Marine Propulsion Engine SPECIFICATIONS I-6, 4-Stroke-Cycle-Diesel Emissions ........................... IMO compliant Displacement ..................... 7.2 L (442 cu. in.) Bore ............................. 110 mm (4.33 in.) Stroke............................. 127 mm (5.0 in.) Aspiration ................ Turbocharged-Aftercooled Governor ................................ Electronic Engine Weight, Net Dry (approx) .... 822 kg (1812 lb) Capacity for Liquids Cooling System ............... 39 L (10.3 U.S. gal) Lube Oil System (refill) .......... 25 L (6.6 U.S. gal) Oil Change Interval .......................... 500 hr Caterpillar DEO 10W30 or 15W40 Rotation (from flywheel end) ....... Counterclockwise 3126B 186 bkW (250 bhp) 254 mhp @ 2400 rpm STANDARD EQUIPMENT Air Inlet System 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 Shown with Accessory Equipment LEHM2104-01
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Propulsion 3126B Engine - Cat | Cummins | Detroit Diesel · PDF fileCaterpillar DEO 10W30 or 15W40 Rotation (from flywheel end).....Counterclockwise 3126B 186 bkW (250 bhp) 254 mhp
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Cubic prop demand curve with 3.0 exponent for displacementhulls only.
Power produced at the flywheel will be within standardtolerances up to 50°C (122°F) combustion air temperaturemeasured at the air cleaner inlet, and fuel temperatureup to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure ascrankshaft power. Reduce crankshaft power by 3% forpropeller shaft power.
Typical Application . . . For heavy-duty service invessels such as freighters, tugboats, bottomdrag twawlers, and deep river towboats wherethe engine is operated at rated load and speedup to 100% of the time without interruption orload cycling.Typical Hours Per Year . . . . . . . . . . . 5000 to 8000Time at Rated Speed. . . . . . . . . . . . . . . Up to 100%Load Factor . . . . . . . . . . . . . . . . . . . . . . . 80 to 100%Typical Time at Full Load . . . . . . . . . . . . . No limit
Ratings are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in. Hg),25°C (77°F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 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 specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.
RATING DEFINITIONS AND CONDITIONS
DIMENSIONS*
mm in.
Overall Length 1580.7 62.2Length from front to rear face of block 1041.4 41.0Length from rear face of block to back of flywheel housing 136.0 5.4
Overall Height 917.1 36.1Height from crankshaft centerline to top of engine 629.3 24.8Height from crankshaft centerline to bottom of oil pan 287.8 11.3
Overall Width 889.9 35.0Width from crankshaft centerline to port side (left side) 389.1 15.3Width from crankshaft centerline to starboard side (right side) 500.8 19.7
Customer mounting hole diameter** 27.5 1.1Width from crankshaft centerline to side** 285.7 11.3Length from rear face of block to front** 716.3 28.2*Illustrations and dimensions from drawing: 175-7032**With optional front engine support
01 01 01
0303
0303
L W
H
Right Side Front
LEHM2104-01 3
3126B MARINE PROPULSION — 186 bkW (250 bhp)
TMI Reference No.: DM7370-00 (12-17-01)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposes ofcomparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine andoperating conditions beyond Caterpillar’s control.
Cubic prop demand curve with 3.0 exponent for displacementhulls only.
Power produced at the flywheel will be within standardtolerances up to 50°C (122°F) combustion air temperaturemeasured at the air cleaner inlet, and fuel temperatureup to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure ascrankshaft power. Reduce crankshaft power by 3% forpropeller shaft power.
Ratings are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in. Hg),25°C (77°F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 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 specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.
RATING DEFINITIONS AND CONDITIONS
DIMENSIONS*
mm in.
