单项选择题

In a diesel engine, a cylinder liner should be replaced if it is （）
Ⅰ.Scuffed
Ⅱ.Scored

A.Ⅰ only is correct
B.Ⅱ only is correct
C.both Ⅰ and Ⅱ are correct
D.neither Ⅰ or Ⅱ are correct

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单项选择题

Under normal conditions, the main source of crankcase oil contamination is attributed to （）

A.metal particles loosened by wear
B.air when air cleaners are not used
C.condensation of water vapors
D.breakdown of the lubricating oil by dilution

单项选择题

Valve cages are used on some large diesel engines to （）

A.reduce wear on the valve stem
B.permit the use of alloy valve seat materials
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If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）

A.place standby cooler in operation
B.reduce engine load
C.check thermostatic valve
D.clean sea water strainer

In a diesel engine, a cylinder liner should be replaced if it is （） Ⅰ.Scuffed Ⅱ.Scored

相关考题

In a diesel engine, a cylinder liner should be replaced if it is （）
Ⅰ.Scuffed
Ⅱ.Scored