Chapter 49 PowerPoint

Define these Technical Terms using the textbook:

1. oil filter

2. engine oil

3. lubrication system

4. multi-viscosity oil

5. oil level sensor

6. oil pan

7. oil pickup

8. oil pressure gauge

9. oil pressure sending unit

10. oil pump

11. synthetic oils

12. positive crankcase ventilation system

Answer these discussion questions using the textbook:

1. List the basic parts of a lubrication system.

Read the chapter summary below:

■ The lubrication system forces oil to high friction points in the engine to protect moving parts from friction, wear, and damage.

■ Engine oil, also called motor oil, is needed to keep moving parts in an engine from making direct contact.

■ A friction bearing, also called plain bearing, has two smooth surfaces sliding on each other.

■ An anti-friction bearing uses balls or rollers to avoid a sliding action between the bearing surfaces.

■ Oil viscosity, also called oil weight, is the thickness or fluidity (flowability) of the engine oil.

■ Multi-viscosity oil, or multi-weight oil, will exhibit operating characteristics of a thin, light oil when cold and a thicker, heavier oil when hot.

■ An oil service rating is a set of letters printed on the oil bottle to denote how well the oil will perform under operating conditions.

■ The oil pickup is a tube extending from the oil pump to the bottom of the oil pan.

■ The oil pump is the “heart” of the engine lubrication system it forces oil out of the pan, through the engine filter, galleries, and to the engine bearings.

■ 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.

■ An oil filter removes small metal, carbon, rust, and dirt particles from the engine oil. It protects the moving engine parts from abrasive wear.

■ Oil galleries are small passages through the cylinder block and head for lubricating oil.

■ An oil pressure switch is opened and closed by oil pressure so that it can operate the dash oil pressure indicator light.

■ An oil pressure sending unit uses a variable resistor to operate the oil pressure gauge and the warning light.

■ Variable camshaft timing allows engine oil pressure to operate hydraulic camshaft phaser sprockets and other hydraulic actuators in the valvetrain. This allows for more optimum engine performance, reduced emissions, and increased fuel efficiency.