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 big, the proper clearance can be obtained by:

  1. grinding on the end of the valve stem

  2. increasing the camshaft lift

  3. precutting the seat

  4. refacing the valve, precutting the seat, lapping the valve

The correct answer is: grinding on the end of the valve stem

If the valve tappet clearance is too big, it means that there is too much space between the valve and the tappet. This is caused by wear and tear over time. Options B and C would not fix this issue as they do not directly address the clearance. Option D involves extensive repairs and would not be necessary for simply fixing the clearance issue. Grinding down the end of the valve stem allows for a smaller gap between the valve and tappet, thus adjusting the clearance to the proper size.

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