Cd.9 Fuel Oil System
FUEL INJECTOR
What do we understand by atomizing when we talk about injectors?
C - That so solid beam of fuel shall be present.
How do we recognize a leaking fuel injector during testing?
A - If we have a sudden drop of pressure after the valve is supposed to be closed, this is caused by a leak.
Why must we never use grinding paste on the seating or on the gilding surface of a needle?
C - Any remaining grinding paste will corrode on the metal surface and after some time the needle will be damaged.
HIGH PRESSURE PUMP
Which main unit determines the increasing/decreasing of the fuel quantity, i.e. controls “the effective delivery stroke”?
A - The governor
What do we mean with “edge of cut off” when we talk about pumps with turntable plungers”?
C - The edge on the plunger which opens for the return line.
What do we mean with “dual controlled” fuel pumps when we talk about valve controlled fuel pumps?
A - Both the suction and spill valves are controlled.
VISCOSITY CONTROL
What do we mean by viscosity?
A - It can be termed as a resistance to flow.
What principle of measurement is the viscosity controlled based on?
C - Measurement of differential pressure.