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Cummins/Onan QSK60-G6 NR2 Engine

The Cummins/Onan QSK60-G6 NR2 is a 60.2 L 16-cylinder turbocharged and low temperature after-cooled engine rated at 1800 rpm, producing up to 1905 kW. It powers generator sets from Cummins/Onan, including the 1750DQKAA, 2000DQKAB, DQKAA and DQKAB. It holds 334 L (88.2 gal) of oil and 492 L (130.0 gal) of coolant.

Also known as: Cummins Inc. QSK60-G6 NR2

Part of the Cummins/Onan QSK60G6 engine family — 2 variants share parts & fitment.

60.2 L

Displacement

Cylinders

1800 rpm

Rated speed

1905 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Torque & specs Fluids Fault codes Procedures Wiring

Engine specifications

Oil capacity	334.0 L
Coolant capacity	492.0 L
Displacement	60.2 L
Cylinders	16
Aspiration	Turbocharged and low temperature after-cooled
Rated speed	1800 rpm
Gross power	1905 kW

Generator sets powered by this engine

Cummins/Onan 1750DQKAACummins/Onan 2000DQKABCummins/Onan DQKAA Cummins/Onan DQKAB Cummins/Onan DQKAD Cummins/Onan DQKAE

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

Common problems

Emergency stop
Fix: Annunciated whenever either emergency stop signal is received from an external switch.
Battle short mode
Fix: If enabled and the battle short switch is active, some shutdown faults will be bypassed. However, emergency stop shutdowns and other critical faults are not bypassed.
General prime mover protection - Low and high battery voltage warning
Fix: Indicates status of battery charging system (failure) by continuously monitoring battery voltage.
Derate
Fix: The Derate function reduces output power of the genset in response to a fault condition. In utility parallel mode, it actively reduces power by lowering the base load kW to the derated target kW.
Under frequency shutdown 81u
Reverse power shutdown 32
General prime mover protection
Fix: Low and high battery voltage warning - Indicates status of the battery charging system (failure) by continuously monitoring battery voltage. Weak battery warning - The control system will test the battery each time the genset is signaled to start and indicate a warning if the battery indicates impending failure. Low coolant level warning – Can be set up to be a warning or shutdown.
Configurable alarm and status inputs
Fix: The control accepts up to four configurable alarm or status inputs. The control is programmable for warning, derate, shutdown, shutdown with cooldown or status indication and for labeling the input.
Weak battery warning
Cause: The control system will test the battery each time the genset is signaled to start and indicate a warning if the battery indicates impending failure.
Overspeed shutdown
Cause: Default setting is 115% of nominal.
Off load running (protection)
Cause: This feature protects the engine in the event the genset is being called to go off load for too long.
Low lube oil pressure warning/shutdown
Cause: Level is preset (configurable with InPower or HMI) to match the capabilities of the engine used. Control includes time delays to prevent nuisance alarms.
Low coolant temperature warning
Cause: Indicates that engine temperature may not be high enough for a 10 second start or proper load acceptance.
Low coolant level warning
Cause: Can be set up to be a warning or shutdown.
Low and high battery voltage warning
Cause: Indicates status of battery charging system (failure) by continuously monitoring battery voltage.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan QSK60-G6 NR2.

Maintenance schedule

Item	Spec	Capacity	Part #
Air filter	Dry replaceable element		—
Fuel filter	Dual element, 10 micron filtration, spin-on fuel filters with 15 micron water separator		—
Oil filter	Four spin-on, combination full flow filter and bypass filters		—
Battery	2200 amps minimum at -18C to 0C ambient, 24 volt negative ground		—
Coolant	Coolant capacity with standard set-mounted radiator	492.0 L	—
Oil	Lube oil capacity	334.0 L	—

