C of Q 310T Engine Prep

96. A typical maximum specified inlet restriction for an air filter on a turbocharged diesel would be?! a. 25 inches H2O restriction b. 25 inches Hg (mercury) restriction c. 25 psi d. 25 kPa

a. 25 inches H2O restriction

64. Which of the following SAE multigrade oils would likely be recommended by most highway diesel engine OEMs for year-round use in North America?! a. 5W-30 b. 15W-40 c. 20W-20 d. 20W-50

a. 5W-30

68. A full flow oil filter has become completely plugged. What is the likely outcome if the engine is running?! a. A bypass valve diverts the oil around the filter. b. Engine lubrication ceases. c. The oil pump hydraulically locks. d. The engine seizes.

a. A bypass valve diverts the oil around the filter.

45. Which tool would be required to measure the cam lift of a cylinder block-mounted camshaft in position?! a. A dial indicator b. An outside micrometer c. A depth micrometer d. Thickness gauges

a. A dial indicator

29. When observing a disassembled engine, the outer crown edges of all six pistons show signs of melting and erosion. This could be caused by?! a. Advanced timing b. A dribbling injector c. Retarded timing d. Fuel with high sulfur content

a. Advanced timing

87. Which of the following controls the drive efficiency of a thermatic, viscous drive fan hub?! a. Bimetal strip b. Viscosity of the silicone drive medium c. Fanstat d. Solenoid

a. Bimetal strip

82. If a radiator cap pressure valve fails to seal, which of the following would be the likely outcome?! a. Coolant boil-off b. Cooler operating temperatures c. Higher HC emissions d. Cavitated cylinder liners

a. Coolant boil-off

85. In a typical diesel-powered highway truck at operating temperature, which of the following should be true?! a. Coolant temperatures run cooler than lube oil temperatures. b. Coolant temperatures run warmer than lube oil temperatures. c. Coolant temperatures should be equal to lube oil temperatures.

a. Coolant temperatures run cooler than lube oil temperatures.

116. Which of the following engine brakes offers progressive step braking using from one to all six cylinders?! a. Cummins Intebrake on pre-2010 ISX b. Mercedes-Benz CTV c. Mack Trucks Jacobs on E-Tech d. Caterpillar BrakeSaver

a. Cummins Intebrake on pre-2010 ISX

122. Which of the following is the correct course of action when a WIF alert is posted to the DDU?! a. Drain the water separator sump b. Replace the fuel filters c. Replace the water separator d. All of the above

a. Drain the water separator sump

78. Which type of diesel engine coolant is regarded as potentially the most harmful to humans?! a. EG b. PG c. WEC d. ELC

a. EG

44. In which direction must a camshaft be rotated on a diesel engine with a crankshaft that is rotated clockwise?! a. Either clockwise or counterclockwise depending on the engine b. Clockwise c. Counterclockwise

a. Either clockwise or counterclockwise depending on the engine

111. The effective braking cycle on most internal engine compression brakes fitted to hydromechanical engines is actuated by using which of the following?! a. Electric over hydraulic b. Electric over pneumatic c. Pneumatic over hydraulic d. Hydraulic over electric

a. Electric over hydraulic

113. The operating principle of an internal engine compression brake is to convert the engine into an?! a. Energy-absorbing compressor b. Energy-releasing machine c. Inertia-absorbing device d. Inertia-producing device

a. Energy-absorbing compressor

21. Which of the following engine conditions would be the likely cause of a tensile failure of a connecting rod?! a. Engine overspeed b. High cylinder pressures c. Prolonged lug down d. Prolonged engine idling

a. Engine overspeed

70. Which type of oil pump is most commonly used in current highway diesel engines?! a. External gear b. Plunger c. Centrifugal d. Vane

a. External gear

28. What type of piston is favored by diesel engine OEMs in post-2007 products?! a. Forged steel trunk b. Aluminum trunk c. Two-piece articulating d. Two-piece crosshead

a. Forged steel trunk

109. Which type of engine brake uses the compression stroke of the piston as its retarding stroke?! a. Internal compression brake b. External compression brake c. Hydraulic retarder d. Volvo EPG

a. Internal compression brake

108. Which of the following best describes the function of a VG turbocharger?! a. It behaves like a large turbocharger when engine load is high. b. It behaves like a small turbocharger when engine load is high. c. It reroutes NOx back into the engine cylinders. d. It reroutes EGR gas into the DPF.

a. It behaves like a large turbocharger when engine load is high.

