Mercedes Workshop Manual Om646 Engine 'link' Jun 2026

Accurate tightening is vital for diesel engines. Technical guides such as the Mercedes-Benz Engine Torque Specifications (hosted on ) provide these common settings for the OM646: Torque Setting Cylinder Head Bolts

The Mercedes-Benz OM646 engine represents a pivotal moment in automotive engineering. As the first four-cylinder diesel engine from Mercedes to utilize twin overhead camshafts (DOHC) and four valves per cylinder, it set new standards for refinement and power density in the early 2000s. Found in popular models like the W211 E-Class, the W203 C-Class, and the Sprinter van, the OM646 is renowned for its durability—provided it is maintained correctly. Mercedes Workshop Manual Om646 Engine

Buy a high-quality PDF from a reputable source like Tradebit or download the Mercedes WIS (Virtual Machine) setup from a trusted torrent (legality varies by country—buy used DVDs legally). Accurate tightening is vital for diesel engines

| Component | Torque (Nm) | Notes | |-----------|-------------|-------| | Cylinder head bolts (M12) | 40 Nm + 90° + 90° | Always replace bolts, use ARP assembly lube | | Main bearing cap bolts | 50 Nm + 90° | | | Connecting rod bolts | 20 Nm + 90° | Replace after each use | | Camshaft bearing caps | 10 Nm | Sequence from center outward | | Crankshaft pulley bolt (center) | 200 Nm + 90° | Use locking tool; do not impact | | Injector clamp bolt | 7 Nm + 90° | Critical; over-torquing cracks injector body | | Glow plug | 15 Nm | Apply anti-seize | | Oil filter housing (to block) | 25 Nm | Replace O-rings | | Timing chain tensioner | 40 Nm | | Found in popular models like the W211 E-Class,