🔍 Key Concepts

• Trace the fuel camshaft location first – it will be in line with the fuel pumps that operate the fuel valves. • Remember that a gear drive housing will enclose the gears that transmit motion from the crankshaft up to the camshaft, usually low on the engine side. • Look for the letter that is attached to a bulged or boxed casting on the engine side where rotating gears would reasonably be located, not to small fittings or valves.

💭 Think About

• Which letter is closest to the side of the engine where the camshaft and fuel pump drive linkage are shown? • If the crankshaft is at the very bottom, where would the gears need to be placed to transfer its rotation to the camshaft that operates the fuel pumps? Follow that mechanical path. • Which of the labeled letters is attached to a component big enough to contain several gears, rather than just a single valve or small accessory?

✅ Before You Answer

• Confirm you have identified the crankshaft and then follow up to find the camshaft and its drive train. • Eliminate letters that clearly point to small external fittings (like indicator cocks, valves, or eyes) and not to a gear case or housing. • Make sure the letter you choose is on a casting that appears to be bolted or flanged closed, typical of a gear drive housing that needs periodic access for inspection.