Om422 Engine Workshop Manual _hot_

| Tool Number | Description | Use | | --- | --- | --- | | 601 589 01 33 00 | Valve spring compressor | Overhead valve disassembly | | 617 589 01 21 00 | Injection pump gear puller | Remove pump without timing disturbance | | 603 589 00 33 00 | Pre-chamber extractor | Threaded puller for pre-combustion chambers | | 614 589 00 10 00 | Dial gauge holder for cam lift | Measure cam lobe wear |

– 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. om422 engine workshop manual

For mechanics, restorers, and fleet managers, the is not just a reference book; it is the definitive authority on keeping these iron giants on the road. | Tool Number | Description | Use |