單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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