🔍 Key Concepts

• Centrifugal governor operation – balance between flyweight force and speeder-spring force determines engine speed setting. • Effect of changing spring compression – moving an adjusting nut or collar changes how much force the spring applies at a given speed. • Difference between normal speed setting, droop, and overspeed trip in a governor/overspeed device.

💭 Think About

• Look at pieces 6 and 10 in the illustration: which one is connected to the speeder spring and which to the flyweight/lever assembly? If you move them closer together, what happens to the spring compression? • If the spring pushes harder against the flyweights at a given rpm, does the engine need to run faster or slower before the flyweights can move the pilot valve to reduce fuel? • Which component in this drawing looks like a separate overspeed trip, and is it being adjusted directly by changing the gap between 6 and 10?

✅ Before You Answer

• Identify whether decreasing the distance between 6 and 10 increases or decreases speeder spring tension at the current setting. • Decide whether that change alters the normal governed speed or a separate function like droop or overspeed trip. • Confirm that the option you choose matches the primary job of the speeder spring in a mechanical diesel engine governor.