09-10-2014, 03:37 PM
Abstracts: First we will study about valve failure in diesel engine, in this we will also study the major affecting factor causes valve failure. Then we change some design data of valve and then we modify specification of valve. Finally we will reduced valve failure. The exhaust valves of a diesel engine are exposed to thermal and mechanical overstress which may be sources of valve failures. The exhaust valves usually fail as a result of different failure modes such as wearing, fatigue and corrosion. In order to describe these modes a failed exhaust valve which was belonged to a heavy-dutydiesel engine is investigated. The investigation of the failure was carried out by using several experimental tests. it was found that the carbon content of the material of the failed valve decreased.. Fuel-burn vanadium and chromium carbide were detected on the surface of the valve. It was concluded that the valve was broken down before its expected service life. Then we will put some design specification of valve and modification.