The OM646 introduced significant advancements in fuel injection. The workshop manual demystifies this complex system:
The Common Rail Diesel Injection system is sensitive. The manual outlines:
Disclaimer: Always follow safety procedures for high-pressure diesel systems. Never work under a vehicle supported only by a jack. This article is for informational purposes; verify all procedures with your specific model year manual.
Operating at up to 1,600 bar for better fuel atomization.