Procedures for disassembling oil pumps, testing coolant regulators, and flushing the cooling system. Recommended Maintenance Schedule
Rotate the engine to the specified static injection timing point (typically 15° to 18° Before Top Dead Center, depending on the specific engine variant model code). om422 engine workshop manual
: Instructions for measuring protrusion and installing replacement wet liners. The Mercedes-Benz OM422 engine is more than just
The Mercedes-Benz OM422 engine is more than just a piece of machinery; it is a legendary V8 powerhouse that defined a generation of heavy-duty transport. Its "story" is one of engineering transition, taking Mercedes-Benz from mechanical simplicity to the dawn of high-tech efficiency in the 1980s. The Legend of the "Million-Kilometer" Engine The OM422 belongs to the celebrated 400 series Power | ~202 kW (275 hp) @ 2300
| Specification | OM422 (Naturally Aspirated) | OM422A (Turbocharged) | OM422LA (Turbo Intercooled) | | :--- | :--- | :--- | :--- | | | 4-stroke V8 diesel | 4-stroke V8 diesel | 4-stroke V8 diesel | | Displacement | 14.6 L (14,618 cc / 875 cu in) | 14.6 L (14,618 cc / 875 cu in) | 14.6 L (14,618 cc / 875 cu in) | | Bore x Stroke | 128.0 mm x 142.0 mm (5.04 in x 5.59 in) | 128.0 mm x 142.0 mm (5.04 in x 5.59 in) | 128.0 mm x 142.0 mm (5.04 in x 5.59 in) | | Compression Ratio | 16.9:1 | 16.25:1 | 16.25:1 | | Max. Power | ~202 kW (275 hp) @ 2300 rpm | ~243 kW (326 hp) @ 2300 rpm | ~250 kW (335 hp) @ 2300 rpm | | Max. Torque | ~1022 Nm (754 lb·ft) @ 1200 rpm | ~1402 Nm (1034 lb·ft) @ 1200 rpm | ~1500 Nm (1106 lb·ft) @ 1200 rpm | | Oil Capacity (Dry Fill) | 17.5 - 24.0 Liters | 17.5 - 24.0 Liters | 17.5 - 24.0 Liters | | Cooling System | Water-Cooled | Water-Cooled | Water-Cooled | | Injection System | Direct Injection (Bosch PES inline pump) | Direct Injection (Bosch PES inline pump) | Direct Injection (Bosch PES inline pump) |
The OM422 utilizes a mechanical Bosch inline injection pump (PE series) driven directly by the engine gear train. Correct spill timing is paramount to prevent black smoke, hard starting, and high exhaust gas temperatures (EGTs). Injection Timing Procedure