Mercedes Workshop — Manual Om646 Engine

Feature Title: The Mercedes-Benz OM646 Workshop Manual: An Engineering Blueprint for the Modern Diesel

Common retrofit and modification notes

• Performance tuning (ECU remaps) can increase torque and power but stresses the turbo and transmission—use conservative tunes and supporting hardware (upgraded intercooler, reinforced clutch/torque converter).
• Intake and exhaust modifications should respect emissions equipment; removal of DPF/EGR is illegal in many jurisdictions and causes drivability and diagnostic issues.

1. Lock flywheel with tool (602 589 02 21 00).
2. Apply thread locking compound Loctite 2701 to new bolt.
3. Torque to 200 Nm.
4. Angle tighten an additional 90 degrees.
5. Wait 30 minutes before starting engine to allow locking compound to cure.

1. Comprehensive Mechanical Overhaul Data

At the heart of the OM646 manual lies the "Engine Mechanical" section. This is where the manual distinguishes itself from aftermarket literature. It provides: Mercedes Workshop Manual Om646 Engine