Mercedes Workshop Manual Om646 Engine Repack Guide
Insert 6mm locating pins through the camshaft gears into the cylinder head housing.
Without this, you will break the plastic intake manifold rails.
Rotate the engine clockwise to Top Dead Center (TDC) on cylinder 1. Verify that the camshaft timing marks align perfectly. Mercedes Workshop Manual Om646 Engine
A genuine Mercedes Workshop Manual (often accessed via the system or a factory DVD) covers these vital areas:
The OM646 underwent various updates, including the "EVO" version introduced in 2006 with a reduced compression ratio and improved turbocharging. Engine Layout : Inline 4-cylinder, DOHC, 16 valves. Displacement : 2148 cc. Power Output : Ranges from 88 hp (65 kW) 170 hp (125 kW) depending on the specific model and tuning. Torque Output : Ranges from Compression Ratio : Standard versions are approximately , while EVO versions are Oil Capacity : Approximately 11.0 liters Insert 6mm locating pins through the camshaft gears
In 2006, the engine was updated (OM646 EVO) with a new turbocharger and ceramic glow plugs for better cold starts. 2. Common Maintenance: What Your Manual Will Highlight
The VNT turbo is vacuum-actuated. The manual includes: Verify that the camshaft timing marks align perfectly
| Specification | Detail | | :--- | :--- | | | 2002 – 2010 | | Displacement | 2.1 L (2148 cc) | | Configuration | Inline-4 | | Cylinder Block | Cast iron | | Cylinder Head | Aluminum alloy | | Valvetrain | DOHC (4 valves per cylinder) | | Compression Ratio | 18.0:1 or 17.5:1 (EVO) | | Fuel System | Common Rail Direct Injection | | Power Output | 88 – 170 HP (65 – 125 kW) | | Torque Output | 162 – 295 lb-ft (220 – 400 Nm) | | Engine Oil Capacity | 6.5 L / 8.5 L depending on oil pan depth |
Unscrew the high-pressure steel fuel line using a 17mm flare nut wrench. Cap the openings immediately. Remove the single Torx T40 injector hold-down stretch bolt.