Detroit Diesel 4-71 Turbo Injector Catalog

The Detroit Diesel 4-71 Turbo engine is one of the most iconic two-stroke diesels in the Series 71 family. Known for its reliability, compact design, and ability to handle turbocharging, the 4-71 turbocharged version provides increased horsepower, improved fuel efficiency, and extended durability compared to its naturally aspirated counterpart.

At the heart of this performance is the fuel injection system. The injectors on the Detroit Diesel 4-71 Turbo control combustion by delivering precise amounts of atomized fuel into the cylinder under extreme pressure. Proper injector function is essential for maintaining power, minimizing smoke, and ensuring long service life.

This catalog is designed to give operators, fleet managers, and technicians a complete guide to replacement injectors, timing tools, fuel lines, and supporting hardware for the 4-71 Turbo.

Rebuilt Injectors for Detroit Diesel 4-71 Turbo

All injectors offered here are rebuilt to premium heavy-duty standards. Each unit is disassembled, cleaned, inspected for wear, recalibrated, and tested before being returned to service. This ensures reliable performance equal to or better than the original. Every injector is sold with a refundable core deposit, which supports the rebuilding process and sustainability within the diesel parts industry.

N55 Injector for Detroit Diesel 4-71 Turbo

The N55 injector is ideal for operators who need efficient fuel delivery with moderate output. It supports smooth engine operation under light to medium loads, making it well-suited for auxiliary power units, small marine vessels, and industrial equipment.

N60 Injector for Detroit Diesel 4-71 Turbo

The N60 provides a balance of fuel economy and horsepower. It is one of the most commonly used injectors for the 4-71 turbo because it offers dependable mid-range performance across multiple applications.

N65 Injector for Detroit Diesel 4-71 Turbo

The N65 is a versatile injector option. It allows the turbocharged 4-71 to operate at higher horsepower levels while still maintaining efficient combustion. Commonly chosen for marine propulsion and heavy-duty industrial tasks.

N70 Injector for Detroit Diesel 4-71 Turbo

The N70 injector is engineered for more demanding applications where additional horsepower is required. It ensures quick throttle response and improved torque output, making it popular in larger marine propulsion systems and power generation units.

N75 Injector for Detroit Diesel 4-71 Turbo

With the N75 injector, operators achieve an excellent blend of turbocharged efficiency and higher horsepower. The N75 delivers increased fuel flow, supporting applications that demand consistent power output under heavy load.

N80 Injector for Detroit Diesel 4-71 Turbo

The N80 is chosen for engines requiring significant horsepower gains. It provides strong acceleration and robust performance while still maintaining the durability expected from Detroit Diesel two-stroke engines.

N90 Injector for Detroit Diesel 4-71 Turbo

The N90 is one of the most powerful injectors available for the 4-71 Turbo. It supports maximum horsepower output and is typically used in high-demand marine or industrial environments. Proper timing and calibration are critical when using this injector to avoid excessive smoke or overfueling.

M15 Injector for Detroit Diesel 4-71 Turbo

The M15 is a precision-calibrated injector designed for specialized applications requiring specific fuel delivery profiles. It is often chosen for engines operating under unique load requirements.

M95 Injector for Detroit Diesel 4-71 Turbo

The M95 is another performance injector that supports high-output turbocharged operation. Like the N90, it is intended for applications that prioritize maximum horsepower over economy.

5670 Injector for Detroit Diesel 4-71 Turbo

The 5670 injector provides consistent performance across a wide range of operating conditions. It is rebuilt to heavy-duty standards, ensuring reliability in harsh marine or industrial environments.

7245 Injector for Detroit Diesel 4-71 Turbo

The 7245 is a dependable injector option that balances power and efficiency. It is commonly found in engines used for auxiliary power, tugboats, and commercial equipment.

Injector Timing Tools for Detroit Diesel 4-71 Turbo

Correct injector timing is essential for peak performance. Detroit Diesel engines rely on precise adjustment of injector racks and plungers to maintain efficient combustion. Timing tools ensure that injectors fire at the exact crankshaft position, avoiding rough running, hard starting, or excess smoke.

• Injector Timing Tool (1.484) – Designed for use with select HV6 injectors such as N65 and N80.

• Injector Timing Tool (1.460) – Used with HV7 injectors including N45 through N90.

• Injector Timing Tool (1.508) – A universal calibration tool for fine adjustment across Series 71 injectors.

Each tool is manufactured for durability and accuracy, making them indispensable for mechanics and operators servicing their 4-71 turbocharged engines.

Fuel System Connectors & Lines

The injector system on the Detroit Diesel 4-71 Turbo includes connectors, washers, and fuel lines that deliver diesel fuel to the injectors and return excess fuel back to the system. Over time, these components can wear, leak, or become clogged.

• Fuel Pipe Connectors (Old and New Style) – Ensure secure connections between injectors and fuel lines.

