哈工程轮机英语--lesson 11.ppt

Lesson 11 Operating troubles and their remedies New Words and Expressions in Text remedy 排除(方法)，补救(措施) stick 粘住，卡住 failure 失败，失灵 delay 延迟，滞后 watch 观察 common 普通的，普遍的 result 由……引起，产生 diagram 图 unequal 不相等的 locate 找出，定位 slacken 放松，减缓 trace 查找，寻找 responsibility 责任 on the part of 在……方面 Troubles may occur when the engine is running. If the engine does not start on air, it may be due to one or more of the following causes: starting air pressure(2.5—3.0MPa) too low, incorrect timing of starting air valves, one or more of the starting valves or distributor valves stuck in closed position, master valve not actuated, stop valve on air line is closed, or if starting after working on the engine, the turning gear still engaged. If the engine turns too slowly or irregularly on starting air, the possible causes may be the pistons in starting air distributor sticking, starting valves in cylinder covers defective, faulty timing of the distributor. The starting air pressure too low may also be another cause. If the engine does start on air, but combustion does not immediately begin, the cause may be low compression, failure of the fuel pumps to discharge oil into the fuel valves or incorrect timing of fuel pumps. Failure of fuel injection is usually due to the troubles in the fuel injection pumps. *However, the injection may be delayed, though the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air. If there is no fuel injected into the cylinders, the possible causes are fuel gasification(汽化) due to excess temperature, pressure before fuel injection pumps too low, fuel too cold, except the troubles in the injection pumps. *Sluggish(行动迟缓的) movement of maneu