- Typical Time at Full Load: 2 hours out of 12
- Typical Hour/Year: 1000 to 3000
- Typical Applications: Planing hull vessels such as off- shore patrol boats, customs, police, and some fire boats. Also used for bow and stern thrusters.
Power at declared engine speed is in accordance with ISO8665. Caterpillar maintains ISO9000 approved engine test facilities to assure accurate calibration of test equipment. Electronically controlled engines are set at the factory at the advertised power corrected to standard ambient conditions. The published fuel consumption rates are in accordance with ISO3046-1.
Fuel rates are based on fuel oil of 35° API [16°C (60°F)] gravity having an LHV of 42 780 kJ/kg (18,390 Btu/lb) when used at 29°C (85°F) and weighing 838.9 g/L (7.001 lb/U.S. gal). Additional ratings may be available for specific customer requirements. Consult your Caterpillar representative for additional information.
E Rating - 313 bkW (420 bhp) 426 mhp @ 2800 rpm
Typical Application . . . Planing hull vessels such as pleasure craft, harbor patrol, harbor master, and some fishing and pilot boats.
E Rating - 336 bkW (450 bhp) 456 mhp @ 2800 rpm
Planing hull vessels such as pleasure craft, harbor patrol, harbor master, and some fishing and pilot boats.