Mechanical Fuel Injections And Governors

A governor that has highly controlled speed droop is known as a(n) _____________ governor:

limiting speed

variable speed

isochronous

hydraulic

Correct! Wrong!

On an engine equipped with a mechanical diesel fuel system, when an operator moves the throttle through the speed ranges, he is altering the governor''s

flyweight position

spring tension

torque spring

buffer screw

Correct! Wrong!

On a fuel injection pump utilizing the port and helix system, what are the positions of the control edge of the helix for the fuel delivery volume?

rack

sleeve

plunger

delivery valve

Correct! Wrong!

On an in-line fuel injection pump utilizing the port and helix system, what tries to maintain system line pressure for a rapid rise and fall of injection pressures?

the fuel rack assembly

sleeve metering valve

supply pump return restriction

delivery valve

Correct! Wrong!

Technician A says that a limiting speed governor attempts to keep the engine RPM at a nearly constant rate even though the load on the engine may change. Technician B says that a limiting speed governor will control minimum and maximum engine RPM. Who is correct?

Technician A.

Technician B.

both A and B.

neither A nor B.

Correct! Wrong!

What controls the maximum pressure in a high pressure injector fuel line?

rack and linkages.

plunger and barrel.

needle, seat and orifices assm.

delivery valve and closing spring.

Correct! Wrong!

When a technician adjusts all the plungers so that they repeatedly produce the exact quantity of fuel, he is said to be ___________ the fuel pump.

calibrating.

timing.

phasing.

metering.

Correct! Wrong!

On a port and helix fuel pump, when the rack rotates the plunger so that the vertical groove is aligned with the fill port, the pump is said to be in the:

full fuel position.

peak torque position.

no fuel position.

idle position.

Correct! Wrong!

On a port and helix fuel pump system, when the rack rotates the plunger so that the narrowest part of the helix is aligned with the fill/spill ports, the pump is said to be in the:

full fuel position.

peak torque position.

no fuel position.

idle position.

Correct! Wrong!

Injection nozzles that open with the needle valve moving away from the combustion chamber are said to be:

inward opening.

outward opening.

chattering.

coking.

Correct! Wrong!

When working with injection nozzles, you should:

keep hands out of the path of the high pressure spray.

wet hand with fuel before handling precision parts.

keep parts and work area extremely clean.

all of the above.

Correct! Wrong!

When bench testing a set of high pressure injection nozzles, Technician A says that when checking injection nozzles you should check the cracking pressures and forward leakage. Technician B says that you should check the spray pattern and back leakage. Who is correct?

Technician A.

Technician B.

both A and B.

neither A nor B.

Correct! Wrong!

A high pressure fuel injection pump that uses a rack to move a fuel volume control device up and down on the outside of the injection plunger and barrel is known as a _______________ type fuel pump.

sleeve metering.

port and helix.

pressure timed.

distributor.

Correct! Wrong!

If the device mentioned in the previous question were to be moved all the way up, the fuel pump would be in the ______________ position.

full fuel.

idle.

partial fuel.

no fuel.

Correct! Wrong!

A mechanical governor operates on the principle of:

spring tension and flyweight speed in opposition.

intake manifold pressure and spring tension reacting upon a diaphragm.

intake manifold pressure and flyweight speed reacting upon a diaphragm.

turbo speed and spring tension on the torque shaft.

Correct! Wrong!

When spill timing a fuel injection pump using the port closing method you would be dealing with a pump having helices with:

variable beginnings and variable endings.

variable beginnings and constant endings.

constant beginnings and constant endings.

constant beginnings and variable endings.

Correct! Wrong!

When mounting a fuel injection pump to an engine and adjusting the fuel pump drive so that pins will enter their respective holes in the flywheel and fuel pump, you are said to be ______________ the fuel pump to the engine.

phasing.

metering.

calibrating.

timing.

Correct! Wrong!

On a diesel injected engine, if a delivery valve does not seat properly, the engine would:

show no noticeable change.

miss.

stall.

go to maximum governed RPM.

Correct! Wrong!

