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

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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

单项选择题

The timing of diesel engine air starting valves is controlled by（）

A.the air start valve timing gears and rods
B.a cylinder check valve
C.individual cams and valve gear
D.an air manifold poppet valve