Correct answer
Main journals.
Main journals. They rotate in the block’s main bearings; connecting-rod journals or crankpins are separate surfaces carrying the connecting-rod big ends. Crank webs connect crankshaft regions and counterweights help balance it. Do not confuse the crankshaft journal itself with the surrounding bearing shell.
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The bearing shells, which are the crankshaft surface itself.
The crankpins, which sit in the block’s main bearings.
Main journals.
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