The crank pin is another name for the connecting rod journal.

The crank pin is another name for the connecting rod journal.

• A. Main bearing cap
• B. Camshaft journal
• C. Connecting rod journal
• D. Wrist pin

Answer: (C)

The crank pin is the bearing surface on the crankshaft that the connecting rod rides against, which is called the connecting rod journal. This journal provides the offset from the crank center that converts the piston’s up-and-down motion into crankshaft rotation as the crank turns. The main bearing cap holds the main bearings for the crankshaft, not the off-center journal where the rod attaches. The wrist pin is the piston pin that connects the piston to the connecting rod, not the crank surface. The camshaft has its own journals, separate from the crankshaft. So the crank pin and the connecting rod journal are the same feature.

The crank pin is the bearing surface on the crankshaft that the connecting rod rides against, which is called the connecting rod journal. This journal provides the offset from the crank center that converts the piston’s up-and-down motion into crankshaft rotation as the crank turns. The main bearing cap holds the main bearings for the crankshaft, not the off-center journal where the rod attaches. The wrist pin is the piston pin that connects the piston to the connecting rod, not the crank surface. The camshaft has its own journals, separate from the crankshaft. So the crank pin and the connecting rod journal are the same feature.