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Kubota V2403M-BG Engine

The Kubota V2403M-BG is a 2.4 L 4-cylinder natural aspirated engine, producing up to 20 kW. It powers generator sets from Atlas Copco, including the QAS 20, QAS 20-25 Kd, QAS 25 and Qc1002. It holds 9 L (2.4 gal) of oil.

Also known as: Kubota V2403M-BG

Part of the Kubota V2403M engine family — 3 variants share parts & fitment.

2.4 L
Displacement
4
Cylinders
20 kW
Gross power
9.0 L
Oil capacity
On this pageService partsSpecsGenerator setsMaintenanceFilter cross-referenceFAQ

Service parts for the V2403M-BG

The cheapest captured merchant offer per filter — see the full cross-reference below for every OEM/aftermarket option.

Air intake

1 required
1310030160Air filtersee priceAmazon

Prices captured from merchant listings; some links are affiliate links. Verify against your serial number before ordering.

Engine specifications

Oil capacity9.0 L
Displacement2.4 L
Cylinders4
Aspirationnatural aspirated
Gross power20 kW

Generator sets powered by this engine

4
Atlas Copco QAS 20Atlas Copco QAS 20-25 KdAtlas Copco QAS 25Atlas Copco Qc1002

How to read your Kubota engine serial & model number →

Common problems

15
  • Winding failure.
    Fix: Check windings.
  • Unstable voltage
    Cause: Speed variation in engine.
    Fix: Check regularity of rotation.
  • Rotating bridge failure.
    Fix: Check diodes, disconnect cables.
  • Regulator out of setting.
    Fix: Regulate stability of regulator by acting on STABILITY potentiometer.
  • No residual voltage.
    Cause: Excite the alternator by applying a 12V battery voltage with a 30 W resistor in series on the + and - terminals of the electronic regulator, respecting the polarities.
  • Lower than rated voltage at load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage potentiometer.
  • Low voltage at no load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage.
  • Intervention of protection.
    Fix: Check frequency/voltage regulator.
  • Intervention by protection.
    Fix: Check frequency/voltage regulator.
  • Higher than rated voltage at load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage potentiometer.
  • High voltage at no load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage.
  • Failed regulator.
    Cause: Substitute regulator.
  • Current too high, power factor lower than 0.8; speed lower than 10% of rated speed.
    Cause: Failed regulator.
    Fix: Substitute regulator.
  • Alternator gives 0 Volt
    Cause: Blown fuse.
    Fix: Replace fuse.
  • After being excited the alternator still gives 0 Volt.
    Cause: Connections are interrupted.
    Fix: Check connection cables, measure winding resistances and compare with values mentioned in the alternator manual.

Compiled from service & troubleshooting documentation across every generator set that uses the Kubota V2403M-BG.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filterClean air cleaner and dust bowl, Replace air filter element (2)131003016050 hr Amazon eBay
Fuel filterCheck or drain water in fuelfilter/waterseparator, Replace fuel filter element, Replace fuel prefilter element—50 hr
Oil filterReplace engine oil filter (1)—50 hr
BatteryCheck electrolyte level and terminals of battery, Check engine mounts, Check crankcase ventilation system, Check condition of cooling fan assembly, Pressure test cooling system, Check engine electrical ground connection—50 hr
BeltCheck tension and condition of the drive belt/Replace—50 hr
CoolantCheck glycol level in coolant (3), Check PH level of engine coolant (3)—50 hr
OilHigh-quality, mineral, hydraulic or synthesized hydrocarbon oil with rust and oxidation inhibitors, anti-foam and anti-wear properties is recommended.5.6 L—50 hr
Spark plugReplace safety cartridge, Test glow plugs—50 hr

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

Filters for this engine

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

Also used in

6
  • Hyundai HSL650-7A — Skid Steer Loader
  • Kubota KC300H5 — Excavator Tracked
  • Kubota KC300HR5 — Excavator Tracked
  • Kubota L48 — Tractor
  • Kubota L48TL — Tractor
  • Kubota MX5000 — Tractor

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.

Common questions

What is the oil capacity of the Kubota V2403M-BG?

The Kubota V2403M-BG engine has an oil capacity of 9.0 liters.

What is the displacement of the Kubota V2403M-BG?

The Kubota V2403M-BG has a displacement of 2.4 liters with 4 cylinders.

Which generators use the Kubota V2403M-BG engine?

The Kubota V2403M-BG powers 4 generator set(s), including Atlas Copco QAS 20, Atlas Copco QAS 20-25 Kd, Atlas Copco QAS 25, Atlas Copco Qc1002.

What air filter does the Kubota V2403M-BG use?

The Kubota V2403M-BG uses air filter part numbers Atlas Copco 1310030160, Kubota 1609541711, Donaldson P822768.

How often should you change the oil in the Kubota V2403M-BG?

The Kubota V2403M-BG oil change interval is every 50 hours.

What is a common problem with the Kubota V2403M-BG engine?

A commonly reported issue on generators using the Kubota V2403M-BG is: Winding failure.. Fix: Check windings..