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When adjusting a low spring injector nozzle NOP, what should be done to increase opening pressure?


A) turn adjusting screw CW
B) turn adjusting screw CCW
C) subtract shims
D) add shims

Correct Answer

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In a running engine with a CR diesel system, what force(s) hold the nozzle needle seated when the actuator is not energized?


A) hydraulic force only
B) spring force only
C) electrical force only
D) combined spring and hydraulic force

Correct Answer

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What force(s) hold an EHI nozzle needle seated in a standard CR system when the engine is stationary and there is no measurable rail pressure?


A) hydraulic pressure only
B) spring pressure only
C) electrical pressure only
D) combined spring and electrical force

Correct Answer

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Technician A says that after replacing an injector spring on a hydraulic multi-orifice injector, it is good practice to set NOP 75 psi above specification. Technician B says that any time a hydraulic nozzle assembly is reassembled after bench testing, it is good practice to set NOP 150 psi above specification. Who is right?


A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Correct Answer

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When nozzle back leakage is higher than specification, this is usually an indication of:


A) wear
B) nozzle valve cavitation
C) nozzle seat erosion
D) injector spring fatigue

Correct Answer

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If injector valve-to-nozzle body clearance in a multi-orifii injector is greater than specification, which of the following values would increase?


A) NOP
B) peak pressure
C) back leakage
D) residual line pressure

Correct Answer

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What pressure is dead volume fuel held at in pump-line-nozzle (PLN) diesel fuel systems?


A) charging pressure
B) delivery valve opening pressure
C) nozzle opening pressure
D) residual line pressure

Correct Answer

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The highest pressure that a diesel injection circuit is subject to is known as:


A) maximum system pressure
B) peak pressure
C) collapse pressure
D) NOP

Correct Answer

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Which of the following components in a multi-orifice hydraulic injector is constantly exposed to line pressure?


A) nozzle valve seat
B) nozzle valve stem
C) nozzle valve spring
D) nozzle pressure chamber

Correct Answer

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What are the functions of a typical hydraulic injector nozzle?


A) define nozzle opening pressure (NOP)
B) atomize the fuel charge
C) target fuel to the correct area of the engine cylinder
D) all of the above

Correct Answer

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What is the advantage of piezo actuators over solenoid actuators?


A) lower cost
B) lighter weight
C) faster response
D) higher peak pressure potential

Correct Answer

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