The piston forms the moving bottom wall of the combustion chamber. Its specially designed shape contributes to ensuring optimum combustion. The piston rings seal off the gap to the cylinder wall so as to ensure high compression and as little gas as possible enters the crankcase.
The following features apply both to the M57 and M67:
• Cooling duct piston with rotationally symmetrical piston crown bowl specific to DI common rail
• The lobe in the piston crown bowl is higher than on the M47
M67-specific features
• The pistons of cylinder bank 1 (1 – 4) and cylinder bank 2 (5 – 8) differ as the valve arrangement is not symmetrical
(different valve pockets on piston); the pistons are identified accordingly