Technician A says that a fuel injection pump with port and helix system uses a mechanical actuated injector. Technician B says that a distributor type fuel system uses a hydraulically actuated injector. Who is correct?

Technician A.

Technician B.

both A and B.

neither A nor B.

Correct! Wrong!

What will occur if the cracking pressure in a high pressure nozzle is too low?

early injection.

late injection.

uncontrolled burn.

all of the above.

Correct! Wrong!

The most common injection nozzle used with direct injection is the:

multi-hole nozzle.

pintle nozzle.

pintaux nozzle.

delay nozzle.

Correct! Wrong!

The amount of RPM fluctuation from maximum RPM no load to maximum RPM full load is known as:

rated speed.

peak torque.

droop.

hunting.

Correct! Wrong!

A fuel pressure gauge test on an engine may indicate:

transfer pump pressure.

fuel filter condition.

the recommended pressure at an idle and run positions.

all of the above.

Correct! Wrong!

On a diesel fuel system, when the governor flyweights extend, they change spring tension to move the rack to a ______________ fuel position.

increased.

lesser.

minimum.

full.

Correct! Wrong!

On a fuel injection pump system, what is the purpose of the restricted fitting in the return fuel line at the outlet of the fuel pump?

acts as a relief valve for the transfer pump.

maintains transfer pump pressure.

prevents injectors from receiving fuel pressure.

keeps the fuel lines from draining back to the fuel tank.

Correct! Wrong!

Which fuel injector type is used by Detroit 2 cycle diesels and Cummins PT injection systems and others?

pressure timed.

unit injectors.

sleeve metering.

distributor type.

Correct! Wrong!

Injector timing is done on a Detroit Diesel unit injectors by:

timing the pump to the engine using locator timing pins.

changing shims under the cam follower housings mounting plates.

lengthening or shortening the injector plunger movement.

rotating the injection pump at its mounting flange.

Correct! Wrong!

What is the purpose of a buffer spring in an engine governor?

adjustment to limit high engine RPM.

adjustment to limit engine hunting.

adjustment to limit movement of the flyweights.

returns the AFC diaphragm to rest position.

Correct! Wrong!

What will be the effect if injector plungers are set higher than specifications in a Detroit Diesel 2 cycle engine?

advanced injection.

over fueling.

retarded injection.

under powered.

Correct! Wrong!

Technician A says that a Bosch and a Detroit fuel system use a mechanical type injector. Technician B says that a Bosch and a Detroit fuel system use a port and helix system. Who is correct?

Technician A

Technican B

Both A and B

Neither A nor B

Correct! Wrong!

An operator complains that his engine idle is about 100 RPM more than it was a few days ago, on his Detroit Diesel 8-92 2 cycle engine, what is the likely problem?

injectors out of adjustment.

governor gap out of adjustment.

one injector stuck in the full fuel position.

all of the above.

Correct! Wrong!

Which of the following systems would control the volume for fuel injections by modifying and controlling pressures within the low pressure supply system relative to engine rpm?

pressure timed.

port and helix.

sleeve metering.

distributor.

Correct! Wrong!

Technician A says that a Cummins engine operational timing may be adjusted by the use of an offset key on the camshaft. Technician B says that a Cummins engine may be timed by adding or subtracting shims or gaskets from under the cam follower housing covers. Who is correct?

Technician A.

Technician B.

both A and B.

neither A nor B.

Correct! Wrong!

The term hydraulic governor refers to a governor in which the:

the governor spring and flyweights are counter-balanced by a spool valve.

governor speed sensing is aided and balanced by internal oil pressure.

high idle is controlled hydraulically.

peak torque is controlled by fuel pressure.

Correct! Wrong!

On some distributor type fuel systems, timing may be adjusted by:

injector height adjustment.

metering valve adjustment.

rotating the fuel pump at its mounting.

timing may not be altered.

Correct! Wrong!

The metering valve in a cam and plunger distributor type fuel pump controls the amount of _____________ within the pumping element prior to injection.

low pressure fuel.

high pressure fuel.

high and low pressure fuel.

fuel pressure for timing advance.

Correct! Wrong!

