original 135-5459 Common Rail Diesel Fuel Injector for 3126 3126B 3126E Engine Fuel Injection Pump Replacement for OEM 1355459 178-6342 Diesel Injector original new injector

Engineered as a direct fit solution for 3126 series diesel engines, the 135-5459 Electronic Unit Injector (EUI) delivers OEM-equivalent performance for heavy-duty applications across transportation, marine, construction, and power generation sectors. This injector assembly is fully interchangeable with cross reference numbers 0R-8479, 10R-0955, 20R-2053, 222-5966, and 235-2888, providing global fleet operators and equipment maintenance teams with a reliable replacement option for 3126, 3126B, and 3126E engines.

Operating on the Electronic Unit Injector principle, the 135-5459 receives fuel supply and electronic control signals from the ECM, generating high injection pressure through a precision plunger and atomizing diesel through calibrated nozzle holes for optimal combustion. Each unit undergoes 100% fuel flow and leakage testing to ensure higher combustion efficiency, improved fuel economy, reduced exhaust emissions, lower particulate generation, and enhanced engine power output. The injector is backed by a 12-month warranty and supports easy installation with worldwide parts availability, making it ideal for Freightliner, Sterling, and Peterbilt trucks, Blue Bird and Thomas Built buses, marine propulsion systems, generator sets, and industrial power units.

For proper service life, always clean injector bores before installation, replace all O-rings and seals, apply manufacturer-approved torque settings, and verify fuel pressure after fitting. Recommended diagnostic procedures include injector balance tests, fuel pressure inspections, Electronic Technician (ET) diagnostics, ECM fault code checks, and electrical circuit verification to maintain peak engine performance.