Lube Systems And Crankcase Ventilation

Question 1

Good quality oil will?

Answer 1

Reduce wear, Clean, Absorb heat, Act as a sealant

Question 2

Viscosity?

Answer 2

is a measure of a resistance to flow. High viscosity oil flows slower, low viscosity flows quicker

Question 3

What happens to oil viscosity when the temperature increases?

Answer 3

Increase in viscosity when cooled

Decrease in viscosity when heated

Question 4

What is viscosity index?

Answer 4

Refers to the rate that oil will change viscosity as the temperature changes.

Question 5

High vs low viscosity index?

Answer 5

High - Small changes in viscosity through temp changes

Low - large changes in viscosity through temp changes

Question 6

What is pour point?

Answer 6

The lowest temp that oil will flow from a full test tube on a 45* angle

Question 7

What is purpose of oil detergents?

Answer 7

Prevent deposits from forming on internal engine parts?

Question 8

What is purpose of dispersants?

Answer 8

Keep the deposits suspended in the oil

Question 9

Function of oxidation inhibitors?

Answer 9

Prevent the oil from absorbing excess oxygen, this will reduce the build up of varnish and sludge in the oil

Question 10

Function of Anti-rust additives?

Answer 10

To help maintain an oil film on exposed internal engine parts when the engine is not running. This feature is sometimes referred to as oiliness.

Question 11

Oil is classified according to?

Answer 11

Standards set by the American petroleum institute (API)

Question 12

Oil SI classification?

Answer 12

Refers to oils used in spark ignition engines

Question 13

Oil CI classification?

Answer 13

Describes oil used in compression ignition engines

Question 14

To obtain the most reliable result, the oil sample should be gathered?

Answer 14

When oil is hot and particles are still in suspension, and the sample is taken during midstream of the oil drain

Question 15

What are the 2 main purposes of an oil analysis?

Answer 15

Determine the suitability of the oil for further use.

Determine if there are any existing internal problems.

Question 16

What are the 2 types of lubrication systems?

Answer 16

Full pressure - all oil is delivered through pump pressure

Splash and pressure - Combination of splash and pressure lubrication used

Question 17

What is the function of the oil pan?

Answer 17

It is used to store and cool the supply of lubricating oil

Question 18

Wet sump vs Dry sump

Answer 18

Wet sump - Wet the pan and lower crankcase are used for the storage of oil
Dry sump - the engine oil supply is stored in a remote location

Question 19

To allow more heat transfer oil pans may be made of?

Answer 19

Sheet steel or aluminum

Question 20

What are the two most common designs of oil pumps?

Answer 20

External and rotor type

Question 21

What is the purpose of the oil pressure regulating valve?

Answer 21

Maintain the system oil pressure within normal operating limits.

Question 22

What are the two main types of oil coolers?

Answer 22

Oil to air

Oil to coolant

Question 23

What is purpose of oil cooler bypass valve?

Answer 23

Allow oil to bypass the cooler when trying to get the engine warm at start up

Question 24

Two types of oil filters? Function?

Answer 24

Full flow - Filter oil going to block

Bypass - Filters 5-10% of pump oil and return it to the pan

Question 25

What is the purpose of a crankcase ventilation system?

Answer 25

Removes combustion gases and water vapours from the crankcase, to avoid over pressurizing

Question 26

What are the two styles of crankcase ventilation?

Answer 26

Road draft - expelled towards the ground

Positive crankcase ventilation - Vented back into the intake

Question 27

Oil pump components should be inspected for?

Answer 27

Score marks, Worn shafts, cracked housings, teeth pits, radial and axial play

Question 28

Amount of oil consumed during operation can be affected by?

Answer 28

Age and condition of engine, Type and design, Type of service, Operating condition, Internal problems, External factors

Question 29

What can occur if the oil level is too high?

Answer 29

Oil foaming

Question 30

What are the three main oil indicators used on the majority of engines?

Answer 30

Level indicators
Pressure indicators
Temperature indicators

Question 31

What can happen if the crankcase were to become over pressurized?

Answer 31

Oil leakage past seals and gaskets could occur. The oil may become contaminated with acid, water and fuel buildup.