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The Citroën M-series engine was an internal combustion engine developed by Citroën avaliable in both petrol or diesel variants.

Construction
The engine has a five bearing crankshaft in a cast iron block with a camshaft in the engine block driven by a gear on early diesel engines and with a chain on petrol engines. This was later replaced with a belt drive on diesel engines. The petrol variants feature removable wet cylinder liners. The turbocharged diesel and petrol engines have strengthened engine blocks, cylinder heads, crankshafts, pistons and connecting rods to deal with the higher stresses on the turbocharged engines. The cylinder head is made of aluminium and features Ricardo Comet V pre-combustion chambers on the diesel engines. The naturally aspirated petrol engines feature hemispherical combustion chambers and the turbocharged petrol engines have flat crown pistons. The diesel engines use CAV DPA or DPC rotary injection pumps and petrol engines use either Weber carburettors or Bosch L-Jetronic or LE-Jetronic fuel injection. The engine has varying displacements depending on what variant it is with the diesel engines ranging from 2,2 L to 2,5 L and petrol engines from 2,0 L to 2,5 L.