🔍 Key Concepts

• Study the relative position of the camshaft to the crankshaft and valve train in a four‑stroke diesel. • Trace the fuel pump drive path from the camshaft to the pump plunger and identify where the cam follower actually sits. • Locate the valve adjustment components (rocker arm, adjusting screw, locknut) and compare them with pieces E and K in the illustration.

💭 Think About

• First, decide where the camshaft must be in this V‑type four‑stroke engine and how fast it has to turn in relation to the crankshaft. Does the drawing give you enough information to confirm or deny that? • Look closely at the parts marked E and K: which one is in the valve train, and which one is associated with the fuel injection pump? Think about which component is normally rotated to set valve lash versus injection quantity. • For the fuel pump, ask yourself: is stroke usually changed by turning a small control rod/helix in the plunger, or by moving an external lever or eccentric? What does the shape and connection of piece K suggest?

✅ Before You Answer

• Verify the location of the cam followers: are they directly above the cam lobe, off to the side, or in a different plane altogether? • Confirm which component is clearly part of the rocker arm assembly that would change the clearance between valve stem and rocker when rotated. • Check whether the illustration gives any hint that fuel pump stroke is adjustable externally, or whether only fuel quantity (via a control rack or helix) would normally be adjusted.