105. Which of the following methods would identify the location of a hole or tear in an air filter element?! a. Lightbulb test b. Air inlet restriction gauge c. Manometer test d. Regulated air pressure test

a. Lightbulb test

89. Fiberglass fans with flexible pitch blades are designed to drive air at greatest efficiency at?! a. Low speeds b. All speeds c. High speeds

a. Low speeds

36. The most commonly used piston crown design by OEMs in today's highway diesel engines is the?! a. Mexican hat b. Mann type c. Dished d. Barrel face

a. Mexican hat

50. The reason for using a pair of oppositely wound valve springs is to?! a. Minimize valve dynamic flutter b. Double the closing force of two similarly wound valves c. Increase the valve closing velocity d. Diminish valve noise

a. Minimize valve dynamic flutter

63. Once a cylinder head gasket fire ring has been torqued to its yield point, it should?! a. Not be reused after removal b. Be immediately heated to operating temperature c. Deform and no longer seal effectively

a. Not be reused after removal

58. When boiling out a cylinder block, why is it critical that all the scale in the water jacket be removed?! a. Scale is an effective insulator. b. Scale may contaminate the engine lubricant. c. Scale can accelerate coolant silicate drop-out. d. Scale causes cavitation of wet liners.

a. Scale is an effective insulator.

13. Which law states that all energy forms are convertible?! a. The first law of thermodynamics b. The second law of thermodynamics c. Boyle's law d. Charles's law

a. The first law of thermodynamics

83. Which would be the warmest portion of a typical downflow-type radiator when the engine is at operating temperature?! a. The top tank b. The surge tank c. The bottom tank d. The center of the core

a. The top tank

1. Which of the following accurately describes engine displacement?! a. Total piston swept volume b. Mean effective pressure c. Peak horsepower d. Peak torque

a. Total piston swept volume

23. Where would a Ni-Resist insert be located?! a. Upper ring belt, aluminum trunk piston b. Upper ring belt, crosshead piston c. Steel trunk piston, pin boss d. Lower ring belt, articulating piston

a. Upper ring belt, aluminum trunk piston

94. Which of the following strategies is a requirement of starting diesel engines in subzero (below −17°C) temperatures?! a. Use of an auxiliary diesel coolant heater b. Discharge a can of ether into the engine while cranking c. Avoid shutting the engine off d. All of the above

a. Use of an auxiliary diesel coolant heater

103. To produce peak manifold boost from a VN-type turbocharger, which of the following should be true?! a. Vanes are in the nearly closed position. b. Vanes are in the fully open position. c. Wastegate is fully open. d. Wastegate is fully closed.

a. Vanes are in the nearly closed position.

43. Which of the following dimensions would be consistent with a typical engine timing gear backlash setting?! a. 0.002" b. 0.008" c. 0.014" d. 0.024"

b. 0.008"

8. Ideally, where should peak cylinder pressure occur during the power stroke?! a. TDC b. 10 to 20 degrees ATDC c. 90 degrees ATDC d. At gas blowdown

b. 10 to 20 degrees ATDC

11. When running an engine at rated speed and load, which would typically be the optimum location to peak the cylinder pressure?! a. 30 degrees BTDC b. 15 degrees BTDC c. TDC d. 15 degrees ATDC

b. 15 degrees BTDC

84. The temperature rating of a thermatic viscous fan hub is a nominal 155°F (68°C). At approximately what equivalent coolant temperature will this produce minimum slip drive as temperatures rise?! a. 155°F (68°C) b. 165°F (74°C) c. 190°F (88°C) d. 225°F (107°C)

b. 165°F (74°C)

5. What percentage of the potential heat energy of the fuel does the modern diesel engine convert to kinetic energy when it is operating close to optimum efficiency?! a. 20% b. 40% c. 60% d. 80%

b. 40%

121. Which of the following solutions would provide the highest level of antifreeze protection?! a. Pure distilled water b. A 50/50 solution of EG and distilled water c. A 100% solution of PG d. A 100% solution of EG

b. A 50/50 solution of EG and distilled water

117. When a Caterpillar BrakeSaver is used, which of the following is also true?! a. External exhaust brake principles apply. b. A larger capacity engine oil sump is used. c. It must be controlled by the vehicle ECM. d. Retarding efficiency can never be modulated

b. A larger capacity engine oil sump is used.

