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Top burning of engine piston mostly occurs at the top of piston and the first and second piston ring grooves, and the damage forms mainly include the top surface melting hole, perforation, pockmark and the keyway notch and collapse around the top.
Top burning of engine piston mostly occurs at the top of piston and the first and second piston ring grooves, and the damage forms mainly include the top surface melting hole, perforation, pockmark and the keyway notch and collapse around the top.
The burning of piston top will lead to the burning of high temperature gas into the crankcase, the oxidation deterioration of lubrication, the deterioration of cylinder sealing, the decrease of compression ratio, the deterioration of fuel combustion process, and the decrease of engine power and economy. In serious cases, the piston cracks and breaks, damaging cylinder liner, even waste, crankshaft, body and other parts.
Piston head damage
Wear and tear caused by overheating
1.Overheating caused by abnormal combustion
2.Bent/blocked fuel injector
3.The wrong piston is installed
4.Cooling system failure
5.The clearance at the upper part of the working face becomes narrower
Collision traces
1.There is too much piston bulge
2.Excessive rework of cylinder head mating surface
3.Incorrect valve indentation
4.Wrong cylinder pad
5.Grease deposition at piston head
6.The valve clearance is too small
7.Valve control time error due to setting error or tooth strap loss
Material melt
1.The fuel injector is faulty
2.Fuel injection is wrong
3.Injection time is wrong
4.Compression ratio insufficient ignition delay
5.Oscillation in the fuel injection line
Piston top and combustion chamber ruptured
1.A faulty or faulty fuel injector
2.Fuel injection is wrong
3.Injection time is wrong
4.Insufficient compression ratio
5.Poor piston cooling
6.Incorrect installation of a fluted piston
7.The power to improve
The key practices to prevent the ablation of the piston top are:
1.Strengthen the maintenance of diesel engine, so that the diesel engine always maintain a good technical state.
2.Avoid overheating, carbon deposition and deflagration of diesel engine.
3.Correct use of diesel engine to avoid its long-term overload.
4.Diesel engine maintenance process, in strict accordance with the technical requirements of the assembly of all parts of the diesel engine, special attention to fuel injector, air compressor and other parts of the quality of the state, to avoid the failure of these parts and lead to the top of the piston ablation fault
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