The cause of valve breakage may be:
1.itself in the processing and heat treatment process to produce cracks;
2.the valve seat is twisted so that the valve is subjected to bending stress;
Impact due to valve touch piston, valve mechanism transmission parts improper movement or improper clearance and impact;
4.The valve head temperature distribution is uneven and thermal stress is generated.
In order to prevent early valve wear, burn and break, should pay attention to the following aspects: 1.Strict control of the valve mechanism of the amount of lubricant, too much easy to generate carbon accumulation, too little will accelerate wear.
2.The valve seat, valve and valve ducts should be strictly guaranteed concentric.
3.Properly adjust the valve clearance to prevent the valve from touching the piston.
4.Strict control of cooling water temperature, improve the cooling effect of diesel engine.