ENGINE PERFORMANCE CURVE
PowerTechTM 6.8L Engine
Rating: M4 - 355 HP (265 kW) @ 2700 rpm
Application:Marine Model: 6068SFM85
900
800 Crankshaft 1085
REFERENCE CONDITIONS
Torque - lb-ft
Torque - Nm
700 949 REFERENCE CONDITIONS
Air Intake Restriction......................................................................12 in.H 2O (3 kPa)
872 lb-ft (1182 Nm) Exhaust Back Pressure................................................................ 30 in.H2O (7.5 kPa)
Air Intake Restriction…………………………………………………………………. 12 in.H2O (3 kPa)
600 813
Rated speed
Exhaust Backand power
Pressure………………………………………………………… 30 in.H2O (7.5 kPa)
Gross power guaranteed within ±5% at SAE J1995 and ISO 3046
500 678 J1995 and ISO 3046 conditions:
77 ˚F (25 ˚C) air inlet temperature
400 542 29.31 in.Hg (99 kPa) barometric pressure
Rated speed and power 104 ˚F (40 ˚C) fuel inlet temperature
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800
0.853 fuel specific gravity @ 60 ˚F (15.5 ˚C)
J1995 and ISO 3046 conditions:
Ambient air temperature is defined to be the temperature of ambient air close to
400 298 operating vessel77 ˚F is
that (25not
˚C) influenced
air inlet temperature
in any manner by operating characteristics of the
350 Crankshaft 261 vessel (free field temp).
29.31 in.Hg (99 kPa) barometer
300 224 Conversion factors:
104 ˚F (40 ˚C) fuel inlet temperature
Power: kW = hp x 0.746
Power - kW
Power - hp
250 186
0.853 Fuel:
fuel specific
1 gal = gravity
7.1 lb, 1@
L=600.85
˚F (15.5
kg ˚C)
200 149 Torque: N·m = lb-ft x 1.356
150 112 All values from currently available data. Subject to manufacturing and measurement
100 Propeller Power 75 variations and to change without notice.
Actual performance is subject to application and operation conditions outside of John
50 37 Deere control.
Conversion factors:
0 0
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 Power: kW = hp x 0.746
Fuel: 1 gal = 7.1 lb, 1 L = 0.85 kg
Notes:
18 68 Torque: N·m = lb-ft x 1.356
M4: The M4 rating is for marine propulsion applications that operate up to 800 hours
16 61 per year and have load factors below 40%. This rating is for applications that use full
power for no more than 1 hour out of each 12 hours of operation. The remaining time
14 53 of operation must be at cruising speeds.
12 Propeller Fuel 45 Possible applications: Inshore crew boats, charter fishing boats, pilot boats, dive
Fuel - gal/hr
Fuel - L/hr
boats, and planning hull commercial fishing boats.
10 38
8 30
6 23
4 15 Designed/Calibrated to meet: Certified by:
2 8 • EPA Commercial Marine Tier 3
0 0 • IMO MARPOL Annex VI Compliant
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 • NRMM (97/68/EC), as amended
Engine Speed - RPM
Ref: Engine Emission Label 15-Aug-12
Performance Curve: 6068SFM85_D
All values at rated speed, power, and standard conditions, per SAE J1995 unless otherwise noted.
