Detroit Diesel 6-71 Non-Turbo (4 Valve Head Type) – Injector Catalog

The Detroit Diesel 6-71 is one of the most iconic two-stroke diesel engines in history, widely used in marine, industrial, and heavy-duty vehicle applications for decades. Known for its reliability, rugged construction, and distinctive sound, the 6-71 was produced in both turbocharged and naturally aspirated versions. The non-turbo 4-valve head variant delivers exceptional airflow and combustion efficiency compared to older 2-valve designs, making it a preferred choice for many operators.

At the heart of this engine’s performance is the injector system. The injectors ensure precise fuel delivery, atomization, and timing, all of which are crucial for smooth combustion and maximum power output. This catalog is designed to provide operators, mechanics, and fleet managers with a comprehensive reference of injectors, timing tools, service kits, and related components specific to the Detroit Diesel 6-71 Non-Turbo 4V engine.

Why Fuel Injectors Matter in the 6-71 Non-Turbo

The 6-71 uses unit injectors that are mechanically actuated by the camshaft. These injectors control both the amount of fuel delivered and the pressure at which it enters the combustion chamber. Over time, wear in the injector tip, plunger, or spring assembly can lead to reduced performance, higher fuel consumption, or uneven cylinder operation.

Maintaining the injector system on a 6-71 is critical for:

• Consistent Power Delivery – Properly calibrated injectors ensure each cylinder produces equal power.

• Fuel Efficiency – Worn injectors lead to wasted fuel and higher operating costs.

• Reduced Emissions – Clean combustion minimizes smoke and environmental impact.

• Longer Engine Life – Balanced fuel delivery reduces stress on pistons, liners, and bearings.

Rebuilt Injectors for Detroit Diesel 6-71 Non-Turbo (4V)

Each rebuilt injector offered by Diesel Pro Power undergoes a rigorous process: disassembly, ultrasonic cleaning, plunger and barrel inspection, replacement of worn parts, recalibration, and final bench testing. Operators can trust that these injectors will perform to factory standards, ensuring reliability under the harshest conditions.

N55 Injector for Detroit Diesel 6-71 Non-Turbo (4V)

The N55 injector is ideal for applications requiring dependable performance at moderate horsepower. Often selected for steady-load marine engines or industrial generators, the N55 provides balanced fuel delivery, smooth idle, and long service intervals.

N60 Injector for Detroit Diesel 6-71 Non-Turbo (4V)

The N60 is a versatile option that supports slightly higher horsepower while maintaining efficiency. It is commonly chosen by operators running workboats, trawlers, or stationary power units where consistent torque is essential.

N65 Injector for Detroit Diesel 6-71 Non-Turbo (4V)

The N65 strikes a balance between power and economy. Popular in construction equipment, buses, and marine propulsion systems, it allows the 6-71 to achieve dependable mid-range horsepower without compromising on reliability.

N70 Injector for Detroit Diesel 6-71 Non-Turbo (4V)

The N70 is one of the most frequently used injectors in the 6-71 series. It provides increased fuel delivery for applications requiring higher horsepower, such as fishing vessels or larger industrial equipment. When paired with proper governor adjustments, it helps unlock more output while maintaining durability.

N75 Injector for Detroit Diesel 6-71 Non-Turbo (4V)

The N75 injector offers additional fueling capacity for heavy-duty workloads. Operators running dredges, barges, or heavy trucks often select the N75 to meet demanding power requirements without overstressing the engine.

N80 Injector for Detroit Diesel 6-71 Non-Turbo (4V)

The N80 delivers a stronger fueling curve suitable for high-load applications. While it increases horsepower potential, it is best used where cooling and airflow are optimized to handle the additional fuel.

N90 Injector for Detroit Diesel 6-71 Non-Turbo (4V)

The N90 is the most aggressive option in this lineup, delivering maximum fuel for performance-oriented setups. Operators must ensure proper cooling and engine condition when selecting this injector, as it significantly increases output.

Injector Timing Tools for Detroit Diesel 6-71 Non-Turbo

Correct injector timing is as important as injector calibration. Diesel Pro Power offers a complete selection of timing tools designed for Detroit Diesel 71 Series engines. Each tool ensures precise injector rack adjustment and synchronization across all cylinders.

• Injector Timing Tool (1.484) – Commonly used for HV6 engines and compatible with N65 and N80 injectors.

• Injector Timing Tool (1.460) – Suited for HV7 setups and injectors such as N45 through N90.

• Injector Timing Tool (1.508) – A versatile option used for advanced calibration across injector families.

By using the correct timing tool, mechanics can set injectors accurately, improving combustion efficiency and preventing uneven cylinder operation.

Fuel Pipe Connectors, Jumpers, and Lines

To function properly, injectors rely on secure fuel delivery lines. Diesel Pro Power supplies connectors, washers, and jumper lines specifically designed for the Detroit Diesel 71 Series.

• Fuel Pipe Connectors – Secure the injector to the fuel system and prevent leaks under pressure.

