Which instrument is used to take crankshaft...

Question 1 of 292185eccefa1bacbc34ba4d475c7

Which instrument is used to take crankshaft deflection readings?

Question 1 of 29218

Which instrument is used to take crankshaft deflection readings?

🔍 Key Concepts

• Purpose of crankshaft deflection measurements in large marine engines • Type of measurement needed: change in alignment/bending between main bearings, not exact diameter • Difference between tools that measure linear displacement vs tools that measure diameter or serve as reference standards

💭 Think About

• Ask yourself: when checking crankshaft deflection, are you measuring the shaft’s diameter or how much the shaft bends/sags between bearings? • Which of these tools is designed to read small movements or positions with a dial indicator rather than to measure inside or outside diameters? • Which option is commonly clamped or set between fixed points to see how much something moves when it is rotated?

✅ Before You Answer

• Identify which tool is specifically used to measure deflection or run‑out rather than size (inside/outside diameter). • Eliminate tools that are primarily used as precision length standards or for checking calibration, not for in‑situ engine measurements. • Verify in your engine room practice or textbooks which instrument is actually placed on the crank webs or between main bearings to record deflection readings in thousandths of an inch or hundredths of a millimeter.