🔍 Key Concepts

• How plasti-gage is designed to be used on engine bearings • What is actually being measured: oil clearance between journal and bearing • How the plasti-gage manufacturer provides a way to interpret the amount of flattening

💭 Think About

• Think about whether plasti-gage is meant to be measured with precision instruments directly, or compared to something supplied with it • Consider what happens to the rod after it is crushed—what characteristic (thickness vs. width vs. length) is easiest and most reliable to compare for clearance • Ask yourself which method would be the most practical and repeatable for mechanics in the field

✅ Before You Answer

• Notice which answer choices require extra tools like a micrometer or vernier caliper versus something that might be packaged with the plasti-gage itself • Focus on which dimension of the flattened plasti-gage (thickness, width, or length) is actually useful and intended to be matched to a reference scale • Verify from your study materials how the manufacturer’s scale is used with plasti-gage when checking bearing clearances