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John Deere Marine Engines

Features & Benefits
Performance Data
Marine Propulsion Ratings
Marine Generator Set Ratings
Engine Dimensions

Specifications
4045DFM marine diesel
4045TFM marine diesel
6068SFM marine diesel
6068TFM marine diesel
6081AFM marine diesel
6125AFM marine diesel
6125SFM marine diesel

Features & Benefits

Water-cooled turbocharger and exhaust manifold (4.5, 6.8, and 8.1 L)

Provides cooler and quieter performance for vessel and crew
Provides significant boost in efficiency and performance
Internal coolant passages eliminates hoses and fittings that can leak or break

Directed top-liner cooling (8.1 and 12.5 L)

Reduces upper liner temperature as much as 56°C (100° F)
Improves reliability and durability of the power cylinder

Replaceable wet-type cylinder liners

Provides excellent heat dissipation
Cast and precision machined and hardened for long life
Enables engine to be rebuilt to original factory specs-within the hull

Internal balancers (4.5 L)

Eliminates vibration and noise for crew comfort

Corrosion resistant components

Provides protection for the engine from the effects of seawater

Gear auxiliary drive

Gear-driven auxiliary drive provides reliable power
Can be used for wash-down pumps, hydraulic pumps, and misc. drives

Either side service

Oil fill and dipstick combinations
Oil and fuel filters can be engine or remote mounted
Application and service flexibility to provide installation convenience plus fast and easy maintenance

Poly-vee belt drive

Poly-vee belt provides increased capacity and flexibility with reduced maintenance
Belt guard designed for simple belt inspection and easy belt replacement

Heat exchanger or keel cooler (4.5, 6.8, 8.1 and 12.5L)

High-capacity heat exchanger designed for reliable operation in adverse conditions
Keel cooler option provides application flexibility

High torque and low rated rpm

Enables the engine to turn a "big wheel"
Provides good control and maneuverability
Low rated rpm limits vibration and noise for crew comfort

Electronically controlled governor (8.1 and 12.5 L)

John Deere Electronic Engine Control System (JDEC) with Engine Control Unit (ECU) that is remote mounted.
Excellent fuel economy

PowerTech Marine engines

Provide excellent performance, versatile power range, and unmatched service and application flexibility

