Answer :
Final answer:
In a pushrod engine, the lifter is the component that moves the pushrod directly. The lifter follows the movement of the camshaft, transferring that motion to the pushrod which in turn actuates the rocker arm. This mechanism is essential for opening and closing the engine's valves.
Explanation:
Understanding Pushrod Engines
In a pushrod engine, the component that directly moves the pushrod is the lifter. The lifter is a mechanism that follows the camshaft's rotation and transfers the motion to the pushrod. As the camshaft turns, the shape of the cam affects the lifter's motion, which in turn pushes the pushrod upward to actuate the rocker arm. The rocker arm then opens and closes the engine's valves.
Component Functionality
Here’s a brief overview of how these components work together:
- Camshaft: Drives the lifters based on its rotation.
- Lifter: Moves in response to the camshaft and pushes the pushrod.
- Pushrod: Transfers the motion from the lifter to the rocker arm.
- Rocker Arm: Opens and closes the valves of the engine.
This sequence ensures that the engine can intake air and fuel, as well as expel exhaust gases, which is crucial for its operation.
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