The Piston,internal Combustion Engin, cataloged under National Stock Number 2805-00-459-2923, is classified within Federal Supply Class 2805 (Gasoline Reciprocating Engines, Except Aircraft; and Components) of the Engines, Turbines, and Components group. The manufacturer of record is Military Vehicles Opn General Motors Truck and Bus Group Ms 2603-02. Government technical data includes 28 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2805-00-459-2923 |
| Primary Part Number | 2424978 |
| Item Name | Piston,internal Combustion Engin |
| FSC / FSG | 2805 / 28 — Gasoline Reciprocating Engines, Except Aircraft; and Components |
| Manufacturer | Military Vehicles Opn General Motors Truck and Bus Group Ms 2603-02 |
| Status | ACTIVE |
| Carbon Groove | NOT INCLUDED |
| Ring Groove Width | 0.0950 INCHES NOMINAL SECOND RING IN |
| Ring Groove Width | 0.1880 INCHES NOMINAL FOURTH RING IN |
| Ring Groove Width | 0.0950 INCHES NOMINAL THIRD RING IN |
| Ring Groove Width | 0.0980 INCHES NOMINAL FIRST RING IN |
| Distance Between Pin Bosses | 1.500 INCHES NOMINAL IN |
| Retaining Ring Groove | INCLUDED |
| Surface Finish | FINISHED |
| Supplementary Features | OIL PASSAGE SLOT |
| Diameter | 5.162 INCHES NOMINAL IN |
| Ring Groove Diameter | 4.592 INCHES NOMINAL FIRST RING IN |
| Ring Groove Diameter | 4.592 INCHES NOMINAL SECOND RING IN |
| Ring Groove Diameter | 4.592 INCHES NOMINAL THIRD RING IN |
| Ring Groove Diameter | 4.650 INCHES NOMINAL FOURTH RING IN |
| Distance From Pin Hole Center to Extreme Top | 2.467 INCHES NOMINAL IN |
| Pin | INCLUDED |
| Pin Type for Which Designed | FLOATING |
| Oil Groove | INCLUDED |
| Head Style | DISH |
| Ring Groove Quantity | 4 |
| Oversize | 0.040 INCHES NOMINAL IN |
| Skirt Bottom Cutaway Feature | INCLUDED |
| Finished Size Designation | OVERSIZE |
| Ring | INCLUDED |
| Pin Hole Bushing | NOT INCLUDED |
| Material | ALUMINUM ALLOY |
| Skirt Type | SOLID |
| Cut Depth | 1.175 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2424978 PRIMARY | Military Vehicles Opn General Motors Truck and Bus Group Ms 2603-02 (USA) |
| Reference | Meaning |
|---|---|
| 2424978 | 5/9 Secondary reference General Motors Corp |
NSN 2805-00-459-2923 is a Piston,internal Combustion Engin, manufactured by Military Vehicles Opn General Motors Truck and Bus Group Ms 2603-02, classified under FSC 2805, Gasoline Reciprocating Engines, Except Aircraft; and Components. Status: active.
NSN 2805-00-459-2923 has 1 manufacturer part number on file: 2424978 (Military Vehicles Opn General Motors Truck and Bus Group Ms 2603-02).
1 possible match (shared part number, not a government interchangeability claim): 2805-01-179-5818. Verify interchangeability with system specifications before substitution.
Key specifications for 2424978: Overall Height: 4.625 INCHES NOMINAL IN; Carbon Groove: NOT INCLUDED; Ring Groove Width: 0.0950 INCHES NOMINAL SECOND RING IN; Ring Groove Width: 0.1880 INCHES NOMINAL FOURTH RING IN. 28 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.