For engines equipped with a governor, what should be verified during post-overhaul checks?

For engines equipped with a governor, what should be verified during post-overhaul checks?

• A. The governor should be disabled during operation.
• B. The governor responds correctly to throttle input and maintains target speed.
• C. The governor controls oil temperature.
• D. The governor affects only cold starting.

Answer: (B)

Governors regulate engine speed by sensing RPM and automatically adjusting fuel delivery to hold the engine at a pre-set speed. In post-overhaul checks, you want to confirm that this control loop is working: moving the throttle should cause the engine speed to respond, and once a new speed is set, the governor should automatically compensate for changes in load to keep that target speed steady. If the speed wanders, hunts, or cannot be brought back to the set point, the governor linkage, calibration, or sensing mechanism likely needs adjustment. This is why checking response to throttle input and stable maintenance of the target speed is the best indicator of proper governor function. Disabling the governor would defeat its purpose, oil temperature isn’t governed by this system, and the governor isn’t restricted to influencing only cold starting.

Governors regulate engine speed by sensing RPM and automatically adjusting fuel delivery to hold the engine at a pre-set speed. In post-overhaul checks, you want to confirm that this control loop is working: moving the throttle should cause the engine speed to respond, and once a new speed is set, the governor should automatically compensate for changes in load to keep that target speed steady. If the speed wanders, hunts, or cannot be brought back to the set point, the governor linkage, calibration, or sensing mechanism likely needs adjustment.

This is why checking response to throttle input and stable maintenance of the target speed is the best indicator of proper governor function. Disabling the governor would defeat its purpose, oil temperature isn’t governed by this system, and the governor isn’t restricted to influencing only cold starting.