In lesson 5 of our 12 lesson series on Auto Maintenance and Repair, we discuss the internal combustion engine and engine oil. The Otto Cycle of events is discussed, as well as the API and SAE grading codes for engine oil.

1. Free Classes on Auto
Repair & Maintenance
Lesson 5: The Internal Combustion Engine & Engine Oil
Jeff Crawford
Crawford’s Auto Repair

2. The Internal Combustion Engine
 The Otto Cycle of Events
◦ Intake
◦ Compression
◦ Combustion
◦ Exhaust

3. The Internal Combustion Engine
 C:Crankshaft
 E: Exhaust
Camshaft
 I: Inlet
Camshaft
 P: Piston
 R: Connecting
Rod
 S: Spark Plug
 V:Valves
◦ red: exhaust
◦ blue: intake
 W:Cooling
Water Duct

4. The Internal Combustion Engine
 Connecting Rods and Camshaft Rotate
and provide input to the transmission,
then to the drive train, then to the wheels
(later lesson)
 Animation at:
http://commons.wikimedia.org/wiki/File:C
shaft.gif

5. The Internal Combustion Engine
 Watch Video of Otto Cycle:
http://www.youtube.com/watch?v=6qHhe
rIwsTE

6. The Internal Combustion Engine
 http://youtu.be/Onqi9iRpFYE

7. The Internal Combustion Engine
 This lesson is important to know for the
following four lessons:
◦ The Cooling System
◦ The Fuel System
◦ The Electrical System
◦ The Drivetrain

8. Engine Oil
 API Code
 SAE

9. Questions?

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