original 20R-1277 Common Rail Diesel Fuel Injector for C3500 3508 3512 3516 3512B 3516B 3516C Engine Marine Construction Machinery Reman Injector original new injector

Engineered for demanding heavy-duty diesel power applications, the 20R-1277 Fuel Injector Assembly delivers precise, high-pressure fuel atomization for large-bore industrial engines. This injector serves as a direct OEM replacement, fully cross-referenced with 10R-1277 and 10R-0957, and is compatible with 3512B, 3512C, 3516B and related V12 platforms operating in generator sets, marine propulsion systems, mining trucks, offshore platforms, and oilfield pump stations worldwide.

Manufactured to strict OEM calibration standards, the assembly features precision-machined nozzle geometry, wear-resistant internal components, and hardened valve seats to ensure superior atomization efficiency and consistent spray patterns across the entire load range. The result is accurate fuel metering, improved combustion, stable power output, lower fuel consumption, and significantly reduced exhaust smoke. Its heavy-duty industrial design supports extended service life under continuous operation, making it well suited for prime power, standby generation, and mission-critical backup systems. Verified applications extend across export markets including the United States, Canada, Mexico, Brazil, Germany, the Netherlands, the United Kingdom, the UAE, Saudi Arabia, South Africa, Australia, Indonesia, Singapore, Malaysia, and Thailand.

For optimal performance, operators should use high-quality diesel fuel, replace filters on schedule, drain water separators, and monitor fuel pressure regularly. During installation, use OEM sealing components, replace copper washers, maintain a clean working environment, and verify fuel pressure after commissioning. Recommended diagnostics include injector bench testing, nozzle inspection, and leak testing to safeguard long-term reliability.