（）is harmful for fuel pumps, fuel valves, cylinder liner, exhaust valve seats, and the turbocharger blades as well.
For an ordinary four-stroke engine the exhaust valves open （）.
Exhaust temperature increases in all cylinders, the possible cause may be（） (1) increased scavenging air temperature (2) air in fuel pumps and fuel valves (3) fouling of air and gas passages
The needle valve will open when the fuel pressure acting on the needle valve （） exerts a sufficient force to overcome the spring compression.
During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）
In an engine with air inlet valve and exhaust valve on its cylinder heads the fresh air will enter into the cylinder （） and the gases exhaust （）, there being an adequate overlap between the inlet opening and the exhaust closing.
The bypass valve on a self-contained breathing device should be opened if（）.
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke
If the needle valve in a fuel injection nozzle sticks open （）.
Which of the valves listed should be used either in the fully opened or the fully closed position?（）
The exhaust valve opens before bottom dead center in a four stroke engine to（） Ⅰ.allow for blow down Ⅱ.Reduce pumping losses
Excessive valve lash in an auxiliary diesel engine will cause the valves to open（）
The satisfactory operation of diesel engine exhaust valves usually depends on（）
The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.
For an ordinary four-stroke diesel engine the exhaust valves close （）.
（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.
In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure
Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）
Leaky exhaust valve will result in which of the following?（） (1) high exhaust temperature; (2) low compression pressure; (3) low firing pressure.
When the relief valve opens it discharges high pressure refrigerant vapor to the （）.
In an ordinary four-stroke engine the exhaust valves open （）
Leaky exhaust valve will result in which of the following？①high exhausttemperature ②low compression ③low firing pressure
In a turbocharged four-stroke/cycle diesel engine, the exhaust valve remains open until after top dead center and the intake valve opens before top dead center to_______.