Engine Model	Cyl.	Displacement	Marine Rating	Power Rating	Peak Torque	Fuel Consumption
Performance Data
4045DFM	4	4.5 L (276 cu.in.)	M2	80 hp (60 kW) @ 2500 rpm	296 Nm (218 lb-ft) @ 1400 rpm	17.5 L (4.6 gal)/hr
4045TFM	4	4.5 L (276 cu.in.)	M1	107 hp (80 kW) @ 2400 rpm	420 Nm (310 lb-ft) @ 1600 rpm	22.1 L (5.8 gal)/hr
			M2	121 hp (90 kW) @ 2500 rpm	448 Nm (330 lb-ft) @ 1700 rpm	23.4 L (6.1 gal)/hr
			M3	135 hp (101 kW) @ 2600 rpm	477 Nm (352 lb-ft) @ 1800 rpm	29.4 L (7.8 gal)/hr
			M4	150 hp (112 kW) @ 2600 rpm	508 Nm (375 lb-ft) @ 1800 rpm	29.7 L (7.8 gal)/hr
6068SFM	6	6.8 L (414 cu.in.)	M1	182 hp (136 kW) @ 2200 rpm	830 Nm (612 lb-ft) @ 1500 rpm	36.4 L (9.6 gal)/hr
			M1	249 hp (186 kwm) @ 2400 rpm	987 Nm (728 lb-ft) @ 1800 rpm	47.3 L (12.5 gal) / hr
			M2	208 hp (155 kW) @ 2300 rpm	853 Nm (629 lb-ft) @ 1600 rpm
			M2	280 hp (209 kWm) @ 2500 rpm	1037 Nm (765 lb-ft) @ 1900 rpm	52.2 L (13.8 gal) / hr
			M3	236 hp (176 kW) @ 2400 rpm	915 Nm (674 lb-ft) @ 1600 rpm	40.1 L (10.6 gal)/hr
			M3	321 hp (239 kWm) @ 2600 rpm	1111 Nm (820 lb-ft) @ 1900 rpm	60.2 L (15.9 gal) / hr
			M4	267 hp (199 kW) @ 2500 rpm	975 Nm (719 lb-ft) @ 1800 rpm	45.5 L (12.0 gal)/hr
			M4	355 hp (265 kWm) @ 2700 rpm	1188 Nm (876 lb-ft) @ 2000 rpm	67 L (17.7 gal) / hr
			M5	300 hp (224 kW) @ 2600 rpm	1005 Nm (741 lb-ft) @ 2000 rpm	51.6 L (13.6 gal)/hr
			M5	400 hp (298 kWm) @ 2800 rpm	1232 Nm (909 lb-ft) @ 2200 rpm	77.6 L (20.5 gal) / hr
6068TFM	6	6.8 L (414 cu.in.)	M1	154 hp (115 kW) @ 2300 rpm	682 Nm (503 lb-ft) @ 1600 rpm	29.7 (7.8 gal)/hr
			M2	175 hp (131 kW) @ 2400 rpm	688 Nm (507 lb-ft) @ 1800 rpm	34.7 L (9.2 gal)/hr
			M3	200 hp (149 kW) @ 2500 rpm	784 Nm (578 lb-ft) @ 1800 rpm	38.8 L (10.3 gal)/hr
			M4	225 hp (168 kW) @ 2600 rpm	784 Nm (578 lb-ft) @ 1800 rpm	44.3 L (11.7 gal)/hr
6081AFM	6	8.1 L (496 cu.in.)	M1	235 hp (175 kW) @ 2100 rpm	1082 Nm (798 lb-ft) @ 1500 rpm	43.9 L (11.6 gal)/hr
			M2	300 hp (224 kW) @ 2200 rpm	1220 Nm (900 lb-ft) @ 1700 rpm	56.6 L (15.0 gal)/hr
			M3	330 hp (246 kW) @ 2300 rpm	1268 Nm (935 lb-ft) @ 1900 rpm	62.3 (16.5 gal)/hr
			M4	375 hp (280 kW) @ 2400 rpm	1332 Nm (982 lb-ft) @ 2000 rpm	72.5 L (19.2 gal)/hr
6125AFM	6	12.5 L (766 cu.in.)	M1	341 hp (254 kW) @ 1800 rpm	1910 Nm (1409 lb-ft) @ 1200 rpm	66.2 L (17.5 gal)/hr
			M2	400 hp (298 kW) @ 1900 rpm	1910 Nm (1409 lb-ft) @ 1200 rpm	67.8 L (18 gal)/hr
			M3	455 hp (339 kW) @ 2000 rpm	2023 Nm (1492 lb-ft) @ 1600 rpm	92.1 L (24.3 gal)/hr
			M4	526 hp (392 kW) @ 2100 rpm	2202 Nm (1624 lb-ft) @ 1700 rpm	106.5 L (28.1 gal)/hr
6125SFM	6	12.5 L (766 cu.in.)	M1	380 hp (283 kW) @ 1800 rpm	2049 Nm (1512 lb-ft) @ 1300 rpm	73.7 L (19.5 gal)/hr
			M2	449 hp (335 kW) @ 1900 rpm	2240 Nm (1652 lb-ft) @ 1400 rpm	87.3 L (23.1 gal)/hr
			M3	526 hp (392 kW) @ 2000 rpm	2409 Nm (1777 lb-ft) @ 1500 rpm	102.1 L (27 gal)/hr
			M4	610 hp (455 kW) @ 2100 rpm	2647 Nm (1952 lb-ft) @ 1600 rpm	118.5 L (31.3 gal)/hr

