The R5235915 is a specific, factory-calibrated fuel injector (also called a fuel injector assembly or fuel injector cup) used in various Detroit Diesel Series 60 engines. It is a critical component for precise fuel delivery, which directly impacts engine performance, fuel economy, and emissions.
Key Specifications & Details
Manufacturer Part Number: R5235915 (This is the original Detroit Diesel/DDC number).
Common Cross-Reference/Aftermarket Number: P5000-6150 (A very well-known aftermarket equivalent from manufacturers like Genuine Diesel, Bosch, or American Bosch).
Application: Detroit Diesel Series 60 Engines (primarily 11.1L and 12.7L versions). Always verify against your engine's specific model and serial number (S/N).
Type: Electronic Unit Injector (EUI). The Series 60 uses a mechanically actuated, electronically controlled unit injector system.
Calibration Code: Each injector has a specific calibration code (a series of letters/numbers stamped on it). For optimal performance, it is highly recommended that all injectors (cylinders 1-6) are matched to the same calibration code. Using mismatched codes can cause rough running and derates.
1. Structural Characteristics & Technical Advantages
Structural Characteristics:
Type: Mechanically Actuated, Electronically Controlled Unit Injector (EUI). It combines the injection pump and nozzle into a single unit per cylinder.
Key Internal Components:
Solenoid Valve: Electronically controlled by the ECM to precisely time the start and end of injection.
Helical Plunger & Barrel: A camshaft-driven plunger creates extremely high injection pressure (upwards of 30,000 psi). The helical design on the plunger allows for variable fuel quantity and timing based on its rotational position.
Check Valve & Nozzle: Opens at high pressure to atomize fuel directly into the combustion chamber.
Design: Compact, self-contained unit installed directly into the cylinder head.
Technical Advantages:
High Injection Pressure: Enables superior fuel atomization for cleaner, more efficient combustion.
Precision Electronic Control: The ECM can adjust timing and duration for each injection event, optimizing power, fuel economy, and emissions.
Integrated Design: Eliminates high-pressure fuel lines, reducing potential leak points and pressure losses.
Proven Durability: The Series 60 EUI system is renowned for its robust construction and long service life when maintained properly.
2. Main Application Scenarios & Equipment
This injector is used almost exclusively in the Detroit Diesel Series 60 engine, one of the most successful heavy-duty diesel engines in history.
Primary Applications:
Class 8 Trucks: Long-haul, on-highway tractors (e.g., Freightliner, Western Star, Kenworth, Peterbilt models equipped with Series 60).
Vocational & Heavy Equipment: Dump trucks, refuse haulers, fire trucks, and stationary power units.
Coaches & Buses: Intercity and charter motorcoaches.
Equipment (Engine Models):
Series 60 11.1L and 12.7L engines (1990s through early 2000s, prior to the EGR-era engines).
Crucial Note: Always match the injector to the engine's exact model and serial number, as calibrations changed over the production run.
3. OEM Cross-Reference Numbers
The R5235915 is the original Detroit Diesel (DDC) part number. The most critical and direct cross-reference is:
P5000-6150 - This is the universal aftermarket/OEM-equivalent part number used by major manufacturers like Genuine Diesel (GDI), Bosch, American Bosch, and SMPE.
Other potential OEM-style numbers you may encounter (all typically referencing the same part) include:
Purchasing Tip: When ordering, providing both R5235915 and P5000-6150 ensures you get the correct part.
4. Daily Maintenance Suggestions
Proactive maintenance is key to maximizing injector life (often 500,000+ miles).
Use Ultra-Low Sulfur Diesel (ULSD): Mandatory for proper lubrication of the injector's tight tolerances.
Regular Fuel Filter Changes: Change primary and secondary fuel filters strictly per the OEM schedule (typically every 15,000-30,000 miles). This is the SINGLE most important maintenance task. Use high-quality, water-separating filters.
Drain Water Separators: Drain the water from the fuel filter/separator bowl daily or as indicated by the warning light.
Avoid Fuel Contamination: Never let the tanks run completely dry. Only fuel up at reputable, high-volume stations. Consider using a biodiesel-compatible fuel additive for lubricity and cleanliness if recommended.
Operate the Engine Correctly: Allow the engine to reach normal operating temperature under moderate load to prevent fuel wash-down and carbon buildup on injector tips.
Monitor Performance: Pay attention to symptoms like hard starting, smoke, loss of power, or increased fuel consumption. Address issues promptly to prevent damage.
Fuel Injector Supplier:
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