Powerplant Systems & Components: Lubrication Systems π Flashcards
What is straight mineral oil?
A type of natural oil that has no additives for foaming, cleaning, or viscosity
What is ashless dispersant (AD) oil?
It is a type of mineral oil with additives that evenly spread contaminates throughout the oil. The additives that are used do not form ashes.
What is synthetic oil?
It is an oil that is man-made through the process of chemically altering the molecular structure of petroleum oil to achieve desired characteristics
What is meant by multi-viscosity oil?
It has varying viscosity; cold oil have low viscosity but when it warms up the viscosity increases for better lubrication.
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 (a measurement of frictional resistance to flow)
What factors must be considered in determining the proper grade of oil to use in a specific engine?
The operating load, rotational speeds, and operating temperatures are the most important to consider
What is the purpose of the oil flow control valve βoil cooler bypass valveβ?
When the oil is cool the valve will direct it around the oil cooler, when it warms it will direct it through the oil cooler
What are come oil contaminants?
Gasoline, moisture, acid, dirt, carbon, and metallic particles
From what location on a reciprocating engine is the oil temperature usually taken?
The bulb is located where it measures oil temperature before it enters the hot sections of the engine. In a dry sump lubricating system, the bulb is located anywhere in the oil inlet line between the oil tank and the engine. Wet sump systems have the bulb located where it senses the temperature after the oil passes through the oil cooler.
What do metallic particles on an oil screen indicate?
They may indicate an internal failure of the engine
What could cause oil foaming?
Diluted oil, contaminated oil, or the oil level is too high
What would be an indication of blocked oil cooler passages?
High oil temperature
What would be an indication of an inadequate oil supply?
Low oil pressure and high oil temperature
What type of oil is used in turbine engine lubrication systems?
Specially developed synthetic oils