The possible reasons are as follows; discharge valve damage or over load operation of diesel engine, or leakage of nozzle, or the incomplete combustion in the cylinder because not enough fresh air was pumped.
The possible reasons are as follows; discharge valve damage or over load operation of diesel engine, or leakage of nozzle, or the incomplete combustion in the cylinder because not enough fresh air was pumped.
可能的原因如下；排气阀损坏或柴油机超负荷运转，或油嘴漏泄，或由于进气量不足导致燃烧不完全，等等。