• Washers for Fuel Pipe Connectors – Installed in pairs for each injector, ensuring a tight, leak-free seal.

• Fuel Jumper Lines (Short & Long) – Each engine uses a combination of short and long lines to connect injectors in sequence, maintaining uninterrupted fuel flow across the cylinder bank.

Tools and Service Kits

Maintaining 6-71 injectors requires specialized tools and replacement hardware. Diesel Pro Power carries a full range of these essential items:

• Socket Wrench for Injector Fuel Lines – Designed for quick installation and removal without damaging fittings.

• Injector Service Kits – Include replacement seals, washers, and small hardware to refresh injectors during service.

• Injector Brackets and Washers – Secure injectors firmly in place, ensuring stable operation under high pressure.

• Bolts for Injector Brackets & Manifold Flanges – Heavy-duty fasteners that provide long-term reliability.

Injector Tips and Plungers

The injector tip controls atomization, while the plunger regulates fuel delivery pressure. Worn tips or plungers cause misfires, excessive smoke, or fuel dilution. Diesel Pro Power offers new tips and plungers for all injector sizes:

• Injector Tips – Available for N55, N60, N65, N70, N75, N80, and N90 injectors. Each tip is precision-machined for proper spray patterns.

• Injector Plungers – Matched to specific injector models to maintain correct fueling pressure and reliability.

Injector Springs, Valves, and Seats

These small yet vital components determine injector responsiveness and sealing capability.

• Injector Springs – Control plunger return and maintain consistent injection timing.

• Injector Valves & Springs – Prevent fuel leakage and maintain high-pressure sealing.

• Valve Spring Seats – Provide a secure base for injector springs, ensuring long service life.

Governor Components Supporting Fuel Delivery

The governor regulates engine speed and fuel rack movement. Diesel Pro Power supplies essential components for mechanical governors on 6-71 engines:

• Governor Springs – Available in multiple lengths, ensuring proper tension and response.

• Bolts for Governor Booster Springs – Secure the springs under heavy vibration.

• Bearings for Mechanical Governors – Support smooth movement of operating shafts and governor weights.

Additional Fuel System Accessories

To support the full injector system, Diesel Pro Power also stocks:

• Fuel Gauges and Senders – Allow operators to monitor fuel levels accurately.

• Control Tube Brackets & Springs – Maintain alignment and tension of injector racks.

• Hydraulic Governor Cover Gaskets – Ensure leak-free operation of hydraulic-assisted governors.

Why Buy Detroit Diesel 6-71 Non-Turbo Injectors from Diesel Pro Power

40,000+ Satisfied Customers Worldwide

Diesel Pro Power has earned the trust of more than 40,000 operators across 180+ countries. From commercial fleets and shipyards to power plants and industrial facilities, our injectors are relied upon in mission-critical environments where downtime is not an option. When professionals choose Diesel Pro Power, they gain confidence knowing they are working with a proven aftermarket supplier that understands Detroit Diesel engines inside and out.

Fast Global Shipping with Real-Time Tracking

Every order is processed quickly, with most parts shipping out within 24 hours. Operators worldwide benefit from our efficient logistics network and real-time tracking, ensuring that they know exactly when their injectors will arrive. Whether your 6-71 is powering a fishing vessel, a standby generator, or heavy equipment, you can count on Diesel Pro Power to keep downtime to a minimum.

Exclusive Engine-Specific Catalogs

Unlike generic parts suppliers, we provide dedicated catalogs organized by engine model. Our Detroit Diesel 6-71 Non-Turbo injector listings are tailored specifically for the 4-valve head version of this engine. This eliminates the guesswork and confusion that often comes with cross-referencing part numbers or comparing incompatible options. You simply select your injector code—N55, N60, N65, N70, N75, N80, or N90—and order with confidence.

Premium Rebuilt Injectors Tested for Performance

Each injector is carefully disassembled, cleaned, inspected, and rebuilt to precise standards. Components such as plungers, tips, and springs are replaced as needed, and every injector is recalibrated before shipping. This process ensures smooth fuel delivery, efficient combustion, and extended injector life. Operators benefit from injectors that not only restore performance but also help optimize fuel efficiency and reduce smoke output.

Expert Technical Support You Can Rely On

Our support team has decades of experience working with Detroit Diesel engines and is available to assist at every stage—whether you’re selecting the correct injector size, setting timing, or troubleshooting performance issues. We provide detailed guidance to help ensure proper installation, calibration, and long-term reliability. By choosing Diesel Pro Power, you’re not just buying injectors—you’re gaining a partner committed to keeping your 6-71 Non-Turbo running at peak performance.

Choosing the Right Injector for Your Detroit Diesel 6-71 Non-Turbo

The easiest way to identify the correct injector for your engine is to check the circular plate located directly on the injector body. This plate includes a two- to four-digit code such as N55, N65, N70, or N90. Using this identifier ensures you order the correct injector without error.