Power produced at the flywheel will be within standard tolerances up to 50C (122F)combustion air temperature measured at the air cleaner inlet, and fuel temperature up to52C (125F) measured at the fuel filter base. Power rated in accordance with NMMAprocedure as crankshaft power. Reduce crankshaft power by 3% for propeller shaft power.

SPECIFICATIONS

I-6, 4-Stroke-Cycle-Diesel

Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . IMO compliant

Bore mm (in). . . . . . . . . . . . . . . . . . . . . . . . . . . 110 (4.33)Strokemm (in) . . . . . . . . . . . . . . . . . . . . . . . . . . 127 (5.0)DisplacementL (cu in). . . . . . . . . . . . . . . . . . . . 7.2 (442)Rotation (from flywheel end). . . . . . . CounterclockwiseCompression Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.5:1Capacity for LiquidsL (U.S. gal)

Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (7.4)Lube Oil System (refill) . . . . . . . . . . . . . . . . . . . 25 (6.6)

Oil Change Interval hrs . . . . . . . . . . . . . . . . . . . . . . 250Caterpillar DEO 10W30 or 15W40

Engine Weight, Net Dry (approx) kg (lb) . . . . . . . . . . . . . . . . . . . . . 722 (1,592)

Shown withAccessory Equipment

STANDARD ENGINE EQUIPMENTAir Inlet System

12V air inlet heater, sea water aftercooler, aircleaner/fumes disposal, turbocharger

Charging System12V, 51 amp charging alternator

Control Systemmechanical governor, forward facing throttlecontrol

Cooling Systemthermostats and housing, belt-driven centrifugaljacket water pump, gear-driven auxiliary sea waterpump, expansion tank, marine gear oil cooler,engine mounted heat exchanger with removablecopper-nickel tube bundle, auxiliary sea water lines

Exhaust Systemwatercooled exhaust manifold and turbocharger,fumes disposal

Flywheel and Flywheel HousingSAE No. 3 flywheel (126 teeth) and SAE No. 3flywheel housing, SAE standard rotation

Fuel SystemRH or LH service filter, fuel transfer pump

Instrumentationmagnetic pickup tachometer drive, wiring harnessincludes junction box, mounting and hardware, 12Voil pressure and water temperature sender group(single station)

Lube Systemcrankcase breather, gear-driven engine oil pump,RH or LH service oil filter, oil filler, oil level gauge,pan drain, lubricating oil

Protection System12V energized-to-run solenoid shutoff, alarmcontactor

Starting System12V rear-facing electric starting motor, 12V junctionbox

Generalvibration damper and guard, Caterpillar yellowpaint, lifting eyes

MarinePropulsion 3126

224 bkW @ 2800 rpm300 bhp @ 2800 rpm

3126 MARINE PROPULSION 224 bkW (300 bhp)

PERFORMANCE CURVES

E Rating DM4953-00 IMO Compliant

1000 1400 1800 2200 2600 3000Engine Speed - rpm

0

50

100

150

200

250

Pow

er -

bkW

Fuel

Rat

e L/

hr

1000 1400 1800 2200 2600 3000Engine Speed - rpm

0

50

100

150

200

250

300

350

Pow

er -

bhp

Fuel

Rat

e - g

/hr

224 bkW 300 bhpSI Metric EnglishPerformance 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

