New High Quality Diesel Nozzle G3S10 for Injection Nozzle Diesel Engine Parts

Fuel quality issues: direct impact of impurities and pollution
1. Fuel impurities block the spray hole
Cause: Dust, metal particles, rust, colloids and other impurities contained in the fuel (especially when the fuel is of poor quality or the fuel filter fails) will flow through the nozzle spray hole with the high-pressure fuel, gradually deposit and block the aperture (usually only 0.1-0.3mm).
Typical case: using unfiltered fuel or not replacing the fuel filter for a long time, the spray hole is covered with colloids, resulting in distorted spray shape or even complete blockage.
2. Fuel moisture corrodes internal parts
Impact: Water mixed in the fuel (such as condensed water in the fuel tank, water inflow during transportation) will corrode metal parts such as the needle valve and valve seat, destroy the sealing surface accuracy, and cause fuel leakage or a drop in injection pressure.
Chain reaction: Metal debris produced by rust may further aggravate the wear of the spray hole, forming a vicious cycle of "rust-wear-blockage".
3. Improper or deteriorated fuel additives
Risk: Using inferior fuel additives (such as those containing highly corrosive ingredients) or long-term storage and deterioration of fuel (generating acidic substances) will corrode the rubber seals or metal surfaces inside the nozzle, causing the needle valve to get stuck or the seal to fail.

Mechanical wear and fatigue: Performance degradation after long-term work
1. Wear of the sealing surface of the needle valve and the valve seat
Mechanism: During high-pressure fuel injection, the needle valve and the valve seat frequently collide (up to dozens of times per second), and the flushing of impurities in the fuel will gradually flatten the sealing cone surface, resulting in poor sealing and fuel leakage.
Performance: The nozzle drips at idle speed, carbon deposits increase in the combustion chamber, and the engine is difficult to start or jitters at idle speed.
2. Spring fatigue or breakage
Function: The pressure spring inside the nozzle is used to maintain the preload when the needle valve is closed to ensure stable injection pressure.
Cause of failure: Under long-term high temperature and high pressure environment, the spring elasticity decays or breaks, resulting in reduced needle valve opening pressure, poor fuel atomization, and even "early injection" or "drip" phenomenon.
3. Leakage at the connection between the injector body and the nozzle
Installation problem: Aging of the gasket (such as copper gasket, O-ring), improper installation or insufficient tightening torque will cause high-pressure fuel to leak from the connection, affecting the injection pressure, and may also cause the risk of external fuel leakage.

Abnormal engine operating conditions: high temperature, carbon deposits and combustion shock
1. High temperature causes parts to deform or sinter
Scenario: Long-term high-load operation of the engine, cooling system failure or incomplete combustion (such as premature injection timing) will cause the combustion chamber temperature to rise abnormally and the nozzle head to overheat.
Consequence: The needle valve and the valve seat are stuck due to high-temperature deformation, or the fuel is carbonized and sintered at the spray hole, forming a carbon deposit hard block that blocks the spray hole (such as the "carbon deposit scab" phenomenon).
2. Combustion carbon deposits reversely contaminate the nozzle
Circulation impact: Carbon deposits in the combustion chamber (such as piston top and valve carbon deposits) will be washed to the nozzle surface during fuel injection, gradually accumulate around the spray hole, further aggravating the blockage; at the same time, carbon deposits will change the spray shape, resulting in more uneven combustion, forming a vicious cycle.
3. Abnormal combustion impact
Knock or pre-ignition: When knock is caused by injection timing errors, mismatched fuel grades, etc., the instantaneous high pressure in the cylinder will reversely impact the nozzle, accelerate the wear of the needle valve assembly, and even cause the nozzle to deform.
Electronic control system failure: signal abnormality and electromagnetic interference
1. Solenoid valve control failure
Circuit problem: Abnormal injection signal output by ECU (such as voltage fluctuation, line short circuit/open circuit) will cause the solenoid valve to fail to open and close the needle valve normally, resulting in "no injection", "continuous injection" or injection timing disorder.
Fault of the solenoid valve itself: aging of the coil, stuck armature or wear of the valve core, causing the solenoid valve to respond late or fail, affecting the injection control accuracy of the nozzle.
2. Abnormal fluctuation of common rail pressure
Related systems: In the common rail system, failure of the fuel metering valve and degradation of the high-pressure fuel pump performance will lead to unstable common rail pressure, and the nozzle injection pressure will fluctuate accordingly, causing the atomization effect to be good and bad, and the engine power to be strong and weak.