Cummins 6CT Fuel Injector Catalog

The Cummins 6CT is one of the most widely used mid-range diesel engines, trusted in both industrial and marine applications for its reliability and power. To keep this engine running at peak efficiency, maintaining a healthy fuel injection system is critical. Fuel injectors directly control how fuel is atomized and delivered into the combustion chamber, making them essential to engine performance, fuel economy, and emissions control.

Below is a complete catalog of Cummins 6CT fuel injectors, injector kits, and injector seals. Each injector kit is designed for specific CPL (Control Parts List) numbers, which ensures proper compatibility with your exact engine configuration.

Injector Seals for Cummins 6CT

Cummins Injector Seal

• Description: One seal required per injector

• Application: Fits all Cummins 6CT injectors

• Notes: Seals are critical for preventing fuel leaks at the injector seating surface. Always replace seals when installing new or rebuilt injectors.

Injector Kits for Cummins 6CT Engines

Cummins Injector Kit for C Series Engines

• Compatibility: For engines with CPL numbers 2172 and 8089

• Quantity per Engine: 6 injectors

• Application: Standard kit for select Cummins C Series and 6CT models

• Details: Designed to deliver proper fuel atomization and pressure for these specific CPL calibrations.

Cummins Injector Kit for 6C, 6CT, and 6CTA Engines (4993482)

• Compatibility: For engines with CPL numbers 906 and 8017

• Application: Versatile kit covering both naturally aspirated and turbocharged versions of the 6CT

• Details: Precision-calibrated injectors designed to restore OEM-level performance and fuel efficiency.

Cummins Injector Kit for 6C, 6CT, and 6CTA Engines (3802288)

• Compatibility: For engines with CPL numbers 1262 and 1263

• Application: Recommended for specific industrial and power generation variants of the Cummins 6CT engine

• Details: High-quality injector assemblies engineered for long service life in demanding environments.

Why the CPL Number Matters When Selecting Injectors

When sourcing injectors for a Cummins 6CT engine, the CPL (Control Parts List) number is the single most important piece of information to identify the correct components.

What is the CPL Number?

The CPL number is Cummins’ way of identifying a specific engine build configuration. A single engine model, such as the 6CT, may be manufactured in dozens of different variations—each with unique calibrations for horsepower, torque, emissions compliance, and application (marine, industrial, power generation, etc.).

Why It’s Critical for Injector Selection

1. Fuel Delivery Calibration:
   Different CPLs may use injectors with unique flow rates, nozzle hole sizes, or spray patterns. Installing the wrong injector can cause poor combustion, excessive smoke, and reduced engine life.

2. Turbocharging & Aspiration Differences:
   Some 6CT engines are naturally aspirated, while others are turbocharged or turbocharged/aftercooled (6CTA). Each setup requires injectors matched to its air–fuel ratio requirements.

3. Horsepower & Torque Ratings:
   Injectors are tuned to support specific output levels. Using injectors not matched to your CPL may underfuel or overfuel the engine, hurting performance and efficiency.

4. Compliance & Emissions:
   Certain CPLs are calibrated to meet stricter emissions standards. Incorrect injectors can push the engine out of compliance and lead to regulatory issues.

How to Find Your CPL Number

The CPL number is stamped on the engine dataplate, typically located on the rocker cover or timing gear housing. Before ordering injectors, confirm your CPL number and match it with the compatible injector kit listed above.

Injector Maintenance & Replacement Guidelines for Cummins 6CT

Signs of Failing Injectors

• Hard starting or extended cranking

• White or black smoke under load

• Rough idle or misfiring

• Poor fuel economy

• Increased oil dilution (fuel in oil)

Best Practices for Injector Replacement

• Always replace injector seals during installation

• Verify torque specifications for the injector hold-downs

• Bleed air from the fuel system to prevent hard starts

• Check and, if necessary, clean fuel supply lines for contamination

• Replace injectors as a set for balanced cylinder performance

Why Choose Diesel Pro Power for Cummins 6CT Injectors

• Exact Compatibility: All injectors and kits listed are matched to specific CPL numbers to ensure perfect fit and function.

• Proven Reliability: Trusted by 40,000+ satisfied customers worldwide in both marine and industrial applications.

• In-Stock & Ready to Ship: Fast worldwide delivery reduces downtime.

• Expert Support: Our technical team can assist in verifying your CPL number and selecting the right injector kit for your application.