MaxLimitCurve: 4

2800260024002200200018001600140012001120

224.0224.0212.5190.5166.1140.5115.290.668.159.8

222214207202201203206209207203

59.257.052.546.039.834.028.322.616.814.5

218.3210.3189.5155.8119.585.056.432.219.413.3

24.422.720.216.813.310.27.85.84.53.9

483475465457468486506514465442

49.046.041.635.328.923.318.814.110.58.7

MaxLimitCurve: 4

2800260024002200200018001600140012001120

3003002852552231881541219180

.364

.351

.340

.333

.331

.334

.339

.343

.340

.333

15.615.113.912.210.59.07.56.04.43.8

64.662.356.146.135.425.216.79.55.73.9

861801713593469360275205159138

901887869854874907942957870827

17291623146812461020822663498371307

MaxPowerCurve: M

2800260024002200200018001600140012001120

224.0224.0224.0221.0211.0198.0178.0154.0111.094.0

222214207201198218297382391337

59.257.055.252.949.951.463.170.151.737.7

218.3210.3201.1189.2168.4143.3150.9210.7121.878.3

24.422.720.918.616.013.515.624.014.89.8

483475480489507544596651620606

49.046.043.439.735.031.640.062.738.925.8

MaxPowerCurve: M

2800260024002200200018001600140012001120

300300300296283266239207149126

.364

.351

.340

.330

.326

.358

.489

.628

.643

.554

15.615.114.614.013.213.616.718.513.710.0

64.662.359.656.049.942.444.762.436.123.2

861801738656565476550847522346

901887895913944

10111105120311471124

172916231531140112351115141222131373910

PropDemandCurve: P

28002600240022002100200018001600140012001120

224.0179.3141.1108.794.581.659.541.828.017.614.3

222215212212213215221233250270279

59.246.035.727.524.020.915.711.68.35.74.8

218.3168.4118.778.061.446.624.312.05.00.41.9

24.420.015.612.010.49.06.85.44.63.53.0

483429401382372361331292248212199

49.038.930.323.220.217.412.89.77.65.54.6

PropDemandCurve: P

28002600240022002100200018001600140012001120

3002401891461271098056382419

.364

.354

.349

.349

.350

.353

.364

.384

.411

.444

.459

15.612.29.47.36.35.54.13.12.21.51.3

64.649.935.223.118.213.87.23.61.50.10.6

861706550423367318240191162124106

901804754720701681628557479413389

172913731069819713614452342268194162

10

15

20

25

30

35

40

45

50

55

59.2

3456

7

8

9

10111213141515.6

M

P

4

M

P

4

.....................................................................................Brake Mean Effective Pressure 1326 kPa .....................................................................................Brake Mean Effective Pressure 192 psi

3126 MARINE PROPULSION 224 bkW (300 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),25C (77F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 conditions of 100 kPa (29.61 in. Hg),27C (81F), and 60% relative humidity. Ratingsare valid for air cleaner inlet temperatures up toand including 50C (122F) and for sea watertemperatures up to and including 42C (108F) atsea level.

FUEL RATES are based on fuel oil of 35 API [16C (60F)] gravity having an LHV of42 780 kJ/kg (18,390 Btu/lb) when used at29C (85F) 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

897 mm35.3 in

937 mm36.9 in

1184 mm46.6 in

3126 MARINE PROPULSION 224 bkW (300 bhp)

TMI Reference No.: DM4953-00 (4-23-01)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

LEHM1456 (4-01) Printed in U.S.A. 2001 CaterpillarAll rights reserved.

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 Caterpillars control.

Power produced at the flywheel will be within standard tolerances up to 50C (122F)combustion air temperature measured at the air cleaner inlet, and fuel temperature up to52C (125F) measured at the fuel filter base. Power rated in accordance with NMMAprocedure as crankshaft power. Reduce crankshaft power by 3% for propeller shaft power.

SPECIFICATIONS

I-6, 4-Stroke-Cycle-Diesel

Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . IMO compliant

Bore mm (in). . . . . . . . . . . . . . . . . . . . . . . . . . . 110 (4.33)Strokemm (in) . . . . . . . . . . . . . . . . . . . . . . . . . . 127 (5.0)DisplacementL (cu in). . . . . . . . . . . . . . . . . . . . 7.2 (442)Rotation (from flywheel end). . . . . . . CounterclockwiseCompression Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.5:1Capacity for LiquidsL (U.S. gal)

Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (7.4)Lube Oil System (refill) . . . . . . . . . . . . . . . . . . . 25 (6.6)

