With a twin-cam setup, the timing chain installation is far more complex than on a single-cam engine. The manual details the procedure for locking the camshafts using locking pins and ensuring the timing chain tensioners are correctly set to prevent catastrophic engine failure.
For better low-end torque and reduced lag. Mercedes Workshop Manual Om646 Engine
Free PDFs on forums are often incomplete, missing crucial safety steps (e.g., high-pressure fuel system de-pressurization), or are for the wrong OM646 variant (e.g., 646.963 vs 646.811 have different injection systems). With a twin-cam setup, the timing chain installation
Workshop manuals for the OM646 typically cover a vast array of technical procedures: Engine Service & Repair: Detailed instructions for removing/installing the With a twin-cam setup