Engine Specifications

General

ITEM	6081HFN01	6081HFN02	6081HFN03
Number of Cylinders	6	6	6
Bore	116 mm (4.56 in.)	116 mm (4.56 in.)	116 mm (4.56 in.)
Stroke	129 mm (5.06 in.)	129 mm (5.06 in.)	129 mm (5.06 in.)
Engine Displacement	8.1 liter (496 cu in.)	8.1 liter (496 cu in.)	8.1 liter (496 cu in.)
Compression Ratio	10:1	11:1	10:1
Intake Valve Clearance (Cold)	0.38 mm (0.015 in.)	0.38 mm (0.015 in.)	0.38 mm (0.015 in.)
Exhaust Valve Clearance (Cold)	0.51 mm (0.020 in.)	0.51 mm (0.020 in.)	0.51 mm (0.020 in.)
Spark Plug Gap (John Deere P/N RE51610, Marked RC78PYP)	0.38 mm (0.015 in.)	0.38 mm (0.015 in.)	0.38 mm (0.015 in.)
Rated Power	186 kW (250 hp)	209 kW (280 hp)	186 kW (250 hp)
Rated Speed	2200 rpm	2200 rpm	2200 rpm
Peak Torque	1094 N˙m (806 lb-ft) @ 1300 rpm1	1206 N˙m (900 lb-ft) @ 1600 rpm	1094 N˙m (806 lb-ft) @ 1300 rpm1
Slow Idle Speed	650 rpm	650 rpm	650 rpm
Engine Weight (Wet)	705 kg (1550 lb)	705 kg (1550 lb)	705 kg (1550 lb)

Lube System

ITEM	6081HFNO1	6081HFNO2	6081HFN03
Crankcase Capacity with Filter Change	23 L (24 qt)	23 L (24 qt)	23 L (24 qt)
Rated Oil Pressure (With Engine Warmed Up)	310 kPa (45 psi)	310 kPa (45 psi)	310 kPa (45 psi)
Idle Oil Pressure (Engine Warm)	207 kPa (30 psi)	207 kPa (30 psi)	207 kPa (30 psi)
Maximum Oil Pressure Spikes	827 kPa (120 psi)	827 kPa (120 psi)	827 kPa (120 psi)
Shutdown Oil Pressure	103 kPa (15 psi)	103 kPa (15 psi)	103 kPa (15 psi)

Cooling System

ITEM	6081HFN01	6081HFN02	6081HFN03
Maximum Top Tank Temperature	105°C (221°F)	105°C (221°F)	105°C (221°F)
Shutdown Temperature	112°C (234°F)	112°C (234°F)	112°C (234°F)
Thermostat Opening Temperature	89°C (192°F)	89°C (192°F)	89°C (192°F)
Thermostat Fully Open Temperature	100°C (212°F)	100°C (212°F)	100°C (212°F)
Minimum System Pressure	69 kPa (10 psi)	69 kPa (10 psi)	69 kPa (10 psi)

Air System

ITEM	6081HFN01	6081HFN02	6081HFN03
Maximum Pressure Drop Across Intercooler	13 kPa (1.9 psi)	13 kPa (1.9 psi)	13 kPa (1.9 psi)
Maximum Air Inlet Restriction	100 mm (4 in.) H2O - Clean	100 mm (4 in.) H2O - Clean	100 mm (4 in.) H2O - Clean
Maximum Air Inlet Restriction (Measured Between Air Cleaner and Turbo)	305 mm (12 in.) H2O - Dirty	305 mm (12 in.) H2O - Dirty	305 mm (12 in.) H2O - Dirty

Exhaust System

ITEM	6081HFN01	6081HFN02	6081HFN03
Maximum Exhaust Restriction	2.5 kPa (10 in. H2O)	2.5 kPa (10 in. H2O)	2.5 kPa (10 in. H2O)
Maximum Exhaust Restriction if Equipped with Catalyst	7 kPa (28 in. H2O)	7 kPa (28 in. H2O)	7 kPa (28 in. H2O)
Exhaust Temperature	585°C (1085°F)	585°C (1085°F)	585°C (1085°F)

Fuel System

ITEM	6081HFN01	6081HFN02	6081HFN03
Maximum Regulator Inlet Pressure2	24.8 MPa (3600 psi)	24.8 MPa (3600 psi)	24.8 MPa (3600 psi)
Minimum Recommended Regulator Inlet Pressure	2.1 MPa (300 psi)	2.1 MPa (300 psi)	2.1 MPa (300 psi)