Engine Volvo D12A420

Engine Volvo D12A420

The Volvo D12A420 engine is a 12-liter in-line 6-cylinder turbo diesel common-rail engine. Fits on FH12 and FM12. Diesel engines D12A420 are a further continuation of the successful and well-proven 4-valve technology in terms of specific pressure and injection power parameters. This model uses an electronic control system for the engine operation, which allows you to optimize the actions of the fuel system.

The Volvo D12A units are turbocharged to increase power. The redesigned heat exchanger, combined with a completely new injection system as well as the EMC-2 engine management system, has increased the performance and control of the engines to a level suitable for the most demanding operating conditions. Volvo D12A420 engines operate with six cylinders arranged in a single row to facilitate repair and service work.


Engine’s type diesel
Power output, kW at rpm 309 at 1700
Power output, hp at rpm 420 at 1700
Displacement, cc 12100
Number of cylinders 6
Valves 24
Torque output, Nm / rpm 1100 at 1300
Compression ratio (compression) 17.5:1
Cylinder bore, mm 131
Piston stroke, mm 150
Configuration inline
Fuel type diesel
Fuel system direct injection
Turbine turbo / charge air cooler
Euro standards Euro 2
Cylinder head SOHC/OHC
Timing mechanism spur gear
Timing rocker arm
Cooling water

Such motors have a number of advantages and characteristic features:

  • the cylinder block and cylinder head are made of ductile iron;
  • cylinder liners are easy to replace;
  • 4-valve overhead camshaft technology;
  • integrated oil cooler in the cylinder block;
  • double filtration of engine oil using Spin-on technology;
  • electronic injector unit;
  • the air filter is equipped with replaceable inserts.

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