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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On L-head engines, if the valve tappet clearance is too small, the proper clearance is obtained by:

  1. adjusting the pushrod

  2. grinding on the end of the valve stem

  3. increasing the camshaft lift

  4. refacing the valve

The correct answer is: adjusting the pushrod

If the valve tappet clearance is too small on an L-head engine, adjusting the pushrod is the proper way to obtain the correct clearance. The other options are incorrect because grinding on the end of the valve stem will not always result in the correct clearance and could also damage the valve and seat, increasing the camshaft lift may alter the engine's performance and requires replacement of the camshaft, and refacing the valve would be a time-consuming and unnecessary approach. Adjusting the pushrod is the most efficient and precise method for obtaining the correct valve tappet clearance on an L-head engine.

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