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1、Passage 1 （原题库第1篇） Valve drive mechanism The valve drive mechanism commands the inlet and exhaust valves at the required timing. 第3题The valve drive mechanism consists of an inlet and exhaust cam follower (8) each suspended in a plunger of the tappet assembly (7), two tubular push rods (4) with ball
2、joints, two nodular cast iron rocker arms (2) suspended in a rocker arm bearing bracket, two yokes (5) and a yoke guide pins. See Fig. 4-1. The tappet rollers follow the cam profiles and transfer the movements through push rods to the rocker arms. 第4题The rocker arms operate the inlet and exhaust val
3、ves through yokes (5). Lubrication for the rocker arms comes from the engines secondary oil supply manifold throughdrillings in the cylinder head and rocker arm bracket. 第2题The tappet assembly receives lubricating oil via channels in the engine block from the main supply manifold. For the roller and
4、 shaft, the oil is supplied through the guiding plunger. 第4题To compensate for heat expansion a clearance must exist between the rocker arm and yoke.第1题All adjustments have to be done on a cold engine only.1. According to the Passage, the best time to adjust the valve clearance is _.A. before the eng
5、ine is started B. when the engine is runningC. after the engine has just been stopped D. when something has gone wrong with the engine注：根据文章来看，调节阀间隙的最好时间是在发动机启动之前。2. The roller and the tappet assembly are lubricated by means of_.A. the main lube system B. the secondary oil systemC. the special pumpi
6、ng system D. the turbine oil system注：滚轮和挺杆组件借助于主润滑系统润滑。3. According to the Passage, the valve drive mechanism does not include_.A. tappet rollers B. push rods C. nodular cast iron D. yokes and guide pins注：根据文章来看，阀驱动机构不包括球墨铸铁。（包括挺杆滚轮、顶杆、吊梁和导销）4. To close valves tightly, which clearance should be insp
7、ected according to the maintenance schedule?A. The one between the cam and the tappet roller. B. The one between the push rods and the ban joints.C. The one between the rocker arms and the yoke D. The one between two tubular push rods.注：依据保养清单，要紧密的关闭阀件，应检查摇臂和吊梁之间的间隙。Passage 2 （原题库第3篇） Charge air coo
8、lerThe engine is equipped with a charge air cooler. The insert type charge air cooler is mounted in a welded casing (air trunk). The trunk is bolted to the engine block. 第1题Standard is a two-stage cooler mounted. The first stage, through which the charge air flows, is cooled with water from the HT c
9、ooling system and cooks the charge air till approx. 90 100oC. The second stage is supplied with water coming from the LT water system and cooks the charge air further till the required temperature of approx. 50oC. 第2题(B)By controlling the water flow through the LT cooler the charge air temperature c
10、an be kept constant at the required temperature. The circulating coolant water should always be under positive pressure and should be as clean as possible. The operating air temperature should be maintained by controlling the coolant inlet temperature. Whilst the engine is running the air and coolan
11、t temperatures and pressures at inlet and outlet should be checked and logged periodically. 第3题 Variations from normal indicate faults developing such as fouling of the film plates or obstruction of the water tubes.第4题Check daily, during operation of the engine, the working of the telltale hole at t
12、he free end of the charge air receiver. The function of this hole is to inform the operator the presence of water in the charge air receiver. Under normal condition only compressed air should escape from this hole.1. According to the Passage, the expression HT probably means_.A. HIGH TANK B. HIGH TE
13、MPERATURE C. HEAT TRANSMISSION D. HEAT TRANSFER注：根据文章来看, HT的意思是：high temperature，高温。2. In order to maintain the change air temperature we should control_.A. the coolant inlet temperature coming from the first stage coolerB. the coolant flow coming from the second stage coolerC. the coolant outlet te
14、mperature coming from the second stage coolerD. the coolant flow coming from the flint stage cooler注：为维持增压空气的温度，我们应控制来自第二级冷却器的冷却剂流量。3. The charge air temperature departing from normal may indicate that_.A. condensate can be formedB. only compressed air should escape from the telltaleC. the film plat
15、es are becoming dirty or the water tubes are blocked by scaleD. cooling water may have been carried into the cylinders注：增压空气温度偏离正常表明镀膜变脏或水管被水垢堵塞。4. The function of the telltale hole is to_.A. detect whether compressed air has escaped from the holeB. control the coolant inlet temperatureC. determine
16、whether the coolant water is under positive pressureD. inform the operator the presence of water in the charge air receiver注：警报孔或监视孔的作用是同志作业员扫气箱中有水。 telltale hole监视孔，指示孔，警报孔； charge air receiver. 扫气箱Passage 3 （原题库第6篇） 第1题 At the first start, listen carefully for possible jarring sounds. If anything
