The reasons for the fracture of the Bitzer 6F piston are roughly as follows:
1. The top of the Bitzer 6F piston has serious carbon deposits. The carbon deposits on the top of the piston make the top of the piston overheat locally and generate high temperature. When the local high temperature exceeds the melting point of the material, the top of the piston will be melted to form a molten hole.

2. Bitzer 6F piston ring glued or broken. The cementation or fracture of the piston ring will cause the piston ring to not be in close contact with the cylinder wall, and the heat of the piston top cannot be transferred away in time.
3. Uneven fuel supply. If the fuel supply amount and fuel supply time of each cylinder of the diesel engine are not uniform, the combustion process of some cylinders will deteriorate, resulting in carbon deposits or severe afterburning. The heat of diesel combustion cannot be used for work, and the temperature of the piston top in some cylinders If it is too high, the material will be thermally fatigued and melted.
4. The injector is not working properly. When oil dripping, secondary injection, and poor atomization occur in the fuel injector, the local temperature of the oil accumulation on the top of the piston is too high, and the thermal stress increases, resulting in ablation.
5. The engine knocks. During the operation of the engine, the top of the piston is subject to the periodic mechanical impact of the combustion explosive force. The instantaneous impact force can reach 7MPa, and the impact force directly acting on the top of the piston can reach more than 100kN. If the engine knocks, its impact will be multiplied. Under the action of thermal stress and periodic combustion explosive force, the piston crown produces thermal fatigue and mechanical fatigue, which eventually leads to melting and cracking. The main reasons for engine knocking are premature fuel supply time or ignition time, excessive carbon deposition in the cylinder, high compression ratio, pre-ignition caused by hot spots on the top of the piston, and low octane number of gasoline used.
6. The oil cooling nozzles are clogged. Some high-power engine blocks are equipped with oil cooling nozzles, which spray oil into the piston cavity to help cool and dissipate heat. If the oil cooling nozzle is blocked, the Bitzer 6F piston will accumulate heat and heat up, which may also cause the piston to burn to the top.
7. The engine runs at overload and overspeed for a long time, or the engine has poor heat dissipation. The piston has been subjected to high thermal stress and mechanical stress for a long time and is prone to fatigue ablation.
8. Bitzer 6F piston is of substandard quality. If there are defects such as pores, porosity, micro-cracks, and slag inclusions in the piston casting, under the action of high temperature and high pressure, these pores, porosity, and micro-cracks will become fatigue sources and cause fatigue damage; the slag inclusions in the Bitzer 6F piston will melt first. Causes the piston to burn.
9. Often banging the throttle, the Bitzer 6F piston engine runs at high speed and heavy load, and the temperature is too high.