【 Main engine 】 Marine diesel engine cylinder how to emergency-【主机】船舶柴油机拉缸 如何应急

【 Main engine 】 Marine diesel engine cylinder how to emergency

Signs of vessel cylinder pulling

1.1 The cooling water outlet temperature of the cylinder and the cooling liquid outlet temperature of the piston of Marine diesel engine increase obviously.

1.2 Abnormal sound of dry friction between piston ring and cylinder wall can be heard.

1.3 The temperature of crankcase and scrubber of Marine diesel engine rises or alarms, and even smoke comes out.

1.4 When the crank crosses the upper position, there will be a knocking sound and the speed of the diesel engine will drop rapidly or stop by itself.

Two. The main reasons for cylinder pulling of Marine diesel engine are:

2.1 Poor lubrication of the cylinder

2.2 Insufficient run-in

2.3 Poor cooling

2.4 Piston ring fracture

2.5 Use of inferior fuel

2.6 Long-term overload

Iii. Marine diesel engine cylinder, how to emergency?

(1) When we find that individual cylinder liner of the ship's main engine has early cylinder pulling phenomenon (scavenging tank inspection), we should first consider increasing the cylinder filling amount of single cylinder, and check the quality of fuel in time, so as to sample and analyze residual oil of scavenging tank. If the overheating phenomenon is not eliminated, it is necessary to stop the oil of the single cylinder, reduce the speed, and strengthen the piston cooling until the overheating phenomenon disappears.

2) When the ship is sailing, if the main engine of the ship pulls the cylinder, quickly slow down and run slowly, then stop and immediately turn the car, the lubricating oil temperature of the main engine of the ship, appropriately reduce the temperature when conditions permit, there is a great cooling operation for the piston; At the same time, the cooling water temperature of the cylinder liner of the main engine can not be lowered.

(3) If the piston of the main engine of the ship is killed and the engine cannot be turned temporarily, the engine can be turned after the piston of the main engine cools down for a period of time.

(4) When the above method is still used, a small amount of kerosene can be injected between the piston and cylinder wall of the ship's main engine and the engine can be fully penetrated before starting. If the car still cannot be turned, remove the fastening nut connecting crosshead and piston rod (two-stroke diesel engine) or connecting rod bolt stroke diesel engine), lift the piston out slowly with special tools and engine room crane, and inject kerosene at the same time.

(5) After the piston of the ship's main engine is hoisted out, the damaged piston ring should be carefully checked and replaced with a new one, and the cylinder liner should be polished with an oilstone.

(6) Pay attention to check the oil filling hole and tubing joint when reloading. If there are new parts must be run - in.

(7) For the failure of pulling cylinder that cannot be repaired, the method of sealing cylinder operation can be adopted to deal with it.

【主机】船舶柴油机拉缸 如何应急 

一.船舶发生拉缸时的征兆 

1.1 船舶柴油机气缸冷却水出口温度和活塞冷却液出口温度明显升高。 

1.2 可以听到活塞环与气缸壁间干磨擦的异常声响。 

1.3 船舶柴油机曲轴箱和扫气箱温度升高或报警，甚至有烟气冒出。 

1.4 船舶柴油机发生拉缸的气缸当曲柄越过上点位置时，有敲击声发出且柴油机转速会迅速下降或自行停车。 

二.船舶柴油机发生拉缸的主要原因有： 

2.1 气缸润滑不良 

2.2 磨合不充分 

2.3 冷却不良 

2.4 活塞环断裂 

2.5 使用劣质燃油 

2.6 长期超负荷 

三.船舶柴油机发生拉缸， 如何应急？ 

(1)当我们发现船舶主机个别的缸套有早期拉缸现象（扫气箱检查时），应首先考虑单缸的加大气缸注油量，并及时检查燃油的质量，可以对扫气箱的放残油污取样化验分析。如过热现象不消除，要进行单缸停油、降速、加强活塞冷却直到过热现象消失为止。 

2)船舶在航行途中，如果船舶主机发生拉缸时，迅速降速慢车运行，然后停车并立即进行盘车，船舶主机的滑油温度，有条件的适当降低温度，对活塞有很大的降温作业；同时不能将主机的缸套冷却水温度调低。 

(3)如果船舶主机活塞咬死，暂时转不动车，可待主机活塞冷却一段时间再进行盘车。 

(4)当采用上述方法仍转不动车时，可向船舶主机的活塞与缸壁间注入少量的煤油并待充分渗透后再车。如仍转不动车，可拆下连接十字头与活塞杆的紧固螺帽(二冲程柴油机)或连杆螺栓冲程柴油机)，用专用工具和机舱吊车缓慢将活塞吊出，同时亦应加注煤油。 

(5)船舶主机的活塞吊出后，应仔细检查并将损坏的活塞环换新，同时用油石将缸套拉痕磨光。 

(6)重新装复时注意检查注油孔及油管接头。如有换新部件则必须进行磨合。 

(7)对无法修复的拉缸故障，可采取封缸运行的方法处理。