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Doosan D146L Engine

The Doosan D146L is a 14.6 L -8-cylinder turbocharged, aftercooled engine rated at 1800 rpm. It powers generator sets from Kohler, including the 250REZX, 250RZX and 300REZX. It holds 47.1 L (12.4 gal) of oil and 43.2 L (11.4 gal) of coolant.

Also known as: Doosan D146L

14.6 L

Displacement

-8

Cylinders

1800 rpm

Rated speed

47.1 L

Oil capacity

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Engine specifications

Oil capacity	47.1 L
Coolant capacity	43.2 L
Displacement	14.6 L
Cylinders	-8
Aspiration	Turbocharged, Aftercooled
Rated speed	1800 rpm

Generator sets powered by this engine

Kohler 250REZX Kohler 250RZX Kohler 300REZX

How to read your Doosan engine serial & model number →

Maintenance schedule

Item	Spec	Capacity	Part #	Interval
Oil filter			—

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	10 in. weld flange bolt circle diameter B	361.95	mm (14.25 in.)
Other	10 in. weld flange outside diameter C	406.4	mm (16.0 in.)
Other	10 in. weld flange quantity of bolts / bolt hole diameter D	12, 25.40	mm (1.00 in.)
Other	12 in. weld flange bolt circle diameter B	431.80	mm (17.00 in.)
Other	12 in. weld flange outside diameter C	482.6	mm (19.0 in.)
Other	12 in. weld flange quantity of bolts / bolt hole diameter D	12, 25.40	mm (1.00 in.)
Other	14 in. weld flange bolt circle diameter B	476.25	mm (18.75 in.)
Other	14 in. weld flange outside diameter C	533.4	mm (21.0 in.)
Other	14 in. weld flange quantity of bolts / bolt hole diameter D	12, 28.58	mm (1.13 in.)
Other	16 in. weld flange bolt circle diameter B	539.75	mm (21.25 in.)
Other	16 in. weld flange outside diameter C	596.9	mm (23.5 in.)
Other	16 in. weld flange quantity of bolts / bolt hole diameter D	16, 28.58	mm (1.13 in.)
Other	18 in. weld flange bolt circle diameter B	577.85	mm (22.75 in.)
Other	18 in. weld flange outside diameter C	635.0	mm (25.0 in.)
Other	18 in. weld flange quantity of bolts / bolt hole diameter D	16, 31.75	mm (1.25 in.)
Other	20 in. weld flange bolt circle diameter B	635.00	mm (25.00 in.)
Other	20 in. weld flange outside diameter C	698.5	mm (27.5 in.)
Other	20 in. weld flange quantity of bolts / bolt hole diameter D	20, 31.75	mm (1.25 in.)
Other	5 in. weld flange bolt circle diameter B	215.90	mm (8.50 in.)
Other	5 in. weld flange outside diameter C	241.30	mm (9.50 in.)
Other	5 in. weld flange quantity of bolts / bolt hole diameter D	8, 22.23	mm (0.88 in.)
Other	6 in. weld flange bolt circle diameter B	254.0	mm (10.0 in.)
Other	6 in. weld flange outside diameter C	279.4	mm (11.0 in.)
Other	6 in. weld flange quantity of bolts / bolt hole diameter D	8, 22.23	mm (0.88 in.)
Other	8 in. weld flange bolt circle diameter B	298.45	mm (11.75 in.)
Other	8 in. weld flange outside diameter C	342.9	mm (13.5 in.)
Other	8 in. weld flange quantity of bolts / bolt hole diameter D	8, 22.23	mm (0.88 in.)
Other	Frequency regulation, no-load to full-load	Isochronous
Other	Frequency regulation, steady state	±0.5	%
Other	Weld flange angle A (10, 12, 14 in. nominal pipe size)	30	deg.
Other	Weld flange angle A (16, 18, 20 in. nominal pipe size)	22.5	deg.
Other	Weld flange angle A (5, 6, 8 in. nominal pipe size)	45	deg.
Pressure	Dual fuel engine, LPG vapor withdrawal fuel supply pressure	1.24	kPa
Pressure	LPG vapor withdrawal fuel supply pressure	1.24-2.74	kPa	measured at the generator set fuel inlet
Pressure	Max. restriction of cooling air, intake and discharge side of radiator	0.125	kPa
Pressure	Maximum allowable back pressure after catalyst	5.1	kPa
Pressure	Maximum allowable back pressure overall	10.2	kPa
Pressure	Natural gas fuel supply pressure	1.74-2.74	kPa	measured at the generator set fuel inlet downstream of any fuel system equipment accessories
Speed	Rated rpm	1800	rpm
Temperature	Ambient temperature	50	C	weather and sound enclosures with internal silencer reduce ambient temperature capability by 5C (9F)
Temperature	Exhaust temperature at rated kW, dry exhaust	600	C	at rated kW

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	Capacity	Notes
Engine oil	Kohler Genuine oil	42.1 L	Kohler recommends the use of Kohler Genuine oil and filters.
Fuel	LP Gas (Vapor)		Nominal fuel rating: LP vapor, 93 MJ/m3 (2500 Btu/ft.3); propane 85% min., lower heating value 84.2 MJ/m3 (2260 Btu/ft3) min.
Fuel	Natural Gas		Nominal fuel rating: Natural gas, 37 MJ/m3 (1000 Btu/ft.3); methane 90% min., lower heating value 33.2 MJ/m3 (890 Btu/ft3) min.

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
		12, Reconnectable	12	Alternator 4M4019, 12 lead
		12-lead optional voltage connections	12	Alternator optional feature
		4-lead dedicated voltages	4	Alternator standard feature
110/127/139/240/254/277	single-phase	switchable		Towable generator model specifications; some models n/a
208/220/240/415/440/480	3-phase	reconnectable		Towable generator model specifications
208/220/240/415/440/480	3-phase	switchable		Towable generator model specifications
600		4, 600 V	4	Alternator 4M4266, 4 lead

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 Doosan D146L?

The Doosan D146L engine has an oil capacity of 47.1 liters.

What is the displacement of the Doosan D146L?

The Doosan D146L has a displacement of 14.6 liters with -8 cylinders.

Which generators use the Doosan D146L engine?

The Doosan D146L powers 3 generator set(s), including Kohler 250REZX, Kohler 250RZX, Kohler 300REZX.