Overall Length 1580.7 62.2Length from front to rear face of block 1041.4 41.0Length from rear face of block to back of flywheel housing 136.0 5.4
Overall Height 917.1 36.1Height from crankshaft centerline to top of engine 629.3 24.8Height from crankshaft centerline to bottom of oil pan 287.8 11.3
Overall Width 889.9 35.0Width from crankshaft centerline to port side (left side) 389.1 15.3Width from crankshaft centerline to starboard side (right side) 500.8 19.7
Customer mounting hole diameter** 27.5 1.1Width from crankshaft centerline to side** 285.7 11.3Length from rear face of block to front** 716.3 28.2*Illustrations and dimensions from drawing: 175-7032**With optional front engine support
01 01 01
0303
0303
L W
H
Right Side Front
LEHM2105-01 3
3126B MARINE PROPULSION — 205 bkW (275 bhp)
TMI Reference No.: DM7371-00 (12-17-01)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposes ofcomparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine andoperating conditions beyond Caterpillar’s control.
Cubic prop demand curve with 3.0 exponent for displacementhulls only.
Power produced at the flywheel will be within standardtolerances up to 50°C (122°F) combustion air temperaturemeasured at the air cleaner inlet, and fuel temperatureup to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure ascrankshaft power. Reduce crankshaft power by 3% forpropeller shaft power.
Typical Application . . . Vessels such as ferries,harbor tugs, fishing boats moving at higherspeeds out and back (e.g. lobster, crayfish,and tuna), offshore service boats, and alsodisplacement hull yachts and short trip coastalfreighters where engine load and speed arecyclical.Typical Hours Per Year . . . . . . . . . . . 2000 to 4000Time at Rated Speed . . . . . . . . . . . . . . . . Up to 50%Load Factor . . . . . . . . . . . . . . . . . . . . . . . . 20 to 80%Typical Time at Full Load . . . . . 6 out of 12 hours
Ratings are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in. Hg),25°C (77°F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 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 specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.
RATING DEFINITIONS AND CONDITIONS
DIMENSIONS*
mm in.
Overall Length 1580.7 62.2Length from front to rear face of block 1041.4 41.0Length from rear face of block to back of flywheel housing 136.0 5.4
Overall Height 917.1 36.1Height from crankshaft centerline to top of engine 629.3 24.8Height from crankshaft centerline to bottom of oil pan 287.8 11.3
Overall Width 889.9 35.0Width from crankshaft centerline to port side (left side) 389.1 15.3Width from crankshaft centerline to starboard side (right side) 500.8 19.7
Customer mounting hole diameter** 27.5 1.1Width from crankshaft centerline to side** 285.7 11.3Length from rear face of block to front** 716.3 28.2*Illustrations and dimensions from drawing: 175-7032**With optional front engine support
01 01 01
0303
0303
L W
H
Right Side Front
LEHM2106-01 3
3126B MARINE PROPULSION — 235 bkW (315 bhp)
TMI Reference No.: DM7372-00 (12-17-01)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposes ofcomparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine andoperating conditions beyond Caterpillar’s control.
Cubic prop demand curve with 3.0 exponent for displacementhulls only.
Power produced at the flywheel will be within standardtolerances up to 50°C (122°F) combustion air temperaturemeasured at the air cleaner inlet, and fuel temperatureup to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure ascrankshaft power. Reduce crankshaft power by 3% forpropeller shaft power.
The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposes ofcomparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine and operatingconditions beyond Caterpillar’s control.
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 fueltemperature up to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure as crankshaft power. Reduce crankshaftpower by 3% for propeller shaft power.
RATING DEFINITIONS AND CONDITIONSD Rating (Patrol Craft)
% Load Factor: up to 50% Time at Rated RPM: up to 16Typical Time at Full Load: 2 hours out of 12Typical Hour/Year: 1000 to 3000Typical 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 withISO8665. Caterpillar maintains ISO9000 approvedengine test facilities to assure accurate calibration of testequipment. Electronically controlled engines are set atthe factory at the advertised power corrected to standardambient conditions. The published fuel consumptionrates 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 availablefor specific customer requirements. Consult yourCaterpillar representative for additional information.