Oil Change Interval hrs . . . . . . . . . . . . . . . . . . . . . . 250Caterpillar DEO 10W30 or 15W40

Engine Weight, Net Dry (approx) kg (lb) . . . . . . . . . . . . . . . . . . . . . 722 (1,592)

Shown withAccessory Equipment

STANDARD ENGINE EQUIPMENTAir Inlet System

12V air inlet heater, sea water aftercooler, aircleaner/fumes disposal, turbocharger

Charging System12V, 51 amp charging alternator

Control Systemmechanical governor, forward facing throttlecontrol

Cooling Systemthermostats and housing, belt-driven centrifugaljacket water pump, gear-driven auxiliary sea waterpump, expansion tank, marine gear oil cooler,engine mounted heat exchanger with removablecopper-nickel tube bundle, auxiliary sea water lines

Exhaust Systemwatercooled exhaust manifold and turbocharger,fumes disposal

Flywheel and Flywheel HousingSAE No. 3 flywheel (126 teeth) and SAE No. 3flywheel housing, SAE standard rotation

Fuel SystemRH or LH service filter, fuel transfer pump

Instrumentationmagnetic pickup tachometer drive, wiring harnessincludes junction box, mounting and hardware, 12Voil pressure and water temperature sender group(single station)

Lube Systemcrankcase breather, gear-driven engine oil pump,RH or LH service oil filter, oil filler, oil level gauge,pan drain, lubricating oil

Protection System12V energized-to-run solenoid shutoff, alarmcontactor

Starting System12V rear-facing electric starting motor, 12V junctionbox

Generalvibration damper and guard, Caterpillar yellowpaint, lifting eyes

MarinePropulsion 3126

261 bkW @ 2800 rpm350 bhp @ 2800 rpm

3126 MARINE PROPULSION 261 bkW (350 bhp)

PERFORMANCE CURVES

E Rating DM4952-00 IMO Compliant

1000 1400 1800 2200 2600 3000Engine Speed - rpm

0

50

100

150

200

250

300

Pow

er -

bkW

Fuel

Rat

e L/

hr

1000 1400 1800 2200 2600 3000Engine Speed - rpm

0

50

100

150

200

250

300

350

400

Pow

er -

bhp

Fuel

Rat

e - g

/hr

261 bkW 350 bhpSI Metric EnglishPerformance 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

