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Home›Engines›Cummins/Onan NT855-F3

Cummins/Onan NT855-F3 Engine

The Cummins/Onan NT855-F3 is a 14 L 6-cylinder turbocharged engine rated at 2100 rpm, producing up to 224 kW. It powers generator sets from Cummins/Onan, including the FIRE PUMP NT855-F3 BIG CAM. It holds 28.8 L (7.6 gal) of oil and 39.7 L (10.5 gal) of coolant.

Also known as: Cummins NT855-F3

Part of the Cummins/Onan NT855 engine family — 12 variants share parts & fitment.

14.0 L
Displacement
6
Cylinders
2100 rpm
Rated speed
224 kW
Gross power
On this pageSpecsGenerator setsMaintenanceFAQ

Engine specifications

Oil capacity28.8 L
Coolant capacity39.7 L
Displacement14.0 L
Cylinders6
AspirationTurbocharged
Rated speed2100 rpm
Gross power224 kW

Generator sets powered by this engine

1
Cummins/Onan FIRE PUMP NT855-F3 BIG CAM

How to read your Cummins/Onan engine serial & model number →

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterPart Number of Standard Air Filter Element ....................................................30222093022209 Amazon eBay $74.95 FridayParts $44.99
Fuel filterPart Number of Standard Fuel Filter.................................................................................. 33158473315847 Amazon eBay $16.99 FridayParts $41.10
Oil filterPart Number of Standard Oil Filter Element ......................................................................3889310—
Battery—
Belt—
Coolant filter—
OilFull Flow Lube Oil Filter Capacity - U.S. gal. (litre).............................................................7.6 (28.8)7.6 U.S. gal—
Spark plug—

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Parts cataloged across the Cummins/Onan NT855 family