3126B MARINE PROPULSION375 mhp (370 bhp) 276 bkW
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 to52° C (125° F) measured at the fuel filter base. Power rated in accordance with NMMAprocedure as crankshaft power. Reduce crankshaft power by 3% for propeller shaft power.
air cleaner with closed crankcase fumes disposalsystem
Charging System
belt-driven charging alternator and mounting (12volt, 51 ampere)
Control System
electronic governor with Electronic Control Module(ECM), throttle position sensor, engine-mounted40-pin dedicated customer connector, SAE J1939data link
Cooling System
sea water aftercooler with condensate drain valve,gear-driven auxiliary sea water pump and auxiliarysea water lines, engine-mounted heat exchangerwith removable copper-nickel tube bundle,expansion tank, thermostat and housing, engine oilcooler, transmission oil cooler
Exhaust System
watercooled exhaust manifold and turbocharger,fumes disposal routed to turbocharger inlet
Hydraulically actuated Electronically controlled UnitInjector (HEUI) fuel system, LH or RH service fuelfilter, fuel transfer pump
Lube System
top mounted crankcase breather, front centerservice oil filter, LH or RH service oil filler and oillevel gauge, oil pan, LH or RH service oil pan drain,gear-driven oil pump
Protection System
electronic overspeed protection
Starting System
rear-facing electric starting motor (12V), air inletheater
General
torsional vibration damper, lifting eyes
MarineEngine 3126B
313 bkW @ 2800 rpm420 bhp @ 2800 rpm
3126B MARINE ENGINE – 313 bkW (420 bhp)
PERFORMANCE CURVES
E Rating — DM6177-00 IMO Compliant
1200 1600 2000 2400 2800 3200Engine Speed - rpm
0
50
100
150
200
250
300
350
Po
wer
- b
kW
Fu
el R
ate
L/h
r
1200 1600 2000 2400 2800 3200Engine Speed - rpm
0
100
200
300
400
500
Po
wer
- b
hp
Fu
el R
ate
- g
/hr
313 bkW 420 bhpSI Metric English
Performance Data
EngineSpeed
rpm
EnginePowerbkW
BSFCg/
bkW-h
FuelRateL/h
BoostPresskPa
Gauge
IntakeAir
Flowm /min3
ExhManifTemp
Co
ExhGasFlow
m /min3
Performance Data
EngineSpeed
rpm
EnginePower
bhp
BSFClb/
bhp-h
FuelRategph
BoostPressin.Hg.Gauge
IntakeAir
Flowcfm
ExhManifTemp
Fo
ExhGasFlowcfm
ZoneLimitCurve: 4
280026002400220020001800160014001200
313.0313.0313.0313.0280.7201.3139.4112.593.0
235234227220214213220244285
87.887.284.882.271.651.036.632.831.6
264.8268.9274.4265.2226.7127.760.538.328.3
28.026.725.523.119.212.17.45.44.2
618634627634650650650650646
62.061.357.854.045.830.419.514.611.3
ZoneLimitCurve: 4
280026002400220020001800160014001200
420420420420376270187151125
.387
.384
.374
.362
.352
.350
.362
.402
.468
23.223.022.421.718.913.59.78.78.3
78.479.681.378.567.137.817.911.38.4
989943901816678427261191148
114511731161117312021202120312021194
219021652041190716171074689516399
MaxLugCurve: M
280026002400220020001800160014001200
313.0313.0313.0313.0295.4255.0187.3130.993.0
235234227221215213222246285
87.887.184.882.375.664.949.538.431.6
264.8268.9274.4265.2243.8188.1104.250.828.3
28.026.725.523.120.215.69.66.04.2
618634627634662688728713646
62.061.357.854.048.639.726.717.011.3
MaxLugCurve: M
280026002400220020001800160014001200
420420420420396342251176125
.387
.384
.374
.363
.353
.351
.364
.404
.468
23.223.022.421.720.017.113.110.18.3
78.479.681.378.572.255.730.915.08.4
989943901816713551339212148
114511731161117312241271134213151194
219021652041190717161402943600399
PropDemandCurve: P
280026002400220020001800160014001200
313.0250.6197.1151.8114.183.258.439.124.6
235222217218226236248262282
87.866.350.939.530.723.417.212.28.3
264.8212.4151.397.357.231.516.98.23.2
28.022.817.212.59.16.75.24.13.3