MaxLimitCurve: 4

2800260024002200200018001600140012001120

261.0261.0247.3221.6193.2163.5134.0105.579.269.6

218214209203200200203208211210

67.966.761.653.746.039.032.426.119.917.4

187.8180.7171.5157.4138.0104.967.540.524.717.2

22.120.919.216.914.411.38.35.94.63.7

573575557525504517557572526502

52.650.545.839.232.926.921.015.611.69.0

MaxLimitCurve: 4

2800260024002200200018001600140012001120

35035033229725921918014110693

.359

.352

.343

.334

.329

.329

.334

.341

.347

.344

17.917.616.314.212.210.38.66.95.34.6

55.653.550.846.640.931.120.012.07.35.1

780738678596508399293208162131

106310671035977939962

10341061980935

18561782161613831161949741550409318

MaxPowerCurve: M

2800260024002200200018001600140012001120

261.0261.0260.0251.0239.0224.0204.0157.0110.091.0

218215210206204206217253290289

67.966.765.161.558.155.052.847.438.131.3

187.8180.7177.2170.9162.8153.3126.618.080.155.1

22.120.919.517.715.814.011.25.4

10.27.7

573575581583587605713832657612

52.650.548.043.839.836.430.719.527.920.6

MaxPowerCurve: M

2800260024002200200018001600140012001120

350350349337321300274211148122

.359

.353

.345

.338

.335

.338

.357

.417

.477

.475

17.917.617.216.215.314.513.912.510.18.3

55.653.552.550.648.245.437.55.3

23.716.3

780738688625558494395191360272

1063106710771081108811201315152912141133

1856178216941546140412841083688985727

PropDemandCurve: P

28002600240022002100200018001600140012001120

261.0209.0164.4126.6110.195.169.348.732.620.516.7

218212209209210211217229246265272

68.052.841.031.627.624.017.913.39.66.55.4

187.8159.5128.890.471.955.329.313.95.40.82.6

22.119.416.212.610.99.57.25.74.63.43.0

573488431405399389359318273230215

52.641.933.125.622.219.214.210.67.95.54.7

PropDemandCurve: P

28002600240022002100200018001600140012001120

3502802201701481289365442722

.359

.349

.344

.344

.345

.347

.356

.376

.404

.435

.448

18.013.910.88.37.36.34.73.52.51.71.4

55.647.238.126.821.316.48.74.11.60.20.8

780685572445385335254201162120106

1063910807760750732678605523446419

185614791168903783678501374279194166

10

20

30

40

50

60

68.0

4

6

8

10

12

14

16

18.0

M

P

4

M

P

4

.....................................................................................Brake Mean Effective Pressure 1545 kPa .....................................................................................Brake Mean Effective Pressure 224 psi

3126 MARINE PROPULSION 261 bkW (350 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),25C (77F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 conditions of 100 kPa (29.61 in. Hg),27C (81F), and 60% relative humidity. Ratingsare valid for air cleaner inlet temperatures up toand including 50C (122F) and for sea watertemperatures up to and including 42C (108F) atsea level.

FUEL RATES are based on fuel oil of 35 API [16C (60F)] gravity having an LHV of42 780 kJ/kg (18,390 Btu/lb) when used at29C (85F) 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

897 mm35.3 in

937 mm36.9 in

1184 mm46.6 in

3126 MARINE PROPULSION 261 bkW (350 bhp)

TMI Reference No.: DM4952-00 (4-23-01)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

LEHM1457 (4-01) Printed in U.S.A. 2001 CaterpillarAll rights reserved.

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 Caterpillars control.

Power produced at the flywheel will be within standard tolerances up to 50C (122F)combustion air temperature measured at the air cleaner inlet, and fuel temperature up to52C (125F) measured at the fuel filter base. Power rated in accordance with NMMAprocedure as crankshaft power. Reduce crankshaft power by 3% for propeller shaft power.

SPECIFICATIONS

I-6, 4-Stroke-Cycle-Diesel

Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . IMO compliant

Bore mm (in). . . . . . . . . . . . . . . . . . . . . . . . . . . 110 (4.33)Strokemm (in) . . . . . . . . . . . . . . . . . . . . . . . . . . 127 (5.0)DisplacementL (cu in). . . . . . . . . . . . . . . . . . . . 7.2 (442)Rotation (from flywheel end). . . . . . . CounterclockwiseCompression Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.5:1Capacity for LiquidsL (U.S. gal)

Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (7.4)Lube Oil System (refill) . . . . . . . . . . . . . . . . . . . 25 (6.6)

Oil Change Interval hrs . . . . . . . . . . . . . . . . . . . . . . 250Caterpillar DEO 10W30 or 15W40

Engine Weight, Net Dry (approx) kg (lb) . . . . . . . . . . . . . . . . . . . . . 722 (1,592)

Shown withAccessory Equipment

STANDARD ENGINE EQUIPMENTAir Inlet System

12V air inlet heater, sea water aftercooler, aircleaner/fumes disposal, turbocharger

Charging System12V, 51 amp charging alternator

Control Systemmechanical governor, forward facing throttlecontrol

Cooling Systemthermostats and housing, belt-driven centrifugaljacket water pump, gear-driven auxiliary sea waterpump, expansion tank, marine gear oil cooler,engine mounted heat exchanger with removablecopper-nickel tube bundle, auxiliary sea water lines

Exhaust Systemwatercooled exhaust manifold and turbocharger,fumes disposal

Flywheel and Flywheel HousingSAE No. 3 flywheel (126 teeth) and SAE No. 3flywheel housing, SAE standard rotation

