AG Mechanics CDE Practice Exam 2025 – The Comprehensive All-in-One Guide for Success

Question: 1 / 400

Valve tappet clearance is measured by using a:

caliper

Valve tappet clearance is typically measured using a feeler gauge. A feeler gauge is a tool made up of several small lengths of steel of varying thickness, used to measure small gaps in machinery. When checking valve tappet clearance, the feeler gauge is inserted between the valve stem and the tappet to determine whether the gap is within the proper specified range. Using a caliper, micrometer, or ruler would not provide an accurate measurement for valve tappet clearance as these tools are not designed for this specific type of measurement in an engine.

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feeler gauge

micrometer

ruler

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