MERCEDES BENZ 651955 NAKED ENGINE
€3200.00
The 651955 engine is a diesel engine produced by Mercedes-Benz. It belongs to the OM651 family of engines, which have been used in various Mercedes-Benz models:
Mercedes A-Class W176 (2012–2018)
Mercedes B-Class W246 (2011–2018)
Mercedes C-Class W204 (2008–2015) and W205 (2014–2018)
Mercedes CLA-Class C117 (2013–2018)
Mercedes CLS-Class C218 (2011–2018)
Mercedes E-Class W212 (2009–2016)
Mercedes GLA-Class X156 (2013–2019)
Mercedes GLC-Class X253 (2015–2019)
Mercedes GLK-Class X204 (2009–2015)
Mercedes M-Class W166 (2011–2018)
Mercedes S-Class W221 (2011–2013) and W222 (2014–2017)
Mercedes SLK-Class R172 (2012–2017)
Mercedes Sprinter W906 (2009–2018) and W907 (from 2018 onwards)
Mercedes V-Class W639 (2010–2014) and W447 (2014–2019)
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The Mercedes-Benz OM651 is a family of in-line four-cylinder diesel engines introduced by Mercedes-Benz in October 2008. Designed as a replacement for the OM646 and OM642 series, these engines were manufactured at the Mercedes-Benz plant in Stuttgart, Germany.
Engine Design and Features
In 2008, Mercedes-Benz launched a new generation of 4-cylinder diesel engines featuring a cast-iron cylinder block and an aluminum 16-valve cylinder head with hydraulic lifters. The engine also utilizes a combined timing drive, incorporating a roller chain, several gears, and balancer shafts.
Turbocharging Options: Basic versions of the OM651 engine are equipped with an IHI VV20 or IHI VV21 variable geometry turbocharger. The more powerful variants come with a BorgWarner R2S bi-turbo system.
Fuel Injection System: Initially, the more powerful versions were fitted with a Delphi fuel system with piezo injectors, which proved to be problematic. Starting in 2010, these were gradually replaced with electromagnetic injectors. Additionally, from 2011 onwards, Mercedes initiated a recall campaign to replace the injectors in previously produced units. Basic engine variants feature a Bosch fuel system with electromagnetic injectors.
Engine Variants
The OM651 engines are available in two main versions:
DE18 LA: 1796 cc
DE22 LA: 2143 cc
Despite most variants having a displacement of 2143 cc, the power output ranges from 107 hp to 204 hp. Engines producing more than 170 hp (125 kW) are equipped with a twin-turbo system, while those with less than 100 kW use a single turbocharger.
Notable Features
Compact Design: The engine's compact and low-profile design, facilitated by a rear camshaft drive, helps meet legal requirements for pedestrian protection.
Advanced Fuel Injection: The 4th generation common rail direct injection system features piezo injectors, capable of delivering an injection pressure of up to 2000 bar. These were later replaced with conventional injectors due to reliability issues. The precise control of the injector needle allows for flexible injection timing, smooth engine operation, high performance, low fuel consumption, and reduced exhaust emissions.
Optimized Combustion Chamber: The flat combustion chamber geometry and lower compression pressure reduce raw exhaust emissions, especially nitrogen oxides. The engine can handle a maximum cycle pressure of up to 200 bar, enhancing performance while minimizing harmful emissions.
Two-Stage Turbocharging: The compact two-stage boost module, excluding the GLK model, includes a small high-pressure turbocharger and a larger low-pressure turbocharger. This system regulates the air supply according to demand, optimizing cylinder filling and delivering higher torque at low engine speeds.