Lubrication system Flashcards
What is Straight mineral oil
Natural lubricating oil that has no additives for foaming, cleaning, or viscosity
What is ashless Dispersant oil
Mineral oil with additives that evenly spread contaminants through the oil. The additives that are used to not form Ashes
What is synthetic oil
Oil that is man-made through the process of chemically altering the Molecular structure of petroleum oil in order to achieve the desired characteristics
What is meant by multiviscosity oil
It is an oil that has varying viscosity
When it oil is cold, it will have low viscosity, but when it is warms up, the viscosity will increase for a better lubrication. For example 5W 30 has a viscosity index of five when it is cold but 30 when it is warm
What are the purposes of reciprocating engine oil
It cleans, Cools , cushions, seals, and lubricates parts
What is the most important property that aircraft reciprocating engine oil must possess
Viscosity
What factors must be considered in determining the proper grade of oil to use in a specific engine
Operating load, rotational speeds, and operating temperatures are the most important factors to be considered
What is the purpose of the oil flow control valve” Oil cooler bypass valve”
When the oil is cool the valve will direct it around the oil cooler. When the oil is warm it will be directed through the oil cooler
What is the main oil contaminants
Gasoline, moisture, acid, dirt, Corbin, and metallic particles
From what location on a reciprocating engine is the oil temperature usually taken
In either system,The bulb is located where it measures oil temperature before it enters the hot section of the engine
In a dry simplification system the oil temperature bulb is located anywhere in the oil inlet line between the oil tank and the engine. Wet some systems have the temperature ball located where his senses the temperature after the oil passes through the oil cooler
What do metallic particles on oil screen indicated
Metallic particles may be an indication of internal failure of the engine
What could cause oil foaming
Caused by diluted oil, contaminated oil, or the oil level is too high
What would be an indication of blocked oil cooler passages
High oil temp
What would be an indication of an in adequate oil supply
Low oil pressure and high oil temperatures
What type of oil is used in turbine engine lubrication systems
Specially developed synthetic oil’s
Where can you find the specified grade of oil for a particular Aircraft
Oil grade can be found in an airplane flight manual or pilots operating handbook
What are two types of oil coolers used in turbine engine lubrication systems
Air cooled oil cooler and fuel cooled oil cooler
What is the meaning of oil flashpoint, fire point
The temperature at which the oil will begin to give off ignitable vapors.
What is the weight of aircraft engine oil
7.5 pounds per US gallon
What is the purpose of an oil dilution system
Change the oil by introducing fuel into the lubrication system which makes cold weather starting easier.
Fuel is used because it will evaporate out of the oil and leave through the crank case breather
What is the primary purpose of engine oil lubricant
To reduce friction
What is the S.O.A.P analysis
Is an oil analysis system that establishes a trend to measure engine health. One test does not do much unless something is very wrong
Where are carbon seals used in turbine engine’s
Carbon seals are used an aircraft gearboxes, air turban motor starters, and main shaft seals
What is the key purpose of lubrication in a turbine engine
Lubrication of the main shaft bearing
Where are engine oil filters located
oil pump output and the engine bearings
Why do reciprocating engines require oil with high viscosity index
High Viscosity indexes allow for easier starting in cold temperatures and prevent the oil from becoming too thin and operating temperatures to protect the bearings under operating loads
Why do reciprocating engines require high viscosity oil
Viscosity oil performs better and reciprocating engines because they have large clearances, high operating temperatures, and high bearing pressure
What two factors impact fluid viscosity
Temperature and pressure, although pressure has a very small affect on viscosity