In a distributor type fuel pump, the cam ring and plungers produce _____________ sent to the injectors.

low pressure fuel.

high pressure fuel.

high fuel volume.

low fuel volume.

Correct! Wrong!

The governor on a cam and plunger distributor type fuel controls the:

racks.

metering valve.

delivery valve.

cam ring.

Correct! Wrong!

In a cam and plunger distributor type fuel pump, a hydraulically actuated plunger and counter-balancing spring, automatically moves the ________________ back and forth with changing engine speeds, to alter the injection timing advance.

metering valve.

cam ring.

rollers and plungers.

charging ring.

Correct! Wrong!

Before removing a fuel injection pump, you must locate the engine and injection pump for timing and position so that the injecton pump can be easily reinstated in the correct position.

True.

False.

Correct! Wrong!

To locate a faulty injector on a Cummins PT injection system you should:

loosen the lines one at a time and listen for a change in engine performance.

hold each injector on its seat and listen for a change in engine performance.

loosen the injector adjusting screw locknut and back out the injector while listening to the engine.

open the bleed line on each injector and listen for a change in engine performance.

Correct! Wrong!

When servicing injectors, you should always remember to:

clean the parts in new fuel only.

never interchange plungers and barrels.

test them for operation before and after cleaning.

all of the above.

Correct! Wrong!

If a back-hoe operator sets the engine at 1500 RPM, and a small load is applied to the engine, the variable speed governor will:

drop off substantially and return to set RPM.

fall to an idle.

maintain speed within the droop adjustment setting.

surge to a higher RPM and return to set RPM.

Correct! Wrong!

Pintle type fuel injection nozzles are used with:

direct injection.

pre-combustion chambers.

electronic fuel injection.

two stroke cycle engines.

Correct! Wrong!

Caterpillar capsule type injectors are adjusted:

on the VS mark.

at TDC.

at the factory.

when the exhaust valves are open.

Correct! Wrong!

What engine performance measurement is found by using the following formula: Torque x RPM divided by 5252:

torque.

horsepower.

mean effective pressure.

volumetric efficiency.

Correct! Wrong!

A port and helix fuel injection pump using plungers with upper helices would have injection timing with a:

variable beginning.

variable beginning and ending.

constant beginning.

variable ending.

Correct! Wrong!

Technician A says that a fuel system must supply the correct quantity of fuel and time the fuel delivery. Technician B says that a fuel system must control the delivery rate and distribute the fuel evenly into the cylinder. Who is correct?

Technician A.

Technician B.

both A and B.

neither A nor B.

Correct! Wrong!

On a test bench, when a technician adjusts a fuel pump so that the beginning of injection event occurs exactly the correct number of degrees apart, he is said to be ________________ the fuel pump.

calibrating.

timing.

phasing.

metering.

Correct! Wrong!

An automatic timing advance mechanism varies injection timing in relation to:

engine load.

engine speed.

throttle position.

governor action.

Correct! Wrong!

A governor that has highly controlled speed droop is known as a(n) _____________ governor:

On an engine equipped with a mechanical diesel fuel system, when an operator moves the throttle through the speed ranges, he is altering the governor''s

On a fuel injection pump utilizing the port and helix system, what are the positions of the control edge of the helix for the fuel delivery volume?

On an in-line fuel injection pump utilizing the port and helix system, what tries to maintain system line pressure for a rapid rise and fall of injection pressures?

Technician A says that a limiting speed governor attempts to keep the engine RPM at a nearly constant rate even though the load on the engine may change. Technician B says that a limiting speed governor will control minimum and maximum engine RPM. Who is correct?

What controls the maximum pressure in a high pressure injector fuel line?

When a technician adjusts all the plungers so that they repeatedly produce the exact quantity of fuel, he is said to be ___________ the fuel pump.

On a port and helix fuel pump, when the rack rotates the plunger so that the vertical groove is aligned with the fill port, the pump is said to be in the:

On a port and helix fuel pump system, when the rack rotates the plunger so that the narrowest part of the helix is aligned with the fill/spill ports, the pump is said to be in the:

Injection nozzles that open with the needle valve moving away from the combustion chamber are said to be:

When working with injection nozzles, you should:

When bench testing a set of high pressure injection nozzles, Technician A says that when checking injection nozzles you should check the cracking pressures and forward leakage. Technician B says that you should check the spray pattern and back leakage. Who is correct?