• Fuel Pipe Connector Washers – Used two per injector, preventing leaks at high pressure.

• Short and Long Fuel Lines – The 4-71 turbo uses both types. Short lines connect closely mounted injectors, while long lines bridge greater distances.

Keeping these lines clean and properly sealed ensures uninterrupted fuel flow and reduces downtime caused by fuel system issues.

Tools & Service Kits

Maintaining the Detroit Diesel 4-71 Turbo injector system requires specialized service tools and hardware.

• Socket for Injector Fuel Lines – Designed to install and remove injector fuel lines without damage.

• Injector Service Kit – Provides seals and components needed for injector maintenance.

• Injector Brackets, Washers, and Bolts – Secure injectors in place, preventing vibration and ensuring stability under high pressure.

Replacement Injector Tips & Plungers

Injectors rely on two critical components: the tip (which atomizes fuel into the combustion chamber) and the plunger(which pressurizes fuel before injection). Both must be in top condition for efficient operation.

• Injector Tips – Available for N55 through N90 injectors, ensuring proper spray patterns and combustion.

• Injector Plungers – New plungers restore proper fuel delivery pressure, preventing issues such as misfiring or smoke.

Injector Valve Components

The internal operation of injectors depends on valves and springs that regulate pressure release.

• Injector Valve & Spring Assemblies – Provide consistent pressure release.

• Injector Springs & Spring Seats – Maintain plunger tension and ensure smooth injector operation.

Governor-Related Hardware

The Detroit Diesel 4-71 Turbo often uses mechanical governors to regulate engine speed. Injectors and governors work together to deliver consistent fuel flow.

• Governor Springs (various lengths) – Control engine speed and load response.

• Governor Bolts & Pins – Secure governor components and allow precise adjustments.

• Governor Bearings – Ensure smooth operation of the governor’s moving parts.

• Governor Gaskets – Maintain a sealed system to prevent leaks.

Fuel Gauges & Senders

Monitoring fuel levels is vital in marine and industrial applications.

• Fuel Gauge (12 volts, illuminated) – Compatible with Detroit, Caterpillar, and Cummins diesel engines.

• Fuel Gauge Sender – Adjustable for tank depths up to 19".

Why Buy Detroit Diesel 4-71 Turbo Injectors from Diesel Pro Power

When it comes to maintaining or rebuilding a Detroit Diesel 4-71 Turbo engine, the quality of your injectors is one of the most important factors influencing performance. The injectors control fuel delivery, combustion efficiency, and overall engine reliability. Choosing the right supplier for these components makes the difference between smooth operation and costly downtime. Diesel Pro Power has built its reputation as the go-to source for Detroit Diesel parts by combining quality, speed, and expertise.

40,000+ Satisfied Customers Worldwide

Diesel Pro Power is trusted by more than 40,000 satisfied customers across 180+ countries. From commercial fleets and shipyards to industrial power plants and offshore operators, customers choose Diesel Pro Power because of a proven track record in delivering dependable parts on time. This global trust didn’t happen overnight—it’s the result of decades of consistent service, reliable products, and customer-focused solutions tailored to the needs of Detroit Diesel owners.

Fast Global Shipping

Downtime is expensive, especially in marine and industrial applications where the Detroit Diesel 4-71 Turbo is commonly used. That’s why Diesel Pro Power ships all orders within 24 hours. Customers benefit from real-time tracking and reliable delivery, no matter their location. Whether you’re running a vessel in the Caribbean, operating equipment in South America, or managing a facility in Europe, your parts arrive quickly to get your engine back in service.

Exclusive Engine-Specific Catalogs

One of the most common frustrations operators face when buying injectors is the guesswork involved with part compatibility. Diesel Pro Power solves this problem by offering exclusive engine-specific catalogs. Each listing in the catalog is tailored specifically to the Detroit Diesel 4-71 Turbo, which means customers don’t waste time searching through generic listings or worrying about ordering the wrong component. This precision saves money, reduces downtime, and simplifies the purchasing process.

Premium Rebuilt Injectors

All 4-71 Turbo injectors offered by Diesel Pro Power are rebuilt to strict heavy-duty standards. Each injector is disassembled, inspected for wear, cleaned thoroughly, fitted with new components as needed, recalibrated, and tested under operating conditions. The result is a premium-quality injector that performs like new, ensuring smooth fuel delivery, efficient combustion, and long service life. These rebuilt injectors deliver the performance Detroit Diesel engines are known for—without the cost of brand-new OEM components.

Expert Technical Support

Choosing and installing the correct injector requires technical knowledge, particularly when dealing with variations like N55, N65, or N90 injectors used in different horsepower configurations of the 4-71 Turbo. Diesel Pro Power provides access to experienced support staff who can answer questions on injector timing, calibration procedures, installation tips, and compatibility. This level of support ensures customers not only receive the right part but also install it correctly for optimal performance.