Engine overhaul / replacement engine Mercedes Benz 300, 320, 350 CDI OM642.822 replacement engine

Engine Rebuild / Replacement Engine Mercedes Benz 300, 320, 350 CDI OM642.822 Replacement Engine — better than factory-new

The Mercedes-Benz OM642.822 is a 3.0 liter V6 common-rail diesel with 224–265 hp, used in C-, E-, M- and GL-Class models as well as the Sprinter. MIK Motoren fully reworks this engine and eliminates typical weak points such as oil pump failure and main bearing bore issues for a significantly extended service life.

MIK upgrades — why this engine lasts longer

The work carried out includes not only the replacement of all wear parts, screws and seals, as well as machining of the flat and running surfaces, but also the replacement of components that are factory-fitted with weak points and the Limit the engine's lifetime.

• upgrade oil pump — The biggest weak point of this engine is its oil pump, which does not produce enough oil pressure from the factory and repeatedly leads to failures. Without sufficient oil pressure, error messages, rattling noises, and loss of performance quickly become noticeable and almost always lead to engine damage. For this reason, we use a specially developed oil pump that increases oil pressure across the entire RPM range and protects the engine from wear.
• Alignment of the bearing bore — As mileage increases, the crankshaft bearing seats in the aluminum engine block shift, so proper alignment of the bearings can no longer be guaranteed and engine damage occurs. The main bearing bore must always be honed and fixed with the help of hardened shims. Otherwise, another engine failure is inevitable.
• High-quality bearing shells — During the overhaul, all components are precisely measured and machined. The bearing clearance between the individual components is set for lifetime and performance, ensuring especially smooth engine operation. Combined with high-quality bearing shells, this engine is also ideally suited for the performance-oriented driver.
• The correct cylinder bore — Over time, different cylinder liners were used. On the one hand, durable grey cast iron sleeves, and on the other hand more vulnerable plasma or AluSil coatings, which tend to develop scoring after relatively low mileage and affect the engines' compression. We use exclusively grey cast iron cylinder liners to extend the engine's lifetime.

Rebuild scope — nothing more is possible

• Upgrade oil pump The biggest weak point of this engine is its oil pump, which does not produce enough oil pressure from the factory and repeatedly leads to failures. Without sufficient oil pressure, error messages, rattling noises, and loss of performance quickly become noticeable and almost always lead to engine damage. For this reason, we use a specially developed oil pump that increases oil pressure across the entire RPM range and protects the engine from wear.
• Alignment of the bearing bore As mileage increases, the crankshaft bearing seats in the aluminum engine block shift, so proper alignment of the bearings can no longer be guaranteed and engine damage occurs. The main bearing bore must always be honed and fixed with the help of hardened shims. Otherwise, another engine failure is inevitable.
• High-quality bearing shells During the overhaul, all components are precisely measured and machined. The bearing clearance between the individual components is set for lifetime and performance, ensuring especially smooth engine operation. Combined with high-quality bearing shells, this engine is also ideally suited for the performance-oriented driver.
• The right cylinder liner Over time, different cylinder liners were used. On the one hand, durable grey cast iron sleeves, and on the other hand more vulnerable plasma or AluSil coatings, which tend to develop scoring after relatively low mileage and affect the engines' compression. We use exclusively grey cast iron cylinder liners to extend the engine's lifetime.
• Main bearings, connecting rod bearings, thrust washers
• Pistons (for full rebuild)
• Piston rings
• Cylinder bores
• Connecting rods
• Crankshaft (for full rebuild)
• Bearing bore (for full rebuild)
• Oil pump
• Timing chain kit (complete)
• Shaft seals
• Cylinder head gasket, bolts
• Sealing surfaces
• Valves, guides, stem seals
• Hydraulic tappets, roller rocker arms
• Camshafts (for full rebuild)
• Camshaft adjusters (for full rebuild)
• Oil spray nozzles
• Stud bolts
• Pulley
• Oil pan
• Chain cover
• Ultrasonic cleaning
• Soda blasting (for full rebuild)
• Grinding & polishing
• Milling the surface
• Drilling & honing (for full rebuild)

Vehicle compatibility

Mercedes-Benz C-Class (W204), E-Class (W211/W212), GL-Class (X164), M-Class (W164/W166), R-Class (W251), Sprinter — 300 CDI, 320 CDI, 350 CDI with OM642.822 engine

Variants & prices

• Partially rebuilt / No additional service: from €6,713
• Partially rebuilt / Removal & installation: from €11,343
• Partially rebuilt / Vehicle pickup + removal & installation: from €12,501

For the removal & installation service, we need your chassis number (FIN/VIN) to take the exact vehicle configuration into account. Please enter it in the comments field when purchasing.