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OTC - Diesel Engines I DET-101 > Week #6 - Diagnosis, Testing Engines and Engine Brakes > Flashcards

Week #6 - Diagnosis, Testing Engines and Engine Brakes Flashcards

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1
Q

Which type of engine brake uses the exhaust stroke of the piston as its retarding stroke?

a. External compression brake
b. Hydraulic retarder
c. Internal compression brake

A

a. External compression brake

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2
Q

True or False: B10 life is used by some fleets to determine how long they should keep trucks before selling them.

A

True

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3
Q

True or False: The letter B in the term B-life references predicted veering longevity.

A

True

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4
Q

True or False: A failed camshaft can result in low cylinder compression.

A

True

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5
Q

You have determined that a set of EUIs has failed due to cavitation. Which of the following would be the more likely ‘root cause’ of the failure?

a. Prolonged high-load operation
b. Restricted secondary filter
c. Double-gasketing the EUI seat
d. Incorrect injector timing setting

A

b. Restricted secondary filter

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6
Q

When observing a disassembled engine, you see that the outer edges of all the pistons have evidence of melting and erosion, this would most likely be caused by:

a. a dribblingg injector
b. advanced timing
c. high sulfur content fuel
d. retarded timing

A

b. advanced timing

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7
Q

Which of the following conditions could cause carbon buildup on piston?

a. Injector nozzle failure
b. Retarded injection timing
c. Overfueling
d. All of the above

A

d. All of the above

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8
Q

Which of the following is the correct technical description of what we call ‘scuffing’?

a. Adhesive failure
b. Scraping
c. Catastrophic
d. Thermal failure

A

a. Adhesive failure

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9
Q

What doe Bosch research indicate to be the major cause of EHI failures?

A

Valve seat failure

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10
Q

The energy of vehicle motion is ultimately converted to what energy form when an engine compression brake is used?

a. Heat energy
b. Chemical energy
c. Potential energy
d. Kinetic energy

A

a. Heat energy

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11
Q

True or False: An engine that stalls at periodic intervals can be the result of fuel starvation.

A

True

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12
Q

True or False: When a diesel engine is run for prolonged periods at rated speed and load, turbocharger bearings can be destroyed.

A

False

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13
Q

True or False: The force used to actuate the hydraulic circuit in a typical Jacobs brake is delivered by an electrically actuated solenoid.

A

False

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14
Q

Which of the following components, when worn, may cause lower oil pressures?

a. Oil control rings
b. Main bearings
c. Valve guides
d. All of the above

A

b. Main bearings

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15
Q

Which of the following engine brakes offers progressive step braking using from one to all six cylinders?

a. Flywheel hydraulic retarders
b. Mach Trucks Jacobs on E-Tech
c. Mercedes-Benz CTV
d. Cummins Intebrake on pre-2010 ISX

A

d. Cummins Integrake on pre-2010 ISX

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16
Q

A typical maximum inlet restriction specification on a turbo-boosted diesel engine would be:

a. 25-inch (635-mm) Hg
b. 25 psi (172 kPa)
c. 25-inch (635-mm) H2O
d. 250 kPa (36 psi)

A

c. 25-inch (635-mm) H2O

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17
Q

True or False: Jacobs brake solenoids act as a pilot switch to control oil flow to the hydraulic actuation circuit.

A

True

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18
Q

True or False: On most internal engine compression brakes, the effective braking stroke of the piston is the compression stroke.

A

True

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19
Q

True or False: The Cummins Intebrake on post-2010 ISX functions as both internal and external engine compression brake.

A

True

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20
Q

True or False: Incorrect valve lash can cause low cylinder compression.

A

True

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21
Q

Which of the following instruments would check dry air filter restriction with the highest accuracy?

a. H2O manometer
b. Trouble light
c. Dash restriction gauge
d. Pyrometer

A

a. H2O manometer

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22
Q

When examining a set of pistons from a disassembled engine, you observe scuffing on the thrust sides of all the pistons. Which of the following would be the more likely cause?

a. Overheating
b. High sulfur content fuel
c. Contaminated engine lube
d. High cylinder pressures

A

d. High cylinder pressures

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23
Q

True or False: A small dent in a viscous-type vibration damper is not a concern unless there is visible leakage.

A

False

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24
Q

Evidence of cavitation erosion on a set of wet liners would most likely be caused by:

a. incorrect coolant chemistry
b. piston spalling
c. liner O-ring failure
d. high cylinder pressures

A

a. incorrect coolant chemistry

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25
Q

True or False: Excessive idling in cold weather can result in fuel contamination of engine lube.

A

True

26
Q

Etched main bearings could be caused

a. sulfur in lube
b. particulate in lube oil
c. coolant in lube
d. fuel in lube

A

b. particulate in lube oil

27
Q

When will any kind of engine brake usually operate at peak efficiency?

a. At peak torque rpm
b. At idle rpm
c. At the highest rpm
d. At rated speed rpm

A

c. At the highest rpm

28
Q

High crankcase oil level can produce low or fluctuating oil pressure readings.

A

True

29
Q

True or False: Bx life is a prediction of engine life before major repair.