56. Which of the following is the recommended method of pulling dry liners from a cylinder block?! a. The arc welding method b. A puller and shoe assembly c. Heat and shock cool method d. Fracture the liner in position

b. A puller and shoe assembly

74. Engine oil service classifications are standardized by which of the following organizations?! a. SAE b. API c. ASTM d. EPA

b. API

100. Which of the following best describes the function of a wastegate in a current turbo-boosted diesel engine?! a. Bleeds down intake boost air when excessively high b. Allows exhaust gas to bypass the turbine c. Adjusts the volute flow area d. Holds the exhaust valves open during low boost requirement

b. Allows exhaust gas to bypass the turbine

18. Usable power at the flywheel of an engine is known as?! a. BSFC b. Brake power c. Indicated power d. Torque

b. Brake power

62. Most current heavy duty, diesel engine cylinder blocks are manufactured from?! a. Cast aluminum alloy b. Cast iron alloys c. Composite fibers d. Compacted graphite iron (CGI)

b. Cast iron alloys

86. Which of the following properly describes the operating principle of a typical coolant pump on a highway diesel engine?! a. Positive displacement b. Centrifugal c. Constant volume d. Gear type

b. Centrifugal

119. Which of the following would best describe the color of DEF?! a. Blue b. Clear c. Amber d. Red

b. Clear

35. In what area of a Mexican hat combustion chamber are the injected droplets of fuel directed?! a. Center of the cone protrusion b. Crater c. Piston leading edge d. Upper compression ring

b. Crater

73. Which of the following correctly identifies the source of diesel engine oil?! a. Vegetable-based oil b. Crude petroleum c. Asphalt tars

b. Crude petroleum

76. Oil that has a milky, clouded appearance is probably contaminated with?! a. Fuel b. Engine coolant c. Dust d. Air

b. Engine coolant

69. Which of the following statements would usually correctly describe the relative temperatures of the coolant and lubricant when the engine is at operating temperature?! a. Coolant temperatures are higher than engine oil temperatures. b. Engine oil temperatures are higher than coolant temperatures. c. Coolant and engine oil temperatures should be equal.

b. Engine oil temperatures are higher than coolant temperatures.

110. Which type of engine brake uses the exhaust stroke of the piston as its retarding stroke?! a. Internal compression brake b. External compression brake c. Hydraulic retarder

b. External compression brake

9. Which of the seven subcircuits of the engine deals with the camshaft, valvetrains, and mechanical actuation of injectors and fuel pumping apparatus?! a. Powertrain b. Feedback assembly c. Lubrication circuit d. Engine housing circuit

b. Feedback assembly

90. Coolant silicate drop-out usually causes?! a. Scaling b. Gooey sludge c. High TDS readings

b. Gooey sludge

114. The energy of vehicle motion is ultimately converted to what energy form when an engine compression brake is used?! a. Kinetic energy b. Heat energy c. Chemical energy d. Potential energy

b. Heat energy

33. Which of the following operating modes would be more likely to result in a compressional failure of a connecting rod?! a. Prolonged low idle running b. Hydraulic lock caused by head gasket failure c. Prolonged high idle running d. Overspeeding engine

b. Hydraulic lock caused by head gasket failure

53. Which of the following cylinder block designs would be the most common in medium and heavy duty truck diesel engines?! a. Eight-cylinder, 90-degree V-configuration b. Inline six cylinder c. Six-cylinder, 60-degree V-configuration d. Inline eight cylinder

b. Inline six cylinder

99. Which of the following best describes the intended function of a C-EGR system on a diesel engine?! a. It increases engine breathing efficiency. b. It dilutes intake charge with cooled dead gas. c. It preheats the intake charge to the cylinder. d. It assists the turbocharger in boosting intake pressure.

b. It dilutes intake charge with cooled dead gas.

46. A camshaft gear is usually precisely positioned on the camshaft using a(n)?! a. Interference fit b. Key and keyway c. Captured thrust washer d. Dial indicator

b. Key and keyway

14. The energy of motion is known as?! a. Inertia b. Kinetic c. Thermal d. Potential

b. Kinetic

30. Which of the following types of pistons use bushingless pin bosses?! a. Ferrotherm b. Monotherm c. Crosshead d. Aluminum alloy

b. Monotherm

16. Which of the following statements helps explain why an engine develops peak brake power at a higher rpm than peak torque?! a. Cylinder pressures are highest. b. More power strokes per second occur. c. More time for combustion. d. Better volumetric efficiency at high rpm.

b. More power strokes per second occur.