Fuel SystemRH or LH service filter, fuel transfer pump

Instrumentationmagnetic pickup tachometer drive, wiring harnessincludes junction box, mounting and hardware, 12Voil pressure and water temperature sender group(single station)

Lube Systemcrankcase breather, gear-driven engine oil pump,RH or LH service oil filter, oil filler, oil level gauge,pan drain, lubricating oil

Protection System12V energized-to-run solenoid shutoff, alarmcontactor

Starting System12V rear-facing electric starting motor, 12V junctionbox

Generalvibration damper and guard, Caterpillar yellowpaint, lifting eyes

MarinePropulsion 3126

287 bkW @ 2800 rpm385 bhp @ 2800 rpm

3126 MARINE PROPULSION 287 bkW (385 bhp)

PERFORMANCE CURVES

E Rating DM4951-00 IMO Compliant

1000 1400 1800 2200 2600 3000Engine Speed - rpm

0

50

100

150

200

250

300

350

Pow

er -

bkW

Fuel

Rat

e L/

hr

1000 1400 1800 2200 2600 3000Engine Speed - rpm

0

50

100

150

200

250

300

350

400

450

Pow

er -

bhp

Fuel

Rat

e - g

/hr

287 bkW 385 bhpSI Metric EnglishPerformance Data

EngineSpeed

rpm

EnginePowerbkW

BSFCg/

bkW-h

FuelRateL/h

BoostPresskPa

Gauge

IntakeAir

Flowm /min3

ExhManifTemp

Co

ExhGasFlow

m /min3

Performance Data

EngineSpeed

rpm

EnginePowerbhp

BSFClb/

bhp-h

FuelRategph

BoostPressin.Hg.Gauge

IntakeAir

Flowcfm

ExhManifTemp

Fo

ExhGasFlowcfm

MaxLimitCurve: 4

2800260024002200200018001600140012001120

287.0286.0265.9238.3207.8175.8117.092.272.470.5

222.2220.2214.2207.1200.9199.5201.3204.0207.7210.2

76.075.167.958.849.741.828.122.417.917.7

198.7198.3185.5168.0145.5115.156.434.620.819.7

23.021.919.817.414.611.77.75.74.23.8

618628599562528531512510487501

57.956.750.242.234.228.018.814.010.29.4

MaxLimitCurve: 4

2800260024002200200018001600140012001120

3853843573202792361571249795

.365

.362

.352

.340

.330

.328

.331

.335

.341

.346

20.119.817.915.513.111.07.45.94.74.7

58.858.754.949.843.134.116.710.26.25.8

812773699614516413272201148134

1145116211101043982987953951909933

20452002177314901208989664494360332

MaxPowerCurve: M

2800260024002200200018001600140012001120

287.0287.0282.0275.0261.0244.0220.0164.0108.086.0

222.2217.7212.8207.8203.4201.6222.8258.4276.7244.9

76.074.571.568.163.358.658.450.535.625.1

198.7198.6190.0184.9174.5162.7138.377.879.737.0

23.021.919.918.416.113.811.88.79.45.1

618629620629630648735791635586

57.956.851.748.242.036.633.128.126.013.8

MaxPowerCurve: M

2800260024002200200018001600140012001120

385385378369350327295220145115

.365

.358

.350

.342

.334

.331

.366

.425

.455

.403

20.119.718.918.016.715.515.413.39.46.6

58.858.856.354.851.748.241.023.023.611.0

812773703650569487417307332180

1145116411481164116611981356145711761087

2045200618261702148312931169992918487

PropDemandCurve: P

28002600240022002100200018001600140012001120

287.0229.8180.7139.2121.1104.676.253.635.922.618.4

222.2212.4206.4204.7205.4207.1212.5220.9232.8247.6254.2

76.058.244.534.029.625.819.314.110.06.75.6

198.7171.4141.9105.083.764.335.318.48.82.50.2

23.020.116.813.411.610.07.45.84.63.73.3

618524447411403398373332283238224

57.945.835.127.123.620.314.811.08.26.05.2

PropDemandCurve: P

28002600240022002100200018001600140012001120

38530824218716214010272483025

.365

.349

.339

.337

.338

.340

.349

.363

.383

.407

.418

