MAN direct injection with bowl-in piston function of the rocker and valves (fine springs enable smooth operation). function of the cut up injection nozzle. function of the bowl-in piston. function of the air-cooled cylinder. description ordernumber 1167 see also: nozzle holder with two-spring injection nozzle and needle-displacement sensor cylinder and cylinder head with tappet control cylinder head with direct petrol injection (GDI) SCR catalytic converter with AdBlue injection