A high pressure fuel injection pump that uses a rack to move a fuel volume control device up and down on the outside of the injection plunger and barrel is known as a _______________ type fuel pump.

If the device mentioned in the previous question were to be moved all the way up, the fuel pump would be in the ______________ position.

A mechanical governor operates on the principle of:

When spill timing a fuel injection pump using the port closing method you would be dealing with a pump having helices with:

When mounting a fuel injection pump to an engine and adjusting the fuel pump drive so that pins will enter their respective holes in the flywheel and fuel pump, you are said to be ______________ the fuel pump to the engine.

On a diesel injected engine, if a delivery valve does not seat properly, the engine would:

Technician A says that a fuel injection pump with port and helix system uses a mechanical actuated injector. Technician B says that a distributor type fuel system uses a hydraulically actuated injector. Who is correct?

What will occur if the cracking pressure in a high pressure nozzle is too low?

The most common injection nozzle used with direct injection is the:

The amount of RPM fluctuation from maximum RPM no load to maximum RPM full load is known as:

A fuel pressure gauge test on an engine may indicate:

On a diesel fuel system, when the governor flyweights extend, they change spring tension to move the rack to a ______________ fuel position.

On a fuel injection pump system, what is the purpose of the restricted fitting in the return fuel line at the outlet of the fuel pump?

Which fuel injector type is used by Detroit 2 cycle diesels and Cummins PT injection systems and others?

Injector timing is done on a Detroit Diesel unit injectors by:

What is the purpose of a buffer spring in an engine governor?

What will be the effect if injector plungers are set higher than specifications in a Detroit Diesel 2 cycle engine?

Technician A says that a Bosch and a Detroit fuel system use a mechanical type injector. Technician B says that a Bosch and a Detroit fuel system use a port and helix system. Who is correct?

An operator complains that his engine idle is about 100 RPM more than it was a few days ago, on his Detroit Diesel 8-92 2 cycle engine, what is the likely problem?

Which of the following systems would control the volume for fuel injections by modifying and controlling pressures within the low pressure supply system relative to engine rpm?

Technician A says that a Cummins engine operational timing may be adjusted by the use of an offset key on the camshaft. Technician B says that a Cummins engine may be timed by adding or subtracting shims or gaskets from under the cam follower housing covers. Who is correct?

The term hydraulic governor refers to a governor in which the:

On some distributor type fuel systems, timing may be adjusted by:

The metering valve in a cam and plunger distributor type fuel pump controls the amount of _____________ within the pumping element prior to injection.

In a distributor type fuel pump, the cam ring and plungers produce _____________ sent to the injectors.

The governor on a cam and plunger distributor type fuel controls the:

In a cam and plunger distributor type fuel pump, a hydraulically actuated plunger and counter-balancing spring, automatically moves the ________________ back and forth with changing engine speeds, to alter the injection timing advance.

Before removing a fuel injection pump, you must locate the engine and injection pump for timing and position so that the injecton pump can be easily reinstated in the correct position.

To locate a faulty injector on a Cummins PT injection system you should:

When servicing injectors, you should always remember to:

If a back-hoe operator sets the engine at 1500 RPM, and a small load is applied to the engine, the variable speed governor will:

Pintle type fuel injection nozzles are used with:

Caterpillar capsule type injectors are adjusted:

What engine performance measurement is found by using the following formula: Torque x RPM divided by 5252:

A port and helix fuel injection pump using plungers with upper helices would have injection timing with a:

Technician A says that a fuel system must supply the correct quantity of fuel and time the fuel delivery. Technician B says that a fuel system must control the delivery rate and distribute the fuel evenly into the cylinder. Who is correct?

On a test bench, when a technician adjusts a fuel pump so that the beginning of injection event occurs exactly the correct number of degrees apart, he is said to be ________________ the fuel pump.

An automatic timing advance mechanism varies injection timing in relation to:

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Heavy-Duty Mechanic - Trucks & Equipment