20.115.411.89.07.86.85.13.72.61.81.5

58.850.842.031.124.819.010.55.42.60.70.1

812710593473410353261205162131117

1145975836772757748703629542460435

204516171240957833717523388290212184

10

20

30

40

50

60

7076.0

4

6

8

10

12

14

16

18

20.1

M

P

4

M

P

4

.....................................................................................Brake Mean Effective Pressure 1699 kPa .....................................................................................Brake Mean Effective Pressure 246 psi

3126 MARINE PROPULSION 287 bkW (385 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),25C (77F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 conditions of 100 kPa (29.61 in. Hg),27C (81F), and 60% relative humidity. Ratingsare valid for air cleaner inlet temperatures up toand including 50C (122F) and for sea watertemperatures up to and including 42C (108F) atsea level.

FUEL RATES are based on fuel oil of 35 API [16C (60F)] gravity having an LHV of42 780 kJ/kg (18,390 Btu/lb) when used at29C (85F) 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

897 mm35.3 in

937 mm36.9 in

1184 mm46.6 in

3126 MARINE PROPULSION 287 bkW (385 bhp)

TMI Reference No.: DM4951-00 (8-00)Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

LEHM0594 (3-01) Printed in U.S.A. 2001 CaterpillarAll rights reserved.

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 Caterpillars control.

MarineEngine

3126224-287 bkW/300-385 bhp

2800 rpm

Air intake aftercooler, air cleaner/fumes disposal (closedsystem), air inlet heater

Alternator belt driven, 12 volt, 51 ampere

Cooling transmission oil cooler, heat exchanger,auxiliary sea water pump, expansion tank,thermostat, jacket water pump

Exhaustwatercooled manifold and turbocharger

Flywheel and housing SAE No. 3, rear-facing starter

Fuel filter, fuel transfer pump

Governor mechanical

Instrumentationmagnetic pickup (for tachometer drive)

Lubricating oil filter, filler, dipstick, crankcase breather, oilpump

Service RH and LHservice per top level PAs

Starting electric

Torsional vibration damperWiring harness

junction box, mounting and hardware

906 mm35.7 in

937 mm36.9 in

1184 mm46.6 in

CATERPILLAR ENGINE SPECIFICATIONS

In-Line 6, 4-Stroke-Cycle-DieselEmissions . . . . . . . . . . . . . . . . . . . . . . . IMO compliantBore mm (in) . . . . . . . . . . . . . . . . . . . . . . . 110 (4.33)Stroke mm (in) . . . . . . . . . . . . . . . . . . . . . . 127 (5.0)Displacement L (cu in) . . . . . . . . . . . . . . 7.2 (442)Rotation (from flywheel end) . . CounterclockwiseCompression Ratio . . . . . . . . . . . . . . . . . . . . . . . 15.0:1Capacity for Liquids L (U.S. gal)

Cooling System . . . . . . . . . . . . . . . . . . . . . 28.0 (7.4)Lube Oil System (refill) . . . . . . . . . . . . . . 25.0 (6.6)

Oil Change Interval . . . . . . . . . . . . . . . . . . . . . 250 hrsEngine Weight, Net Dry

(approx) kg (lb) . . . . . . . . . . . . . . . . . . . 722 (1592)

DIMENSIONS

Shown with Accessory Equipment

This Caterpillar Marine Engine can be operated with air inlet temperatures up to 50C(122F) measured at the air inlet, and fuel temperatures up to 52C (125F) measured atthe fuel filter base. Power rated in accordance with NMMA procedure as crankshaftpower. Reduce crankshaft power by 3% for propeller shaft power.

