🔍 Key Concepts

• Difference between measuring clearance vs. marking contact surfaces • Which tool can indicate very small gaps between round, closely fitted parts like bearings and crank journals • Common engine shop practices for checking bearing-to-shaft fit

💭 Think About

• Ask yourself: which item in the list is specifically designed to be deformed or changed in a controlled way so you can read the clearance afterward? • Which choice is actually used as a measurement aid, not just for fitting, bluing, or packing? • Which device would realistically fit between a bearing shell and the crankshaft journal while the bearing cap is tightened?

✅ Before You Answer

• Verify which option is a soft, calibrated material that squashes to show clearance • Eliminate any items that are mainly used for marking high spots or checking contact area, not for direct clearance measurement • Check which tool is specifically mentioned in engine overhaul manuals for checking main and connecting rod bearing clearances