Abstract
This paper presents a systematic study regarding the durability of exhaust valve of diesel engines burning heavy fuel oil. This study has been conducted with the aim of clarifying the mechanism of blow-by in order to estimate the temperature of exhaust valve seat in operating engines. It is necessary to treat the relationship between the corrosion of the exhaust valve seats in onboard operating conditions and surface temperature of the valve seats. It has been confirmed that although the temperature of the normal exhaust valve seats is low for hot corrosion during engine operation, the seating surface temperature in the onboard operating conditions exceeds the critical temperature for hot corrosion by taking into consideration the temperature rise caused by the high temperature and high-pressure combustion gas blowing at a high velocity through local gaps of the valve seats.
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