Caterpillar original 4P9077 Diesel Fuel Injector Assembly for 3516 3512 3508 3512A 3500A Engine Excavator Generator 777B 785 789 original new injector

The Caterpillar 4P-9077 fuel injector is engineered specifically for the CAT 3512A and C3512A engines within the 3500 Series V12 turbocharged diesel platform. Designed for direct fuel injection systems, this OEM replacement injector delivers consistent atomization and high-pressure fuel delivery up to 2500 bar, ensuring stable combustion performance across demanding heavy-duty applications including power generation, marine propulsion, mining, oilfield, and construction equipment. It is a direct-fit replacement for Caterpillar 3512A engine applications.

Manufactured to OEM-quality standards, the 4P-9077 features a precision nozzle with a multi-hole spray tip that produces a uniform spray pattern for efficient diesel combustion. The injector body is constructed from high-durability steel alloy and finished with heat-resistant and anti-corrosion coatings, providing long service life under high thermal and mechanical stress. Calibration is performed to match original equipment performance specifications, enabling reliable starting, smooth idle, and consistent power output.

Routine maintenance is recommended every 500 operating hours, including inspection for external fuel leaks, verification of the spray pattern through a diagnostic bench test, and replacement of injector seals and O-rings. Clean fuel filters and the use of recommended diesel fuel are essential to prevent nozzle clogging and premature wear. The 4P-9077 cross-references with 0R-2925, 236-8241, and 10R-7227, allowing flexible interchangeability for service and replacement operations.