🔍 Key Concepts

• Construction of large slow-speed diesel engines (bedplate, frame, tie rods, sump) • Function and location of main bearings in relation to the crankshaft • Difference between structural support components vs. fasteners or enclosures

💭 Think About

• Which component directly carries and aligns the crankshaft and therefore must house or support the main bearings? • Among the options, which parts mainly hold things together or close off spaces, and which part forms the primary lower structural foundation of the engine? • Think about where you would physically find the main bearing shells if you were standing next to a stripped-down engine: what are they bolted into?

✅ Before You Answer

• Be clear on what main bearings support (the crankshaft) and what supports the bearings themselves. • Identify which option is the primary structural base for the crankshaft area in a large slow-speed diesel. • Verify which parts are mainly fastening or closing components rather than bearing supports.