Carbon deposit on the top of piston will form many hot surfaces, which will cause premature combustion and deflagration and shorten the service life of engine.

　　氣門及其座圈工作面上聚有積碳，會引起氣門關閉不嚴而漏氣，出現發動機難啟動、工作無力以及氣門易燒蝕等不良現象。氣缸蓋部位有了積碳，會降低發動機的冷卻效果，使發動機的動力性和經濟性都大大降低。

　　Carbon accumulation on the working face of the valve and its seat ring will cause the valve to close loosely and leak, resulting in engine difficult to start, inadequate work and valve easy to ablate and other undesirable phenomena. Carbon deposit in the cylinder head will reduce the cooling effect of the engine and greatly reduce the power and economy of the engine.

　　氣門導管和氣門桿部積碳結膠，將加速氣門桿與氣門導管的磨損，甚至會引起氣門桿在氣門導管內運動發澀而卡死。

　　Carbon deposit and cementing on the valve duct and stem will accelerate the wear of the valve rod and valve duct, and even cause the valve rod to move astringently and stuck in the valve duct.

　　活塞環槽內積碳，會使活塞環邊隙、背隙變小，甚至無間隙大墻壞造成活塞環膠結失去彈性，甚至折斷活塞環而拉缸。

　　Carbon deposit in piston ring groove will make piston ring edge clearance and back clearance smaller, and even cause the failure of large wall without clearance to lose elasticity of piston ring cementation, and even break the piston ring and pull the cylinder.

　　噴油嘴聚有積碳，極易卡死噴油嘴，造成發動機缺缸運行或突然熄火。

　　The fuel nozzle accumulates carbon, which can easily jam the fuel nozzle, resulting in engine cylinder shortage or sudden extinction.

　　預燃室啟動噴孔聚有積碳，將堵塞噴孔，使發動機啟動困難。

　　Carbon accumulation in the nozzle of the precombustion chamber will block the nozzle and make it difficult for the engine to start.

　　火花寒積碳過多，在燃油濕潤后，相當于火花塞電極間并聯分路電阻，造成火花寒漏電不能工作。

　　Spark cold deposits too much carbon, which is equivalent to parallel shunt resistance between spark plug electrodes after the fuel is wet, resulting in spark cold leakage can not work.