Caterpillar original Common Rail Fuel Injector 392-6214 386-1766 for Mining Heavy Construction Machinery, Replacement for OEM 250-1312, Compatible with Diesel Engines 250-1308 original new injector

Engineered for Caterpillar 3500 Series diesel engines, the CAT 392-6214 common rail fuel injector provides the precise, high-pressure fuel metering that heavy-duty power applications demand. As the final metering component in the fuel delivery system, it receives diesel fuel under high pressure, lifts the needle valve at the specified injection pressure, and atomizes fuel into the combustion chamber for complete, efficient combustion. Accurate injection timing and an optimized spray pattern deliver stable idle, higher power output, reduced fuel consumption, and lower emissions across the full operating range.

Manufactured to meet OEM standards, the injector assembly pairs a precision nozzle design with hardened, corrosion-resistant materials, ensuring durability under extreme industrial and marine operating conditions. OEM tolerance compliance guarantees a direct fit and dependable interchangeability across an extensive cross-reference database—3926214, 20R-1275, 386-1766, 20R-1262, 192-2817, 392-0215, 392-0216, 250-1314, 437-7547, and 359-5469—simplifying parts sourcing, verification, and inventory management for distributors, fleet operators, and MRO facilities.

Compatibility covers CAT 3512B engines together with related 3508B and 3516B models in heavy-duty, marine, and industrial genset configurations, serving equipment such as industrial gensets, marine vessels, mining trucks, construction machinery, oil and gas installations, and stationary compression power. For maximum service life, routine maintenance—including fuel filter replacement, injector performance testing, fuel pressure inspection, and fuel quality assessment—helps prevent common failure symptoms such as black smoke, rough idle, hard starting, and power loss.