618533499488474440385322261
62.047.235.426.319.313.910.17.45.4
PropDemandCurve: P
280026002400220020001800160014001200
420336264204153112785233
.387
.365
.356
.359
.371
.387
.407
.431
.464
23.217.513.410.48.16.24.53.22.2
78.462.944.828.816.99.35.02.40.9
989805607441321237184145117
1145991931910885824725611503
219016671250929682491357261191
20
30
40
50
60
70
80
87.8
6
8
10
12
14
16
18
20
23.2
M
P
4
M
P
4
.....................................................................................Brake Mean Effective Pressure 1852 kPa .....................................................................................Brake Mean Effective Pressure 269 psi
3126B MARINE ENGINE – 313 bkW (420 bhp)
E RATING – Planing hull vessels such aspleasure craft, harbor patrol, harbor master, andsome fishing and pilot boats.
RATINGS are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in Hg),25° C (77° F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 conditions of 100 kPa (29.61 in Hg), 27° C(81° F), and 60% relative humidity. Ratings arevalid for air cleaner inlet temperatures up to andincluding 50° C (122° F) and for sea watertemperatures up to and including 42° C (108° F)at sea level.
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 at29° C (85° F) and weighing 838.9 g/liter(7.001 lbs/U.S. gal). Fuel consumption shownwith all oil, fuel, and water pumps, enginedriven. For a “without pumps” condition, deductapproximately 0.5% for each pump not enginedriven.
Additional ratings may be available for specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.
RATING DEFINITIONS AND CONDITIONSDIMENSIONS
917.1 mm
36.1 in
889.9 mm
35.0 in
1177.4 mm
46.4 in
1580.7 mm
62.2 in
3126B MARINE ENGINE – 313 bkW (420 bhp)
TMI Reference No.: DM6177-00Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposesof comparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine andoperating conditions beyond Caterpillar’s control.
Cubic prop demand curve with 3.0 exponent for displacementhulls only.
Power produced at the flywheel will be within standardtolerances up to 50°C (122°F) combustion air temperaturemeasured at the air cleaner inlet, and fuel temperatureup to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure ascrankshaft power. Reduce crankshaft power by 3% forpropeller shaft power.
Ratings are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in. Hg),25°C (77°F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 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 specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.
RATING DEFINITIONS AND CONDITIONS
DIMENSIONS*
mm in.
Overall Length 1580.7 62.2Length from front to rear face of block 1041.4 41.0Length from rear face of block to back of flywheel housing 136.0 5.4
Overall Height 917.1 36.1Height from crankshaft centerline to top of engine 629.3 24.8Height from crankshaft centerline to bottom of oil pan 287.8 11.3
Overall Width 889.9 35.0Width from crankshaft centerline to port side (left side) 389.1 15.3Width from crankshaft centerline to starboard side (right side) 500.8 19.7
Customer mounting hole diameter** 27.5 1.1Width from crankshaft centerline to side** 285.7 11.3Length from rear face of block to front** 716.3 28.2*Illustrations and dimensions from drawing: 175-7032**With optional front engine support
01 01 01
0303
0303
L W
H
Right Side Front
3126B MARINE PROPULSION — 313 bkW (420 bhp)
TMI Reference No.: DM6177-00 (6-19-01)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposes ofcomparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine andoperating conditions beyond Caterpillar’s control.
