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单选题
If clearance between a piston and the cylinder wall is excessive, piston slap will occurThe slap itself is caused by （）
A
alternation of side thrust
B
a breakdown of the lube oil film on the cylinder wall
C
worn piston boss piston pin bearings
D
fluctuating gas pressure in the combustion space
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injectionC
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piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCC
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考题
单选题Which of the following statements concerning cylinder liner wear is true?（）A
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单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
Ⅰonly is correctB
Ⅱ only is correctC
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考题
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Piston seizureD
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考题
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compression pressure in the cylinder will be higherB
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单选题If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）A
micro-seizureB
stickingC
scratchedD
breakage/ollapse
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单选题Cold clearances between the skirt of an aluminum piston and the cylinder liner is about （）A
twice as large as with a cast iron pistonB
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half as large as with a cast iron pistonD
the same size as the crown of an aluminum piston
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