Question 1

When performing a valve lash adjustment on a diesel engine, which of the following is recommended?

Accepted Answer

A)  engine stationary and at operating temperature 
B)  engine running and at operating temperature 
C)  engine stationary and cold 
D)  engine running and cold 
A)  engine stationary and at operating temperature 
B)  engine running and at operating temperature 
C)  engine stationary and cold 
D)  engine running and cold

Question 2

Which of the following is another way of describing valve keepers?

Accepted Answer

A)  margins 
B)  split locks 
C)  fillet radius 
D)  headers 
A)  margins 
B)  split locks 
C)  fillet radius 
D)  headers

Question 3

What is commonly used to position a camshaft gear on a camshaft?

Accepted Answer

A)  key and keyway 
B)  loctite 
C)  interference fit 
D)  staking 
A)  key and keyway 
B)  loctite 
C)  interference fit 
D)  staking

Question 4

A four-stroke cycle diesel engine has a crankshaft gear with 45 teeth. How many teeth should the camshaft gear have if it is direct-driven?

Accepted Answer

A)  22 
B)  45 
C)  90 
D)  180 
A)  22 
B)  45 
C)  90 
D)  180

Question 5

When testing valve spring tension, within what percentage of the original tension specification should the measurement be?

Accepted Answer

A)  5 percent 
B)  10 percent 
C)  15 percent 
D)  20 percent 
A)  5 percent 
B)  10 percent 
C)  15 percent 
D)  20 percent

Question 6

Which of the following is NOT found in medium and heavy duty truck diesel engines?

Accepted Answer

A)  cast iron solid lifters 
B)  middle alloy steel solid lifters 
C)  roller type cam followers 
D)  hydraulic lifters 
A)  cast iron solid lifters 
B)  middle alloy steel solid lifters 
C)  roller type cam followers 
D)  hydraulic lifters

Question 7

What should be used to check an out-of-engine camshaft for bend?

Accepted Answer

A)  inside micrometer 
B)  outside micrometer 
C)  dial bore gauge 
D)  dial indicator and V-blocks 
A)  inside micrometer 
B)  outside micrometer 
C)  dial bore gauge 
D)  dial indicator and V-blocks

Question 8

Which of the following would provide higher valve seating force?

Accepted Answer

A)  30 degree cut valve 
B)  45 degree cut valve 
C)  solid lifter valve trains 
D)  roller type cam followers 
A)  30 degree cut valve 
B)  45 degree cut valve 
C)  solid lifter valve trains 
D)  roller type cam followers

Question 9

When timing the overhead camshafts used on a pre-2010 Cummins ISX engine geartrain, which of the following tools must be used?

Accepted Answer

A)  dial indicator 
B)  timing wedges 
C)  Plastigagetm 
D)  calibration indices 
A)  dial indicator 
B)  timing wedges 
C)  Plastigagetm 
D)  calibration indices

Question 10

Which of the following is the odd one out?

Accepted Answer

A)  tappets 
B)  lifters 
C)  push tubes 
D)  followers 
A)  tappets 
B)  lifters 
C)  push tubes 
D)  followers

Question 11

What is the reason most manufacturers suggest that a valve bridge be removed from the engine before backing off the adjusting screw?

Accepted Answer

A)  adjusting screw is easily damaged 
B)  bridge may be deformed 
C)  bridge guide is easily bent 
D)  rocker may be damaged 
A)  adjusting screw is easily damaged 
B)  bridge may be deformed 
C)  bridge guide is easily bent 
D)  rocker may be damaged

Question 12

Valve setting specifications are provided by the OEM for performing overhead adjustment when engine temperature is:

Accepted Answer

A)  at operating temperature 
B)  above 150 degrees Fahrenheit 
C)  120 degrees Fahrenheit 
D)  below 100 degrees Fahrenheit 
A)  at operating temperature 
B)  above 150 degrees Fahrenheit 
C)  120 degrees Fahrenheit 
D)  below 100 degrees Fahrenheit

Question 13

What is the recommended tool used to check valve lash dimension?

