The Mercedes-Benz OM646 engine is a legend in the world of compact diesel powerplants. Produced from 2003 to 2010, this 2.1-liter, 4-cylinder common-rail diesel engine powered a vast array of vehicles, including the , the E-Class (W211) , the Sprinter (W906) , and the Viano/Vito .
Because this engine relies heavily on electronic control units (ECUs) to manage fuel pressure, turbo boost, and exhaust gas recirculation, the workshop manual differs significantly from older diesel manuals. It requires a blend of mechanical aptitude and electronic diagnostics. Mercedes Workshop Manual Om646 Engine
| Tool Number | Name | Purpose | |-------------|------|---------| | 601 589 02 21 00 | Camshaft locking plate | Timing chain replacement | | 601 589 00 40 00 | Crankshaft TDC pin | Locate TDC | | 611 589 00 63 00 | Injector puller | Remove seized injectors | | 601 589 03 63 00 | Valve spring compressor | Head reconditioning | | 601 589 00 90 00 | Harmonic balancer holder | Crank bolt removal | The Mercedes-Benz OM646 engine is a legend in