Cummins 4955850 Natural Gas Engine Spark Plug Set (6pcs) Including 4937472 Single with Adapter for ISL G ISC G L9N QSL9 G
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| Part Number | 4955850 (Kit) / 4937472 (Individual) |
| Manufacturer Model | Denso GK3-7 / IR3 |
| Spark Plug Type | Long-life iridium-platinum alloy |
| Thread Specification | M14 × 1.25 |
| Thread Insert Length | 19 mm (3/4\u201d) |
| Hex Wrench Size | 5/8” (16 mm) |
| Center Electrode Material and Diameter | Iridium gold/0.4 mm fine wire |
| Side Electrode Material and Process | Platinum / 360° Laser Welding |
| Electrode Gap | 0.7–0.8 mm (factory preset, non-adjustable) |
| Heat Value Grade | Denso Heat Value 3 (Cool Type, Equivalent to NGK 7-8 Grade) |
| Resistance Value | 5 kΩ |
| Applicable Fuel | Compressed Natural Gas (CNG) / Liquefied Natural Gas (LNG) |
| Working Voltage Range | 30–40 kV |
| Package Included | 6 Spark Plugs + High-Tension Wire Harness (674-1001) + Insulating Grease (Depending on the Specific Kit) |
| Replacement Cycle | Recommended 50,000–80,000 km or as per engine maintenance manual |
Manufacturer No.
GK3-7674-2000105001105002IR3674-1001
OEM Part No.
49558504937472397611954730104989131397935954730095473010
Engine Part No.
ISL GISC GISL8.3GISL8.9GL9NQSL9 GC8.3GC GAS PLUSL GAS PLUSB5.9G6BT5.9GISB5.9GCM556CM2180CM2380CM558
Interchange No.
674-2000GK3-7FF-2006128RH10C21639644084089629
Fitment Vehicles
Cummins ISL G Series Natural Gas EngineCummins ISC G SeriesCummins L9NCummins QSL9 GCummins 6CT Natural Gas VersionCummins 6BT5.9 Natural Gas VersionDongfeng/Komatsu Natural Gas VehicleGenerator SetBusHeavy Duty Truck
Engine System - Industrial Encyclopedia
Professional supply of Cummins original 4955850 spark plug set (6pcs), core component is 4937472 iridium-platinum spark plug, precisely fits ISL G, ISC G, L9N, QSL9 G and other 8.3L/8.9L natural gas/CNG engines. Interchange numbers cover 3976119, 5473010, 4989131, Denso GK3-7/674-2000 and Champion RH10C, Autolite 216 and other mainstream replacement parts. The product uses a 0.4mm fine wire iridium center electrode and 360° laser welding platinum side electrode, resistant to high temperature and carbon accumulation, strong ignition energy, significantly improving combustion efficiency and emission performance, original factory quality assurance, wholesale and retail in stock delivery.