Red Seal Automotive Service Technician Practice Exam

What is the purpose of a timing belt in an engine?

1. To increase engine horsepower

2. To synchronize crankshaft and camshaft rotation

3. To keep the engine cool

4. To improve fuel efficiency

The correct answer is: To synchronize crankshaft and camshaft rotation

The timing belt serves a critical function in an engine by synchronizing the rotation of the crankshaft and camshaft(s). This synchronization is essential for the proper operation of the engine, as it ensures that the intake and exhaust valves open and close at the correct intervals in relation to the position of the pistons. When the timing is accurate, it leads to optimal engine performance, improving efficiency and power output. In contrast, the other options relate to functions that the timing belt does not perform. While horsepower can be influenced by proper engine timing, the primary role of the timing belt itself is not to increase horsepower but to maintain the correct timing between engine components. Similarly, cooling the engine is managed by the cooling system, which consists of radiators and coolant, rather than the timing belt. Lastly, while timing can have indirect effects on fuel efficiency, the primary purpose of the timing belt is synchronization, not directly enhancing fuel economy. Thus, its role in the operation of the engine is fundamental and paramount.