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Council Rock South Tech Ed.
Know Your Car
Name: ______________________
Date: ___________
Chapter 41 Review Questions page 769
1. What are the main functions of a lubrication system? Reduces friction and wear between moving
parts; helps transfer heat away from engine parts; cleans the inside of the engine by removing
contaminants; cuts power loss and increases fuel economy; absorbs shocks between moving parts to
quiet engine operation and increase engine life.
2. List and describe the major parts of an engine lubrication system.
1. ENGINE OIL – lubricant for moving parts in engine
2. OIL PAN – reservoir or storage area for engine oil
3. OIL PUMP – forces oil throughout the inside of the engine
4. PRESSURE RELIEF VALVE – limits maximum oil pump pressure
5. OIL FILTER – strains out impurities in the oil
6. OIL GALLERIES – pil passages through the engine
3. How does engine oil protect parts from excess wear?
Engine oil reduces friction and keeps moving parts in an engine from making direct contact.
4. OIL CLEARANCE (bearing clearance) is the small space between moving engine parts for the
lubricating oil film.
5. Explain the difference between friction and antifriction bearings.
Friction bearings have two smooth surfaces sliding on each other. Antifriction bearings use balls
or rollers to avoid sliding action between the bearings.
6. Oil VISCOSITY, also called oil WEIGHT, is the thickness or fluidity of the motor oil.
7. SAE 30 weight oil is thicker and less fluid than SAE 40 weight oil. TRUE or FALSE?
8. What is multi-weight oil? Multiweight oils will exhibit operating characteristics of a thin, light oil
when cold and a thicker, heavy oil when hot. They are more stable than single viscosity oils.
9. Pressure-fed oiling is not commonly used with:
Crankshaft bearings
Camshaft bearings
Hydraulic lifters
Cylinder walls
10. There are two basic types of engine oil pumps: ROTARY and GEAR types.
…continued Chapter 41 Review Questions page 769
11. How does pressure relief valve work? A pressure relief valve limits maximum oil pressure. It is a
spring-loaded bypass valve in the oil pump, engine block, or oil filter housing.
12. Why is an oil filter very important to engine service life? An oil filter removes small metal, carbon,
rust, and dirt particles from the engine oil. It protects the moving engine parts from abrasive wear.
Decomposed oil results from excess heat and mechanical stress. The oil actually changes from a
liquid to a solid, “chocolate pudding-like” substance.
13. Why is an oil cooler sometimes used? An oil cooler may be used to help lower and control the
operating temperature of the engine oil. Oil coolers are frequently used on turbocharged engines or
for heavy-duty applications.
14. OIL GALLERIES are small passages through the cylinder head and block for lubricating oil.
15. Summarize the operation of an oil pressure gauge circuit. An oil pressure gauge circuit uses a
variable resistance-type sending unit. Changes in oil pressure cause different amounts of diaphragm
deflection. This moves the sliding contact on the resistor. Changes in resistance and current make
the gauge show engine oil pressure.
Total _____ / 30