On a large low-speed main propulsion diesel...

Question 1 of 270705eccefa1bacbc34ba4d475fa

On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an __________.

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Question 1 of 27070

On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an __________.

🔍 Key Concepts

• Main bearing wear measurement on large slow-speed diesel engines • Difference between precision displacement measurement tools (e.g., dial indicators) and clearance/settlement measuring tools used on engine beds • How wear is checked between the crankshaft and main bearing saddles without dismantling the engine

💭 Think About

• Think about which tool can span across the crankcase or bearing housing to show how much the crankshaft has settled downward over time. • Ask yourself: in practice, how do engineers record small changes in vertical position of the crankshaft relative to a fixed reference on the engine block? • Consider which option is specifically designed as a rigid reference bar or frame, not a handheld point-to-point measuring device.

✅ Before You Answer

• Which tool is commonly used with feeler gauges or calibrated scales to read crankshaft settlement? • Which option is designed to provide a fixed reference across the bearing supports, rather than just measure between two small points? • Eliminate any tools that are mainly for round stock diameter measurement or general straight-line distance rather than settlement of a shaft in its bearings.