Ratings are based on SAE J1228/ISO8665standard conditions of 100 kPa (29.61 in Hg),25C (77F), and 30% relative humidity. Theseratings also apply at ISO3046/1, DIN6271/3, andBS5514 conditions of 100 kPa (29.61 in Hg), 27C(81F), and 60% relative humidity.

Fuel rates are based on fuel oil of 35 API [16C(60F)] gravity having an LHV of 42 780 kJ/kg(18 390 Btu/lb) when used at 29C (85F) andweighing 838.9 g/liter (7.001 lbs/U.S. gal).

Additional ratings may be available for specificcustomer requirements. Consult your Caterpillarrepresentative for additional information.

RATING DEFINITIONS AND CONDITIONS

STANDARD EQUIPMENT

LEHM7009-04

Engine Speed rpm

To

rqu

elb

-ft

Po

wer

b

hp

Co

ns.

Rat

eg

/hr

L/h

rN

mb

kW

1200 1600 1800 2200 2400 2600 280020001400

300

400

100

200

700

900

500

300

100

2

12

22

75

10

40

70

100

700

1300

175

275

PERFORMANCE CURVES

E Rating 2800 rpm 287 bkW (385 bhp) 390 mhp

3126 MUI MARINE ENGINE 224-287 bkW

Engine Speed rpm

To

rqu

elb

-ft

Po

wer

b

hp

Co

ns.

Rat

eg

/hr

L/h

rN

mb

kW

1200 1600 1800 2200 2400 2600 280020001400

300

400

100

200

700

900

500

300

100

2

12

22

75

10

40

70

100

700

1300

175

275

E Rating 2800 rpm 261 bkW (350 bhp) 355 mhp

Engine Speed rpm

To

rqu

elb

-ft

Po

wer

b

hp

Co

ns.

Rat

eg

/hr

L/h

rN

mb

kW

1200 1600 1800 2200 2400 2600 280020001400

300

400

100

200

700

900

500

300

100

2

12

22

75

10

40

70

100

700

1300

175

275

E Rating 2800 rpm 224 bkW (300 bhp) 304 mhp

Prop Demand 3.0 Exponent (for displacement hulls only)

Engine Performance Parameters: Power +/- 3%; Specific Fuel Consumption +/- 3%; Fuel Rate +/- 5%.

Materials and specifications are subject to change without notice. The International System of Units (SI) is used in this publication.

LEHM7009-04 (4-02) Printed in U.S.A. 2002 Caterpillar Inc.All rights reserved.

Fuel Fuel Fuel FuelSpeed Power Torque Cons Rate Power Torque Cons Raterpm bkW Nm g/bkW-hr L/hr bkW Nm g/bkW-hr L/hr______ ________________________________ ___________________________________2800 287 979 222 76.0 287 979 222 76.02600 230 844 212 58.2 287 1054 218 74.52400 181 719 206 44.5 282 1122 213 71.52200 139 604 205 34.0 275 1194 208 68.12000 105 499 207 25.8 261 1246 203 63.31800 76 405 213 19.3 244 1294 202 58.71600 54 320 221 14.1 220 1313 215 56.41400 36 245 233 10.0 164 1119 256 50.11200 23 180 248 6.7 108 859 327 42.1

Fuel Fuel Fuel FuelSpeed Power Torque Cons Rate Power Torque Cons Raterpm bhp lb-ft lb/bhp-hr g/hr bhp lb-ft lb/bhp-hr g/hr______ ________________________________ ___________________________________2800 385 722 .365 20.1 385 722 .365 20.12600 308 623 .349 15.4 385 777 .358 19.72400 242 530 .339 11.8 378 828 .350 18.92200 187 445 .337 9.0 369 881 .342 18.02000 140 368 .340 6.8 350 919 .334 16.71800 102 299 .349 5.1 327 954 .332 15.51600 72 236 .363 3.7 295 968 .353 14.91400 48 181 .383 2.6 220 825 .421 13.21200 30 133 .407 1.8 145 634 .537 11.1

Cubic Prop Demand Curve Data(for displacement hulls only) Max Power Curve Data

E RATING Planing hull vessels such as pleasure craft, harbor patrol, harbormaster, and some fishing and pilot boats.