Engine Performance Curves 6068 - Marine August 2012
Engine Installation Criteria
General Data Physical Data
Model 6068SFM85 Length to rear face of block 1027 mm 40.4 in
Number of Cylinders 6 Length maximum 1317 mm 51.9 in
Bore 106 mm 4.17 in Width maximum 872 mm 34.3 in
Stroke 127 mm 5.00 in Height, crank centerline to top 645 mm 25.4 in
3
Displacement 6.8 L 415 in Height, crank centerline to bottom 293 mm 293 in
Compression Ratio 16.3:1 Weight, with oil, no coolant (includes engine, flywheel
0 kg 0 lb
Valves per Cylinder, Intake/Exhaust 2/2 housing, flywheel, and electronics)
Combustion System Direct injection Center of Gravity Location, X-axis From Rear Face 0 mm 0.0 in
Firing Order 1-5-3-6-2-4 of Block
Engine Type In line, 4 Cycle Center of Gravity Location, Y-axis Right of Crankshaft 0 mm 0.0 in
Aspiration Turbocharged and Aftercooled Center of Gravity Location, Z-axis Above Crankshaft 0 mm 0.0 in
Aftercooling System Seawater cooled Max. Allowable Static Bending Moment At Rear Face
814 Nm 600 lb-ft
Engine Crankcase Vent System Closed of Flywheel Housing with 5-G Load
Thrust Bearing Load Limit, Forward Continuous 2.2 kN 495 lbf
Cooling System* Thrust Bearing Load Limit, Forward Intermittent 4 kN 899 lbf
Total Engine to Seawater Heat Rejection** 197.77 kW 11257 BTU/min Thrust Bearing Load Limit, Rearward Continuous 1 kN 225 lbf
Aftercooler Heat Rejection 57.2 kW 3256 BTU/min Thrust Bearing Load Limit, Rearward Intermittent 2 kN 450 lbf
Coolant Flow 262 L/min 69 gal/min
Thermostat Start to Open 82 ˚C 180 ˚F Electrical System
Thermostat Fully Open 95 ˚C 203 ˚F Min. Recommended Battery Capacity, 12V @32 ˚F (0 ˚C) 925 amps
Min. Coolant Fill Rate 12 L/min 3.2 gal/min Min. Recommended Battery Capacity, 24V @32 ˚F (0 ˚C) 625 amps
Min. Pressure Cap 110.3 kPa 16 psi Starter Rolling Current, 12V @32 ˚F (0 ˚C) 920 amps
Max. External Coolant Restriction 40 kPa 5.8 psi Starter Rolling Current, 24V @32 ˚F (0 ˚C) 600 amps
Normal Operation Max Top Tank Temperature 100 ˚C 212 ˚F Min. Voltage at ECU during Cranking, 12V 6 volts
≤ 5% of Total Operating Time Top Min. Voltage at ECU during Cranking, 24V 10 volts
100-110 ˚C 212-230 ˚F
Tank Temperature Max. Allowable Start Circuit Resistance, 12V 0.002 ohms
Absolute Max Top Tank Temperature 110 ˚C 230 ˚F Max. Allowable Start Circuit Resistance, 24V 0.0012 ohms
Recommended Fuel Cooler 9 kW 520 BTU/min Recommended Starter Cable, 12V 100" #00
Engine Radiated Heat 35 kW 1979 BTU/min Recommended Starter Cable, 24V 100" #2
Recommended Starter Cable, 12V 200" #0000 or 2 #00
Recommended Starter Cable, 24V 200" #0
Electrical Component Maximum Temperature Limit 125 ˚C 257 ˚F
* The cooling system should be capable of typical at ambient up to the maximum
conditions in which the vessel will operate.
Typical operation is defined as the average load sustainable in the vessel over 10 min.
Performance Curve: 6068SFM85_D
** Reference 32 ˚C Sea Water Temperature
All values at rated speed, power, and standard conditions, per SAE J1995 unless otherwise noted.
Engine Performance Curves 6068 - Marine Sheet 2 - August 2012
Engine Installation Criteria
Fuel System Air Intake System
ECU Description L14 Engine Air Flow 20.6 m3/min 727 ft3/min
Fuel Injection Pump HPCR Intake Manifold Pressure 259 kPa 37.6 psi
Governor Type Electronic Manifold Air Temperature 34 ˚C 93 ˚F
Volumetric Fuel Consumption 69.3 L/hr 18.3 gal/hr Maximum Manifold Air Temperature 67 ˚C 153 ˚F
Mass Fuel Consumption 58.9 kg/hr 130 lb/hr Max. Allowable Temperature Rise, Ambient