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

Service specifications

Type	Item	Value	Unit	Condition
Other	AC waveform THD (THDV)	< 5	%	no load to full linear load
Other	AC waveform total harmonic distortion	< 5% no load to full linear load, < 3% for any single harmonic
Other	BMEP at set rated load (prime)	1885	kPa	prime rating
Other	BMEP at set rated load (standby)	2109	kPa	standby rating
Other	Breaker fail to synchronize default time delay	120	s	adjustable 10–900 s
Other	Compression ratio	14.5:1
Other	Derate above 1402 m (4600 ft) / 40 °C	4.5% per 305 m (1000 ft) and 11.0% per 10 °C (18 °F)		standby and prime
Other	Frequency regulation	Isochronous
Other	Governor regulation class	ISO8528 Part 1 Class G3
Other	High AC voltage shutdown default	110%	% of nominal voltage	for 10 s; adjustable 105–125%, 0.1–10 s
Other	Instantaneous pickup (Ii) range (Micrologic 3.0 and 5.0)	1.5–12 x In	x In
Other	Long-time delay tr	0.5–24	s	at 6 x Ir
Other	Long-time pickup (Ir) adjustment range	0.4–1.0 x In	x In	sensor plug rating In
Other	Low AC voltage shutdown default	85%	% of reference voltage	for 10 s; adjustable 50–95%, 2–20 s
Other	Over frequency shutdown/warning default	6	Hz above nominal	for 20 s, disabled; adjustable 2–10 Hz above set point, 1–20 s
Other	Over load (kW) warning default	105%	% of rated kW	adjustment range 80–140%, 0–120 s delay; default 60 s
Other	Piston speed	11.4	m/s
Other	Random frequency variation	± 0.25	%
Other	Reverse Var shutdown default	20%	% of rated Var	for 10 s; adjustable 15–50%, 10–60 s
Other	Reverse power shutdown default	10%	% of standby kW	for 3 s; adjustable 5–20%, 1–15 s
Other	Short circuit protection threshold	175%	% of rating	output current on any phase
Other	Telephone Harmonic Factor (THF)	< 3
Other	Telephone Influence Factor (TIF)	< 50	per NEMA MG1-22.43
Other	Under frequency shutdown default	6	Hz below reference	for 10 s; adjustable 2–10 Hz below set point, 5–20 s
Other	Wire stripping length	1.38 In (35 mm)	in
Pressure	BMEP at set rated load	2193	kPa	Prime rating
Pressure	BMEP at set rated load	2413 (350)	kPa (psi)	standby rating
Pressure	BMEP at set rated load	2710	kPa	Standby rating
Pressure	Maximum air cleaner restriction	3.7	kPa
Pressure	Maximum air cleaner restriction	6.2	kPa
Pressure	Maximum back pressure	6.7	kPa
Pressure	Maximum back pressure	6.8	kPa	exhaust
Pressure	Maximum back pressure	6.8 (27)	kPa (in H2O)
Pressure	Maximum cooling air flow static restriction	0.12	kPa
Pressure	Maximum fuel inlet restriction	16.9	kPa
Pressure	Maximum fuel inlet restriction	16.9 (5)	kPa (in Hg)
Pressure	Maximum fuel inlet restriction	30	kPa
Pressure	Maximum fuel return line restriction	34	kPa
Pressure	Maximum fuel return line restriction	34 (10)	kPa (in Hg)
Speed	Overspeed limit	2070	rpm
Speed	Overspeed limit	2100 ±50	rpm
Speed	Rated speed	1800	rpm	60 Hz
Temperature	Ambient design (standard set-mounted radiator)	50	°C
Temperature	Exhaust temperature at set rated load (prime)	463	°C	prime
Temperature	Exhaust temperature at set rated load (standby)	469	°C	standby
Temperature	Maximum aftercooler inlet temp	49	°C
Temperature	Maximum aftercooler inlet temp	66 (150)	°C (°F)
Temperature	Maximum fuel inlet temperature	71	°C
Temperature	Maximum jacket water outlet temp	104 (220)	°C (°F)	optional remote radiator cooling
Temperature	Maximum jacket water outlet temp (remote radiator)	104	°C	standby
Torque	Circuit breaker terminal tightening torque (AWG 1/0...750 kcmil)	548.75 Lbf.In (62 N.m)	Lbf.In	0.08…0.62 in² (50…400 mm²)
Voltage	Random voltage variation	± 0.5	%
Voltage	Standard temperature rise	150	°C	Standby at 40 °C ambient
Voltage	Voltage regulation, no load to full load	± 0.5	%

