Perkins original Perkins 198-6605 Fuel Injector Nozzle 10R-9348 222-5965 for Perkins Spares C7 C9 3126E Engine new injector original new injector

The Perkins 198-6605 1986605 HEUI injector is engineered as a direct replacement for the Perkins 3126 series diesel engines, including 3126, 3126B, 3126E, and selected C7-related applications. This Hydraulic Electronic Unit Injector operates under the HEUI fuel injection system, using high-pressure engine oil for actuation and ECM electronic control to deliver precise fuel atomization for each of the six cylinders. The heavy-duty construction supports reliable cylinder balance, consistent injection pressure, and stable performance across demanding operating conditions.

This injector is cross-referenced with multiple authorized OE numbers, including 10R-0781 / 10R0781, 197-7107 / 1977107, 199-6065 / 1996065, 222-5926 / 2225926, and EX630781, along with supplementary references 222-5966, CA1986605, and CAT1986605. It is designed for use in truck engines, marine engines, industrial engines, construction machinery, excavators, generators, medium-duty trucks, bus and coach engines, and off-highway equipment, serving both fleet maintenance operations and engine rebuild shop requirements.

For dependable service life, clean diesel fuel and scheduled fuel filter replacement are recommended, and the water separator should be drained regularly to prevent corrosion. The correct engine oil grade must be used, as HEUI actuation depends on consistent high-pressure oil supply, with the oil filter replaced on schedule. Routine inspection of the injector wiring harness, connectors, and air filter helps maintain combustion quality, while fuel pressure, oil pressure, and injection actuation pressure should be checked whenever hard starting, rough idle, low power, or misfire occurs. Replacement injectors should remain in sealed packaging in a clean, dry environment until installation.