Part Number: R5237045 (This is the Detroit Diesel genuine part number).
Common Aftermarket/Cross References: Denso 095000-8081, Bosch 044511-0353. Many remanufacturers will also use this base number.
Engine Application: Primarily designed for the Detroit Diesel Series 60 12.7L engine. It was used in engines from the late 1990s through the 2000s, particularly in models with DDEC III, IV, and V electronic controls.
Function: It is an electronically controlled unit injector (EUI). It combines the fuel pump and injector nozzle into a single unit, activated by the engine's Electronic Control Module (ECM) for precise fuel timing and quantity.
Key Features & Importance
High-Pressure Injection: Generates extremely high fuel pressure internally (upwards of 30,000 psi) for optimal atomization, leading to cleaner combustion and better fuel economy.
DDEC Integration: Each injector communicates directly with the engine's DDEC ECM. The ECM controls the exact timing and duration of fuel injection based on sensor inputs.
Cylinder-Specific Trimming: The ECM can adjust fuel delivery for each individual cylinder (via injector trim codes) to balance performance and minimize exhaust smoke.
1. Structural Characteristics & Technical Advantages
Structural Characteristics:
Unit Injector (EUI) Design: Integrates the high-pressure pump and injection nozzle into a single, camshaft-driven unit mounted directly in the cylinder head.
Cam-Driven Actuation: A rocker arm from the engine's camshaft provides the mechanical force to generate injection pressure.
Solenoid Valve Controlled: An integrated high-speed solenoid valve, commanded by the engine's ECM (DDEC), precisely starts and stops the fuel injection event.
Multi-Orifice Nozzle: Features a micro-machined tip with multiple tiny holes to atomize fuel into a fine mist for efficient combustion.
Technical Advantages:
Extremely High Injection Pressure: Generates pressures over 30,000 psi internally, leading to superior fuel atomization.
Precise Electronic Control: The ECM controls injection timing and duration for each cylinder individually, optimizing power, efficiency, and emissions.
Cylinder Balancing: Via injector trim code programming, the ECM can fine-tune fuel delivery per cylinder, ensuring smooth operation and maximizing engine life.
2. Main Application Scenarios & Equipment
This injector is used in on-highway, heavy-duty diesel applications:
Class 8 Trucks: Freightliner (Century Class, Columbia, Coronado), Western Star, Kenworth, Peterbilt, International, Mack, and Volvo trucks equipped with the Series 60 12.7L engine.
Primary Role: Long-haul freight linehaul, regional distribution, and heavy cargo transport.
Occasional Use: In some stationary generator and marine propulsion units repurposing the Series 60 engine.
3. OEM Cross-Reference Numbers
The primary OEM cross-reference numbers for the R5237045 are:
Denso: 095000-8081
Bosch: 044511-0353
These are direct OE-equivalent part numbers from the major manufacturers who supplied this injector design. Most quality remanufactured injectors will also be based on these core numbers.
4. Daily & Periodic Maintenance Suggestions
Daily/Operational:
Use High-Quality Fuel: Purchase diesel from reputable, high-turnover stations to minimize water and contaminant ingress.
Operate with Adequate Fuel: Avoid running the tanks extremely low, which can pull sediment from the bottom into the fuel system.
Monitor Performance: Pay attention to changes in idle quality, power, smoke, and fuel economy—early signs of potential injector issues.
Periodic/Preventive:
Regular Fuel Filter Changes: Replace primary and secondary fuel filters strictly per the manufacturer's interval (often 15,000-30,000 miles). This is the single most important maintenance task for injector longevity.
Use a Fuel Additive (Consider): A reputable diesel fuel additive with detergents and lubricity enhancers can help keep injectors clean, especially with lower lubricity ULSD fuel.
Address Problems Immediately: If a misfire or performance issue arises, diagnose it promptly. A single failing injector can overload others and wash down cylinder walls, causing broader damage.
Professional Cleaning/Testing: At major engine overhauls (e.g., 500,000+ miles), consider having all injectors professionally bench-tested and cleaned by a certified fuel injection shop.
Fuel Injector Supplier：
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