Engine And Engine Support Systems

Question 1

What is the freeze point of 50/50 coolant

Answer 1

-37c

Question 2

What does it mean if both heater core hoses are hot to the touch

Answer 2

Normal condition

Question 3

Metal in engine cooling passages caused by

Answer 3

Electrolysis from lack of coolant replacement

Question 4

If a thermometer heater element has a open circuit what would be the result

Answer 4

The engine will run at normal operating temperature

Question 5

A engine overheats before and after a thermostat replacement and no external leaks are found what would cause this

Answer 5

A bad water pump

Question 6

Bubbles coming from the over flow

Answer 6

Bad head gasket from combustion entering the cooling system

Question 7

What does a coolant temp sensor read when disconnected

Answer 7

-40

Question 8

A electric cooling fan runs on high at all times

Answer 8

Fan relay is stuck closed

Question 9

What’s a good minimum oil pressure

Answer 9

10 psi per 1000 rpm hot

Question 10

What oil pump can vary output volume

Answer 10

Vane

Question 11

What clearance measurement is needed in a generator oil pump

Answer 11

Inner to outer tip to tip clearance

Question 12

White streaks on the engine oil dip stick indicate

Answer 12

Coolant is entering the oil

Question 13

Copper flakes are found in engine oil

Answer 13

Crankshaft bearing wear

Question 14

Fluctuating oil pressure gauge is from

Answer 14

Overfilled engine oil (air in oil)

Question 15

Engine makes rattle noise when throttle is snapped but goes away when engine is in gear

Answer 15

Cracked flex plate

Question 16

Popping noise is heard from intake manifold when spark is disabled from the one cylinder the noise lessens

Answer 16

Faulty intake valve

Question 17

Puff of blue smoke when the vehicle leaves stop sign

Answer 17

Bad valve seals

Question 18

Runs smooth when cold but knocks when warm

Answer 18

Worn connecting rod bearings

Question 19

Clatter from cylinder block noise is not affected by temp or spark removal

Answer 19

Seized wrist pin

Question 20

Continuous noise of steel rubbing in metal at front of engine

Answer 20

Stretched timing chain

Question 21

Decrease in oil pressure over several years of engine life

Answer 21

Increasing engine internal clearance

Question 22

Bell like sound from cold engine as it warms it goes away

Answer 22

Collapsed piston

Question 23

Double knock sound at idle that is not temp affected

Answer 23

Worn wrist pins

Question 24

What is an unacceptable leak down reading

Answer 24

20%

Question 25

What do you need between cylinders on a compression test

Answer 25

Difference of no more then 20%

Question 26

Misfire on pushrod engine

Answer 26

Stripped rocker stud

Question 27

Quick way to find if valves are bent if a timing chain brakes

Answer 27

Valve stem height is not uniform

Question 28

Exhaust valve has carbon build up on stem

Answer 28

Valve guid is worn

Question 29

Valve to guide tolerance

Answer 29

.005”

Question 30

When adjusting hydraulic lifters where should the lifter be positioned on the crankshaft

Answer 30

On the lone heel

Question 31

Difference between bucket and roller follower

Answer 31

Bucket must spin in the lifter bore