Engine overhaul / replacement engine Mercedes Benz 300, 320, 350 CDI OM642.820 replacement engine

Engine rebuild / replacement engine Mercedes Benz 300, 320, 350 CDI OM642.820 replacement engine — better than factory new

The Mercedes-Benz OM642.820 is a 3.0-litre V6 common-rail diesel with 224–265 hp, fitted in C-Class, E-Class, M-Class and GL-Class models as well as the Sprinter. MIK Motoren completely overhauls this engine and eliminates typical weak points such as oil pump failure and bearing bore issues for significantly extended service life.

MIK upgrades — why this engine lasts longer

The work carried out includes not only replacing all wear parts, bolts and gaskets, as well as machining the mating and running surfaces, but also replacing components that are marked ex works with weak points and the Limit the engine lifetime.

• upgrade oil pump — The biggest weak point of this engine is its oil pump, which does not deliver enough oil pressure from the factory and repeatedly fails. Without sufficient oil pressure, warning messages, rattling noises and loss of power appear quickly and almost always lead to engine failure. For this reason, we use a specially developed oil pump that increases oil pressure across the entire rev range and protects the engine from wear.
• Alignment of the bearing bore — As mileage increases, the crankshaft bearing seats in the aluminium 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 sporty driver.
• The correct cylinder bore — Over time, different cylinder liners were used. On the one hand, robust gray cast iron sleeves, and on the other hand, more vulnerable plasma or AluSil coatings, which tend to develop scoring after only low mileage and affect the engines' compression. We use exclusively gray cast iron cylinder liners to extend the engine's lifetime.

Scope of overhaul — nothing more is possible

• Upgrade oil pump The biggest weak point of this engine is its oil pump, which does not deliver enough oil pressure from the factory and repeatedly fails. Without sufficient oil pressure, warning messages, rattling noises and loss of power appear quickly and almost always lead to engine failure. For this reason, we use a specially developed oil pump that increases oil pressure across the entire rev range and protects the engine from wear.
• Alignment of the bearing bore As mileage increases, the crankshaft bearing seats in the aluminium 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 sporty driver.
• The right cylinder liner Over time, different cylinder liners were used. On the one hand, robust gray cast iron sleeves, and on the other hand, more vulnerable plasma or AluSil coatings, which tend to develop scoring after only low mileage and affect the engines' compression. We use exclusively gray cast iron cylinder liners to extend the engine's lifetime.
• Main bearings, connecting rod bearings, thrust washers
• Pistons (for full overhaul)
• Piston rings
• Cylinder bores
• Connecting rods
• Crankshaft (for full overhaul)
• Bearing bore (for full overhaul)
• Oil pump
• Timing chain kit (complete)
• Shaft seals
• Cylinder head gasket, bolts
• Sealing surfaces
• Valves, guides, stem seals
• Hydraulic lifters, roller rocker arms
• Camshafts (for full overhaul)
• Cam phasers (for full overhaul)
• Oil spray nozzles
• Stud bolts
• Pulley
• Oil pan
• Timing cover
• Ultrasonic cleaning
• Soda blasting (for full overhaul)
• Grinding & polishing
• Milling the face
• Drilling & honing (for full overhaul)

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 OM642.820 engine

Variants & prices

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

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