A

True

30
Q

True or False: On some engine brake systems both the compression and exhaust strokes can deliver retarding force.

A

True

31
Q

True or False: B-life is used as a means of reckoning costs over the life of an engine.

A

True

32
Q

True or False: Excessive idling can result in plugging of the EGR heat exchanger.

A

True

33
Q

Which of the following might result in glazed cylinder sleeves?

a. Ether usage
b. Engine lugging
c. High cylinder pressures
d. Prolonged engine idling

A

d. Prolonged engine idling

34
Q

True or False: An aluminum trunk-type piston has failed with a hole burned through the center of the crown. This might be due to a retarded timing condition.

A

True

35
Q

Which of the following conditions would be least likely to cause black smoke emission?

a. Excessive use of Cetane improver
b. Restricted air filter
c. Retarded injection timing
d. Restricted diesel particulate filter

A

a. Excessive use of Cetane improver

36
Q

The effective braking cycle on most internal engine compression brakes fitted to hydromechanical engines is actuated by using which of the following sequences?

a. Electric-over-pneumatic
b. Electric-over-hydraulic
c. Hydraulic-over-electric
d. Pneumatic-over-hydraulic

A

Electric-over-hydraulic

37
Q

What vehicle technology enable nonengine controllers to request engine braking cycles

A

Multiplexing

38
Q

True or False: An excessive amount of oil in the crankcase can produce a low oil pressure problem in a diesel engine.

A

True

39
Q

True or False: Some compressors have to be timed to the engine or a vibration will result.

A

True

40
Q

True or False: The first thing that should be done when troubleshooting an engine miss is to connect an EST and check for logged codes.

A

True

41
Q

True or False: A blown exhaust manifold gasket can result in fuel contamination of engine lube.

A

False

42
Q

When an EHI failure is attributed to contaminated fuel, which of the following is required to avoid a repeat failure?

a. Locate the source of the contaminated fuel.
b. Drain the fuel tanks and refill
c. Add tow cans of diesel fuel conditioner to the tanks
d. Replace all six injectors in the engine

A

a. Locate the source of the contaminated fuel

43
Q

True or False: An engine can stall when operated with a fuel with a high CN value.

A

False

44
Q

True or False: The first thing to check when oil pressures fluctuate is the crankcase oil level.

A

True

45
Q

True or False: Low oil pressure can cause some types of EGR gate valves to stick.

A

True

46
Q

Which type of engine brake uses the compression stroke of the piston as its retarding stroke?

a. Volvo EPG
b. Hydraulic retarder
c. External compression brake
d. Internal compression brake

A

d. Internal compression brake

47
Q

Which of the following operating modes would be most likely to result in a tensile conn rod failure?

a. Ether abuse
b. Overfueling
c. An overspeeding engine
d. Lugdown

A

c. An overspeeding engine

48
Q

There is evidence of soot in the intake manifold of a boosted truck diesel engine. Which of the following conditions would be most likely to contribute to this condition?

a. Running at low speed with low loads
b. Engine lugdown
c. Rated speed operation
d. High-idle operation

A

a. Running at low speed with low loads

49
Q

True or False: A fuel-in-oil condition can be recognized because the lube oil turns a chocolate-milk color.

A

False

50
Q

True or False: White smoke emission can be caused by air starvation to the engine.

A

False

51
Q

True or False: Hot shutdown of a diesel engine can destroy turbocharger bearings.

A

True

52
Q

When an internal engine compression brake is actuated, where does the gas blowdown occur?

A

Close to TDC at the completion of the compression stroke

53
Q

What is the most common cause of EUI failure?

A

Internal leakage

54
Q

True or False: Blue smoke is associated with an engine that is burning oil in its cylinders.

A

True

55
Q

Operating an engine without a coolant thermostat would most likely result in an increase of which noxious emission?

A

HC

56
Q

Which of the following conditions is the more likely result of advanced timing in a diesel engine?
a. Erosion pitting above the top compression ring land
b. Overall piston scuffing
c. Fractured rings
Erosion near the center of the piston crown

A

a. Erosion pitting above the top compression ring land

57
Q

True or False: An aluminum trunk-type piston has failed with a hole burned through the center of the crown. Such a failure could occur caused by a dribbling injector nozzle.

A

True

58
Q

Which of the following should be done first when investigating a complaint of poor fuel mileage?

a. Connect an EST and check for codes
b. Run a lab test on the fuel
c. Change the air filter
d. Overhaul the engine

A

a. Connect an EST and check for codes

59
Q

True or False: The Cummins Intebrake on pre-2010 ISX is capable of optioning engine braking on just one engine cylinder.

A

True

60
Q

True or False: The first thing that should be done when troubleshooting an engine miss is to perform an overhead adjustment (valves and injectors).

A

False

61
Q

The operating principal of an internal engine compression brake is convert the engine into an:

a. energy-releasing machine
b. energy-absorbing compressor
c. inertia-producing device
d. inertia-absorbing device

A

b. energy-absorbing compressor

OTC - Diesel Engines I DET-101 (6 decks)

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