Analysis of Diesel Engine Cylinder Liner Wear for Marine Diesel Engines

The service life of a diesel engine is mainly determined by the wear degree of components such as the cylinder liner, piston, main bearing tube, etc. Accurate measurement and prediction of the wear degree of these components can improve the operational management level of marine diesel engines.

Cylinder liner wear of a diesel engine can be classified into normal wear and abnormal wear. The normal wear rate is relatively low, approximately ranging from (1 to 8)·10^-5 mm/h. The wear rate during abnormal wear may be several times, dozens of times, or even higher than the normal wear rate. The wear amount and the sudden change point of the wear curve are caused by various abnormal wear phenomena.

The wear during the operation of a diesel engine is mainly caused by abrasive wear and corrosion wear. The causes of abnormal wear are numerous, mainly including:

①, the abrasive particle diameter is around 30 um;

②, the sulfur content in the bar fuel is higher than the normal value;

③, the alkalinity of the cylinder oil is too low;

④, the cooling water temperature of the cylinder liner deviates from the set value;

⑤, the exhaust temperature is higher than the normal value;

⑥, the clearance between the piston and the cylinder liner is too large, etc.