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SKT Book 3 > B3U4 Cooling Systems And Engine Strating Aids > Flashcards

B3U4 Cooling Systems And Engine Strating Aids Flashcards

1
Q

What happens to the thermostat when the coolant reaches operating temperature?

A

The thermostat opens allowing the hot coolant to move to the radiator.

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2
Q

What are the three common types of coolant hoses?

A

(1) Straight hoses.
(2) Wire-reinforced hose.
(3) Flex hose.

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3
Q

Regardless of the design, what three parts make up a radiator?

A

(1) Tanks.
(2) A core.
(3) A pressure cap.

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4
Q

What determines whether the fan is suction or blowing?

A

The pitch of the blade and the direction that the fan spins.

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5
Q

What is the common mixture you find as your coolant?

A

60 percent ethylene glycol to 40 percent water.

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6
Q

What types of fans might you find on an air-cooled engine?

A

Centrifugal or axial-flow type fan used.

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7
Q

Why does the coolant enter the lower portion of the water jacket pushing upward?

A

This ensures there is always coolant in contact with all internal engine components at all times.

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8
Q

At what pressure do most cooling systems operate?

A

10 to 15 psi

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9
Q

Where does the shroud direct the air on an air-cooled engine?

A

From the fan, across the cooling fins, and out away from the engine.

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10
Q

A 60 percent ethylene glycol to 40 percent water mixture raises the boiling point to what temperture?

A

Around 276 degrees F

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11
Q

Why are coolant additives necessary?

A

To prevent liner pitting, corrosion and scale build-up on your cooling system components.

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12
Q

What does scale in a cooling system cause?

A

Hot spots within the engine and clogs the tubes in the radiator core.

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13
Q

When is the hydrometer most accurate and easiest to read?

A

When you take the reading with the coolant near the normal operating temperature.

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14
Q

Once you have the fan and guards out of the way, what is the first step in removing the water pump?

A

Removing the coolant hoses.

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15
Q

What does removing the radiator cap before you drain the coolant do for you?

A

Prevent any vacuum hindering the coolant from draining.

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16
Q

For what do you inspect hoses?

A

Leaks at the connections, tightness of the hose clamps, cracks, dry rot, and pliability.

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17
Q

What are two ways tension is applied to belts?

A

(1) Spring loaded tensioning pulley.

(2) A pulley with a jacking bolt.

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18
Q

What are the two most common types of coolant heaters?

A

(1) Circulating.

(2) Immersion.

19
Q

How do immersion coolant heaters spread heat throughout the engine?

A

By convection, so warm-up time is increased when compared to external coolant heaters.

20
Q

Why is it important that you do not use starting fluid on engines that are equipped with glow plugs?

A

It can cause an explosion that can damage the engine and cause injury to you.

21
Q

What is the only safe method of using ether?

A

(1) With a closed dispensing system.

22
Q

What procedures are used when the operating temperatures are abnormally high?

A

(1)a closed dispensing system.
Adjust loose fan belts to their proper tension to prevent slippage.

(2) Check for improper size radiator or inadequate shrouding.
(3) Adjust, repair, or replace inoperative temperature-controlled fans.
(4) Check the coolant level, and fill the system to its proper level if low.
(5) Inspect for collapsed or disintegrated hoses, replace if faulty.
(6) If the thermostat is inoperative, remove, inspect, and test it. Replace the thermostat if you find it to be faulty.
(7) Check the water pump for loose or damaged impeller Inoperative thermostat, low coolant level and improperly sized or dirty radiator.

23
Q

What is the most likely cause for abnormal low operating temperatures?

A

Faulty thermostat.

24
Q

What type of situation causes the need to use a wire-reinforced hose in the cooling system to prevent the lower radiator hose collapse?

a. Low pressure from the engine.
b. Extreme heat from the radiator.
c. High suction from the water pump.
d. Excessive strain from the thermostat.

