190202c Lubrication Systems And Crankcase Ventilation Flashcards
What are the five functions of engine oil
Reduce wear, clean internal engine components, seal mating surfaces, absorb heat, reduce oxidization. Also reduces noise
What’s the definition of viscosity
Viscosity is a measurement relating to an oils resistance to flow. Thicker and colder oils generally have a higher viscosity
The term viscosity index refers to the rate the oil will change viscosity as the temperature changes. Would oil with a high viscosity index experience smaller changes in viscosity. Yes or no
Yes
The poor point of oil is determined by a special test. What angle is the test tube of oil moved to?
45°
What are couple of reasons why different additives may be added to engine oils
Engine operating conditions or fuel quality
Study the shit out of the motor oil guide handout page
Too much info to list here
What are four functions of an oil analysis program
To determine the condition of the oil, to detect potential component failures, to confirm existing problems, to adjust oil and filter change intervals
The oil analysis program is part of an overall preventative maintenance program. True or false
True
What’s the most common oil lubrication system used on mobile equipment
The full pressure system is the most common
What’s the purpose of the engine crankcase
The crankcase and oil pan function as the storage reservoir for the lubricating oil. The oil pan also helps cool the oil by contact with the passing airflow
What are three main oil indicators or gauges used on a majority of engines
Level, pressure and temperature
What’s the purpose of oil scavenging pumps
They are able to pick oil from the extreme ends of the oil pan during periods of high angle operation. Separate sumps are typically provided in the oil pan design for the scavenging pump intake suction screens
What’s the purpose of the pressure regulating valve
It prevents oil pressure from rising above a predetermined value
What’s the purpose of the relief valve
The relief valve opens if system pressure is extreme
Oil to coolant type of oil coolers are designed to do what
All oil coolers are designed to do just that. Lower the temperature of the oil
A full flow oil filter assembly must have a bypass valve installed why
The bypass valve will open if the filter element becomes plugged or if the oil is extremely cold. Some dirty oil is better than no oil it all
Which filter element will clean the oil to a smaller micron size. the bypass or full flow filter
Generally the bypass element will clean to a lower micron level than the full flow filter
True or false the crankcase ventilation system will help remove combustion gases, water and fuel vapor from the crankcase
True
If the crankcase ventilation system became inoperative (plugged). explain what might happen in the crankcase if this were to happen
The crankcase would become pressurized and oil leakage past seals and gaskets could occur. The oil may become contaminated with an acid, water and fuel build up
Can you replace just one oil pump gear
No. Oil pump gears should be changed in sets of two since the damage/wear on one will be reflected on the mate
What are six factors that may cause excessive oil consumption
Oil viscosity too low for the operating temperature, oil dilution with diesel fuel, worn piston rings and cylinder liners, engine operation under conditions of low operating temperature and low load, leakage at seals and gasket due to loose fasteners and/or excessive combustion pressures in the crankcase, pressure regulating valve stuck closed
What are possible problems that may be created if the oil level is too high
The oil could foam, high oil temperature due to foam, increased oil consumption if the piston rings cannot control the excess oil on the cylinder liners
Could high oil temperatures happen if metal to metal contact occurs at a bearing or if the oil cooler is defective
Yes
What’s a good definition of pour point
The lowest temperature at which the oil will flow
What’s the purpose of detergents in oil
They prevent deposits from forming on internal engine parts
What’s the purpose of dispersants
Dispersants keep deposits suspended in the oil
Oxidization inhibitors prevent the oil from adsorbing excess oxygen. what will this feature reduce
The build up of varnish and sludge in the oil. they also prevent general corrosion relating to alloy bearing material
How do anti-rust agents work
They help maintain an oil film on the exposed internal engine parts when the engine is not operating
What are five additional additives that are put in oil
Pour point additives,viscosity index improvers, film strength, metal deactivators, foam inhibitors
resistance to fluid flow is:
viscosity
