AG Mechanics CDE Practice Exam

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Prepare for the AG Mechanics CDE Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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What is the machined hole in the block that the valve stem passes through to align the valve called?

Valve guide
Valve lifter
Valve seat
Valve spring

The correct answer is: Valve guide

The machined hole in the block that the valve stem passes through to align the valve is called the valve guide. The valve guide plays a crucial role in ensuring the proper alignment and movement of the valve during engine operation. It helps to guide the valve stem accurately, allowing for smooth and precise opening and closing of the valve. This component is essential for maintaining the proper function and performance of the engine's valves. Option B, valve lifter, is incorrect because valve lifters (also known as tappets) are components that are responsible for transmitting the motion of the camshaft to the valve. Option C, valve seat, is incorrect as the valve seat is the surface against which the valve seals when closed. Option D, valve spring, is incorrect because valve springs are responsible for closing the valves after they've been opened by the camshaft.