52. What type of cam geometry is required if the objective is to load the train that rides it for most of the cycle?! a. Mostly OBC profile b. Mostly IBC profile c. Symmetrical OBC and IBC profiles

b. Mostly IBC profile

39. When crankshaft thrust surfaces are reground, which of the following would be true?! a. Undersize thrust bearings are required. b. Oversize thrust bearings are required. c. The thrust washers must be shimmed. d. The thrust washers must be machined to a smaller dimension.

b. Oversize thrust bearings are required.

15. Which of the following is required to produce peak torque in a diesel engine?! a. Peak brake power b. Peak cylinder pressure c. Peak volumetric efficiency d. Peak mechanical efficiency

b. Peak cylinder pressure

42. On a cam profile described as mostly inner base circle, the profiles between IBC and OBC are known as?! a. Cam geometry b. Ramps c. Ridges d. Heels

b. Ramp

92. What instrument do most OEMs recommend for checking the degree of antifreeze protection in heavy duty diesel engine coolants?! a. Hydrometer b. Refractometer c. Spectrographic analyzer d. Color-coded test coupon

b. Refractometer

2. Engine breathing in the two-stroke cycle is usually referred to as?! a. Inertial b. Scavenging c. Exhaust displacement

b. Scavenging

75. An auxiliary oil pump designed to feed oil to the lubrication circuit on a vehicle that operates at extreme working angles is known as a(n)?! a. Gerotor pump b. Scavenging pump c. Vane pump d. Emergency pump

b. Scavenging pump

61. When cylinder block counterbores are machined, which of the following would be required?! a. Oversize fire ring b. Shims c. Undersize liner flange d. Cylinder head resurfacing

b. Shims

88. When the thermostat routes the coolant through the bypass circuit, what is happening?! a. The coolant is cycled primarily through the radiator. b. The coolant is cycled primarily through the engine. c. The coolant is cycled primarily through auxiliary heat exchangers.

b. The coolant is cycled primarily through the engine.

31. What would be the consequence of a misdirected piston oil cooling jet?! a. Fuel in lube b. Torched piston c. Low oil pressure d. Overheated engine lube

b. Torched piston

101. When series turbocharging is used on a current diesel engine, which of the following should be true?! a. A single CG turbocharger is used. b. Twin turbos are arranged in series. c. The VG actuator is in series with the EGR mixer. d. Twin turbos are arranged in parallel.

b. Twin turbos are arranged in series.

71. Which of the following is usually the preferred OEM method of testing an oil cooler bundle?! a. Pressure test using shop air and a bucket of water b. Vacuum test c. Die penetrant test

b. Vacuum test

106. When is a diesel engine turbocharger capable of highest rotational speeds?! a. At peak engine rpm b. When rejected heat is greatest c. At peak torque d. When exhaust manifold pressure is greatest

b. When rejected heat is greatest

4. When a modern diesel engine is running at optimum efficiency, the percentage of rejected heat would typically be?! a. 20% b. 40% c. 60% d. 80%

c. 60%

25. A crankshaft has a fracture failure that appears to have initiated at a throw journal oil hole. Which of the following would be the more likely cause?! a. A broken main cap b. Excessive cylinder pressure c. A failed vibration damper d. A spun rod bearing

c. A failed vibration damper

32. What should be used to install piston rings onto a piston?! a. The thumb and index finger b. A ring contractor c. A ring expander d. Snapring pliers

c. A ring expander

91. In the event of an engine overheating, where is the coolant likely to boil first?! a. At the engine water jacket b. At the top of the radiator tank c. At the inlet to the coolant pump d. At the thermostat housing

c. At the inlet to the coolant pump

60. When cavitation damage is evident on a set of wet liners, which of the following is more likely to be responsible?! a. Lubrication breakdown b. High cylinder pressures c. Coolant breakdown d. Cold engine operation

c. Coolant breakdown

34. Which of the following would be the more likely outcome of running an engine with a failed vibration damper?! a. Increased fuel consumption b. Increased cylinder blowby c. Crankshaft failure d. Camshaft failure

c. Crankshaft failure

97. Which of the following types of filters has the highest filtering efficiencies?! a. Centrifugal precleaners b. Oil bath c. Dry, positive

c. Dry, positive

48. Which of the following operating conditions would be more likely to cause a valve float condition?! a. Engine lug down b. Operating in the torque rise profile c. Engine overspeed d. Operating in the droop curve