143
Part #DescriptionCategory
140-2389140-2391 1 140-2390 1 140-2392 1 140-2393 1 140-1548 1 140-1545 1 c 503-1575 186917 CAir filter
140-2391Element - Air Cleaner (Standard)Air filter
8342-1AIR FILTERAir filter
CS-1382cINLET AIR DAMPERAir filter
ES-1214-2FLOAT SWITCHAir filter
191-1982Pulley, AlternatorAlternator
191-1983-02Alternator, 24 Volt Spec B-O (Prestolite)Alternator
A9562-12 VOLT BATTERIESBattery
2110153Bell, End - Alt, to ExciterBell
511-0092Belt, AlternatorBelt
805-35Bolt, Place - Generator Mtg. Support to End BellBolt
1S0A713Bracket, Overspeed SwitchBracket
2348115Bracket, Mtg. - Volt. Cont. ReactorBracket
234875Bracket, Gate Reactor Mtg.Bracket
319-2236Bracket, MountingBracket
234070Rig Assy., Brush- Incl. Brushes, & Contact Point Band, Gen. - Front Portion(Narrow)Brush
2I4AMBrushBrush
518-0548-58Clamp, HoseClamp
2340116Cover, ExciterCover
0300-4623-08DFBF (600V)Current transformer
0300-4623-23DFBF BR (0-480V)Current transformer
FS1803sFUEL FILTERSFuel filter
FP-3019158Gasket, Water OutletGasket
FP-3020943Gasket, Exhaust ManifoldGasket
FP-KS12622ANH/NT855 In-Frame Kit w/upper gasket set & oil pan gasketGasket
FP-KS12622CNH/NT855 In-Frame Kit w/upper gasket set & oil pan gasketGasket
FP-KS12622C7NH/NT855 In-Frame Kit w/upper gasket set & oil pan gasketGasket
FP-KS12622DNH/NT855 In-Frame Kit w/upper gasket set & oil pan gasketGasket
M-4024945Edge molded rubber head gaskets setGasket
232A1817GeneratorGenerator
502-0827Fitting, Hose – Barbed (1/2” ID Pipe to 3/4” ID Hose)Hose
503-0189Clamp, HoseHose
503-1634-01Hose, Rubber (3/4” ID x 4”)Hose
FP-3013591Piston Cooling NozzleInjector
FP-3054058Injector, NewInjector
FP-3054250Injector, NewInjector
302P465RESISTOR-STABILIZINGMeter
302P466For 220/380-V, 3-Ph, 60-Cycle (Model H)Meter
302P468For 120/208-V,120/240-V, & 347/600-V 3PH. 50 Cy!. (825-Ohm, 75-Watt)Meter
302P469For 220/380-V, 3Ph. 50-CycleMeter
302P470For 277/480-V, 3-Ph, 50-Cyclo (5-P!)Meter
102-1335Plug, Oil DrainService part / kit
130-3588Cap, RadiatorService part / kit
130-4355Radiator (2 Row Core) DFBJService part / kit
130-4355-01Radiator (3 Row Core) DFCF, DFCGService part / kit
130-4369Radiator DFCHService part / kit
155-2409-01Elbow, Exhaust (5" OD With Threads)Service part / kit
191-1981Genset component (SJB series)Service part / kit
191-2121Regulator, VoltageService part / kit
232A1489Generator support shim, 0.598 in gauge #6, 3x3Service part / kit
232A1490Generator support shim, 0.359 in gauge #20, 3x3Service part / kit
301021151Box Only, controlService part / kit
30118301Bracket, Cont.Box Mtg. (Repl. 2-Piece Brkts)Service part / kit
301A1914Bracket, Panel StopService part / kit
301A2727Handle , Control BoxService part / kit
302-21360-CycleService part / kit
302-234.CycleService part / kit
3028448Plate, Mater FaceService part / kit
302P411302P412Service part / kit
302P412Scale Reads 0-250Service part / kit
302P414Amm, Scale Reads 0-300 - Replaces 302-14.Service part / kit
302P415Ammeter Scale Reads 0-500 - Replaces 302-371.Service part / kit
302P422302P423Service part / kit
302P423Scale Reads 0-750 on side of GenService part / kit
302P467For 277/480 Volt,3 Phase, 60 Cycle Plants.Service part / kit
303-111Rheostat, Volt. Reg. - 175-Ohm, (Model H)Service part / kit
303-32Knob, RheosService part / kit
304030545, 000-Ohm, 10-W - For 480-V , 3-Ph, 3-Wire & 277/480-V, 3+ Ph.Service part / kit
307-2621-02Relay, Start Solenoid (K4)Service part / kit
308-22Switch, Volt. & Current Selector AmmeterService part / kit
320823-Phase ModelsService part / kit
320B18Single Phase ModelsService part / kit
333-0639-01Heater, Coolant (4990 Watt)Service part / kit
333-0639-02Heater, Coolant (6420 Watt)Service part / kit
337A44Strap, GroundService part / kit
402-78Rubber, Mtg. - Cont. BoxService part / kit
503-1575Clamp, V-BandService part / kit
504-0011Valve, Shutoff (1/2”)Service part / kit
505-0019Bushing, Pipe - Reducer 1/2” to 3/8”, DFBF (1/2” to 3/8”) 505-0131 DFCB, DFCC, DFCE (3/4” to 3/8”)Service part / kit