TMI DM4951-00

Fuel Fuel Fuel FuelSpeed Power Torque Cons Rate Power Torque Cons Raterpm bkW Nm g/bkW-hr L/hr bkW Nm g/bkW-hr L/hr______ ________________________________ ___________________________________2800 261 890 218 68.0 261 890 218 67.92600 209 768 212 52.8 261 959 215 66.72400 164 654 209 41.0 260 1035 210 65.12200 127 550 209 31.5 251 1089 206 61.52000 95 454 211 23.9 239 1141 204 58.11800 69 368 217 17.9 224 1188 206 55.01600 49 291 229 13.3 204 1218 215 52.31400 33 223 246 9.6 157 1071 249 46.61200 21 163 265 6.5 110 875 342 44.8

Fuel Fuel Fuel FuelSpeed Power Torque Cons Rate Power Torque Cons Raterpm bhp lb-ft lb/bhp-hr g/hr bhp lb-ft lb/bhp-hr g/hr______ ________________________________ ___________________________________2800 350 656 .359 18.0 350 656 .359 17.92600 280 566 .349 13.9 350 707 .353 17.62400 220 482 .344 10.8 349 763 .345 17.22200 170 406 .344 8.3 337 803 .338 16.22000 128 335 .347 6.3 321 842 .335 15.31800 93 271 .356 4.7 300 876 .339 14.51600 65 215 .376 3.5 274 898 .354 13.81400 44 164 .404 2.5 211 790 .409 12.31200 27 120 .435 1.7 148 645 .562 11.8

Cubic Prop Demand Curve Data(for displacement hulls only) Max Power Curve Data

E RATING Planing hull vessels such as pleasure craft, harbor patrol, harbormaster, and some fishing and pilot boats.

TMI DM4952-00

Fuel Fuel Fuel FuelSpeed Power Torque Cons Rate Power Torque Cons Raterpm bkW Nm g/bkW-hr L/hr bkW Nm g/bkW-hr L/hr______ ________________________________ ___________________________________2800 224 764 222 59.2 224 764 222 59.22600 179 659 215 46.0 224 823 214 57.02400 141 561 212 35.7 224 891 207 55.22200 109 472 212 27.5 221 959 201 52.92000 82 390 215 20.9 211 1007 198 49.91800 60 316 221 15.7 198 1050 218 51.41600 42 249 233 11.6 178 1062 297 63.01400 28 191 250 8.3 154 1050 376 68.91200 18 140 270 5.7 111 883 397 52.5

Fuel Fuel Fuel FuelSpeed Power Torque Cons Rate Power Torque Cons Raterpm bhp lb-ft lb/bhp-hr g/hr bhp lb-ft lb/bhp-hr g/hr______ ________________________________ ___________________________________2800 300 563 .364 15.6 300 563 .364 15.62600 240 486 .354 12.2 300 607 .351 15.12400 189 414 .349 9.4 300 657 .340 14.62200 146 348 .349 7.3 296 707 .331 14.02000 109 288 .353 5.5 283 743 .326 13.21800 80 233 .364 4.1 266 774 .358 13.61600 56 184 .383 3.1 239 783 .489 16.61400 38 141 .411 2.2 207 774 .617 18.21200 24 103 .444 1.5 149 651 .653 13.9

Cubic Prop Demand Curve Data(for displacement hulls only) Max Power Curve Data

E RATING Planing hull vessels such as pleasure craft, harbor patrol, harbormaster, and some fishing and pilot boats.

TMI DM4953-00

LEHM1456.pdfLEHM1457.pdfLEHM0594.pdfLEHM7009-04.pdf