17、is suspected, stop the engine immediately, otherwise stop the engine after 5 minutes idling. Check at least the temperatures of the main and big end bearings and of all other bearings which have been opened. Make visual inspection from below to the cylinder liners and piston skirts which have been o
18、pened. If everything is in order, restart.第4题(A) Check that there is no leakage of gas, water, fuel or lubricating oil. Especially observe the fuel lines, HP fuel pumps and injectors. 第4题(B) Watch the quantities emerging from the leak oil pipes! Check that the starting air manifold is not hot at any
19、 cylinder (leaky starting valve may cause explosion! After overhaul, the following instructions are important: - check pressure and temperature gauges. - check the automatic alarm and stop devices. - check the pressure drop over the fuel filter and lubricating oil filter.第2题(C) - check the oil level
20、 in the oil sump/oil tank. 第2题(D) Estimate the condition of the oil. - check the de-aerating of the engine circulating water system.第2题(A) - check the quantity of fuel leak. 第4题(C) - check the telltale holes for leaks.- check the circulating water quality第2题(B) - check the cylinder pressures. - list
21、en for jarring sounds. - check the crankcase pressure. - check the starting air manifold. Running-in is mainly intended to let piston rings wear to fit properly in the cylinder liner. 第3题(D) Do not continuously run at constant load during the running -in process (Fig. 4-4). It is important to vary t
22、he load several times. The ring grooves in the piston will have a different tilting angle at each load and consequently the piston ring has a different contact line to the cylinder liner wall.1. Paragraph 1 tells us that_.A. If we hear vibration sounds, we should stop the engine quickly, or allow it
23、 to operate at low speed for 5 minutes, then stop it and check everythingB. If we hear vibration sounds, we should stop the engine quickly, otherwise the engine will be stopped automatically after 5 minutesC. If we hear explosion sounds we should stop the engine then check everythingD. if we hear su
24、rging sounds, we should stop the engine immediately otherwise after 5 minutes the engine will be destroyed注：从第一段可知，如果听到震动声，应快速停车，或让它低速运行5分钟，然后停车并检查所有部件。2. After overhaul, following instructions are important except_.A. release air from the engine circulating water systemB. treat the circulating wate
25、r if necessaryC. make sure the pressure drop is enough besides the fuel filterD. make sure the quantity of lube oil meets the requirement注：检修之后，确保除了燃油过滤器以外的压降足够大的指令不重要。besides=in addition to 除了以外，还3. After piston overhaul, the running-in process should be carried out_.A. periodically at steady load
26、B. occasionally at various loadC. continually at constant load D. continually at various load注：活塞检修之后，磨合过程应在各种负载状态下连续进行。4. When dealing with engine troubles, _.A. no leakage of lubricating oil should be checked.B. quantities of oil emerging from the leak oil pipes must be watchedC. quality of the le
27、ak oil must be watchedD. the number of the leaking fuel lines should be checked注：处理发动机故障时，一定要观察在漏油管路中出现的油量。Passage 4 （原题库第18篇） 第2题 The cooling water in the HT (high temperature) circuit cools the cylinder liners, cylinder heads and turbocharger. From the pump water is supplied to the engine manifold
28、 which is cast in the engine block. From the manifold the water is distributed to all cylinder liner sections and from each liner upwards through the cooling water channels in the liner collars. From the liner collars further into the cylinder heads. In the cylinder head the water is forced by an in
29、termediate deck to flow along the flame plate, around the valves to the exhaust valve seats and up along the fuel injector sleeve. From the cylinder head the water is discharged via a connection piece into the discharge manifold.第3题 The return water from the cylinder heads and turbocharger is suppli
30、ed to the HT air cooler. In the first stage of this cooler, most of the heat from the charge air is extracted.第1题The LT circuit water cools the charge air in the second stage. The necessary cooling for the LT water is gained from a central cooler. By controlling the LT water temperature to the inter
31、-cooler the correct charge air temperature can be obtained.For preheating purposes, a heater circuit with a pump and heater are connected in the HT circuit before the engine. 第4题 Before starting, the HT circuit is heated till about 60oC by a separate heater. The preheating of the engine is, prior of
32、 starting up and loading on HFO, of utmost importance.1. From the Passage we know that the charge air temperature was controlled by_.A. sea water from a central cooler B. fresh water from a central coolerC. fresh water from a HT circuit D. fresh water from the LT circuit注：从文章来看，我们了解到增压空气温度由来自低温回路的淡水
