4955525 Genuine MCRS Fuel Injector For Cummins QSK19 QSK38 QSK50 QSK60 | 4964171 High-Output Fuel System

The 4955525 injector is built around the "Modular" philosophy. Traditional common rail systems often suffer from hydraulic resonance-pressure waves that bounce back and forth in the rail, causing inconsistent fueling.

Integrated Dampening: The 4955525 features an internal high-volume accumulator that acts as a hydraulic "shock absorber." This dampens the pressure pulsations from the high-pressure pump, ensuring that the needle seat experiences a stable, laminar flow of fuel.

Structural Metallurgy: Crafted from high-tensile alloy steel with an optimized internal flow geometry, this injector is designed to resist the "cavitation erosion" typically seen in high-velocity diesel streams at 1600+ bar.

 

📊 Engineering Data & Specification Profile

 

Technical precision is the foundation of the 4955525's reputation in the field.

Technical Parameter	Specification Detail
Primary Part Number	4955525 / 4955525PX
Interchange Reference	4964171, 4088431, F 00B L0J 013 (System Group)
Engine Platform	Cummins QSK19, QSK38, QSK50, QSK60
System Architecture	Modular Common Rail System (MCRS)
Operating Pressure	1600 Bar (Up to 23,200 PSI)
Nozzle Technology	8-Hole Precision Spray Pattern

 

 

Procurement managers must look beyond the part number to ensure system longevity. Use this engineering selection logic for the 4955525:

Application Environment: The 4955525 is specifically calibrated for variable-speed industrial applications. If your engine is running at a constant "Power Gen" speed, verify that the fuel map on your ECM matches the response time of this specific solenoid revision.

Tier Transition: This unit is optimized for Tier 2/Stage II and certain Tier 3 transition engines. It provides the slightly higher mass-flow rate required for engines that do not utilize Exhaust Gas Recirculation (EGR).

Physical Port Matching: Ensure your high-pressure fuel lines utilize the "Heavy Duty MCRS" flared fittings. The 4955525 uses a specific inlet connector designed to prevent leakages under the high-vibration conditions of V16 mining engines.

 

 

The 4955525 is the powerhouse behind the world's most demanding machines:

Off-Highway Haulage: Powering the heavy-duty haulers in the Australian Outback and the Andes Mountains.

Commercial Marine: Providing the torque for deep-sea tugs and high-speed ferries.

Oilfield Services: The heart of fracturing pump engines that operate under sustained high-pressure loads.

Rail Traction: Reliable fueling for heavy freight locomotives utilizing the QSK platform.

 

 

To achieve the 15,000-hour design life of the 4955525, a rigorous maintenance protocol is non-negotiable.

The "Clearance" Factor: The internal needle-to-body clearance in a 4955525 is smaller than a human red blood cell. Use only NanoNet™ 2-micron filtration; anything less is an invitation for "needle scuffing."

Electrical Diagnostics: If your ECM throws a "Current Low" fault, check the resistance of the 4955525 solenoid. A healthy coil should show stable resistance even at high operating temperatures. If resistance fluctuates, the internal insulation is breaking down.

Sealing Integrity: Always replace the injector o-rings and the copper crush washer every time the injector is pulled. Reusing a washer leads to combustion gas blow-by, which will cook the injector body and seize it into the cylinder head.

 

 

Q1: Why does the 4955525 use a specialized 8-hole nozzle?

A: The 8-hole configuration is designed for maximum swirl-atomization. This ensures that the diesel is broken down into a fine mist that reaches the outer edges of the piston bowl, maximizing "Brake Thermal Efficiency" and reducing soot buildup.

Q2: Can the 4955525 be used with B20 Bio-Diesel?

A: Yes, but with caution. The 4955525 has high-grade internal coatings to resist the acidity of Bio-diesel, but you must monitor for "fuel dilution" in the oil, as Bio-diesel has a higher distillation temperature which can lead to incomplete combustion at idle.

Q3: What is the significance of the "PX" suffix in some 4955525 listings?

A: The "PX" usually denotes a factory-remanufactured unit. While these are cost-effective, ensure they were rebuilt in a Class 100 cleanroom, as any microscopic dust during the assembly of an MCRS injector will lead to failure within 50 hours.

Q4: How do I diagnose a "knocking" sound coming from a QSK50 equipped with these?

A: Use a "Cylinder Cutout Test." If cutting fuel to a specific 4955525 stops the knock, that injector is likely "over-fueling" due to a weak return spring or a worn nozzle tip that is staying open too long.

Q5: Is it necessary to update the ECM software when installing new 4955525 units?

A: It is recommended to check for the latest "Calibration Files." Newer software often includes refined "Pilot Injection" strategies that reduce the mechanical stress on the 4955525 during the initial ignition phase.

 

 

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