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 to52° C (125° F) measured at the fuel filter base. Power rated in accordance with NMMAprocedure as crankshaft power. Reduce crankshaft power by 3% for propeller shaft power.
air cleaner with closed crankcase fumes disposalsystem
Charging System
belt-driven charging alternator and mounting (12volt, 51 ampere)
Control System
electronic governor with Electronic Control Module(ECM), throttle position sensor, engine-mounted40-pin dedicated customer connector, SAE J1939data link
Cooling System
sea water aftercooler with condensate drain valve,gear-driven auxiliary sea water pump and auxiliarysea water lines, engine-mounted heat exchangerwith removable copper-nickel tube bundle,expansion tank, thermostat and housing, engine oilcooler, transmission oil cooler
Exhaust System
watercooled exhaust manifold and turbocharger,fumes disposal routed to turbocharger inlet
Hydraulically actuated Electronically controlled UnitInjector (HEUI) fuel system, LH or RH service fuelfilter, fuel transfer pump
Lube System
top mounted crankcase breather, front centerservice oil filter, LH or RH service oil filler and oillevel gauge, oil pan, LH or RH service oil pan drain,gear-driven oil pump
Protection System
electronic overspeed protection
Starting System
rear-facing electric starting motor (12V), air inletheater
General
torsional vibration damper, lifting eyes
MarineEngine 3126B
336 bkW @ 2800 rpm450 bhp @ 2800 rpm
3126B MARINE ENGINE – 336 bkW (450 bhp)
PERFORMANCE CURVES
E Rating — DM6181-00 IMO Compliant
1200 1600 2000 2400 2800 3200Engine Speed - rpm
0
50
100
150
200
250
300
350
400
Po
wer
- b
kW
Fu
el R
ate
L/h
r
1200 1600 2000 2400 2800 3200Engine Speed - rpm
0
100
200
300
400
500
Po
wer
- b
hp
Fu
el R
ate
- g
/hr
336 bkW 450 bhpSI Metric English
Performance Data
EngineSpeed
rpm
EnginePowerbkW
BSFCg/
bkW-h
FuelRateL/h
BoostPresskPa
Gauge
IntakeAir
Flowm /min3
ExhManifTemp
Co
ExhGasFlow
m /min3
Performance Data
EngineSpeed
rpm
EnginePower
bhp
BSFClb/
bhp-h
FuelRategph
BoostPressin.Hg.Gauge
IntakeAir
Flowcfm
ExhManifTemp
Fo
ExhGasFlowcfm
ZoneLimitCurve: 4
280026002400220020001800160014001200
335.5328.4323.5314.4287.5201.0138.4114.993.0
235231226221216213222254309
94.090.487.182.773.951.136.734.734.2
267.1270.5269.6260.6235.7130.363.241.728.2
27.526.224.522.319.111.97.35.44.0
639636639642644646644643605
63.560.657.152.845.629.519.014.410.5
ZoneLimitCurve: 4
280026002400220020001800160014001200
450440434422386270186154125
.386
.380
.372
.363
.354
.351
.365
.417
.507
24.823.923.021.819.513.59.79.29.0
79.180.179.877.269.838.618.712.38.4
971925865788675420258191141
118311771182118711921195119011891120
224221402016186516101042671509371
MaxLugCurve: M
280026002400220020001800160014001200
335.5335.5333.8323.9295.5255.2187.3130.993.0
235232227222217215223254309
94.092.890.385.676.365.349.839.634.2
267.1274.3275.9267.8244.8192.4108.052.728.2
27.526.424.922.719.615.29.45.84.0
639650655653652682715688605
63.562.159.154.647.038.525.916.410.5
MaxLugCurve: M
280026002400220020001800160014001200
450450448434396342251176125
.386
.382
.373
.364
.356
.353
.366
.417
.507
24.824.523.922.620.217.313.210.59.0
79.181.281.779.372.557.032.015.68.4
971932879802692537332205141
118312021212120812051259131912701120
224221932087192816601360915579371
PropDemandCurve: P
280026002400220020001800160014001200
335.5268.6211.3162.7122.389.162.641.926.4
235223217218224231239258294
94.071.354.642.332.624.517.912.99.2
267.1230.8171.0111.665.936.318.88.73.1
27.523.618.213.29.36.85.24.03.2
639539501487479456410346280
63.549.137.027.319.914.410.47.55.5
PropDemandCurve: P
280026002400220020001800160014001200
