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Isuzu AA-4LE2 Engine

The Isuzu AA-4LE2 is a 2.18 L 4-cylinder turbocharged engine rated at 1800 rpm, producing up to 26.8 kW. It powers generator sets from MQ Power, including the DCA 25 SSIU, DCA-25SSI, DCA-25USI and DCA25SSIU2. It holds 8.5 L (2.2 gal) of oil and 6.6 L (1.7 gal) of coolant.

Also known as: Isuzu AA-4LE2

2.179 L

Displacement

Cylinders

1800 rpm

Rated speed

26 kW

Gross power

On this pageSpecs Generator sets Maintenance FAQ Service intervals Torque & specs Procedures

Engine specifications

Oil capacity	8.5 L
Coolant capacity	6.6 L
Displacement	2.179 L
Cylinders	4
Aspiration	turbocharged
Rated speed	1800 rpm
Gross power	26 kW

Generator sets powered by this engine

MQ Power DCA 25 SSIUMQ Power DCA-25SSI MQ Power DCA-25USI MQ Power DCA25SSIU2 MQ Power DCA25USI

This engine also powers 27 machine(s) on Power Equipment Info.

Maintenance schedule

Item	Capacity	Part #	Interval
Air filter		—	50 hr
Fuel filter		—
Oil filter		—
Battery		—
Belt		—
Coolant	6.6	—
Oil	8.5	—
Spark plug		—

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

Service intervals

Item	Action	Hours	Months	Notes
Air cleaner element	Clean	50 hr		Remove and clean heavy duty paper element with kerosene, or foam element with liquid detergent and hot water

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

Service specifications

Type	Item	Value	Unit	Condition
Speed	Engine speed (frequency) after adjustment	52	Hz	50 Hz operation
Speed	Standard engine speed (frequency)	62	Hz	before derating
Speed	Unit operating frequency	50	Hz	after derating adjustment

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

Procedures

Overseas Tier II Engine Speed Reduction for 50 Hz adjustment

⚠ FOR USE ON OVERSEAS UNITS ONLY

⚠ UNIT WILL BE DERATED AFTER ADJUSTMENT

⚠ A QUALIFIED ELECTRICAL TECHNICIAN MUST MAKE ALL ADJUSTMENTS. MQ POWER IS NOT RESPONSIBLE FOR ANY DAMAGES TO EQUIPMENT AND/OR COMPONENTS RESULTANT FROM UNQUALIFIED PERSONNEL.

Locate the engine speed adjustment screw and jam nut on the injection pump governor housing (Figure 1).
Loosen the jam nut of the engine speed adjustment screw by turning the jam nut counter clockwise approximately three (3) turns (Figure 2).
Start and run the engine using the normal starting procedures.
While observing the engine speed and the frequency, turn the engine speed adjustment screw counter clockwise until the proper frequency is achieved.
Maintain position on the engine speed adjustment screw and tighten the jam nut by turning the jam nut clockwise until tight (Figure 3).
Should any adjustment errors occur, verify frequency and adjust as needed by following Steps 1 thru 5.

Testing The Voltage Selector Switch diagnostic

⚠ ALL ADJUSTMENTS MUST BE MADE BY A QUALIFIED ELECTRICAL TECHNICIAN. MQ POWER IS NOT RESPONSIBLE FOR ANY DAMAGES TO EQUIPMENT AND/OR COMPONENTS RESULTANT FROM UNQUALIFIED PERSONNEL.

⚠ DO NOT remove metal jumpers during testing

⚠ DO NOT remove wire jumpers during testing

Give a thorough visual inspection of the Voltage Selector Switch, looking for burned spots, discoloration, smoke damage and/or damaged cabling.
Rotate the switch with the unit not running; ensure proper rotation with no sticking between positions or a locked switch.
If any of the above faults are found, replace the switch. If no faults are found, proceed to Step #2.
Remove the Voltage Selector Switch from its housing, disconnecting all cabling EXCEPT the large cable jumpers, the metal jumpers, and the wire jumpers (block to block).
With the switch removed and placed on a bench, test the switch following the attached contact diagram in all three (3) positions.
If any contacts test the opposite of the diagram, replace the switch and rewire per the Generator Wiring Diagram in the Unit Instruction Manual.

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 Isuzu AA-4LE2?

The Isuzu AA-4LE2 engine has an oil capacity of 8.5 liters.

What is the displacement of the Isuzu AA-4LE2?

The Isuzu AA-4LE2 has a displacement of 2.179 liters with 4 cylinders.

Which generators use the Isuzu AA-4LE2 engine?

The Isuzu AA-4LE2 powers 5 generator set(s), including MQ Power DCA 25 SSIU, MQ Power DCA-25SSI, MQ Power DCA-25USI, MQ Power DCA25SSIU2, MQ Power DCA25USI.