c. Engine overspeed

51. Which of the following methods is used to transfer drive from the crankshaft to the camshaft on most commercial diesel engines?! a. Belt and pulley b. Timing chain and sprocket c. Gears d. Fluid coupling

c. Gears

41. The location on a cam profile that is exactly opposite the toe is referred to as the?! a. Nose b. Ramp c. Heel d. Sole

c. Heel

24. Under which of the following conditions would a piston ring seal more effectively?! a. High engine temperatures b. Low engine temperatures c. High cylinder pressures d. Low cylinder pressures

c. High cylinder pressures

3. The tendency of an object in motion to want to stay in motion is known as?! a. Kinetic energy b. Dynamic friction c. Inertia d. Mechanical force

c. Inertia

17. Which of the following is true of an engine described as having high torque rise when comparing it with its standard version with the same nominal rated power?! a. It will produce higher brake power. b. It will have a higher maximum speed. c. It will provide a wider operating rpm range. d. It will be more fuel efficient.

c. It will provide a wider operating rpm range.

12. At which point in the engine cycle does the crank throw leverage peak?! a. TDC b. Around 15 degrees ATDC c. Just before 90 degrees ATDC d. BTDC

c. Just before 90 degrees ATDC

104. The constant geometry turbocharger used in a current highway diesel engine with turbo-compounding is designed to produce optimum efficiency at which rpm?! a. Rated speed and load b. Top engine limit (TEL) c. Peak torque d. High idle

c. Peak torque

27. Rod and main journal bearing clearances are properly measured with?! a. Tram gauges b. Dial indicators c. Plastigage d. Snap gauges

c. Plastigage

6. In which of the four strokes of the cycle is the cylinder pressure at its highest in a running diesel engine?! a. Intake b. Compression c. Power d. Exhaust

c. Power

79. Which of the following cooling media would transfer heat most efficiently?! a. EG b. PG c. Pure water d. ELC

c. Pure water

77. Which of the following statements best describes viscosity?! a. Resistance to temperature b. Lubricity c. Resistance to flow d. Breakdown resistance

c. Resistance to flow

102. What is the critical flow area managed by a VG turbo using a variable nozzle operating principle?! a. Compressor diffuser b. Impeller inlet throat c. Turbine volute d. EGR gate

c. Turbine volute

7. Where does scavenging take place on a four-stroke cycle diesel engine?! a. BDC after the power stroke b. TDC after the compression stroke c. Valve overlap d. 10 to 20 degrees ATDC on the power stroke

c. Valve overlap

95. The tool of choice to accurately check the inlet restriction of a dry air filter would be a?! a. Mercury-filled manometer b. Trouble light c. Water-filled manometer d. Restriction gauge

c. Water-filled manometer

10. When running an engine at idle speed, which would typically be the optimum location to peak the cylinder pressure?! a. 20 degrees BTDC b. 10 degrees BTDC c. TDC d. 15 degrees ATDC

d. 15 degrees ATDC

81. The cooling system hoses on an engine collapse when the unit is left parked overnight. Which of the following is the likely cause?! a. This is normal. b. A defective thermostat. c. Improper coolant. d. A defective radiator cap.

d. A defective radiator cap.

118. Which of the following engine lubricants must be used if an engine is equipped with a DPF?! a. Any synthetic lubricant b. Any biodiesel lubricant c. API CI-4 d. API CJ-4

d. API CJ-4

72. When interpreting a used engine oil analysis profile, which of the following conditions would be most likely to cause high silicon levels?! a. Oil cooler bundle disintegration b. Plugged air cleaner c. Turbocharger bearing failure d. Air cleaner perforation

d. Air cleaner perforation

98. Which of the following should be performed first when checking an engine that produces black smoke under load?! a. Injection timing b. Plugged DPF c. Fuel quality by chemical lab analysis d. Air filter restriction test

d. Air filter restriction test

66. Which of the following conditions could result from a high crankcase oil level?! a. Lube oil aeration b. Oil pressure gauge fluctuations c. Friction bearing damage d. All of the above

d. All of the above

93. Which of the following is true of an APCS?! a. Coolant boil temperature is raised. b. Cooling system pressure is raised by compressed air. c. Helps the cooling system function with higher heat loads. d. All of the above.

d. All of the above.

