Title: Explain the principles of lubrication in a small engine.
Course: Small Engine Repair (20110-36) > Section: Servicing the Lubrication System

Explanation should include

- defining friction and how it affects the internal engine components
- the function of lubricating oil
- the difference between the lubrication systems of two-cycle and four-cycle engines
- the operation of ejection pumps, barrel pumps, and positive displacement pumps
- the function of the three main types of oil filter systems.

Process/Skill Questions:

- What are the qualities of lubrication oil?
- What does SAE stand for? What is SAE viscosity grade? Why is this important information when servicing a small engine?
- What is the API engine oil service classification?
- How does one select the proper engine oil?
- What are four important jobs performed by engine lubricants?