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Cooling systems > Lubrication > Flashcards

Flashcards in Lubrication Deck (46):
1

Oil functions

Reduce wear
Clean
absorb heat
seal

2

For long service life from engines

oil must be matched to the engine and the operating conditions

3

Viscosity

Viscosity is an oils resistance to flow
Measured by the time for a specific amount of oil to move through a fixed orifice at a certain temp

4

Oil with to high of viscosity will cause

increased load on the engine trying to overcome the friction of the oil

5

oil with to low of viscosity

oil will not cling together under load and causing metal to metal contact

6

SAE

society of automotive engineers

7

Viscosity index

the rate that oil will change viscosity as the temperature changes

8

pour point

is the lowest temperature at which the test fluid can be poured at a 45 degree angle

9

Oil additives

chemicals added to the oil by the manufacturer to eliminate specific problems that may be encountered during operation

10

carbon particles

is a by product of the combustion process and form an abrasive wear particle

11

detergents

keep oil by products from forming on internal engine parts

12

dispersants

keep deposits suspended in the oil to be collected in the filter

13

Oxidation inhibitors

prevent oil from absorbing excess oxygen also prevent general corrosion relating to alloy bearing material

14

Anti-rust agents

help maintain a film of oil on components when engine is not operating

15

API

American petroleum institute
sets standards for oil classification

16

SI classification

spark ignition engine oil

17

CI classification

Compression ignition Engine oil

18

Synthetic oil

Becoming more popular for its ability for cold weather starting and reduced drag on the engine

19

Storage and handling

oil and filter changes should have there own bay to avoid air born contamination

20

Majority of pre mature engine failure

Dirt introduced into the oil from service persons

21

Oil sampling

Analysis program that works best when developed by the appropriate oil laboratory and service tech

22

Most reliable oil sample is taken when

Oil is hot
sample location is clean
Taken from mid stream

23

Oil plugs with magnetic ends

Should be checked for after removal for contamination

24

two main purpose of oil analysis

determine the suitability of the oil
interpret results and determine if there are any existing internal problems

25

Oil analysis can reveal

proper oil temp during operation
coolant leaks
dirt and dust in engine
fuel dilution
effective oil filters
crank case blow by
effective oil change interval

26

Lubrication system functions

creates the pressure and provides the delivery system needed to move engine oil throughout the engine

27

Two types of lubrication systems

splash and pressurized
full pressure

28

Crankcase

used to store and cool supply of engine oil used in the system also allows dirt and debris to settle out
as well as air bubbles to disperse

29

RTV sealant

room temperature vulcanizing
can plug pick up screens if too much is used

30

Oil level indicators

Dip sticks and sight glass
oil must be check on level surface

31

Oil pressure gauge

reads the pressure of the oil during engine operation
will read high pressure when oil is cold

32

Engine run in

new engines have very small tolerance between components and oil pressure may read high until these components wear to a point where oil pressure will be a constant

33

Oil pump capacity

as much as 70% more to keep oil demand as engine wears over time

34

Two types of oil pumps

external gear
internal gear or rotor pump

35

external gear pumps

has two gears working in tandem to create a low pressure at the inlet and forcing oil out the outlet side

36

Rotor type pump

inner rotor drives the outer as rotor turns oil is squeezed between the rotor lobes and forced out the outlet

37

Pressure regulating valves

maintain system pressure during normal operating conditions

38

oil pressure relief valve

prevents system damage by allowing oil to return back to pan if pressures reach higher then operational normal
relief valve pressure set higher then regulating valve

39

Two types of oil coolers

Air to oil
oil to coolant

40

Oil bypass valve

thermostatic by pass valves allow cold oil to around bypass engine cooler until it reaches operating temp for faster warm up

41

two oil filter designs

bypass and full flow

42

by pass filter

5%-10% of oil from the oil pump is filtered and return directly back to oil pan
often clean oil much more thoroughly then full flow
may trap particles down to 10 microns in size

43

full flow filter

filters all oil supplied to the engine traps particles down to 25 to 60 microns in size

44

when bypass valve in filter is open

full flow filter becomes a shunt filter delivering both filtered and unfiltered oil to the engine

45

crank case ventilation system

required to remove water vapour oil vapour combustion vapours and fuel vapours
engine must remain warm to be most effective

46

crank case ventilation system operation

during vehicle a low pressure is formed at the end of outlet tube and vapours are drawn out and dispersed fresh air enters through the valve cover filter