Chapter 32 Camshafts and Valve Trains
Quiz by Matt Lobdell
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- Q1
The camshaft makes ________ for every revolution of the crankshaft.
one quarter revolution
two revolutions
one revolution
one half revolution
30s - Q2
A DOHC V-6 has how many camshafts?
1
4
3
2
30s - Q3
Which timing chain type is also called a" silent chain"?
Roller
Morse
Flat link
Both B and C
30s - Q4
Many technicians always use new push rods because ________.
they wear at both ends
pushrods shrink in length if removed from an engine
they are less expensive to buy than clean
all dirt cannot be cleaned out from the hollow center
30s - Q5
Hydraulic valve lifters can make a ticking noise when the engine is running if ________.
valve lash is too close
valve lash is too loose
lobe centerline is over 110°
Both A and C
30s - Q6
Hydraulic lifters or hydraulic lash adjusters (HLA) may not bleed down properly and could cause an engine miss if________.
the engine oil is 1 quart low
the wrong API-rated engine oil is used
the wrong SAE-rated engine oil is used
Both A and B
30s - Q7
If lift and duration remain constant and the lobe center angle decreases, then ________.
the effective duration increases
the valve overlap decreases
the valve overlap increases
the effective lift increases
30s - Q8
The intake valve opens at 39° BTDC(before top dead center) and closes at 71° ABDC (After bottom dead center). The exhaust valve opens at 78° BBDC (before bottom dead center) and closes at 47°ATDC (after top dead center). Which of these is correct regarding this cam timing?
Intake valve duration is 110°
Exhaust valve duration is 125°
Overlap is 88°
Both A and B
30s - Q9
The maximum total indicator runout (TIR)of a camshaft should be less than ________.
0.004 in
0.006 in
0.002 in
0.008in
30s - Q10
Two technicians are discussing variable valve timing. Technician A says that changing the exhaust valve timing helps reduce exhaust emissions. Technician B says that changing the intake valve timing helps increase low-speed torque. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q11
Technician A says that the push rods should be rotating while the engine is running if the camshaft and lifters are okay. Technician B says that the camshaft rotates at one-quarter the crankshaft speed. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q12
Technician A says that silent chains are quieter than roller chains and do not stretch with use. Technician B says that on overhead valve engines, the camshaft is usually placed in the block above the crankshaft. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q13
Flat-bottom valve lifters rotate during operation because of the ________ of the camshaft.
thrust plate
taper of the lobe
chain tensioner
bearings
30s - Q14
Which term is used to describe the number of degrees of crankshaft rotation for which the valve is lifted off the seat?
Duration
Underlap
Overlap
Lift
30s - Q15
Technician A says that valve overlap is the number of crankshaft degrees that both valves are closed. Technician B says that valve overlap is the number of degrees that both valves are open. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s