Marine Ratings for propulsion
M1	For propulsion applications that may operate up to 24 hours/day at uninterrupted full power. These applications typically operate over 3,000 hours/year and have load factors over 65%. The M1 rating is the ISO 8665 "standard power" rating and the SAE J1228 "crankshaft power" rating. Possible Applications: Line haul tug and towboats, fish and shrimp trawlers/draggers, and displacement hull fishing boats over 60 ft (18 m).
M2	For propulsion applications that may utilize full power up to 16 out of each 24 hours of operation, with the remaining operation time at cruising speeds. These applications typically operate at full power up to 65% of the time and accumulate as many as 3,000 hours/year. Possible Applications: Short range tugs and tow boats (pool boats), long-range ferryboats, large passenger vessels, and offshore displacement hull fishing boats under 60 ft (18 m) long.
M3	For propulsion applications that may utilize full power up to 4 out of each 12 hours of operation. These applications typically operate at full power up to 35% of the time and accumulate as many as 2,000 hours/year. The remaining time of operation must be at cruising speeds. Possible Applications: Coastal fishing boats, offshore crew boats, research boats, short-range ferryboats, and dinner cruise boats.
M4	For propulsion applications that may utilize full power up to 1 out of each 12 hours of operation. The remaining time of operation must be at cruising speeds. These applications typically operate at full power up to 15% of the time and accumulate as many as 800 hours/year. Possible Applications: Inshore crew boats, charter fishing boats, pilot boats, dive boats, and planing hull commercial fishing boats.
M5	For propulsion applications that may utilize full power up to 30 min. out of each 6 hours of operation. These applications typically operate at full power up to 8% of the time and accumulate as many as 300 hours/year. Possible Applications: Recreational boats, tactical military vessels and rescue boats

Engine Model	Rated RPM	Engine Power	Calculated Prime Rating Range
Marine Generator Set Engine Ratings
4045DFM	1800 1500	62 hp (46 kW) 54 hp (40 kW)	40-42 kW (50-53 kVA) 35-37 kW (44-46 kVA)
4045TFM	1800 1500	98 hp (73 kW) 74 hp (55 kW)	64-47 kW (80-84 kVA) 48-51 kW (60-64 kVA)
6068SFM
6068TFM	1800 1500	148 hp (110 kW) 119 hp (89 kW)	97-101 kW (121-126 kVA) 78-82 kW (98-103 kVA)
6081AFM	1800 1500	261 hp (195 kW) 217 hp (162 kW)	171-179 kW (214-224 kVA) 142-149 kW (178-186 kVA)
6125AFM	1800	402 hp (300 kW)	264-276 kW (330-345 kVA)
6125SFM	1800 1500	438 hp (364 kW) 412 hp (307 kW)	320-335 kW (400-419 kVA) 270-282 kW (338-353 kVA)
*kVa is determined by 0.8 power factor

Engine Model	Length	Width	Height	Weight
Engine Dimensions*
4045DFM	885 mm (35.0 in)	713 mm (28 in)	911 mm (36 in)	437 kg (961 lb)
4045TFM	885 mm (35.8 in)	713 mm (28 in)	911 mm (36 in)	462 kg (1017 lb)
6068SFM	1183 mm (46.6 in)	721 mm (28.4 in)	619 mm (24.4 in)	636 kg (1402 lb)
6068TFM	1141 mm (44.9 in)	703 mm (27.7 in)	912 mm (35.9 in)	590 kg (1301 lb)
6081AFM	1299 mm (51 in)	787 mm (31 in)	687 mm (27 in)	853 kg (1881 lb)
6125AFM	1426 mm (56.1 in)	850 mm (33.5 in)	1138 mm (44.8 in)	1425 kg (3142 lb)
6125SFM	1801 mm (70.9 in)	1032 mm (40.6 in)	1150 mm (45.3 in)	1475 kg (3252 lb)
* Dimensions are based on engine with “standard configuration" including flywheel, flywheel housing, and electronics. Actual numbers may vary depending on selected options.