Unit 4

Question 1

What property of engine drive belts causes you to always replace belts as a set?

Answer 1

Stretch slightly over time

Question 2

Which component causes the engine to overheat or run cooler than normal if it fails?

Answer 2

Thermostat

Question 3

What coolant heater has the main advantage of warming the engine in a very short period of time?

Answer 3

Circulating

Question 4

What do you do if you have any doubt as to whether a hose is good or not?

Answer 4

Replace it

Question 5

Which coolant heater is installed internally in the engine block in place of a freeze plug?

Answer 5

Immersion

Question 6

Why do you never turn the power on to the heater until the engine is full of coolant?

Answer 6

It could burn the heater up

Question 7

Identify the engine component where glow plugs are installed

Answer 7

Intake manifolds

Question 8

Identify the only safe method of using ether in an engine

Answer 8

Closed dispensing system

Question 9

What would cause an engine to run below normal operating temperatures?

Answer 9

Thermostat stuck open

Question 10

What would cause an engine to run above normal operating temperatures?

Answer 10

Thermostat is inoperative

Question 11

Which component do two stroke engines have that serves the same purpose as the intake manifold of four-stroke engines?

Answer 11

Air box

Question 12

At what speeds do turbochargers normally rotate?

Answer 12

10,000 to over 100,000 rpm

Question 13

Identify the component that increases the density of the intake air and permits greater efficiency from the engine?

Answer 13

Intercooler

Question 14

The exhaust system component that consists of a series of perforated baffles within a cylindrical container is called

Answer 14

Silencer

Question 15

How is exhaust piping connected?

Answer 15

Welds or clamps

Question 16

Which intake component directs air into the cylinders?

Answer 16

Intake manifold

Question 17

Which part of a turbocharger do exhaust gases travel?

Answer 17

Turbine

Question 18

Which system has leaks that often create a whistling sound?

Answer 18

Intake

Question 19

Which area is not part of inspecting an intercooler?

Answer 19

Coolant level

Question 20

In which component might you see leaks because of the carbon-colored discoloration of parts of surfaces adjacent to the leak?

Answer 20

Exhaust manifold

Question 21

What is a major factor in erosion in the exhaust silencer?

Answer 21

Contamination in the fuel oil

Question 22

With what do you coat the exhaust gasket to the turbine before you position it on the exhaust manifold flange?

Answer 22

High temperature anti-seize compound

Question 23

How much coolant must you drain from the cooling system to replace the intercooler?

Answer 23

Below the level of the intercooler

Question 24

How can you determine correct torque specification can be found when replacing an intake manifold?

Answer 24

Technical Order (TO) or manufacturers’ manual

Question 25

What can happen if you work on an exhaust system and it has not been allowed to cool?

Answer 25

You can receive third degree burns