Belt drives

Question 1

What is the function of a timing belt?

Answer 1

• Precisely synchronizes the rotation of the crankshaft and camshaft
• Ensures valves open at the correct time in relation to the piston

Question 2

What is the function of a serpentine belt?

Answer 2

Uses a series of pulleys to transfer power from the crankshaft to other engine accessories:
- water pump
- alternator
- power steering pump
- AC compressor

Question 3

What are the pros belt drives have over gears?

Answer 3

• No lubrication required: simpler maintenance
• Lower cost: cheaper to manufacture and replace
• Quiter operation: rubber absorbs noise

Question 4

What are the differences between a timing belt and serpentine belt?

Answer 4

Timing belt:
- Has horizontal teeth that mesh with crankshaft and camshaft gears
- Made of fibreglass-reinforced rubber, making it stronger

Serpentine belt:
- Contains V-shaped grooves
- Made of rubber or synthetic materials

Question 5

What are cons belt drives have over gears?

Answer 5

• Slippage: Not ideal for precision timing or constant-speed applications
• Lower efficiency: Power lost due to slippage
• Shorter lifespan: Belts wear out faster

Question 6

What are the steps to replacing a belt?

Answer 6

1. Ensure engine is off and cooled
2. Take picture of belt arrangement for reference
3. Access belt and remove any components obstructing it
4. Use a ratchet to rotate tensior to relive tension
5. Carefully remove old belt off the pulley
6. Install new belt and re-engage the tensioner to a apply proper tension to the belt