When driving downhill, which of the following should be done to prevent engine damage?

Lowering downhill speed to below maximum RPM is a crucial practice for preventing engine damage. When driving downhill, the engine can face excessive strain if the RPMs climb too high, potentially leading to overheating or mechanical failure. By reducing speed, the engine operates within a safer RPM range, allowing it to function effectively without being over-revved.

This approach also assists in maintaining better control of the vehicle as it descends, which is essential in emergency response situations where precision and safety are paramount.

Moreover, coasting out of gear can lead to a lack of engine braking, increasing the risk of speeding and reducing control, while limiting downhill speed to lower than minimum RPM doesn’t pertain to typical operational procedures and could be unsafe. Stopping the apparatus frequently can be impractical and may compromise response times during emergencies. Thus, managing speed effectively while ensuring the engine stays within a safe RPM limit is critical for vehicle safety and longevity.