Caterpillar original Caterpillar 111-7916 diesel fuel injector replacement for OEM new injector original new injector

The Caterpillar CAT 3126 3126B 3126E Diesel Fuel Injector 111-7916 / 1117916 is an OEM-specification HEUI unit injector engineered for the inline 6-cylinder Caterpillar 3126 platform used across heavy-duty trucks, wheel loaders, excavators, generator sets, marine vessels, and agricultural diesel equipment. As the primary part number 111-7916, this injector is fully cross-referenced with extended authorized numbers including 116-3526, 116-7150, 104-3377, 173-4061, 173-9267, 173-9379, 0R-9348, 0R-9350, 232-1173, 222-5972, 20R-8758, 10R-9239, 188-1320, 4CR0197, and 198-4752, allowing fleet operators and service shops to consolidate inventory across multiple engine arrangements with a single SKU.

Manufactured to meet or exceed OEM rigidity and durability standards, the injector features a precision-machined body and nozzle assembly that delivers consistent atomization, stable injection pressure, and repeatable spray pattern across the full engine RPM range. Heat-treated high-strength internal components are specified for extended service life under continuous high-load operation, while a corrosion-resistant surface treatment protects the assembly from fuel-system moisture, fuel contamination, and harsh under-chassis or marine environments. The unit is fully compatible with HEUI hydraulic actuation and electronically controlled fuel management, ensuring seamless integration with the engine ECM and existing wiring harness.

Before dispatch, each injector is individually tested for leak integrity, spray pattern geometry, and pressure response to verify dynamic performance. For installation, confirm that the original injector number matches 111-7916 or one of the listed cross numbers, verify engine serial number, arrangement number, and ECM configuration, clean the injector bore and fuel line surfaces, replace all seals and O-rings with OEM-grade parts, torque the hold-down to CAT specifications, and complete post-installation idle stability, leak, and diagnostic fault-code checks.