Launched in 1979, the OM422 was initially derived from the earlier OM402 engine found in models like the 1626S. By increasing the cylinder bore from 125 mm to 128 mm and the stroke from 130 mm to 142 mm, Mercedes created a robust 14.6-liter workhorse. The naturally aspirated OM422 was groundbreaking, shifting its torque peak down to just 1,200 rpm, giving drivers incredible flexibility without needing to constantly downshift on inclines.

Routine maintenance prevents premature component failure and ensures compliance with emission standards. Lubrication System

: The manual is essential for providing exact bolt torque specs and valve clearances , which are vital for maintaining compression and fuel efficiency in the OM422.

This manual provides comprehensive service, maintenance, and overhaul procedures for the Mercedes-Benz OM422 V8 diesel engine. The OM422 is a direct-injection, 90° V8, 14.6-liter (890 cid) naturally aspirated or turbocharged engine, designed for high torque at low RPM and extended service life in commercial vehicles.

This comprehensive workshop guide provides the critical data and step-by-step procedures necessary to overhaul, service, and troubleshoot the OM422 engine family, including the naturally aspirated, turbocharged (A), and intercooled (LA) variants. 1. Engine Specifications & Identifiers

Refer to the specific manual supplement (typically around 0.40 mm).

24.5 mm above the spring seat pocket 4. Tightening Torques & Bolt Sequences

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This comprehensive workshop manual provides the critical technical specifications, maintenance procedures, and troubleshooting steps required to service, repair, or overhaul the OM422 engine. 1. Engine Identification and Technical Specifications