Mercedes Benz Classics: Owners Operation, Service, and Repair Workshop Manuals

Mercedes OM421 Diesel Engine Manuals

The Mercedes-Benz OM421 is a 6-cylinder V6 Diesel Engine with a volume of 10,965 ccm which included turbocharged and intercooler versions, which were produced from 1980-


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Download: Mercedes OM421 Engine Service Repair Manual

Mercedes OM421 Diesel Engine Service Repair Manual

  • OM421 Diesel Engines
  • OM421A Turbo Diesel
  • OM421LA Turbo Intercooled
  • Multi Unit Manual: OM421, OM422, OM423, OM424*
    • * Use as Reference for OM424 Engines
  • Download: 29.2mb, 256 pages, .pdf

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Download: Mercedes OM421 Engine Operation and Maintenance

Owner Operation Manual Language: English

Mercedes OM421 Diesel Engine Operation and Manitenance

  • OM421 Diesel Engines
  • OM421 A Turbo Diesel
  • OM421 LA Turbo Intercooled
  • Multi Unit Manual: OM421, OM422, OM423, OM424
  • Download: 44.7mb, 100 pages, .pdf

USD $14.95

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Download: Mercedes OM421 Engine Scheduled Service Booklet

Multi Language: German, English, French, Spanish

Mercedes OM421 Diesel Engine Service Book

  • OM421 Diesel Engines
  • OM421 A Turbo Diesel
  • OM421 LA Turbo Intercooled
  • Multi Unit Manual: OM421, OM422, OM423, OM424
  • Download: 19.2mb, 55 pages, .pdf

USD $9.95

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Mercedes OM421 Technical Data

The OM421 is a four-stroke V-6 cylinder diesel engine manufactured by Mercedes-Benz with a volume of 10,965 cubic centimeters, corresponding to approximately 657 cubic inches. This second generation of V6 diesel engines appeared in 1980 and was equipped with intercooler, and developed a capacity of 190 kW (253 hp). Most of the engines were produced for export. As in the OM 401, the OM421 is the smallest V-engine of second generation 400 series, but also has a turbocharger and intercooler.

Mercedes OM421 Diesel Motor

Engine Mercedes OM 421

The OM421 engine is designed with consideration of environmental norms Euro II. The OM 421 was widely used since the 1990s in road engineering and average tonnage trucks as well as combine harvesters, including combine harvester CLAAS Commandor 115 CS.

Engine Mercedes OM 421 A

The OM421A Four-stroke turbocharged diesel engine offers a volume of 10,965 cubic centimeters (657 cubic inches). Engine OM 421 A was released in 1980 and effectively replaced the predecessor - OM 401 A. Most of the engines were produced for export with consideration of environmental norms Euro II. They were widely used since the 1990s in road engineering and average tonnage trucks. OM 421 A is also used in combine harvesters, including combine harvesters New Holland TF44.

Engine Mercedes OM 421 LA

The OM421LA added a Turbocharger and Intercooler for additional horsepower and torque where needed in applications.

The engine series OM 421, OM 422, OM 423 and OM 424 replaced the earlier 401-404 series of diesel engines with 6 to 12 cylinders in V-arrangement . These second generation motors were release in 1980 and included larger volume and increased horsepower with turbocharged and intercooler features boosting their performance.

Mercedes OM421 Diesel Engine

Variant Specifications

Variant CCM kW HP@RPM Bore/Stroke Comp. Torque @ RPM
OM421 10964 159 216@2300 128/142 16,9:1 785Nm@1200 rpm
OM421A 10964 186 250@2300 128/142 16,9:1  
OM421LA 10964 208 280@2300 128/142 16,9:1  
OM421 Variant Model Engine Codes
OM421.905 10964 159 216@2300 128/142 16,9:1 785Nm@1200 rpm
OM421.906 10964 159 216@2300 128/142 16,9:1 785Nm@1200 rpm
OM421.907 10964 159 216@2300 128/142 16,9:1 785Nm@1200 rpm
OM421.910 10964 159 216@2300 128/142 16,9:1 785Nm@1200 rpm

Mercedes OM421 V6 Diesel Motor Generator

Vehicle Applications

The OM421 was used in many industrial applications including generators

OM421 Applications Output according to DIN 70020 Displacement Specs
Chassis Models Variant KW HP RPM Bore Stroke CCM
615.026/027/028
615.122
615.222
616.024/026/027/028
616.121/122
616.417/419/424/426/
427/428
616.521 /522
617.023/024/026/
028/029
617.121/122/126/127
617.326
617.424/425/426/
427/428
619.017/019
619.036/037/045/047
619.137/138
619.208/209
619.4,17/419
621.005/006/007/008
621.101/102/106/107
621.306/307/327
421.905 159 216 2300 128 142 10964
615.021/064
615.221/224/226/264
616.022/065
619.045
421.906 159 216 2300 128 142 10964
619.045 421.907 159 216 2300 128 142 10964
396.356/358 421.910 159 216 2300 128 142 10964

The entire series is as follows:

Mercedes OM421 A, LA Turbo Diesel Engines