The distillation end point is the temperature at which fuel is completely vaporized. A fuel with too high a distillation end point, say over 675 F may cause:
Technician A says that secondary fuel filters are usually in the range of 5-7 microns. Technician B says that primary fuel filters are usually in the range of 20-25 microns. Who is correct?
Technician A says that the primary fuel filter is usually on the suction side of the transfer pump. Technician B says that the secondary fuel filter is usually on the auction side of the transfer pump. Who is correct?
Technician A says that a fuel system must apply 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 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?
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:
The term hydraulic governor refers to a governor in which the:
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:
How will a diesel engine perform when operated in the summer time, on a fuel with a high cetane rating?
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 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 the system''s injector line pressure for a rapid rise and fall of injection pressures?
What controls the maximum pressure in a high pressure injector fuel line?
An in-line fuel injection pump using port and helix plungers with upper helices, would have injection timing with a:
On a test bench, when a technician adjusts a fuel pump so that the beginning of the injection event occurs exactly at the correct number of degrees apart, he is said to be __________________ the fuel pump.
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:
An automatic timing advance mechanism varies injection timing in relation to:
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?
An injection nozzle that has one main spray hole and an extra hole that directs its spray at the hottest part of the combustion chamber is known as a _________________nozzle.
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 in an in-line injection pump, and were to be moved all the way up, the fuel pump would be in the ___________position.
If the same device mentioned in the second previous question were to be moved all the way down, the fuel pump would be in the _____________ position.
A device used to control excessive smoke during rapid acceleration caused by turbo lag is known as a(n)
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?
What operational problem would occur if a governor flyweight spring were to break?
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 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 both Bosch and Detroit fuel systems use a mechanical type injector. Technician B says that both Bosch and Detroit fuel systems use a port and helix system. Who is correct?
Which of the following systems would control the volume for fuel injection by modifying and controlling pressures within the low pressure supply system relative to engine rpm?
For the greater part of the camshaft rotation a Cummins PT injector plunger is:
The primary fuel filter on an engine is on the _____________ side of the fuel pump.
The fuel is shut off to the Cummins engine by:
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 Cummins engine may be timed by adding or subtracting shims or gaskets from under the cam follower housing covers. Who is correct?
Technician A says that a Cummins STC injector employs a hydraulic lifter on the top of the injector plunger. Technician B says that a Cummins PTD top-stop injector has a pre-determined maximum travel adjusted into it when assembled. Who is correct?
On some distributor type fuel systems, timing may be adjusted by:
The metering valve in an opposed plunger distributor type fuel pump controls the amount of __________________ within the pumping element prior to injection.
In the opposed plunger type fuel pump, the cam ring and plungers produce ________________sent to the injectors.
The governor on an opposed plunger distributor type fuel system controls the:
In an opposed plunger distributor type fuel pump, a hydraulically actuated spool and counter-balancing spring, automatically moves the _______________ back and forth with changing engine speeds, to alter the injection timing advance.
Pre-combustion chambers may have a glow plug to:
Before removing a fuel injection pump, you must locate the engine and injection pump for timing and position so that the injection pump can be easily reinstated in the correct position.
An excessive air leakage beyond the turbo will affect
To locate a faulty injector on a Cummins PT injection system you should
When servicing injectors, you should always remember to
One advantage to a unit injection system is
Some diesel engines have the fuel inlet and return lines cast as part of the cylinder head, while others have separate lines for inlet and return.
When you install a new or reconditioned plunger supply pump on an engine with a diesel injection system you must make sure that:
To determine if the fuel transfer pump for an injection system is operating efficiently you must test for
To ensure smooth injector plunger movement in the unit injector system you should always check
Once a valve bridge has been adjusted, it can be placed in any position on the engine.
Injector timing on the Detroit unit injector system is considered to be correct when
An aneroid is used to help reduce white smoke on diesel engines.
Which of the following may cause a low power complaint?
Technician A says that a fuel shutoff solenoid may have dual acting coils in one housing. Technician B says that one coil pulls the fuel shutoff to the "open" position. Who is right?
A distributor type pump uses a ___________________ to control the delivery rate.
Pintle type fuel injection nozzles are used with:
In a Cummins or Detroit engine using a unit injector, how would you check for an engine miss?
In an diaphragm type fuel transfer pump, the maximum possible pressure output would be limited by:
A mechanical governor operated on the principle of:
A seized injection pumping unit on an inline injection pump will cause:
Caterpillar capsule type injectors are adjusted for cracking pressure:
A fuel transfer pump:
To check which cylinder is missing on an engine equipped with an inline injection pump and nozzles in the cylinder head, you would:
Often the best volumetric efficiency of an engine is at the RPM where it develops peak torque.
Placing shims between the engine block and the _________________, will alter the timing on a 855 cu. in. Cummins six cylinder engine.
The most common type of combustion chamber used in engines today is the:
The lbs. of fuel consumed per brake horsepower per hour that is used by an engine, is known as:
The difference in torque at governed RPM and torque expressed as a percentage is known as:
What engine performance measurement is found by using the following formula; Torque x RPM divided by 5252
As compared to a direct injection chamber, an engine equipped with pre-combustion chambers will:
A cold engine will often have excessive exhaust smoke.
A technician finds that a diesel engine will not start. It turns over fine and there is no smoke coming from the exhaust pipe and it refuses to start. All may be the problem except:
Fuel in the oil on a Cummins engine may be caused by faulty injector o-rings.
An injector failure can occur because of:
The fuel/water separator filter or sight glass should be drained:
Excessive cylinder temperature are the major cause of ________________ formation.
Fuel heaters should be thermostatically controlled because:
Open combustion chamber designs:
The factor(s) that affect the ignition delay period are:
Starting fluid should not be used in combination with engines which have:
Contaminated or dirty fuel may cause:
Diesel fuel is rated by its:
Diesel fuel conditioner will dissolve ice in the fuel tank:
Using winter fuel in the summer time may cause:
Using summer fuel in the winter time may cause:
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