单项选择题
Excessively worn, or polished ends on a diesel engine valve spring, indicate（）
A.burned exhaust valves
B.excessive spring compression
C.spring surge
D.worn valve seats
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相关考题
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单项选择题
A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）
A.worn valve seats
B.worn main bearing
C.excessive valve clearance
D.weak rocker arm springs -
单项选择题
In the cylinder of a diesel engine fuel is ignited by the（）
A.spark from a plug in the pre-combustion chamber
B.electrical discharge from the distributor
C.heat of compression within the cylinder
D.heat from the fuel injection nozzle -
单项选择题
Diesel engine air start valve timing is controlled by（）
A.engine operating speed
B.an air manifold
C.a hydraulic distributor
D.individual cams and valve gear