33、控制。2. The cooling water to cool the engine was forced_.A. into the cylinder block and then upwards into the cylinder headB. into the cylinder intermediate section and then upwards into the cylinder headC. into the cylinder head and then downwards into the cylinder blockD. into the cylinder ends and
34、then further into the cylinder intermediate注：冷却发动机的冷却水被迫进入汽缸体然后向上进入汽缸头（缸盖）3. After the charge air is discharged into the HT air cooler, _.A. the charge air temperature will become higher B. the charge air temperature will become lowerC. the HT water temperature will remain constant D. the HT water t
35、emperature will become lower注：增压空气排入高温空冷器后，增压空气温度变低。4. Which of the following devices may be used to warm the engine prior to starting?A. A high temperature cooling water system B. A low temperature cooling water systemC. A central cooler D. The second stage cooler注：高温冷却水系统在启动之前用于暖机。Passage 5 （原题库第1
36、9篇）Starting air systemThe engine is started with compressed air of max 30 bar. Minimum pressure required is 15 bar. A pressure transmitter PI301 mounted on the starting air line before the main starting valve has an indicator in the instrument panel. 第3题The supply line from the starting air bottles
37、is provided with a non return valve and a drain valve.The solenoid valve is electrical (remote control) or manual (on the engine) operated and send after activation a pilot air signal to the main starting air valve. Interruption of the control air doses the main starting air valve.第1题（ After the mai
38、n starting air valve is activated the air flows through the flame attesters to the starting air valves in the cylinder heads. Part of the air flows via the starting air distributor to each of the starting air valves in the cylinder heads. The starting air distributor controls the timing of opening a
39、nd closing of the starting air valves.第2题 On the moment the main starting air valve is operated also the governor booster is energized. ）The main starting air line is provided of a safety valve.第4题 Interlock valve is a safety device to avoid an engine start with engaged turning gear.1. As the engine
40、 is started with compressed air, the correct sequence of the following devices being activated is_.(1) solenoid valve; (2) starting air valve; (3) starting air distributor; (4) main starting air valve; (5)governor booster.A. (1), (5), (4), (2), (3) B. (1), (4), (5), (3), (2) C. (1), (4), (3), (2), (
41、5) D. (4), (3), (1), (2), (5)注：从括号部分总结出，发动机由压缩空气启动时，装置被触发的顺序是：电磁阀、主启动阀、调速器升压器、启动空气分配器、启动空气阀。2. The sentence the governor booster is energized (paragraph3) probably means_.A. the governor booster is supplied with electric powerB. hydraulic oil is pumped into the governor boosterC. the governor starts
42、 to work before starting the engineD. the governor booster is supplied with pressurized air before starting the engine注：句子“ 调速器升压器被提供能量”大概意思是：启动发动机之前，调速器升压器被提供增压空气。3. Which of the following components are attached to the air bottles?A. a pressure transmitter PT 301 B. a non-return valve and a drain
43、valveC. a solenoid valve D. a starting air distributor注：答案应为B。连到空气瓶的部件是：止回阀和放残阀。4. When the engine is engaged with turning gear, _ can keep the engine from startingA. the control air B. the solenoid valve C. the main starting air valve D. the interlock valve注：发动机由盘车机啮合时，连锁阀可防止发动机启动。Passage 6 （原题库第20
44、篇） Starting air distributor第1题The starting air distributor is of the piston type with precision machined inter changeable liners. The liners as well as the pilot pistons are of corrosion resistant materials.第3题 The pilot pistons are controlled by a cam connected to the camshaft end. When the main st
45、arting valve opens, the pilot pistons axe pressed onto the cam, whereby the pilot piston for the engine cylinder which is in starting position admits control air to the main piston of the starting valve. 第2题The starting air valve opens and admits compressed air into the engine cylinder forcing that
46、piston down. Shortly before the exhaust valves are opened the pilot valve interrupts the control air to the starting air valve and starting air to that cylinder is stopped. This procedure will be repeated as long as the main starting valve is activated or until the engine speed is so high that the e
47、ngine fires. After the main starting air valve is closed, the main starting air system is de-aerated, the pressure drops quickly and the springs will lift the pilot plungers off the cam. This means that the pilot plungers touch the cam only during the starting process and thus wear is insignificant. If a pilot liner is worn out, press it out. It may be necessary to heat the distributor up till about200oC as Loctite is used for fixing and sealing.1. According to the Passage, the line
