Mercedes Workshop Manual Om646 Engine [upd] -

Mercedes OM646 — Workshop Guide (concise reference)

Group 09 – Intake & Exhaust

Mastering the Mercedes OM646: Why a Proper Workshop Manual is Non-Negotiable

The Mercedes-Benz OM646 engine is a cornerstone of the German manufacturer’s "four-cylinder diesel dynasty." Produced from 2003 to around 2010, this 2.1-liter (2148cc) common-rail turbodiesel succeeded the legendary OM611 and preceded the OM651. Found in everything from the C-Class (W203/S203) and E-Class (W211) to the Sprinter van and Vito, the OM646 is renowned for its robustness, fuel economy, and long service life.

However, like all precision machinery, it has specific quirks and tolerances. This is where a genuine Mercedes-Benz Workshop Manual (WIS) or a high-quality equivalent becomes your most valuable tool. Guessing or relying on generic advice can turn a simple repair into an expensive catastrophe. Mercedes Workshop Manual Om646 Engine

Group 07 – Injection System (The Holy Grail)

8. Special Tools Required (per Workshop Manual)

| 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 | Mercedes OM646 — Workshop Guide (concise reference) Group

A. Black Sludge / Carbon Buildup in Intake:

Common workshop manual organization

A professional workshop manual for the OM646 typically includes: Swirl flap motor (M55): Removal of the intake