🔍 Key Concepts

• Location and function of a camshaft in a V‑type diesel (what mechanical parts it works with in the head/block) • Speed relationship between crankshaft and camshaft in a four‑stroke vs two‑stroke engine • How the gear train or drive at the front of the engine changes speed between crankshaft and camshaft

💭 Think About

• From the illustration, which labeled shaft clearly operates the valve and fuel injection cams? Trace which one has cam lobes and followers going up toward the valves. • Is this engine operating on a four‑stroke or two‑stroke cycle based on the presence of intake and exhaust valves in each head? How does that determine the camshaft speed relative to the crankshaft? • Look at the gear sizes between the crankshaft and the suspected camshaft: do they indicate the driven shaft is running at the same speed or at half speed?

✅ Before You Answer

• Verify which label is attached to the shaft with cam lobes and followers leading to the valve gear and fuel pumps. • Confirm whether the engine cycle shown is four‑stroke (camshaft = 1/2 crankshaft speed) or two‑stroke (camshaft = crankshaft speed). • Double‑check that the chosen option correctly pairs both the physical shaft label and the correct speed ratio to the crankshaft.