Exhaust, Cooling, Lubrication and Ventilation D2L

Question 1

Catalytic converters requires heat to reduce the quantity of toxic gasses in the exhaust. What is the minimum outlet temperature difference, for it to work correctly?

Answer 1

100 degrees FAHRENHEIT

Question 2

What problems would be created if the engine temperatures were too high?

Answer 2

Pre-ignition

Burnt valves

Scored liners

Question 3

How is the flow of the coolant created inside an engine with a closed loop system?

Answer 3

By a dynamic pump

module; Centrifugal, non-positive, displacement type pumps driven by the engine.

Question 4

What device maintains the pressure inside a closed loop cooling system?

Answer 4

Radiator Cap

Question 5

If the coolant passageways showed signs of corrosion, which of the following problems would have caused the corrosion?

Answer 5

Coolant that has been mixed with oil

Question 6

True or False;
It is safe to open the radiator cap on an engine, immediately after shutting the engine down and before it cools.

Answer 6

False, she will spray hot ass coolant all over the place.

Question 7

3 reasons for using glycol in an engine cooling system.

Answer 7

Increases the boiling point of the water

Resists scale and corrosion in the engine

Lowers the freezing point of the water

Question 8

What is the purpose of an expansion tank in an engine cooling system?

Answer 8

Allows for the volume of the coolant to expand or contract

Question 9

True or False;
Coolant dripping from the weep hole on the water pump would indicate the pump shaft seal is leaking

Answer 9

True

Question 10

What type of pump is used to circulate the oil in an engine?

Answer 10

Positive displacement rotary pump
most common; external gear type

also used; vane, internal gear, and gerotor pumps

Question 11

True or False;
The maximum oil pressure in an engine lubrication system is between 20 and 30 psi.

Answer 11

False
module; 30-60psi

Question 12

Which type of oil filtration system pushes all the oil from the pump through the oil filter before going to the bearings?

Answer 12

Full-Flow filration

Question 13

Which stage of running an engine is where the majority of engine wear occurs?

Answer 13

On start-up

Question 14

Oil relief valve stuck open,
Worn oil pump,
Blocked suction strainer,
Oil viscosity too low,
These 4 conditions could cause what?

Answer 14

These conditions would cause the oil pressure in an engine to drop below the recommended amount.

Question 15

If a manometer is connected to the crankcase of an engine, which problem could it be used to indicate?

Answer 15

Leaking rings or scuffed liners