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Valve drive mechanism The valve drive mechanism commands the inlet and exhaust valves at the required timing. The valve drive mechanism consists of an inlet and exhaust cam follower 12 each suspended in a plunger of the tappet assembly 11, two tubular push rods 5 with ball joints, two nodular cast iron(球墨铸铁) rocker arms 3 suspended in a rocker arm bearing bracket, two yokes 6 and a yoke guide pins. See the figure below. The tappet rollers follow the cam profiles(轮廓) and transfer the movements through push rods to the rocker arms. The rocker arms operate the inlet and exhaust valves through yokes 6. Lubrication for the rocker arms comes from the engine’s secondary oil supply manifold through drillings in the cylinder head and rocker arm bracket(支架). The tappet assembly receives lubricating oil via channels in the engine block from the main supply manifold. For the roller and shaft, the oil is supplied through the guiding plunger. To compensate for heat expansion a clearance must exist between the rocker arm and yoke. All adjustments have to be done on a cold engine only. <此处为图片> (缺图)【缺少答案，请补充】

According to the passage, the best time to adjust the valve clearance is ( ) (缺图)

The roller and the tappet assembly are lubricated by means of ( )

According to the passage, the valve drive mechanism does not include ( )

To close valves tightly, which clearance should be inspected according to the maintenance schedule?

Compressor cleaning during engine operation The compressor may be cleaned by water injection during the engine operation. The cleaning process will have good results as long as the deposit formation has not gone too far. In case a very thick hardened crust of dirt the compressor has to be dismantled for cleaning. In this method of cleaning the water is not acting as a solvent but instead removes the deposits mechanically by the impact of the water droplets. It is therefore recommended to use clean water without additives. The water should not contain any additives which might remain on the compressor blades. Periodically cleaning of the compressor prevents or delays excessive build-up of dirt but in no way replaces the usual overhauls where the turbocharger is completely dismantled. The turbocharger is provided with a water container 34. During the cleaning procedure the container is pressurized with the charge air 35 and from where the water is forced to the compressor inlet 36. <此处为图片> (缺图)【缺少答案，请补充】

Which of the following statements can be used to clean the compressor with the engine running? (缺图)

What principal is used in this method of cleaning?

Which of the following statements is NOT correct?

The cleaning water should not contain any additives, because( )

According to the passage, the expression" HT" probably means( )

In order to maintain the charge air temperature we should control ( )

The charge air temperature departing from normal may indicate that( )

The function of the telltale hole is to( )

The first step of treatment of heavy fuel is ( )

The underlined sentence " Alternatively the main and stand-by separators may run in parallel" implies( )

The fuel oil viscosity is 90 mm2(平方)/s at 50 °C. The recommended throughput of rated capacity should be( )

According to the passage, which of the following statements is TRUE?

From the passage we know that the charge air temperature was controlled by ( )

The cooling water to cool the engine was forced ( )

After the charge air is discharged into the HT air cooler, ( )

Which of the following devices may be used to warm the engine prior to starting?

According to the passage, the liners of the starting air distributor ( )

During the starting process, when ( ), the main starting air valve is closed.

When some cylinder of the engine admits compressed air into it, the pilot piston of the starting air distributor should be ( )

From the passage we know that "Loctite" is probably( )

To keep the engine working properly, ( )

The periods for overhaul mainly depend on ( ) ① whether the lubricating oil and fuel are of good quality; ② what the load of the ship is; ③ whether the operator can find troubles and solve them quickly

It is necessary to make sure that there are no loose parts left in the crankcase before using the turning gear because( )

When does the piston rod stuffing box require overhaul?

The cylinder cover is made of cast iron and is provided with two inlet valves, two exhaust valves, a central mounted fuel injection valve and an indicator valve. The inlet valves are mounted with separate seating rings made of special heat- resistant cast iron. These rings are pressed into the cylinder cover in cooled conditions. The exhaust valve seatings are special , water -cooled seating rings. These rings are also pressed into the cylinder cover in cooled conditions. Each cylinder cover is provided with cooling water from a screwed- on tubular cooling water jacket through radial bores in the thick bottom of the cover. Each of the radial bores is connected to two side bores. The cover has further separate bores that lead to the cooling water jacket and the bores in the cylinder cover to a common outlet chamber. The cylinder cover and cylinder liner are assembled by means of four threaded studs screwed into the frame. Tightening is effected by means of hydraulic tools, and sealing by means of a thin ring mounted between the cylinder cover and the cylinder liner. A starting valve is mounted on the side of the cylinder cover. The engine has oil-cooled pistons of cast iron. The pistons are provided with three compression rings and a spring-loaded scraper ring. A space for cooling oil is provided at the top of the piston. The scraper ring prevents lubricating oil from being drawn up into the combustion chamber. Oil for cooling the piston crown is led from a bore in the crankshaft through a channel in the connecting rod and the connecting rod journal, to the bushing for the gudgeon pin. This bushing is provided with an annular groove from which part of the oil is led for lubricating the gudgeon pin. The remaining oil continues through bores in the gudgeon pin and the piston to piston cooling chamber.【缺少答案，请补充】

This passage is mainly about( )

According to the passage, which of the following may be provided on top of the cylinder cover? ①Two exhaust valves; ②A starting valve; ③An indicator.

According to the passage , which of the following is TRUE?

Which of the following is NOT TRUE?

Each of the engine cylinders is provided with a Bosch, type PF, fuel pump. The fuel pump is a single-acting plunger pump with non-adjustable stroke. The plunger is so accurately ground and lapped that its clearance inside the barrel is only 0.002-0.003 mm. This provides sufficient tightness between plunger and barrel, even at pressures as high as 200- 400 bar, without the need for sealing materials. Neither the plunger nor the barrel can therefore be renewed individually. The plunger pressure stroke is produced by a cam on the engine camshaft, whereas the return stroke, the suction stroke is effected by means of a strong coil spring. The top of the pump barrel is closed by a spring-loaded pressure valve, to which the fuel oil pipe for the respective fuel valve on the relevant engine cylinder is connected. Regulation of the amount of fuel delivered by the fuel pump is achieved by turning the pump plunger, the cylindrical surface of which has a milled recess. The bottom of this recess ends with an edge, which is at right angles to the cylinder generating lines, whereas the top of the recess is limited by a helix. This produces an inclined control edge on the plunger, which also has a narrow longitudinal groove. In the pump barrel are drilled two diametrical holes through which the fuel oil can flow into the fuel pump barrel. The pump barrel is surrounded by a regulating sleeve, the upper end of which is shaped as a toothed rim. The lower end has two lengthwise slots in which projecting lugs on the lower end of the plunger can slide up and down. The end of the regulating rod from the engine governor is designed as a toothed rack that engages with the toothed rim on the end of there regulating sleeve. This makes it possible to turn the pump plunger during engine operation.【缺少答案，请补充】

The fuel pump ( )