Caterpillar 3500 Series Reman Injector 0R-1759 | OEM Fuel Injector Assembly

 

This Caterpillar 3500 Series Reman Injector (0R-1759) is a factory-remanufactured fuel injector assembly engineered for the 3508, 3512, and 3516 diesel platforms. Built to original Caterpillar specifications and fully tested, this reman injector restores precise fuel delivery and combustion efficiency at a fraction of new-unit cost.

 

 

The 0R-1759 reman injector operates with an opening pressure of approximately 19.5 MPa and a working pressure of 190 MPa, delivering a metered injection quantity of roughly 185 mm³ per cycle. The nozzle features eight spray orifices at 0.22 mm diameter, producing a 15-degree spray cone angle for optimized atomization. Each unit undergoes flow testing, leak-down verification, and spray pattern inspection prior to dispatch, ensuring cylinder-to-cylinder consistency within ±2% flow deviation.

 

 

This remanufactured injector supports a broad range of Caterpillar 3500 series power plants, including the 3508, 3512, and 3516 engine configurations deployed in marine propulsion, standby power generation, mining haul trucks, and locomotive applications. It serves as a direct replacement for several legacy part numbers, including 6I-4357, 7C-9576, 7C-9578, and 7W2269, making it a practical stocking item for fleet maintenance programs and diesel parts distributors supporting mixed-age equipment inventories.

Attribute	Specification
Part Number	0R-1759
Injector Type	Remanufactured Unit Injector (EUI)
Cross-Reference Numbers	6I-4357, 7C-9576, 7C-9577, 7W2269
Opening Pressure	19.5 MPa
Working Pressure	190 MPa
Nozzle Orifice Count	8
Spray Cone Angle	15°
Flow Tolerance	±2%
Net Weight	~2.85 kg

 

Installing the 0R-1759 requires strict attention to sleeve cleanliness and sealing surface preparation within the cylinder head injector bore. The injector retaining bolt should be tightened to 18–22 N·m in a cross-pattern sequence, and the copper washer must be replaced-never reused. Prior to final torque, technicians should verify that the injector solenoid connector seats fully and that return flow at idle remains within acceptable limits. Fuel system flushing and high-pressure line replacement are strongly advised when contamination history exists, as residual debris can compromise the new injector within short operating hours.

 

 

For diesel injection workshops and parts wholesalers, the Caterpillar 0R-1759 reman injector offers a compelling balance of OEM-level reliability and inventory economics. Unlike low-cost aftermarket alternatives, remanufactured units undergo core rehabilitation, nozzle replacement, and calibration matching Caterpillar specifications, delivering 8,000–10,000 hours of projected service life under normal operating conditions. This translates to reduced comeback rates, predictable warranty exposure, and a credible alternative to new OEM injectors that often carry lead times and premium pricing.

 

 

Q1: Can I mix 0R-1759 reman units with new injectors in the same engine?
A: Mixing is technically permissible, but flow matching across all cylinders is strongly recommended for optimal balance. Reman and new units should be flow-tested as a set before installation.

Q2: What warranty coverage accompanies these reman injectors for wholesale buyers?
A: Standard coverage runs 12 months from invoice date. Volume distributors can negotiate extended terms and core return credit structures with most reman suppliers.

Q3: How should I handle core returns to maximize credit value?
A: Cores must be complete, unmodified, and free of excessive rust or impact damage. Missing components or cracked bodies typically reduce or void core credit eligibility.

Q4: What symptoms indicate the 0R-1759 needs replacement?
A: Rough idle, black smoke, fuel dilution in engine oil, misfire codes, and measurable power loss are common indicators of injector degradation requiring bench testing or replacement.

Q5: Are these injectors suitable for Tier 2 or Tier 3 marine upgrade projects?
A: Yes, 0R-1759 reman units are compatible with Caterpillar marine EUI-to-Tier 3 upgrade kits, though ECM calibration and software updates may be required depending on the specific kit configuration.

 

 

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