505-0100Nipple, Pipe - Close (1/2”)Service part / kit
526-0029*Washer, Flat (1/2")Service part / kit
526-0219Washer, Flat (1/2)Service part / kit
800-0048Screw, Cap - Hex Head (3/8-16 x 3/4”)Service part / kit
800-0092Screw, Cap - Hex Head (1/2-13 x 1.5)Service part / kit
850-0050Washer, Lock - Spring (3/8”)Service part / kit
870-0212Nut, Locking (1/4-20)Service part / kit
903-0124NAService part / kit
903-0204NAService part / kit
903-0500NAService part / kit
903-0604NAService part / kit
EXS-1046sCONDENSATION TRAPService part / kit
FP-855PREMNH/NT855 Premium Cylinder KitsService part / kit
FP-855TTNT855 Premium 3-Ring Cylinder KitsService part / kit
FP-855TTDNNT855 Premium 3-Ring Cylinder Kits Dual-NI PistonsService part / kit
FP-855TTPNT855 Premium Plus 3-Ring Cylinder KitsService part / kit
FP-855TTPDNNT855 Premium Plus 3-Ring Cylinder Kits Dual-NI PistonsService part / kit
FP-IFK855NRNT855 Cylinder Kits w/ no piston ringsService part / kit
FP-IFK855PREMNH/NT855 Premium Cylinder KitsService part / kit
FP-IFK855TTNT855 Premium 3-Ring Cylinder KitsService part / kit
FP-IFK855TTDNNT855 Premium 3-Ring Cylinder Kits Dual-NI PistonsService part / kit
FP-IFK855TTPNT855 Premium Plus 3-Ring Cylinder KitsService part / kit
FP-IFK855TTPDNNT855 Premium Plus 3-Ring Cylinder Kits Dual-NI PistonsService part / kit
FP-KS12621CNH/NT855 Cylinder Kit Std Head Gask GrommetsService part / kit
FP-KS12621C7NH/NT855 Cylinder Kit .010 Head Gask GrommetsService part / kit
FS1692sFUEL SOLENOID VALVE LOCATIONService part / kit
M-1808DC CONTROL WIRINGService part / kit
TB11-29Engine Monitor BoardService part / kit
TB11-30Engine Monitor BoardService part / kit
TB11-31Engine Monitor BoardService part / kit
234C1343-PhasePhase
234C1373-PhasePhase
234C140Single PhasePhase
234C141Single PhasePhase
FP-AR10172Pump, Oil (New)Pump
305P233Rectifier, Lower Two, Neg. - Begin Spec BRectifier
305P234Rectifier Assy., Power (Field) (Incl. in Rect. #305P218)Rectifier
305P240Rectifier, Volt. Cont.Reactor (Incl.in Rect. & Resistor A: 305P218)Rectifier
3ISA78Rectifier, Voltage ControlRectifier
304412515,000-Ohm, 25-W - For 220/380-V, 3-Phase, 4-WireResistor
304PA76Resistor, Volt. Cont.Reactor (Incl.in Rect.& Resistor A: 305P218)Resistor
3058227Resistor Assy., Rect, & Incl. (Incl.in Rect. & Resistor A: 305P218)Resistor
204493Ring, CollectorRing
508-0292Washer, Sealing - CopperSeal
DM-3010461Crankshaft Rear Seal - NT855, NTC855Seal
FP-3024709Seal Ring, Water ManifoldSeal
193-0432Sender, Oil Temperature (S2 Engine Block, E4 Oil Pan)Sensor
193-0447-01Sender, Water Temperature (E2)Sensor
193-0448Sender, Oil PressureSensor
309-0269Sender, Temperature-Lo EngineSensor
309-0576Switch, Thermostat - High Engine Coolant Temperature (S2)Sensor
309-0641-03Switch, Oil Pressure (Closes at 14 lbs. Descending) (S1)Sensor
309-0641-07Switch, Oil Pressure (Closes at 20 lbs. Descending)Sensor
960-0504PCC Control Service ManualService manual
960-0507Detector Control Service ManualService manual
191-1858Starter (24VDC)Starter
3320645Strip, Marker - Volt. Con. Reactor (9305P218)Strip
5208190Stud, Fixed Resistor Mtg.Stud
23201396Support, Gen. Mtg.Support
1S0A717Switch Assy., OverspeedSwitch
FP-3076489ThermostatThermostat
B-342-3sPRIMING TURBOCHARGER OIL SUPPLY INLET LINE. DISCONNECT AT THIS POINT TO PRIMETurbocharger
302P421Scale Reads 0-300Voltmeter
304A15S Washer, Fixed Resistor Cent. to Alternator End BellWasher

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

Common questions

What is the oil capacity of the Cummins/Onan NT855-F3?

The Cummins/Onan NT855-F3 engine has an oil capacity of 28.8 liters.

What is the displacement of the Cummins/Onan NT855-F3?

The Cummins/Onan NT855-F3 has a displacement of 14.0 liters with 6 cylinders.

Which generators use the Cummins/Onan NT855-F3 engine?

The Cummins/Onan NT855-F3 powers 1 generator set(s), including Cummins/Onan FIRE PUMP NT855-F3 BIG CAM.