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Chuffing noise, diesel smell in cabin, black crusty residue around injectors. What the manual dictates: You cannot just pull the injector. The manual specifies using a dedicated puller (e.g., HAZET 2780-4) and a carbon reamer to clean the bore perfectly. It also lists the exact tightening torque for the injector clamp bolts (typically 7 Nm + 90-120°). Failure to follow this leads to repeat failures or cracked cylinder heads.
Full pin-out schematics tracking wiring routes from individual sensors back to the Engine Control Unit (ECU). Critical Torque Specifications
1. Longitudinal Passenger Car Applications (OM646 / OM646 EVO) C-Class (W203, W204), E-Class (W211), CLK (C209). Mercedes Workshop Manual Om646 Engine
This section provides specifications for tearing down and rebuilding the core block.
If replacing the chain, a workshop manual outlines a procedure to crimp a new chain onto the old one and feed it through the sprockets manually, avoiding the need to fully disassemble the front of the engine. 3. Glow Plug Replacement
All values in Nm unless stated.
According to Filo , while the OM646 is reliable, it has known problem areas. Here is how the workshop manual addresses them: 1. Injector "Black Death"
Mercedes C220 204 2008 646811 engine repair with torques - YouTube. This content isn't available. YouTube·Nikolaj Holmegaard
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The OM646 utilizes a duplex timing chain located at the front of the engine. While highly durable, chain stretch can occur over high mileages. Setting Top Dead Center (TDC)
Instructions are provided for cleaning or replacing the EGR valve , which is prone to clogging. D. Timing Chain and Valvetrain
The manual serves as the final authority on service intervals: It also lists the exact tightening torque for