🔍 Key Concepts

• Identify where the camshaft is located in the illustration and trace what moving parts it directly actuates • Recall that in a typical large two-stroke or four-stroke marine diesel, the camshaft lobes open and close valves and can also drive fuel injection pumps • Note how pushrods and rocker arms connect the camshaft to intake and exhaust valves at the top of the cylinder

💭 Think About

• In the drawing, which components at the top of the cylinder are clearly operated by rocker arms and pushrods coming from below? • Do you see any linkage from the same camshaft area going toward the fuel pump housing on the side of the engine? If so, what function would that timing control? • If one shaft with multiple cams operates several different followers, how many of the listed components could it realistically time at once?

✅ Before You Answer

• Be sure you can physically trace the motion path from the camshaft to each component listed in the choices • Confirm whether the fuel pump plunger movement is tied to a cam lobe on the same shaft as the valve cams • Verify that your choice matches what a main camshaft normally does on a large low-speed diesel: valve operation only, fuel injection only, or both.