Accepted Answer

A)  thickness gauges 
B)  dial indicator 
C)  inside micrometer 
D)  snap gauge 
A)  thickness gauges 
B)  dial indicator 
C)  inside micrometer 
D)  snap gauge

Question 14

What is the reason that OEMs specify greater valve lash for exhaust valves?

Accepted Answer

A)  they run hotter and expand more 
B)  they run cooler and contract less 
C)  they are shorter than intake valves 
D)  they are longer than intake valves 
A)  they run hotter and expand more 
B)  they run cooler and contract less 
C)  they are shorter than intake valves 
D)  they are longer than intake valves

Question 15

Which of the following could be used to measure cam bushing bore in a cylinder block?

Accepted Answer

A)  deck micrometer 
B)  outside micrometer 
C)  dial bore gauge 
D)  Plastigagetm 
A)  deck micrometer 
B)  outside micrometer 
C)  dial bore gauge 
D)  Plastigagetm

Question 16

When a valve interference angle is used, which of the following would be a typical specification?

Accepted Answer

A)  one degree 
B)  two degrees 
C)  five degrees 
D)  ten degrees 
A)  one degree 
B)  two degrees 
C)  five degrees 
D)  ten degrees

Question 17

Which of the following operates at the highest temperatures?

Accepted Answer

A)  exhaust valves 
B)  intake valves 
C)  solid lifters 
D)  rockers 
A)  exhaust valves 
B)  intake valves 
C)  solid lifters 
D)  rockers

Question 18

When is valve float more likely to occur?

Accepted Answer

A)  high engine speeds 
B)  low engine speeds 
C)  engine rated speeds 
D)  engine lugdown 
A)  high engine speeds 
B)  low engine speeds 
C)  engine rated speeds 
D)  engine lugdown

Question 19

To what temperature should a camshaft gear usually be heated prior to installation on a camshaft?

Accepted Answer

A)  100 degrees Fahrenheit 
B)  200 degrees Fahrenheit 
C)  300 degrees Fahrenheit 
D)  400 degrees Fahrenheit 
A)  100 degrees Fahrenheit 
B)  200 degrees Fahrenheit 
C)  300 degrees Fahrenheit 
D)  400 degrees Fahrenheit

Question 20

What is used to define camshaft endplay?

Accepted Answer

A)  captured thrust springs 
B)  free thrust washers 
C)  either free or captured thrust washers 
D)  nothing 
A)  captured thrust springs 
B)  free thrust washers 
C)  either free or captured thrust washers 
D)  nothing

Exam 8: Engine Feedback Assembly

When performing a valve lash adjustment on a diesel engine, which of the following is recommended?

Which of the following is another way of describing valve keepers?

What is commonly used to position a camshaft gear on a camshaft?

A four-stroke cycle diesel engine has a crankshaft gear with 45 teeth. How many teeth should the camshaft gear have if it is direct-driven?

When testing valve spring tension, within what percentage of the original tension specification should the measurement be?

Which of the following is NOT found in medium and heavy duty truck diesel engines?

What should be used to check an out-of-engine camshaft for bend?

Which of the following would provide higher valve seating force?

When timing the overhead camshafts used on a pre-2010 Cummins ISX engine geartrain, which of the following tools must be used?

Which of the following is the odd one out?

What is the reason most manufacturers suggest that a valve bridge be removed from the engine before backing off the adjusting screw?

Valve setting specifications are provided by the OEM for performing overhead adjustment when engine temperature is:

What is the recommended tool used to check valve lash dimension?

What is the reason that OEMs specify greater valve lash for exhaust valves?

Which of the following could be used to measure cam bushing bore in a cylinder block?

When a valve interference angle is used, which of the following would be a typical specification?

Which of the following operates at the highest temperatures?

When is valve float more likely to occur?

To what temperature should a camshaft gear usually be heated prior to installation on a camshaft?

What is used to define camshaft endplay?

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