🔍 Key Concepts

• Note the label on the instrument body that reads Diesel Indicator and think about what an engine indicator is used for on slow-speed and medium-speed diesels. • Consider whether this tool would be temporarily fitted to an indicator cock on the cylinder head, or permanently piped into a manifold. • Think about which engine condition requires you to see pressure changes throughout the entire stroke of the piston, not just a steady manifold pressure.

💭 Think About

• Ask yourself: Is this device meant to read a continuous, steady pressure in a pipe, or a rapidly changing pressure in the cylinder over each power stroke? • Which of the answer choices involves checking the condition of each individual cylinder during operation or testing, rather than checking a shared system like an intake or exhaust manifold? • If you were diagnosing poor power on one cylinder, which of these measurements would help you compare that cylinder to the others over the full cycle?

✅ Before You Answer

• Verify whether a Diesel Indicator is connected individually to each cylinder via an indicator cock, rather than to a common manifold. • Check which answer choice involves obtaining both compression and firing (combustion) information from inside the cylinder. • Confirm that devices for measuring manifold pressure or turbocharger torque are usually permanently installed, not hand-held, portable instruments like the one shown.