original 222-5972 Diesel Fuel Injector for 3126B 3126E HEUI Excavator Engine Parts Common Rail Injector Nozzle 10R-9239 0R-9350 2225972 Replacement OEM original new injector

Engineered as a direct fitment solution for the 3126 Series diesel platform, this HEUI Diesel Fuel Injector (OE 222-5972) delivers precision fuel metering and reliable atomization for 3126, 3126B, and 3126E engines. Built to hydraulic electronic unit injector standards, it supports controlled diesel quantity delivery into the combustion chamber, stable throttle response, and reduced black smoke through improved spray pattern and combustion efficiency. Cross references include 2225972, 0R-9350, OR9350, 10R-9239, 196-4229, 173-9272, 173-1013, 141-7837, 169-7410, EX639350, and DT0R9350, simplifying stock matching for distributors and fleet buyers.

The injector is suitable for a broad range of heavy-duty environments, including medium duty trucks, excavators, loaders, backhoes, graders, compactors, generator sets, mining machinery, agricultural equipment, and marine auxiliary engines. Its heavy-duty construction targets demanding industrial diesel operating conditions, while HEUI compatibility ensures proper interaction with the high-pressure oil actuation system. Available through OEM, reman, aftermarket, rebuilt, and exchange channels, it supports fleet shops, engine rebuilders, diesel specialists, and parts distributors worldwide.

For best service life, replace fuel and oil filters on schedule, use clean diesel, drain water separators, and renew injector seals during service. Diagnostic support covers rough idle, misfire, black or white smoke, hard starting, low power, and high fuel consumption via cylinder cutout, balance, and fault code testing. Verify part number and engine serial before installation.