NAMEAUTO 10 STUDY SHEET #12
SECTION Oil Filters and Oil pumps, Engine Bearings and Motor Oil, P46 – 47
Answer in complete sentences.
- What is the function of the oil filter?
The function of the oil filter is to filter out the impurities and by products of combustion from the oil lubricating the engine.
- What is a bypass valve and what is its function?
It is a valve that allows the lubrication system to continue to function if the filter becomes clogged with dirt or sludge.
Were can these parts be located?
On GM vehicles, the bypass valve is built into the oil filter-mounting bracket. Other manufacturers use a bypass valve built into the filter itself.
- What are the two types of oil pumps in engines?
The two types of oil pumps include the gear type and the rotor type.
- What is the approximate oil pressure in an engine, in both Metric and Imperial measurements?
The approximate oil pressure in an engine is 410 kpa or about 60 psi
- Why is a pressure relief valve necessary?
When the oil is cold or when the engine is running at high speeds the pressure relief valve allows the excess pressure to return oil directly to the oil pan.
- What are the two general types of engine bearings?
The two types of bearings are plain bearing and rolling bearings.
- Oil is rated by a number and letter code. The numbers are an indication of
Viscosity (thickness). The letters are an indication of the oils service classification or grade.
- What oil is generally recommended for most engines year round?
A commonly used multi-weight oil is 10W- 30 for year round use.
- Oil never wears out. Why then must we change oil if we can filter out the dirt?
The chemical additives in the oil wear out so that is why you must change oil regularly.
- Many modern small high performance cars use turbochargers. Can you think of any special precautions to protect your investment after you buy one of these cars?
Whenever you purchase a vehicle you should always change the oil as a precaution to protect your investment.
- What is the PCV system?
The letters stand for the positive crankcase ventilation system.
What is its purpose?
It is to allow unburned gases and contaminants to flow back to the intake area to be run through the piston's combustion once again.
- What maintenance is required of the PCV system?
The contaminants are physically removed when you change the oil and all of the filters.
- Why do vehicles now use a PCV system if they didn’t use it before the 1960’s?
New emission concerns caused car manufacturer's to decrease pollution and the PCV system helps to lower harmful byproducts from escaping into the atmosphere.