the air. Others ensure complete combustion of fuel that
leaves the combustion chamber and others just increase
engine efficiency to reduce air pollution.
The drive train transfers engine power to the drive
wheels. Both front-wheel and rear-wheel drive are found
on today’s vehicles. Front-wheel-drive vehicles have a
transaxle, which is the transmission and differential com-
bined in a single unit.
Review Questions—Chapter 1
Please do not write in this text. Write your answers on
a separate sheet of paper.
1. The _____ is the main supporting structure of an
engine.
2. These hold the crankshaft in the bottom of the engine
block.
(A) Cam bearings.
(B) Main caps.
(C) Decks.
(D) Rod bearings.
3. _____ surround the cylinders in most engines to provide
a way for coolant to remove heat from the cylinders.
4. What is the basic function of a piston?
5. _____ keep combustion pressure from blowing into
the crankcase and they also keep _____ out of the
combustion chamber.
6. Why is a piston pin or wrist pin needed?
7. The crankshaft converts the _____ motion of the
piston into rotary motion.
8. Describe the basic parts of a cylinder head.
9. Which type of engine valve is larger and which type
is smaller?
10. Summarize the four-stroke cycle.
11. The _____ opens the valves and allows them to close.
12. Why are the cooling and lubrication systems important?
13. An electric ignition system can be found on a(n)
_____ engine but not on a(n) _____ engine.
14. What are the two types of fuel systems in use today?
15. Describe the three basic subsystems in a computer
control system.
ASE-Type Questions—Chapter 1
1. Technician A says an engine’s timing belt turns the
camshaft at one-half of engine speed. Technician B
says the camshaft opens the exhaust valve at the
beginning of the power stroke. Who is correct?
(A) A only.
(B) B only.
(C) Both A and B.
(D) Neither A nor B.
2. Technician A says that the illustration is of a gasoline
injection system. Technician B says that a diesel injec-
tion system injects fuel directly into the cylinder. Who
is correct?
(A) A only.
(B) B only.
(C) Both A and B.
(D) Neither A nor B.
3. All of the following are major parts of a modern,
multi-cylinder automotive engine except:
(A) valve springs.
(B) spool valves.
(C) piston rings.
(D) connecting rods.
4. A(n) _____ is the flat surface machined on the top of
the cylinder block for the cylinder head.
(A) cam housing
(B) engine block deck
(C) oil gallery
(D) None of the above.
26 Auto Engine Repair
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