The Kubota V2403-K3A is a swirl chamber engine rated at 1500 rpm. It powers generator sets from Airman, including the SDG25LX-5B1N and SDG25S-3B1. It holds 9.5 L (2.5 gal) of oil.
Also known as: Kubota V2403-K3A
Part of the Kubota V2403 engine family — 2 variants share parts & fitment.
| Oil capacity | 9.5 L |
|---|---|
| Aspiration | Swirl chamber |
| Rated speed | 1500 rpm |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | 1609541711 | 1000 hr | PartsGeek | ||
| Fuel filter | 607 | 500 hr | PartsGeek | ||
| Oil filter | 51307 | 500 hr | PartsGeek $8.98 | ||
| Oil | — | 250 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Part # | Description | Category |
|---|---|---|
| 25-15073-00 | Gasket | gasket |
| 25-15569-00 | Gasket, Water Pump | gasket |
| 25-35136-05 | Gasket | gasket |
| 25-36121-00 | Gasket | gasket |
| 25-36540-00 | Gasket, Head Cylinder 135 | gasket |
| 25-36592-00 | Gasket | gasket |
| 25-36739-00 | Gasket | gasket |
| 25-37041-00 | Gasket, Oil Pump | gasket |
| 25-37156-00 | Gasket, Return Flange | gasket |
| 25-37558-00 | Gasket, Thermostat | gasket |
| 25-37561-00 | Gasket, Water Flange | gasket |
| 25-38541-00 | Gasket, Oil Filter Base | gasket |
| 25-38713-00 | Gasket, Head Cover | gasket |
| 25-38717-00 | Gasket, Case Cover | gasket |
| 25-39027-00 | Gasket, Oil Pan | gasket |
| 25-39028-00 | Gasket, Oil Pan Cover | gasket |
| 25-39376-00 | Gasket, Bearing Case | gasket |
| 25-39901-00 | Gasket, Gear Case | gasket |
| 25-39905-00 | Gasket | gasket |
| 25-39906-00 | Gasket, Pump | gasket |
| 25-39907-00 | Gasket, Pipe Joint | gasket |
| 25-38150-01SV | Glow Plug - Includes: | glow_plug |
| 25-15565-00 | Hose, Water Return | hose |
| 25-36597-00 | Hose Assembly | hose |
| 25-36120-00 | Injector Assembly - Includes:- Includes: | injector |
| 25-37079-00 | Filter, Oil | oil_filter |
| 30-00463-00P12 | Cartridge, Oil Filter | oil_filter |
| 25-15568-00SV | Water Pump Assembly - Includes: | pump |
| 25-36581-00 | Fuel Pump Assembly - Includes: | pump |
| 25-37040-00 | Oil Pump Assembly | pump |
| 25-39904-00 | Supply Pump Assembly - Includes: | pump |
| 25-36115-00 | O-Ring | seal |
| 25-36140-00 | O-Ring | seal |
| 25-36549-00 | O-Ring | seal |
| 25-36554-00 | O-Ring | seal |
| 25-36561-00 | O-Ring | seal |
| 25-36599-00 | O-Ring | seal |
| 25-37142-00 | O-Ring | seal |
| 25-37158-00 | O-Ring | seal |
| 25-37396-01 | Seal, Oil | seal |
| 25-38053-00 | Washer, Seal | seal |
| 25-38667-00 | O-Ring | seal |
| 25-39032-00 | O-Ring | seal |
| 25-39276-00 | O-Ring | seal |
| 25-39338-00 | Seal, Valve Stem | seal |
| 25-39799-00 | O-Ring | seal |
| 25-39890-00 | Seal, Oil | seal |
| 25-39902-00 | O-Ring | seal |
| 25-39911-00 | O-Ring | seal |
| 25-36163-00 | Sensor, Crank Angle | sensor |
| 25-39920-00 | Sensor | sensor |
| 25-39921-00 | Sensor, Water Temperature | sensor |
| 25-36167-00 | Thermostat Assembly | thermostat |
| 25-36203-00 | Thermostat Assembly | thermostat |
Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.
Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.
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.
The Kubota V2403-K3A engine has an oil capacity of 9.5 liters.
The Kubota V2403-K3A powers 2 generator set(s), including Airman SDG25LX-5B1N, Airman SDG25S-3B1.
The Kubota V2403-K3A uses oil filter part numbers Kubota 1641432434, Kubota 87415600, Donaldson P550318.
The Kubota V2403-K3A uses fuel filter part numbers Kubota 607, Donaldson P502161, Wix 33507.
The Kubota V2403-K3A uses air filter part numbers Kubota 1609541711, Donaldson P822768, Wix 46489.
The Kubota V2403-K3A oil change interval is every 250 hours.