Lubrication Flashcards
__________ _____ is better at keeping particles in suspension (break in point)
Mineral Oil
When starting in cold temperatures, what could you do to decrease the viscosity of the oil?
Pre-Heat Oil Fuel Dilution
_______ is a liquid’s resistance to flow
Viscosity
Viscosity is measured using a _________ ___________ _____________
Saybolt Universal Viscosimeter
________ _______ is the temperature at which the chemicals normally suspended in the oil begin to solidify/separate into crystals
Cloud Point
______ _____ is the temperature at which oil emits fumes
Flash Point
______ _____ is the temperature where there is enough fumes for combustion
Fire Point
Mineral Oil tends to _______ when heavily contaminated
sludge
More commonly used oil are ____________ ____________ oils
Ashless Dispersant
_______-_________ oils allows operation in a wide temp range
Multi-Viscosity
_____ sump oil system is where most oil control elements are contained within the engine
Wet
_____ sump oil system is where oil is stored outside the engine in a tank, and requires a scavenge pump
Dry
What type of pump is usually used to deliver oil to the pressure system?
Constant displacement EDP
The pressure relief valve can be ___________ or ________
adjustable fixed
How is an adjustable pressure relief valve actuated?
Spring with a ball/dome
How is a fixed pressure relief valve actuated?
Adding/removing washers
What kind of oil filters are there?
Full flow, bypass/partial flow
In an engine during a cold start, before oil comes to temperature, how is the oil kept from the cooling system?
Oil is bypassed around the cooler using a bypass valve (vernotherm valve). Then as the valve heats up, it expands and closes.
Oil separator is used with which kind of air pumps?
Wet-type
Large Radial engines use this system, adding small amounts of fuel to the oil before shutdown, allowing for less viscous oil for the next startup in cold temperatures.
Oil dilution sysem
Other aircraft engines use ___-________ to heat up oil
Pre-heaters
What does oil provide for engines?
Sealing, cooling, cleaning, actuation, corrosion prevention, lubrication
The Higher the number on the oil part number =?
Thicker fluid/High viscosity fluid
In Multi-Viscosity Oils, what does the first number represent?
Viscosity at Low temperatures
What kind of bypass valves are there for an oil cooler?
Pressure, temperature
What is the most common type of oil pump?
Gear pump
When do you use Mineral oil?
During the break-in period if an engine
