Chapter 30 Cylinder Head and Valve Guide Service
Quiz by Matt Lobdell
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- Q1
Cylinder heads with four valves flow more air than those with two valves because they ________.
increase the velocity of the air
use a higher lift camshaft
have a greater open area
Both A and C
30s - Q2
Two technicians are discussing a Hemi engine. Technician A says that a Hemi is an engine with a hemi-spherical shaped combustion chamber. Technician B says that all Hemi engines are cam-in-block designs. Which technician is correct?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q3
Technician A says that an Audi five-valve engine uses three intake valves and two exhaust valves. Technician B says that it uses three exhaust valves and two intake valves. Which technician is correct?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q4
The gasket surface of a cylinder head, as measured with a precision straightedge, should have a maximum variation of ________.
0.001 inch in any 6-inch length or 0.004 inch overall
0.002 inch in any 6-inch length or 0.004 inch overall
0.004 inch in any 10-inch length or 0.008 inch overall
0.020 inch in any 10-inch length or 0.020 inch overall
30s - Q5
A warped aluminum cylinder head can be restored to useful service by ________.
heating in an oven at 500°F with shims under each end, allowing it to cool, and then machining it
grinding the gasket surface and then align honing the camshaft bore
machining the gasket surface to one-half of the warped amount and then heating the head in an oven and allowing it to cool slowly
heating it to 500°F for 5 hours and cooling it rapidly before final machining
30s - Q6
Some vehicle manufacturers recommend repairing integral guides with ________.
valve guide inserts
replacement valve guides
knurling
OS stem valves
30s - Q7
Typical intake valve stem-to-guide clearance is ________.
0.005 to 0.010 inch (0.13 to 0.25 mm)
0.030 to 0.045 inch (0.8 to 0.10 mm)
0.015 to 0.020 inch (0.4 to 0.5 mm)
0.001 to 0.004 inch (0.025 to 0.076 mm)
30s - Q8
What other engine component may have to be machined if the cylinder heads are machined on a V-type engine?
Block deck
Intake manifold
Distributor mount (if the vehicle is so equipped)
Exhaust manifold
30s - Q9
Which type of valve guide is most used in a cast-iron head?
Integral
Powdered metal (PM)
Bronze
Thin-wall sleeve type
30s - Q10
Which of these statements is TRUE about surface finish?
Cast-iron surfaces should be smoother than aluminum surfaces
A cylinder head should be much smoother than a crankshaft journal
The smoother the surface, the higher the microinch finish measurement
The rougher the surface, the higher the microinch finish measurement
30s - Q11
Technician A says that the most commonly used combustion chamber types include hemispherical, and wedge. Technician B says that coolant and lubricating openings and passages are located throughout most cylinder heads. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q12
Technician A says that cylinder head resurfacing machines include grinders and milling machines. Technician B says that cylinder head resurfacing will change the compression ratio. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q13
Technician A says that the only valve guide repair option for integral valve guides is to use oversize-stem valves. Technician B says that valve guides should be checked for wear using a ball gauge or a dial indicator. Who is right?
Technician A only
Technician B only
Both technicians
Neither technician
30s - Q14
For lowest hydrocarbon emissions, which of these engine design features is used?
High combustion chamber surface-to-volume ratio
Low combustion chamber surface-to-volume ratio
Non-centrally mounted spark plug
Increased (as much as possible) quench area
30s - Q15
To help ensure proper engine cooling, most cylinder head designs use ________.
long exhaust ports and short intake ports
large exhaust crossover passages
short exhaust ports and long intake ports
coolant passages restricted by head gaskets
30s