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Recommended fluids

Fluid	Grade	Standard	Notes
Fuel	ASTM D975 No. 2-D	ASTM D975 No. 2-D	Cetane number: 40-50. 300-500 ppm Sulfur.
Fuel	ASTM D975 No. 2-D, 300-500 ppm Sulfur	ASTM D975	Cetane number: 40-50. Reference conditions: air inlet temperature 25 °C (77 °F), fuel inlet temperature 40 °C (104 °F)
Fuel	Diesel

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Fault codes

Code	Name	Meaning	Severity	Action
27	Low AC voltage shutdown	Voltage on any phase has dropped below a preset value. Adjustable over a range of 50-95% of reference voltage, time delay 2-20 seconds. Default value is 85% for 10 seconds. Function tracks reference voltage.	Shutdown	Adjustable 50-95% of reference voltage, time delay 2-20 seconds; default 85% for 10 seconds.
32	Reverse power shutdown	Reverse power detected.	Shutdown	Adjustment range 5-20% of standby kW rating, delay 1-15 seconds; default 10%, 3 seconds.
40	Reverse Var shutdown	Shutdown level is adjustable: 15-50% of rated Var output, delay 10-60 seconds. Default: 20%, 10 seconds.	Shutdown	Adjustable 15-50% of rated Var output, delay 10-60 seconds; default 20%, 10 seconds.
46	Negative sequence overcurrent warning	Protects the generator from damage due to excessive imbalances in the three phase load currents and/or power factors.	Warning	Control protects generator from damage due to phase imbalance.
51	Overcurrent warning/shutdown	Implementation of the thermal damage curve with instantaneous trip level calculated based on current transformer ratio and application power rating.	Warning	AmpSentry protective relay action; see document R1053 time over current curve.
51G	Ground fault overcurrent	Detects a ground fault via external ground fault relay contact input or measured ground current from external CT.	Warning	Time delays and thresholds adjustable via InPower or HMI.
59	High AC voltage shutdown	Output voltage on any phase exceeds preset values; trip time inversely proportional to amount above threshold.	Shutdown	Adjustable 105-125% of nominal voltage, time delay 0.1-10 seconds; default 110% for 10 seconds.
81 u	Under frequency shutdown	Genset output frequency cannot be maintained. Settings adjustable 2-10 Hz below reference governor set point, 5-20 second time delay. Default 6 Hz, 10 seconds.	Shutdown
81o	Over frequency shutdown/warning	Genset operating at a potentially damaging frequency level. Adjustable 2-10 Hz above nominal governor set point, 1-20 second time delay. Default 6 Hz, 20 seconds, disabled.	Warning	Adjustable 2-10 Hz above nominal governor set point, 1-20 second delay; default 6 Hz, 20 seconds, disabled.
81u	Under frequency shutdown	Genset output frequency cannot be maintained. Settings are adjustable from 2-10 Hz below reference governor set point, for a 5-20 second time delay. Default: 6 Hz, 10 seconds.	Shutdown	Adjustable 2-10 Hz below reference governor set point, 5-20 second delay; default 6 Hz, 10 seconds.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Procedures

Trip Unit Operation Verification diagnostic

Tools: Trip unit test kit

Connect a test kit to the trip unit test plug receptacle.
Perform verification tests per instructions shipped with the test kit to verify trip unit functions.

Battery replacement / battery rack installation maintenance

Isolate DC supply before working on battery connections.
Install battery rack with hold-down, floor standing.
Install battery with minimum 2200 amps capacity at -18 °C to 0 °C.
Verify 24 volt negative ground connection.

Trip Unit Switch Adjustment operation

⚠ Wait a minimum of 15 minutes after circuit breaker trips before resetting to allow thermal imaging to reset completely to zero.

Tools: Wire seal MICROTUSEAL

Open switch cover.
Adjust the appropriate switches to desired values.
Replace switch cover.
Use wire seal MICROTUSEAL, if necessary, to provide tamper evidence.

