Cause Analysis of Diesel Engine Piston Burning

Diesel engine in the process of using the top burning is a common phenomenon, this article will mainly from the following aspects of diesel piston burning top reasons, I hope users to strengthen the maintenance of the use of diesel engines, the diesel engine has been maintained in good condition. Diesel piston burning top of the main reasons:

    1. Diesel piston severe wear or fracture oil on the channeling, resulting in piston burning top. 3. Select a low-grade lubricants, accelerated diesel cylinder wear, crankcase exhaust pressure increases, increased carbon deposition in the combustion chamber, resulting in piston burning top.

    2. Injector drip or poor atomization, the diesel engine for a long time the top of the piston combustion, causing the top of the piston high temperature, so that the piston burning top.

    3. Improper piston top clearance, improper adjustment of the piston top clearance when assembling a diesel engine will affect the compression ratio of the diesel engine, resulting in burning of the piston cylinder or piston, which requires the diesel engine to be adjusted strictly in accordance with the requirements when assembled.

     4.Diesel cylinder fuel supply and fuel supply time uneven, so that part of the cylinder combustion process deteriorates, the formation of coke or serious afterburner, diesel combustion heat so that part of the cylinder piston top temperature is too high, resulting in thermal fatigue diesel engine material The burning, leading to burning the top of the piston.

5. Piston ring damaged or broken. Piston rings damaged or broken lead to the assembly of the piston ring can not close the cylinder wall, the piston top can not dissipate large-scale heat, but also lead channeling high temperature gas, the result is the top piston and piston ring groove overheating and melting.

     6.Piston cylinder liner quality problems, if the piston in the casting of the existence of porosity, porosity, micro-cracks, slag and other defects, under the action of high temperature and high pressure, these defects will become a source of fatigue and lead to fatigue fatigue; piston The slag is melted first, causing the piston to burn. Therefore, the choice of piston in the diesel engine must pay attention to choose the original or excellent quality piston.

     7. Overloaded diesel engine speed running for a long time, the destruction of the engine cooling. Pistons have a long-term thermal stress and mechanical stress, fatigue and ablation.

     8. Many small and medium-sized diesel engines due to the cylinder diameter is small, to complete the complex piston internal and external structure layout there are more difficult, so most of the piston is not provided with stiffeners,

Both increase the thickness of the piston top to meet the strength requirements, but too thick a piston top structure increases the heat capacity of the piston crown on the one hand and slows the heat dissipation on the other hand, both increasing the temperature of the piston crown causing the piston crown High thermal stress, easily lead to thermal fatigue damage to the top of the piston.