107. Which of the following components would be located in a diesel exhaust gas aftertreatment canister?! a. DPF b. SCR c. Oxidation converter d. Any or all of the above

d. Any or all of the above

112. When will any kind of engine brake usually operate at peak efficiency?! a. At idle rpm b. At peak torque rpm c. At rated speed rpm d. At the highest rpm

d. At the highest rpm

120. What color is used to denote a DEF fill cap?! a. White b. Green c. Red d. Blue

d. Blue

65. Which of the following API classifications indicates that the oil is formulated for diesel engines meeting 2010 emissions standards?! a. GF b. CC c. CI-4 d. CJ-4

d. CJ-4

54. The main reason for bench pressure testing a diesel engine cylinder head is to?! a. Test cylinder gas leakage b. Check for air leaks c. Check for exhaust leaks d. Check for coolant leaks

d. Check for coolant leaks

67. When investigating a low oil pressure complaint, which of the following should be performed first?! a. Perform a rod and main bearing rollover. b. Install a master gauge to verify the complaints. c. Test the oil for fuel contamination. d. Check the crankcase oil level.

d. Check the crankcase oil level.

37. Which term is used to describe the cylinder volume between the piston upper compression ring and its leading edge?! a. Dead volume b. Headland volume c. Toroidal recess d. Clearance volume

d. Clearance volume

115. When an internal engine compression brake is actuated, where does gas blowdown occur?! a. At valve overlap b. Close to BDC following the power stroke c. At the beginning of the exhaust stroke d. Close to TDC at the completion of the compression stroke

d. Close to TDC at the completion of the compression stroke

22. Which of the following is a disadvantage of an articulating piston assembly when comparing it to an aluminum alloy trunk piston?! a. Piston slap control b. Highest possible location of an upper ring groove c. Service life d. Increased tensile loading on the connecting rods

d. Increased tensile loading on the connecting rods

19. When engine power is calculated rather than tested, it is known as?! a. Mean effective pressure b. BSFC c. Brake power d. Indicated power

d. Indicated power

26. Which of the following journal surface hardening methods would provide the highest machinability margin?! a. Flame hardening b. Nitriding c. Shot peening d. Induction hardening

d. Induction hardening

49. When grinding a new set of cylinder valve seats, which of the following should be performed before the machining?! a. Install the valves. b. Install the rockers. c. Adjust the valve yokes. d. Install the valve guides.

d. Install the valve guides

40. Excessive clearance at the crankshaft main bearings could result in which of the following conditions?! a. Aerated oil b. Fluctuating oil pressures c. High oil pressure d. Low oil pressure

d. Low oil pressure

47. When grinding a valve face to remove pitting, the critical specification to monitor during machining would be the?! a. Shank diameter b. Stem c. Poppet diameter d. Margin

d. Margin

57. Which of the following tools is recommended for checking cylinder block line bore?! a. Straightedge and thickness gauges b. Dial bore gauge c. Dial indicator d. Master line bore bar

d. Master line bore bar

20. When comparing truck engine brake power measured at the flywheel to that measured at the drive wheels, which one of the following should be true about brake power?! a. There is no difference if the transmission and drive carrier are functioning properly. b. Power at the wheels exceeds that at the flywheel by 10% to 25%. c. Power can only be measured at the drive wheels. d. Power at the flywheel exceeds that at the drive wheels by 20% to 25%.

d. Power at the flywheel exceeds that at the drive wheels by 20% to 25%

59. Which of the following tools should be used to check a cylinder head for warpage?! a. Master bar b. Dial indicator c. Laser d. Straightedge and thickness gauges

d. Straightedge and thickness gauges

55. When selective fitting a set of dry liners to a cylinder block, which of the following statements should be true?! a. The liner with the largest od is fitted to the bore with the largest id. b. The liners are installed with an interference fit. c. The liner with the smallest od is fitted to the bore with the largest id. d. The liners are installed with a fractionally loose fit.

d. The liners are installed with a fractionally loose fit.

38. Which of the following is true of a CFA piston?! a. The ring belt reinforcement insert extends up into the leading edge of the piston. b. It is a type of Ni-Resist insert. c. It is used only on articulating pistons. d. The ring belt operates at higher temperatures.

d. The ring belt operates at higher temperatures.

80. Wet liner cavitation is caused by?! a. Aerated coolant b. Combustion gas leakage c. Air in the radiator d. Vapor bubble collapse

d. Vapor bubble collapse

123. When should a diesel engine air filter be changed?! a. At every engine wet service b. Every time the oil filter is changed c. Every six months d. When the restriction gauge indicates it is beginning to plug

d. When the restriction gauge indicates it is beginning to plug