Om422 Engine Workshop Manual May 2026
The OM422 is famous for its internal engine brake (two-stage). The manual includes the valve lash adjustment specifically for the brake pistons. Generic mechanics often adjust this like a standard Cummins or Detroit, ruining the compression release mechanism. The manual details the cold lash settings for both exhaust valves and the brake piston.
The OM422 is part of the OM400 family (OM421, OM422, OM423). The main workshop documentation includes:
| Document Type | Mercedes Part / Number | Notes | |---------------|------------------------|-------| | Engine Workshop Manual | WDB 422 0 01 | Covers repair, disassembly, tolerances, torque specs | | Maintenance Manual | OM 422 / 423 / 441 | Service intervals, oils, filters | | Parts Catalog | A 422 010 00 | Exploded diagrams, part numbers |
These are often bundled with manuals for Unimog 425/435 or MB-Trac 1100/1300 which also use the OM422.
This section covers the basics often overlooked by impulsive mechanics.
Document Control:
Prepared by: Technical Publications Dept.
Validation basis: MB factory service data + field teardown analysis
Next revision due: Upon introduction of electronic injection retrofits (if any)
Would you like a printable one-page quick reference card (torques, clearances, firing order) extracted from this write-up?
You're looking for a workshop manual for the OM422 engine. That's a diesel engine produced by Mercedes-Benz, commonly used in various applications such as trucks, buses, and industrial equipment.
Here's a sample blog post on where to find a workshop manual for the OM422 engine:
Title: Get Your Hands on the OM422 Engine Workshop Manual om422 engine workshop manual
Introduction: Are you a mechanic or a DIY enthusiast looking for a reliable workshop manual to repair and maintain your OM422 engine? Look no further! In this post, we'll guide you on where to find a comprehensive workshop manual for the OM422 engine, helping you get back on the road or keep your equipment running smoothly.
What is the OM422 Engine? The OM422 engine is a diesel engine produced by Mercedes-Benz, known for its durability and performance. It's widely used in various applications, including trucks, buses, and industrial equipment. Understanding the engine's specifications, maintenance requirements, and troubleshooting procedures is crucial to ensure optimal performance and extend its lifespan.
Where to Find the OM422 Engine Workshop Manual: You can find the OM422 engine workshop manual through the following sources:
What to Expect from the OM422 Engine Workshop Manual: The workshop manual should cover the following topics:
Having a comprehensive workshop manual for the OM422 engine will help you diagnose and repair issues efficiently, saving you time and money.
Conclusion: Don't let a faulty OM422 engine hold you back. With the right workshop manual, you'll be equipped to diagnose and repair issues like a pro. Remember to purchase from reputable sources, and happy repairing!
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The Mercedes-Benz OM422 is a heavy-duty, V8 diesel engine from the 400 series, widely used in commercial trucks, buses, and industrial machinery like CLAAS 0;800;0;832; harvesters. 0;16;
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A standard workshop manual for this engine covers service, overhaul, and technical specifications to ensure the engine is repaired to manufacturer standards. 0;16; 0;4f8;0;417; Key Contents:
Technical Data:0;e1f; Detailed specifications including a 128.00 mm bore and 142.00 mm stroke 0;4af;0;30b7;.
Tightening Torques: Essential bolt torque sequences, such as cylinder head bolts (5-step process) and connecting rod bolts (
Major Repair Procedures: Detailed instructions for removing and installing cylinder heads, timing case covers, and replacing shaft seals0;b21;.
Maintenance Schedules: Guidelines for oil and filter changes 0;b9f;, valve clearance adjustments, and cooling system pressure tests.
Troubleshooting: Diagnostic charts for engine noises, starting issues, and lube oil consumption tests 0;5b0;. 0;54; Engine Specifications 0;16; 0;93a;0;79b; Feature 0;407; Naturally Aspirated (OM422) Turbocharged (OM422 A) Configuration V8 Engine, 4-stroke V8 Engine, 4-stroke Displacement ~14.6 Liters ~14.6 Liters Compression Ratio0;431; Typical Power0;253; 202 kW (275 hp) ~243 kW (330 hp) Official & Third-Party Manual Sources 0;16;
You can find these manuals through various technical platforms: 0;16; These are often bundled with manuals for Unimog
Reprinted/Original Manuals: Sites like AgriManuals 0;107f; or Vintage Manuals offer full PDF downloads covering service and overhaul.
Digital Archives: Documents and specification sheets are often available on Scribd 0;7ea; under headings for ADE (Atlantic Diesel Engines) or Mercedes 422 series. 0;2a;
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Comprehensive workshop manuals for the Mercedes-Benz OM422 heavy-duty V8 diesel engine, covering assembly, torque sequences, and overhaul procedures, are available through resources like the Barrington Diesel Club and Vintage Manuals. These resources provide detailed specifications for the engine series, including crankshaft installation and cylinder liner inspection. For the full workshop manual, visit Vintage Manuals.
The Mercedes-Benz OM422 engine is a legendary workhorse. As a member of the renowned OM420 series (often referred to as the "Compact" series), this V10 diesel engine powered some of the most iconic heavy-duty trucks and buses of the 1980s and 1990s, including the Mercedes 1935, 2035, and various O303 and O404 bus chassis.
For mechanics, restorers, and fleet managers, the OM422 Workshop Manual is not just a reference book; it is the definitive authority on keeping these iron giants on the road.
Below is a detailed breakdown of what the OM422 Workshop Manual entails, its critical sections, and why it remains an essential document for vintage Mercedes engineering.
The 422 is susceptible to cylinder liner cavitation. The workshop manual contains the specs for liner protrusion above the block deck. This is critical. If the liner sits too low, the head gasket fails. Too high, it cracks the cylinder head. The manual tells you exactly how to measure this with a dial indicator.