CM Advanced Ch.3

Question 1

What is a unit for measuring work per unit of time?

Answer 1

Horsepower

Question 2

One horsepower is equivalent to how many foot-pounds of work per minute?

Answer 2

33,000

Question 3

What is the theoretical power that an engine would deliver if all fictional losses were eliminated?

Answer 3

Indicated horsepower

Question 4

What is the actual amount of power that an engine can deliver at a certain speed with a wide-open throttle?

Answer 4

Brake horsepower

Question 5

What may be used to test an engine that has been removed from the vehicle it drives?

Answer 5

Engine dynometer

Question 6

What can give a quick report on engine conditions by measuring output at various speeds and loads?

Answer 6

Chassis dynometer

Question 7

What is the difference between indicated horsepower and brake horsepower?

Answer 7

Friction horsepower

Question 8

There are two kinds of horsepower commonly used by manufacturers in rating the power of construction vehicles: drawbar and what other type of horsepower?

Answer 8

Belt

Question 9

The three basic factors that affect an internal combustion engines power are as follows: COMPRESSION, IGNITION, and what else?

Answer 9

CARBURETION

Question 10

As a rule, what percent of the output of an engine is lost for every 1,000-foot increase in elevation above sea level?

Answer 10

2 1/2

Question 11

Engineers will deduct as much as 1% for each 10°F rise in the intake air temperature above a “normal” temperature of what?

Answer 11

70°F

Question 12

Low oil pressure usually indicates what?

Answer 12

Worn engine bearings

Question 13

Valve and tappet noise is a regular clicking sound that increases in intensity as the engine speed increases. The cause is usually excessive what?

Answer 13

Valve clearance

Question 14

What may be detected by a hollow, bell like knock and is due to the rocking back and forth of the piston in the cylinder?

Answer 14

Piston slap

Question 15

What is a heavy, dull, metallic knock that is noticeable when the engine is under load or accelerating?

Answer 15

Crankshaft knock

Question 16

Four of the most widely used testing instruments are the cylinder compression tester, vacuum gauge, cylinder leakage tester, and what else?

Answer 16

Tachometer

Question 17

The compression pressure in the different cylinders of an engine may vary as much as how many pounds?

Answer 17

20

Question 18

Normal compression readings for gasoline engine cylinders are usually what psi or slightly higher?

Answer 18

100

Question 19

When a test is made at an elevation of 1,000 feet or less, an engine in good condition, idling at a speed of about 550 rpm, should give a steady reading of from 17 to how many inches on the vacuum gauge?

Answer 19

22

Question 20

What is a speed-indicating instrument that measures the rpm of a rotating shaft?

Answer 20

Tachometer

Question 21

What may be caused by gum or carbon deposits, worn valve guides, a warped valve stem, insufficient oil, cold engine operation, or overheating?

Answer 21

Sticking valves

Question 22

What may be caused by a sticking valve, insufficient valve taller clearance, a distorted seat, overheated engine, lean fuel-air mixture, pre-ignition, detonation, or valve seat leakage?

Answer 22

Valve burning

Question 23

What may occur by valve overheating, detonation, excessive tappet clearance, seat eccentric to stem, cocked spring or retainer, or scratches on the stem caused by improper cleaning?

Answer 23

Valve breakage

Question 24

What may be caused by excessive tappet clearance, dirt on the face, or distortion?

Answer 24

Valve face wear

Question 25

What may be produced by gum in the fuel, a rich fuel mixture, poor combustion, worm valve guides, dirty oil, or the use of a wrong oil?

Answer 25

Valve deposits

Question 26

The first indication of a faulty hydraulic valve lifter is what type of noise?

Answer 26

Clicking

Question 27

The first step in servicing valves after they have been removed from the engine is to rid them of what?

Answer 27

Carbon

Question 28

Two general types of valve seat grinders are in use. One is a concentric grinder; the other, is what type of grinder?

Answer 28

Eccentric

Question 29

Before installing a new valve seat insert, chill it for how many minutes in dry ice or by any other chilling method?

Answer 29

15

Question 30

There are two types of valve lifters: the solid type and what other type?

Answer 30

Hydraulic

Question 31

The relationship between the camshaft and the crankshaft determine the what?

Answer 31

Valve timing

Question 32

Most modern engines have main and connecting rod bearings of what type, which can be replaced without removing the crankshaft?

Answer 32

Precision-insert

Question 33

Journals that are tapered or out of round more than what amount must be regrounded?

Answer 33

.003

Question 34

What is a plastic material that is flattened by pressure?

Answer 34

Plastigage

Question 35

If the crankshaft is locked or drags noticeably after the bearing cap has been replaced and tightened, then the bearing clearance is less than the thickness of the feeler stock. If it does not tighten or drag, place an additional thickness of feeler stock on top of the first and again check the ease of crankshaft movement, clearance normally should be about what?

Answer 35

.002 inch

Question 36

There are two methods of refinishing cylinders: what are they?

Answer 36

Honing and boring

Question 37

What is used sometimes to “break” or “crack” the glaze on cylinder walls when new rings are installed?

Answer 37

Honing

Question 38

After a piston has been cleaned it should be measured with what?

Answer 38

Outside micrometer

Question 39

Upon starting the newly overhauled engine, of mo oil pressure is observed in the first how many seconds, shut the engine down and find the cause?

Answer 39

10 to 15