Bosch DLLA154S970 Injector Nozzle Assembly

The Bosch DLLA154S970 is an S-type multi-hole injector nozzle designed for common rail diesel injection systems. It features a 154-degree spray angle optimized for specific combustion chamber geometries in heavy-duty applications. The nozzle body is manufactured from high-speed steel with hardened needle seat surfaces to withstand high injection pressures and cyclic thermal loads. Stamping identification DLLA154S970 corresponds to Bosch part number 0 433 271 791. This component serves as a critical wear part within the injector assembly, requiring precise flow calibration and spray pattern integrity for emissions compliance and engine performance. Cross-reference data confirms compatibility with Renault Trucks and Mack Trucks original equipment applications. The nozzle is supplied as a standalone replacement component for injector repair and overhaul procedures. Installation requires specialized tooling and calibration equipment to ensure correct opening pressure and leakage rates.