Jeppesen Oral- Chapter 9 (Lubrication Systems) Flashcards
(30 cards)
faulty piston rings
Clean, cushion, cool, reduce friction, hydraulic medium
Light enough to circulate freely Viscous enough to provide cushioning
Becomes too thin, cause more damage
Operating load and temperature as well as rotational speed
To provide sufficient cushioning for momentary loads, To provide sufficient thickness for containment entrapment
Metal particles, dirt, carbon, moisture and acids
low oil supply
Causes slugging materials to repel each other and remain in suspension long enough to be trapped by oil filter or drained
To provide for oil foaming, thermal expansion and air in the oil return
Diluted oil, contaminated oil, and oil level being to high
Oil pressure relief valve
Directs oil either through the cooler or around it in order to maintain proper operating oil temperatures
high oil temperature
At the engine oil inlet
Indicates abnormal wear and imminent engine failure
Follow engine manufactures maintenance instruction
Turbine bearings
Synthetic oil
main oil pressure system, scavenge system and just before oil jet (last chance filter)
Air cooled Fuel cooled
It may become so thin, film is not thick enough and metal to metal contact happens
Is the oil temperature shown on the aircraft instrument panel the temperature of the oil entering the engine or of the oil leaving the engine?
It is the temperature of the oil entering the engine.
What is the purpose of oil dilution in a reciprocating engine?
When very cold weather is anticipated, gasoline can be mixed with the lubricating oil before the engine is shut down. This reduces the viscosity of the oil and makes starting easier. When the engine is running, the gasoline evaporates out of the oil.
