Approximately 202 kW (275 hp) @ 2300 rpm for the base OM422. Barrington Diesel Club Manual Contents & Repair Procedures
: Exhaustive technical data on exact torque settings for every major bolt, including cylinder head and flywheel bolts, to ensure manufacturer-standard reassembly.
What is the of your engine (e.g., Mercedes truck, marine vessel, or industrial generator)? om422 engine workshop manual
This guide provides a deep dive into the OM422 series, covering technical specifications, maintenance procedures, and the critical information you will find in a professional workshop manual. Overview of the Mercedes-Benz OM422 Engine
Rotate the crankshaft to the designated Before Top Dead Center () mark on the vibration damper scale (typically 13° to 18° BTDC depending on the specific OM422 variant model plate). Ensure cylinder number one is on its compression stroke. Approximately 202 kW (275 hp) @ 2300 rpm for the base OM422
The Mercedes-Benz is a legendary V8 diesel engine, renowned for its robustness, reliability, and high torque output, particularly within the heavy-duty trucking and industrial machinery sectors . Whether it is powering a Mercedes-Benz Actros, a heavy crane, or a marine generator, the OM422 requires meticulous maintenance to ensure longevity.
Given the age of this engine (late 80s to early 90s), Mercedes-Benz dealerships have largely purged these paper manuals. You have three viable options today: This guide provides a deep dive into the
Mercedes-Benz OM422 Engine Workshop Manual: A Comprehensive Guide
– The manual requires a compression test followed by a leak-down test. It provides the exact leakage allowance percentage. Step 2: Injection Lines (Section 14) – Before touching the head, the manual dictates the specific bending sequence of the high-pressure fuel lines. Bending them arbitrarily causes fuel spray pattern failure. Step 3: Valve Train (Section 09) – The manual provides the pre-load for the rocker arm shaft. The OM422 uses a hollow shaft that supplies oil to the engine brake. If you overtighten the end plug (as per gut feeling), you starve the brake of oil. Step 4: Head Bolts (Section 01) – You follow the manual’s 5-stage torque sequence. You note that the manual specifies always using assembly grease, never dry oil, for the threads. Step 5: After-run checks (Section 17) – After assembly, the manual has a checklist for valve overlap adjustment using the flywheel degree markings.
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