Caterpillar original fuel injector for 3516B C12 3500 3508B 789C 793D 10R1285 361-9355 250-1313 10R-1285 329-0213 replacement original new injector

Engineered as a direct-fit replacement for the CAT 3512B platform, the 20R-0850 fuel injector delivers consistent injection pressure and accurate fuel metering for demanding industrial operations. Built with precision-machined components and anti-wear coatings, the unit withstands the high thermal and mechanical loads typical of 3500 series engines. Its hardened alloy nozzle ensures fine fuel atomization, promoting stable combustion and efficient power output across generator sets, marine propulsion systems, and heavy equipment installations.

The 20R-0850 operates as an electronic unit injector, providing precise electronic control of injection timing and volume. This contributes to lower exhaust emissions, improved fuel economy, and reliable cold-start performance. Compatible with cross-references 1476229, 1504454, 2290191, 2501313, 3602392, and 3619355, the injector offers broad interchangeability across 3512B, 3516B, 3508B, 3512C, and 3520 engine configurations. Each unit is manufactured to meet strict dimensional and performance tolerances, ensuring a drop-in installation experience.

Routine maintenance maximizes service life. Operators should replace fuel filters at recommended intervals, use clean high-grade diesel, and inspect injector bore condition before installation. Always install new OEM seals, apply proper torque settings, and conduct post-installation testing to verify injection timing and engine performance. Symptoms such as black smoke, white smoke, or power loss may indicate worn nozzles, timing irregularities, or leaking seals, signaling the need for injector replacement to restore full engine efficiency.