Workshop Manual Om646 Engine Portable: Mercedes

Using correct torque specifications prevents component failure, stripped threads, and fluid leaks. A verified workshop manual highlights these critical torque values for the OM646: Component / Fastener Torque Specification Notes / Additional Angles Stage 1: 60 Nm Stage 2: 90° turn Stage 3: 90° turn Always use new stretch bolts; lubricate threads lightly. Main Crankshaft Bearings Stage 1: 55 Nm Stage 2: 90° turn Replace bolts during a rebuild. Connecting Rod Cap Bolts Stage 1: 30 Nm Stage 2: 90° turn Critical stretch bolts; do not reuse. Camshaft Bearing Caps Tighten evenly from the center outward. Fuel Injector Hold-Down Bolt Stage 1: 7 Nm Stage 2: 90° turn Replace the stretch bolt and copper seal washer every time. Oil Pan Drain Plug Replace the copper crush washer. Flywheel / Flexplate Bolts Stage 1: 45 Nm Stage 2: 90° turn Apply thread-locking compound if specified. 3. Routine Service & Fluid Capacities

Instructions on how to program the individual 5-digit or 7-digit injector classification codes into the Engine Control Unit (ECU) using Star Diagnosis (Xentry) after replacement. Mercedes Workshop Manual Om646 Engine