Mercedes Workshop Manual Om646 Engine ((link)) May 2026

OM646

The Mercedes-Benz is a 2.1-liter inline 4-cylinder turbocharged diesel engine widely used in vehicles like the C-Class (W203) , E-Class (W211) , and Sprinter vans. A comprehensive workshop manual for this engine typically spans over 1,000 pages, covering technical specifications, service procedures, and detailed torque settings. 1. Technical Specifications

• Crankshaft position sensor (B70) gap: 0.5mm to 1.5mm.
• Glow plug relay diagnostic (timing vs. voltage).
• Coolant temperature sensor (B11/4) resistance curve.

Service A

Following the manufacturer's service schedule is critical for long-term reliability. Mercedes-Benz typically uses an alternating and Service B system. Service A (Every 10,000 miles / 1 Year) : Engine Oil & Filter : Replace with synthetic motor oil. Mercedes Workshop Manual Om646 Engine

provides an internal perspective on fuel and electrical systems. Specialized Reprints Bucheli Repair Manual OM646 The Mercedes-Benz is a 2

| Fastener | Replacement mandatory? | Notes | |----------|------------------------|-------| | Cylinder head bolts | Yes | Plastic deformation | | Connecting rod bolts | Yes | Stretch bolts | | Main bearing bolts | Yes | Do not reuse | | Crankshaft pulley bolt | Yes | Failure causes engine destruction | | Injector hold-down bolt | Yes | Over-torque cracks injector | | Flywheel bolts | Yes | Auto-transmission applications | Crankshaft position sensor (B70) gap: 0