Chapter 15 PowerPoint

Define these Technical Terms using the textbook:

1. belt tensioner

2. camshaft drive

3. crankshaft pulley

4. harmonic balancer

5. timing belt

6. timing chain

7. timing gear

8. timing marks

Answer these discussion questions using the textbook:

1. List the three types of camshaft drives.

Read the chapter summary below:

■ The typical engine front end assembly consists of the parts that attach to the front of the engine.

■ Harmonic vibration is a high-frequency movement resulting from twisting and untwisting of the crankshaft.

■ A vibration damper, also called a harmonic balancer, is a heavy wheel mounted in rubber to control harmonic vibration.

■ The crankshaft pulley operates belts for the alternator, water pump, and other units.

■ Timing gears are two gears that operate the engine camshaft.

■ A timing chain and sprockets can be used to turn the camshaft.

■ A chain guide may be needed to prevent chain slap.

■ A chain tensioner may be used to take up slack as the chain and sprockets wear.

■ A front oil seal prevents oil leakage between the crankshaft and front cover.

■ A timing belt mechanism basically consists of a crankshaft sprocket, camshaft sprocket, timing belt, and belt tensioner.