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Mercedes Benz OM651 Engine, Produced: 2008-on

Download: OM651 Engine Introduction Into Service Manual

Mercedes Benz OM651 Engine Service
Download: 15.5 mb, 57 pages, .pdf
Models: OM651, DE 18 LA red, DE 18 LA, DE 22 LA red, DE 22 LA
Introduction Into Service Manual

Niigata Engine Maintenance Manual Rpm 1

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Download: OM651 CDI Diesel Direct Injection Manual

Mercedes Benz OM651 Direct Injection
Download: 26.4 mb, 68 pages, .pdf
Models: OM651, CDI Diesel Engine Direct Injection
Direct Injection Technical Data Manual

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OM651 Engine History

The Mercedes-Benz OM651 engine is a family of inline-four cylinder automobile diesel engines introduced by Mercedes-Benz in 2008.

The design goal for the OM651 was to create a common engine design that maximized the parts commonality between the engines manufactured by parent company, Daimler. One requirement of the design was the ability of the engine to be mounted both longitudinally and transversely. Improved fuel efficiency and compliance with Euro 5 emission standards were also design objectives, and by 2010, being updated to the Euro 6 standard; four piezo-electric injectors fed with very high pressure fuel from a common rail inject fuel directly into the combustion chambers to improve combustion compared to previous Mercedes Diesel engines, and recirculated exhaust gas reduces the oxygen in the cylinders to 'starve' any reactions that would produce NO(x).

Although all engines have the same 2.1 L (2,143 cc) swept volume, engines with various power outputs are produced ranging from 109 PS (80 kW) (badged x180) 136 PS (100 kW) (badged x200) 170 PS (125 kW) (badged x220) to 204 PS (150 kW) (badged x250). The 170 PS (125 kW) and 204 PS (150 kW) versions employ a bi-turbo charging setup with a small, high pressure turbo providing quick boost at low RPM and a large, lower pressure turbo providing increased performance at higher RPM. The 100 kW (134 hp) lower output version has only a single turbocharger.

Beginning of summer 2017 the engine, together with OM642 is in discussion that depending if the engine is operated in laboratory emissions testing a different amount of diesel exhaust fluid is used than in real world operating scenarios.

Mercedes OM651 Specifications:

• Production 2008–present
• Configuration Inline 4
• Displacement 1.8 L (1,796 cc)
  • 2.1 L (2,143 cc)
• Cylinder bore 83 mm (3.27 in)
• Piston stroke 83 mm (3.27 in)
  • 99 mm (3.9 in)
• Block material Cast iron
• Head material Aluminum alloy
• Valvetrain DOHC
• Compression ratio 16.2:1

Combustion

• Turbocharger Single turbo / twin-turbo
• Fuel system Common rail
• Fuel type Diesel
• Cooling system Water cooled
• Power output 100–150 kW (134–201 hp)

Chronology

• Predecessor Mercedes-Benz OM646 engine
• Successor Mercedes-Benz OM654 engine

Niigata Engine Maintenance Manual Rpm Chart

OM651 Versions and Applications:

The OM 651 is currently available in car models in ten different performance levels:

OM 651 DE 18 LA red.

OM 651 DE 18 LA

OM 651 DE 22 LA red.

OM 651 DE 22 LA

Mercedes OM651 Engine Service Repair Manual

OM651 Engine Resources