Module 3 lubricating systems Flashcards
What are the functions of lubricating oils perform ?
Reduce friction Seal Cushion Clean Protect against corrosion Absorbs heat
Do engine lubricates oil eliminate friction ?
No- provides a thin supporting film between parts
What’s a viscosity?
Resistance to flow
What method of testing is used to determine viscosity in aviation?
Say bolt test
What is the flash point of an oil ?
Temperature at such ignitable vapor is produced
Name types of oil systems
Splash
Pressure
Spray
An oil with no additive used for engines break-in is?
Mineral oil
Multi viscosity 10W30 w stands for?
Suitable for cold weather operations
SAE 15W50 the 50 stands for ?
The higher viscosity of the oil when is hot
What are the advantages of an Ashlees-dispersent oil
Prevents ash deposits which can lead to spark plug fouling and preignition
Anti-wear
Anti-foam
Oil systems
Wet-sump
Dry-sump
In addition to a pressure pump, the dry sump system has a _____________ pump
Scavenge
What is the purpose of the hopper in the dry sump system?
Engine oil operation temperature quicker
When oil should be diluted?
Immediately before engine shut down.
For oil dilution, only engine oil affected
What is meant by the oil pour point ?
Lowest temperature at which it flows or can be poured
A constant displacement pump is use in which pump systems
Used in both Dry and Wt sump systems
Before adjusting the oil pressure you must?
Check the accuracy of the oil pressure gauge
A spin-on semi-depth filter is design to used how many times?
Once
The Lycoming 0-320-A2B engines uses what type of oil sump?
Gear type, constant displacement
What is the purpose of the engine oil cooler
Remove the heats absorbs by the oil
Under what operating does must wear occurs?
During the start up and warm up
The engine oil filter should be checked for ?
Contaminants
Ferrous iron metal particles
Shinny non-ferrous particles
And bronze
Operating a wet sump engine to high oil supply will result in ?
Oil discharge out the engine breather
What is the function of the oil cooler bypass valve
As the oil heats up the thermostatic (by pass valve ) closes forcing the oil flow trough the oil cooler
Oil system maintenance
- Checking oil levels -daily
- Oil filter replacement-100 hours or at oil change
- Oil change- as required by manufacture instructions
- Relief valve adjustment-as required