A

C. High suction form the water pump

25
Q

Which component collects the heat from the coolant in a radiator to transfer it to the air?

a. Fins.
b. Tank.
c. Radial fan.
d. Fan shrouding.

A

A. Fins

26
Q

What does antifreeze change in water when you mix it with water lowering the freezing point?

a. Specific gravity.
b. Properties of the oil.
c. Boiling point of the water.
d. Cooling effects of the water.

A

A. Specific Gravity

27
Q

Identify what drives the fan on an air cooled engine either directly or through gears?

a. Flywheel.
b. Camshaft.
c. Crankshaft.
d. Valve train.

A

C. Crankshaft

28
Q

Which portion of the engine does coolant enter the engine to ensure there is always coolant in contact with all internal engine components?

a. Middle.
b. Lower.
c. Upper.
d. Side.

A

B. Lower

29
Q

At what pressures do most cooling systems operate?

a. 3 to 5 pounds square inch (psi).
b. 10 to 15 psi.
c. 20 to 25 psi.
d. 40 to 50 psi

A

B. 10 to 15 psi

30
Q

What opens a valve on the radiator cap, thus allowing coolant to move from the expansion tank to the radiator?

a. Vacuum.
b. Pressure.
c. Pneumatics.
d. Temperature

A

A. Vacuum

31
Q

How do you add antifreeze to an engine while it is operating?

a. Mix it with a large amount of inhibitors.
b. Add straight water directly into the radiator.
c. Mix it thoroughly with a small amount of water.
d. Add straight antifreeze directly into the radiator.

A

C. Mix it thoroughly with a small amount of water.

32
Q

You inspect the water pump impeller’s ceramic seal for

a. leaks, vibrations, and cracks.
b. soot pockets, corrosion, and chips.
c. chips, cracks, and rough conditions.
d. corrosion, vibrations, and deformities.

A

C. Chips, cracks, and rough conditions.

33
Q

When you are inspecting a radiator, what component must be straight and free of debris?

a. Cap.
b. Fins.
c. Tank.
d. Hoses.

A

B. Fins.

34
Q

Identify the most common cause of leaks with hoses in a cooling system?

a. Bent fins.
b. Cracks at the tank.
c. Defective cap gasket.
d. Corroded hose connectors.

A

D. Corroded hose connectors

35
Q

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

a. Dry rot over time.
b. Deteriorate over time.
c. Stretch slightly over time.
d. None, belts do not need to be replaced as a set.

A

D. Stretch slightly over time.

36
Q

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

a. Hoses.
b. Radiator.
c. Thermostat.
d. Water pump.

A

C. Thermostat.

37
Q

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

a. Blanket.
b. Immersion.
c. Direct heat.
d. Circulating.

A

D. Circulating

38
Q

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

a. Reuse it.
b. Replace it.
c. Ask for another opinion.
d. Schedule it for replacement.

A

B. Replace it.

39
Q

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

a. Blanket.
b. Circulating.
c. Direct heat.
d. Immersion.

A

D. Immersion

40
Q

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

a. It boils the coolant.
b. It could burn the heater up.
c. It can cause a fire on the engine.
d. There are no problems that occur.

A

B. It could burn the heater up.

41
Q

Identify the engine component where glow plugs are installed.

a. Cylinder head.
b. Intake manifolds.
c. Air filter housing.
d. Exhaust manifold.

A

B. Intake manifolds

42
Q

Identify the only safe method of using ether in an engine?

a. Spray can.
b. Liquid mixture.
c. Open dispensing system.
d. Closed dispensing system.

A

D. Closed dispensing system

43
Q

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

a. Thermostat is stuck closed.
b. Thermostat stuck open.
c. Radiator clogged.
d. Broken fan belt.

A

Thermostat is stuck open.

44
Q

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

a. Radiator is too large.
b. Thermostat stuck open.
c. Thermostat is inoperative.
d. Rich fuel to air mixture.

A

B. Thermostat is inoperative.

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