单项选择题X 纠错
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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单项选择题
A.hard starting
B.excessive fuel consumption
C.loss of power
D.all of the above
单项选择题
A.provide added wear protection against today’s corrosive quality of fuel
B.increase overall valve strength due to the high gas pressures
C.assist in dissipating heat due to the extreme operating temperatures
D.reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering
单项选择题
A.Excessive piston to liner clearance
B.The underside of the piston crown being excessively dirty lowering the rate of heat transfer
C.Faulty nozzle spray
D.All of the above
单项选择题
A.improve skirt lubrication
B.allow for expansion
C.transmit forces evenly
D.improve the piston seal
单项选择题
A.Hard alloy steel construction
B.Beveled edges on the valve head
C.Low alloy steel construction
D.Poppet type design
单项选择题
A.a leaking seal ring
B.heat transfer from exhaust valves
C.restricted cooling passages
D.overheated intake valves
单项选择题
A.top of the ring groove
B.back of the ring groove
C.bottom of the ring groove
D.piston ring end clearance
单项选择题
A.oil rings only
B.compression and scraper rings
C.cylinder liner sealings
D.cylinder liner ring grooves
单项选择题
A.wrist pin bushings
B.compression rings
C.cylinder liner seals
D.cylinder liner sealing ring
单项选择题
A.Gasoline
B.Water
C.Lubricating oil
D.sulphur compounds