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Voltage reconnection

Voltage	Phase	Connection	Leads	Notes
12470	3-phase	Wye, 3-phase		Winding No. 87; Feature Code B567; ADS-521; Temp rise 105/80 C; Duty S/P; Max surge kVA 6038
12470-13800	3	Wye, 3-phase	Winding no. 6062	Temp rise 125/105/80 °C; ADS-521; feature code B448; max surge kVA 91
12470-13800	3-phase	Wye, 3-phase		Winding No. 91; Feature Code B448; ADS-521; Temp rise 125/105/80 C; Duty S/P/C; Max surge kVA 6062
13200-13800	3-phase	Wye, 3-phase		Winding No. 91; Feature Code B612; ADS-521; Temp rise 105/80 C; Duty S/P; Max surge kVA 6062
13800	3-phase	Wye, 3-phase		Winding No. 91; Feature Code B610; ADS-521; Temp rise 80 C; Duty S; Max surge kVA 6833
220/380	3	6 leads	6	Winding no. 13; 125°C rise rating 2004 kW / 2505 kVA; stator resistance L-L 0.00102 Ohms; rotor resistance 2.31 Ohms @22°C
240/416	3	6 leads	6	Winding no. 13; 125°C rise rating 2004 kW / 2505 kVA; stator resistance L-L 0.00102 Ohms; rotor resistance 2.31 Ohms @22°C
254/440	3	6 leads	6	Winding no. 312; 125°C rise rating 2000 kW / 2500 kVA; stator resistance L-L 0.00152 Ohms; rotor resistance 2.31 Ohms @22°C
277/480	3	6 leads	6	Winding no. 312; 125°C rise rating 2080 kW / 2600 kVA; stator resistance L-L 0.00152 Ohms; rotor resistance 2.31 Ohms @22°C
277/480	3	Wye, 4 Wire		Feature code R002-2 Voltage-277/480, 3 Phase, Wye, 4 Wire
346/600	3	6 leads	6	Winding no. 07; 125°C rise rating 2080 kW / 2600 kVA; stator resistance L-L 0.00220 Ohms; rotor resistance 2.31 Ohms @22°C
380	3	Wye, 3-phase	Winding no. 7327	Temp rise 150/125/105 °C; ADS-335; feature code B595; max surge kVA 312
380	3-phase	Wye, 3-phase		Winding No. 13; Feature Code B595; ADS-515; Temp rise 150/125/105 C; Duty S/P/C; Max surge kVA 7327
4160	3	Wye, 3-phase	Winding no. 6307	Temp rise 125/105/80 °C; ADS-324; feature code B467; max surge kVA 51
4160	3-phase	Wye, 3-phase		Winding No. 51; Feature Code B467; ADS-518; Temp rise 125/105/80 C; Duty S/P/C; Max surge kVA 6307
440	3-phase	Wye, 3-phase		Winding No. 312; Feature Code B663; ADS-334; Temp rise 125/105/80 C; Duty S/P/C; Max surge kVA 7361
480	3	Wye, 3-phase	Winding no. 7361	Temp rise 125/105/80 °C; ADS-333; feature code B462; max surge kVA 312
480	3-phase	Wye, 3-phase		Winding No. 312; Feature Code B462; ADS-334; Temp rise 125/105/80 C; Duty S/P/C; Max surge kVA 7361
600	3	Wye, 3-phase	Winding no. 7361	Temp rise 125/105/80 °C; ADS-333; feature code B465; max surge kVA 07
600	3-phase	Wye, 3-phase		Winding No. 07; Feature Code B465; ADS-334; Temp rise 125/105/80 C; Duty S/P/C; Max surge kVA 7361

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

What is the oil capacity of the Cummins/Onan QSK60-G6 NR2?

The Cummins/Onan QSK60-G6 NR2 engine has an oil capacity of 334.0 liters.

What is the displacement of the Cummins/Onan QSK60-G6 NR2?

The Cummins/Onan QSK60-G6 NR2 has a displacement of 60.2 liters with 16 cylinders.

Which generators use the Cummins/Onan QSK60-G6 NR2 engine?

The Cummins/Onan QSK60-G6 NR2 powers 6 generator set(s), including Cummins/Onan 1750DQKAA, Cummins/Onan 2000DQKAB, Cummins/Onan DQKAA, Cummins/Onan DQKAB, Cummins/Onan DQKAD.

What is a common problem with the Cummins/Onan QSK60-G6 NR2 engine?

A commonly reported issue on generators using the Cummins/Onan QSK60-G6 NR2 is: Emergency stop. Fix: Annunciated whenever either emergency stop signal is received from an external switch..