NGK IFR7F-4D 5115 Laser Iridium Spark Plugs for Yuchai Weichai Shangchai Heavy Duty Cummins FAW Jiefang CNG LNG Gas Tractor Semi-Trailer Bus Engine
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| Thread Specification | M14 × 1.25 |
| Thread Length | 19 mm (3/4\u201d) |
| Hex Wrench Size | 16 mm (5/8\u201d) |
| Heat Value Grade | 7 (NGK standard, cold type for high compression ratio gas engines) |
| Center Electrode Material | Laser Welded Iridium (LWI), ø0.6mm |
| Side Electrode Material | Platinum |
| Electrode Gap | 1.0 mm (factory preset, manual adjustment prohibited) |
| Seat Type | Flat Seat/Gasket Seat |
| Resistance Type | With resistor (Resistor, 5kΩ) |
| Applicable Fuel | CNG (Compressed Natural Gas) / LNG (Liquefied Natural Gas) |
| Original Part Number | 5115 |
| NGK Model Code | IFR7F-4D |
Manufacturer No.
IFR7F-4D5115
OEM Part No.
110R-000011
Engine Part No.
4DH8RSYuchai CNG SeriesWeichai CNG SeriesShangchai CNG SeriesSinotruk CNG/LNG
Fitment Vehicles
Yuchai Engine Heavy Duty Trucks/TrailersWeichai Engine Heavy Duty Trucks/TrailersShangchai Engine Vehicle ModelSINOTRUK CNG/LNG Gasoline VehicleFAW Jiefang CNG/LNG Gasoline VehicleCNG/LNG Urban Bus
Engine System - Industrial Encyclopedia
Original NGK IFR7F-4D (Part No. 5115) laser iridium spark plugs, designed for heavy commercial vehicle CNG/LNG natural gas engines. Perfectly compatible with Yuchai, Weichai, Shangchai and heavy-duty Cummins (SINOTRUK) main gas engine models (such as 4DH8RS), using laser-welded iridium center electrode and platinum side electrode to ensure ultimate ignition performance, high-temperature corrosion resistance and ultra-long replacement cycle, effectively improving combustion efficiency and cold start reliability.