1. The cylinder cushion bolts loosening, tightening force uneven or tightening method is not correct.
2. The cylinder head warping deformation and the cylinder body irregularity is big and so on.
3. Cylinder cushion used for a long time, the lack of flexibility, the use of the cylinder cushion quality is poor, assembly unreasonable.
4. The fuel injection is too early;
5. Improper use of diesel engine. such as regular empty load rapid acceleration, high temperature frequent flameout.
6. Diesel engine maintenance, assembly quality is poor.