一台F165型柴油机难起动,功率下降。同时出现一种怪现象:工作时稍加大油门,气缸内就会发出“轰、轰”的响声,接着空气滤清器往外冒烟,柴油机自行熄火。拆检发现:配气正时齿轮与凸轮轴齿轮的记号准确对正;曲轴与正时齿轮、凸轮轴与凸轮轴齿轮键槽的相互位置没有改变;排气管、消音器内有大量积炭。测量活塞环的开口间隙达4毫米,而其使用极限只是1毫米。原来空气滤清器冒烟是由此引起的。活塞环磨损严重,导致压缩力下降,燃烧不完全,形成大量积炭。随着积炭的不断增多。柴油机排气不畅,空气进入量不足,这样 A F165 diesel engine difficult to start, the power down. At the same time there is a strange phenomenon: a little throttle when work, the cylinder will be issued “boom, boom ” sound, then smoke out of the air filter, diesel engine self-extinguishing. Disassembly found: the gear timing gear and camshaft gear accurate alignment; crankshaft and timing gear, camshaft and camshaft gear keyway mutual position has not changed; exhaust pipe, muffler has a lot of carbon deposition. The opening of the measuring piston ring has a clearance of 4 mm and its use limit is only 1 mm. The original air filter smoke is caused. Piston ring wear serious, resulting in decreased compression force, incomplete combustion, the formation of a large number of carbon deposition. With the continuous increase of coke. Diesel exhaust poor, lack of access to air, so