17 ˚C 30 ˚F
Total Fuel Volumetric Flow 192 L/hr 50.7 gal/hr Air to Engine Inlet
Total Fuel Mass Flow 163 kg/hr 360 lb/hr Max. Air Intake Restriction, Clean Air Cleaner 3 kPa 12 in.H2O
Max. Fuel Inlet Restriction* 20 kPa 80 in.H2O Max. Air Intake Restriction, Dirty Air Cleaner 6.25 kPa 25 in.H2O
Max. Fuel Inlet Pressure 20 kPa 80 in.H2O Min. Ventilation Area 0.127 m2 196 in2
Max Fuel Return Pressure 20 kPa 80 in.H2O
Max. Fuel Height Above Transfer Pump 2.4 m 7.9 ft Performance Data
Max. Leak-off Return Height 2.4 m 7.9 ft Rated Power 265 kW 355 hp
Max. Fuel Inlet Height Above Fuel Tank Supply 2.4 m 7.9 ft Rated Speed 2700 RPM
Normal Operation Fuel Temperature 40 ˚C 104 ˚F Peak Torque Speed 2000 RPM
Max. Fuel Inlet Temperature 100 ˚C 212 ˚F Low Idle Speed 600 RPM
Min. Recommended Fuel Line Inside Diameter 7.46 mm 0.29 in Rated Torque 937 Nm 691 ft-lb
Min. Recommended Fuel Line Size 5 (-) AN Peak Torque 1182 Nm 872 ft-lb
Primary Fuel Filter 10 mic BMEP, Rated 1732 kPa 251 psi
Secondary Fuel Filter 2 mic Rated Pferdestärke (metric hp) 360 ps
Front Drive Capacity, Intermittent 907 Nm 669 lb-ft
Lubrication System Front Drive Capacity, Continuous 907 Nm 669 lb-ft
Oil Pressure at Rated Speed 415 kPa 60 psi
Oil Pressure at Low Idle (800rpm)** 180 kPa 26 psi Exhaust System
Max. Crankcase Pressure 2 kPa 8 in.H2O Exhaust Flow 48 m3/min 1695 ft3/min
Maximum Installed Angle, Front Down 0 deg Exhaust Flow @ gas STP 21.67 m3/min 765 ft3/min
Maximum Installed Angle, Front Up 12 deg Exhaust Temperature 436 ˚C 817 ˚F
Engine Angularity Limits Any Direction, Continuous*** 25 deg Max. Allowable Exhaust Restriction 7.5 kPa 30 in.H2O
Engine Angularity Limits Any Direction, Intermittent*** 35 deg Max. Shear on Turbocharger Exhaust Outlet 11 kg 24.3 lb
Max. Bending Moment on Turbocharger Exhaust
7 Nm 15.4 lb-ft
Seawater Pump System Outlet
Seawater Pump Flow 248 L/min 66 gal/min Min. Exhaust Pipe Diameter, Dry 127 mm 5.0 in
Max. Suction Lift 3 m 9.8 ft Min. Exhaust Pipe Diameter, Wet 139.7 mm 5.5 in
Max. Outlet Pressure 140 kPa 20 psi
Max. Inlet Restriction 30 kPa 4 psi
* With clean filters
** With John Deere Plus-50 IITM 15w-40, not applicable with break in oil.
Performance Curve: 6068SFM85_D
*** With 19BP option
All values at rated speed, power, and standard conditions, per SAE J1995 unless otherwise noted.
ust 2012 Engine Performance Curves 6068 - Marine Sheet 3 - August 2012
Engine Installation Criteria
Engine Performance Data Table
Engine Speed Crank Power Crank Torque * Prop Power * Prop Fuel * Prop BSFC
RPM kW hp Nm lb-ft kW hp L/hr gal/hr g/kW-hr
2700 265 355 937 691 265 355 69 18 222
2600 265 355 973 718 237 317 62 16 224
2500 265 355 1012 746 210 282 58 15 233
2400 265 355 1054 778 186 250 50 13 228
2300 265 355 1100 812 164 220 43 11 221
2200 265 355 1150 848 143 192 38 10 223
2100 258 347 1175 867 125 167 33 9 224
2000 248 332 1182 872 108 144 28 7 223
1900 231 310 1161 857 92 124 25 6 226
1800 212 284 1122 828 79 105 21 6 227
1700 189 253 1060 782 66 89 18 5 230
1600 158 211 941 694 55 74 15 4 229
1500 127 171 811 598 45 61 13 3 237
1400 108 144 733 541 37 50 10 3 237
1300 93 124 682 503 30 40 8 2 241
1200 81 109 647 477 23 31 7 2 252
1100 72 96 622 459 18 24 5 1 250
1000 62 83 593 437 13 18 4 1 275
* Theoretical 3.0 exponent propeller curve , measured at flywheel
Performance Curve: 6068SFM85_D
All values at rated speed, power, and standard conditions, per SAE J1995 unless otherwise noted.
ust 2012 Engine Performance Curves 6068 - Marine Sheet 4 - August 2012
