Diesel Fuel Injector Injection Nozzle 4088426 For Cummins QSK19 QSK60 Engine

Desc.

Injection Nozzle

Part No/TC type

4088426

Brand Name

Man, ABB, PBS, KBB, Napier MET, Weicai, JTH

Other parts

pls contact freely
if you need other P/N

Engine Type

Diesel engine,Gas engine,
Diesel Generators etc.

Spare Type

Cartridge, Nozzle ring , shaft, rotor complete, compressor wheel, diffuser, turbine casing , compressor casing , bearing casing, turbine blades, bearing

Condition:

Original , brand new, OEM, replacement, refurbished

Applicable industry

Marine engines,
Construction works ,oil platform
Energy & Mining etc

Key Word:

Original spare parts
and engine repair tool kits

Trade terms

FOB EXW CIF DDU DDP,

Door to door is available in some countries.

Delivery time:

Most parts are in stock, bulk order based on qty

Payment

T/T, L/C,D/A, Alipay, Western Union, Paypal etc.

Place of origin

China/Germany/South Korea USA/Japan/Sweden /UK/Singapore/Taiwan

Package

Neutral or original packaging

About the product

Fuel injectors currently used in automotive applications are essentially solenoid valves. When the solenoid coil is energized, it generates an electromagnetic force that lifts the needle valve and opens the nozzle orifice. Fuel then exits at high velocity through the annular clearance between the needle valve tip and the nozzle orifice, forming a fine mist that enhances combustion efficiency. In earlier diesel engines, mechanical fuel injectors were employed, which operated by precisely controlling the movement of paired components-specifically the needle valve and its corresponding valve body. These precision pairs, along with the plunger-plunger sleeve and delivery valve-delivery valve seat, constituted the three critical precision components in traditional diesel fuel systems.

In gasoline engines, fuel injectors are integrated into the electronic control system and have largely replaced carburetors in modern engine designs. Common types of fuel injectors used in vehicles include diesel, gasoline, and natural gas injectors. Some international manufacturers now offer hydrogen-specific injectors designed for alternative fuel applications.

Cleaning Considerations
The need for injector cleaning depends on operational performance and diagnostic evaluation. In electronically fuel-injected vehicles, fuel pump pressure remains constant regardless of throttle position. The fuel pressure regulator ensures that the pressure at the injector remains consistent under all operating conditions. Injectors must operate at their specified pressure to achieve optimal atomization. If the pressure falls below the design specification, fuel may exit as a liquid stream rather than a mist, reducing air-fuel mixing efficiency. Conversely, excessive pressure results in conical spray patterns that also hinder proper mixing and may cause fuel impingement on intake surfaces, adversely affecting the air-fuel ratio.

It is important to note that injection pressure should remain constant during both acceleration and idle conditions. However, the required pressure varies among different vehicle models. Some references to multi-level settings on cleaning equipment pertain to adapting to these model-specific pressure requirements-not variations due to engine load or speed. Misalignment of pressure settings can lead to inadequate atomization.

The quantity of fuel delivered is determined by the duration of injection. Fuel injectors are categorized into voltage-driven and current-driven types based on the control mechanism of the solenoid coil. Voltage-driven injectors are further classified as either high-impedance or low-impedance types. High-impedance injectors are compatible with standard 12V vehicle systems, whereas low-impedance injectors require specialized low-voltage drivers. Prolonged application of 12V to a low-impedance injector may result in overheating and damage to the coil windings.

During operation, the engine control unit supplies a steady voltage (typically 12V) to the injector, which is rapidly switched off when injection is no longer required. This switching occurs instantaneously, resembling binary logic transitions (0 and 1), without intermediate states. Therefore, the signal is a form of pulsating direct current (DC), not alternating current (AC). Alternating current involves periodic reversal of polarity, a characteristic found primarily in the unrectified output of vehicle generators. In most automotive systems, exposure to AC is limited to pre-rectification stages.

Injector cleaning becomes necessary when fuel delivery is restricted due to partial blockage or the accumulation of carbon deposits and gummy residues within the nozzle passages. Such conditions compromise injection volume and atomization quality, ultimately affecting engine performance and emissions.