450360283218164119845635
.386
.366
.357
.359
.368
.379
.394
.424
.483
24.818.814.411.28.66.54.73.42.4
79.168.350.633.019.510.75.62.60.9
971833643466328240184141113
11831002933909895853770655537
224217341307964703509367265194
20
30
40
50
60
70
80
94.0
6
8
10
12
14
16
18
20
22
24.8
M
P
4
M
P
4
.....................................................................................Brake Mean Effective Pressure 1972 kPa .....................................................................................Brake Mean Effective Pressure 286 psi
3126B MARINE ENGINE – 336 bkW (450 bhp)
E RATING – Planing hull vessels such aspleasure craft, harbor patrol, harbor master, andsome fishing and pilot boats.
RATINGS are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in Hg),25° C (77° F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 conditions of 100 kPa (29.61 in Hg), 27° C(81° F), and 60% relative humidity. Ratings arevalid for air cleaner inlet temperatures up to andincluding 50° C (122° F) and for sea watertemperatures up to and including 42° C (108° F)at sea level.
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 at29° C (85° F) and weighing 838.9 g/liter(7.001 lbs/U.S. gal). Fuel consumption shownwith all oil, fuel, and water pumps, enginedriven. For a “without pumps” condition, deductapproximately 0.5% for each pump not enginedriven.
Additional ratings may be available for specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.
RATING DEFINITIONS AND CONDITIONSDIMENSIONS
917.1 mm
36.1 in
889.9 mm
35.0 in
1177.4 mm
46.4 in
1580.7 mm
62.2 in
3126B MARINE ENGINE – 336 bkW (450 bhp)
TMI Reference No.: DM6181-00Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposesof comparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine andoperating conditions beyond Caterpillar’s control.
Cubic prop demand curve with 3.0 exponent for displacementhulls only.
Power produced at the flywheel will be within standardtolerances up to 50°C (122°F) combustion air temperaturemeasured at the air cleaner inlet, and fuel temperatureup to 52°C (125°F) measured at the fuel filter base. Power rated in accordance with NMMA procedure ascrankshaft power. Reduce crankshaft power by 3% forpropeller shaft power.
Ratings are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in. Hg),25°C (77°F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 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 specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.
RATING DEFINITIONS AND CONDITIONS
DIMENSIONS*
mm in.
Overall Length 1580.7 62.2Length from front to rear face of block 1041.4 41.0Length from rear face of block to back of flywheel housing 136.0 5.4
Overall Height 917.1 36.1Height from crankshaft centerline to top of engine 629.3 24.8Height from crankshaft centerline to bottom of oil pan 287.8 11.3
Overall Width 889.9 35.0Width from crankshaft centerline to port side (left side) 389.1 15.3Width from crankshaft centerline to starboard side (right side) 500.8 19.7
Customer mounting hole diameter** 27.5 1.1Width from crankshaft centerline to side** 285.7 11.3Length from rear face of block to front** 716.3 28.2*Illustrations and dimensions from drawing: 175-7032**With optional front engine support
TMI Reference No.: DM6181-00 (1-22-02)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.
Performance data is calculated in accordance with tolerances and conditions stated in this specification sheet and is only intended for purposes ofcomparison with other manufacturers’ engines. Actual engine performance may vary according to the particular application of the engine andoperating conditions beyond Caterpillar’s control.