Lubrication Systems Flashcards

1
Q

A reciprocating engine is found to have excessive oil consumption without evidence of any oil leaks. What is the likely cause?

A

The piston rings are worn or broken.

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2
Q

What are the functions of lubricating oil in reciprocating engines?

A

Reduce friction between moving parts.
Remove heat.

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3
Q

Name two important characteristics of aircraft engine oil. 

A

Must be light enough to circulate freely yet heavy enough to provide the proper oil film and engine operating temperatures. 

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4
Q

What could happen to an oil that is too low in viscosity at normal engine operating temperatures?

A

It may become so thin that the oil film between moving parts is easily broken, resulting in premature wear. 

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5
Q

What are some of the factors that must be considered by an engine manufacturer in determining the proper grade of oil for a particular engine?

A

The operating load and temperature as well as the rotational speed.

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6
Q

Why do aircraft reciprocating engines use a relatively high viscosity oil?

A

Because they usually have large operating clearances and operate at high temperatures and pressures.

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7
Q

Name some oil contaminants:

A

Metal particles.
Dirt.
Carbon.
Moisture.
Acids.

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8
Q

In ashless dispersant oils, what function does the dispersant perform?

A

The dispersant causes sludge forming materials to repel each other, and remain in suspension until they can be trapped by the oil filter or drained. 

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9
Q

Why do oil reservoirs have expansion space?

A

To provide for:
Oil foaming.
Thermal expansion.
Air in the return oil.

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10
Q

What is a possible indication of low oil pressure together with high oil temperature?

A

Low or inadequate oil supply.

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11
Q

What could cause oil foaming?

A

Diluted oil.
Contaminated oil.
Oil level too high.

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12
Q

What controls oil pressure in a Gear type oil pressure pump?

A

The oil pressure relief valve 

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13
Q

What function does an oil cooler bypass valve perform?

A

It directs the oil either through the cooler or around it in order to maintain proper operating temperatures.

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14
Q

What could be a possible indication if the oil cooler passage becomes obstructed?

A

A high oil temperature.

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15
Q

Where is the oil temperature bulb usually located?

A

At the engine oil inlet

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16
Q

What does the presence of metal particles in an engine oil filter indicate?

A

Depending on the type and size of the metal particles, this usually indicates abnormal wear, and possible internal engine failure. 

17
Q

What should be done if metal particles are found in an engine oil filter?

A

Follow the engine manufacturer’s maintenance instructions

18
Q

Where is the most critical point of lubrication in a gas turbine engine?

A

At the turbine bearing

19
Q

What type of oil is used in a turbine engine oil system?

A

Synthetic oil

20
Q

Where are oil screens or filters most likely located in a turbine engine oil system?

A

At the oil pressure system (main filter).
Scavenge system.
Just before the oil jet (last chance).

21
Q

Name two types of turbine engine oil coolers:

A

Air cooled.
Fuel cooled.