Description

Piston Assembly for the 2.5 four-cylinder naturally aspirated diesel, standard size.

The piston transfers combustion pressure to the connecting rod through the gudgeon pin and carries the ring pack that seals the bore and controls the oil film. Crown and ring-land geometry set the compression height and combustion bowl shape for this engine, so pistons are matched to the block rather than interchanged between diesel variants.

Standard size suits a cylinder bore that is unworn or has been honed within the standard tolerance rather than rebored oversize. Piston protrusion above the deck and ring end gaps should be checked against the engine specification during assembly.