FOTON AUMAN TRUCKS Cummins ENGINE Fuel Injector 5491515FR

Shandong Shengyue Technology Development Co.,Ltd is one of the most professional foton auman trucks cummins engine fuel injector 5491515fr manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.

FOTON AUMAN TRUCKS Cummins ENGINE Fuel Injector 5491515FR

FUNCTION

1. Ultra-High Pressure Fuel Atomization: Integrated with the Cummins ultra-high-pressure common rail system, this injector instantly expels ultra-high-pressure fuel-delivered from the rail-through extremely fine, multi-orifice nozzles at the tip. This ensures that diesel mixes more uniformly within the combustion chamber and undergoes more complete combustion.
2. Microsecond-Precision Multi-Stage Injection: While traditional injectors typically perform only a single injection per stroke, the internal solenoid valve of the 5491515FR model boasts exceptionally high response speeds, enabling it to execute multiple injections within a single combustion cycle.
3. Precise Metering and Fuel Quantity Control: The injector strictly regulates the opening duration of its internal needle valve based on the pulse width of the electrical signals transmitted by the ECU. Regardless of operating conditions-whether idling, high-speed cruising, or climbing steep grades under heavy load-it precisely controls the fuel supply to each cylinder down to the milligram level, adjusting output according to the engine load. This approach significantly optimizes fuel efficiency while simultaneously ensuring maximum horsepower output.
4. Dynamic Pressure Balancing and Sealing: When not receiving electrical commands, the injector utilizes its internal control chamber, metering orifices, and springs to leverage the inherent high pressure of the common rail itself, thereby establishing a "hydraulic balance" between the upper and lower sections. This mechanism firmly locks the nozzle needle valve in place, ensuring that-even under extreme high-pressure environments-the injector remains absolutely free of any dripping, smoking, or premature pressure leakage. This stability maintains the integrity of the entire common rail system and safeguards the engine cylinders against potential thermal damage or melting.

DETAILS

Fault Diagnosis and End-of-Life Symptoms
1. Internal Valve Seat Wear (Excessive Return Flow): The truck is extremely difficult to start when the engine is hot; alternatively, while climbing a steep grade under heavy load, the dashboard suddenly triggers a "Low Common Rail Pressure" warning and imposes a speed limit.
2. Nozzle Needle Valve Stuck in Closed Position: A single cylinder fails to fire, causing severe engine vibration (misfiring/dead cylinder) and a drastic loss of power.
3. Nozzle Needle Valve Stuck in Open Position / Leaking: Fuel flow cannot be cut off, resulting in severe black smoke emission from the affected cylinder, excessively high exhaust temperatures, and potentially even "piston burning" or "cylinder scoring" caused by localized overheating.
4. IMA Code Mismatch or Missing: The engine exhibits irregular, slight, and intermittent vibrations while idling, accompanied by an abnormal contribution rate from a specific cylinder.

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Hot Tags: foton auman trucks cummins engine fuel injector 5491515fr, manufacturers, suppliers, factory, parts, genuine, original, Auman Silicon Oil Fan, Foton Auman turbocharger, Foton Engine Spare Parts, Foton Heavy truck Engine auto parts, FOTON SPARE PARTS, Foton truck Silicon Oil Fan