🔍 Key Concepts

• Speeder spring function in a mechanical diesel engine governor (it provides the reference force that balances the flyweights). • What happens to fuel rack position when the governor suddenly loses speeder spring force at high speed and full load. • Difference between normal governor action and an independent overspeed trip device.

💭 Think About

• Picture the flyweights and speeder spring in balance at full-load speed. If the speeder spring force suddenly goes to zero, which way will the flyweights move, and does that movement command more fuel or less fuel? • Under full load, if fuel is suddenly increased, what happens to RPM? If fuel is suddenly decreased, what happens to RPM? Match that effect with the most logical choice. • Does a broken speeder spring make the governor keep controlling speed smoothly, or does it effectively remove its ability to hold the original set speed?

✅ Before You Answer

• Be clear on whether loss of speeder spring force will drive the fuel rack toward maximum or minimum fuel. • Ask yourself if an overspeed trip is normally activated by more fuel or less fuel being sent to the engine. • Consider whether true speed hunting can occur if the basic speed-setting element (the speeder spring) is no longer intact.