What are the potential consequences of excessively high engine temperatures?

• A. Loss of power, excessive oil consumption, and possible permanent internal engine damage.
• B. Increased fuel efficiency.
• C. No effect on engine performance.
• D. Faster propeller RPM.

Answer: (A)

Excessive engine temperatures cause the engine to overheat, which harms both performance and the engine’s parts. When an engine runs too hot, power tends to drop because combustion and mechanical processes become less efficient and the engine may pull back power to avoid damage. The oil also loses viscosity with heat, so the lubricating film becomes thinner and wear increases; some of the oil may burn or escape past seals, leading to higher oil consumption. If overheating continues, it can cause permanent damage to components such as cylinder heads, pistons and rings, bearings, and valve seats due to excessive expansion, scoring, or seizure. This combination of reduced power, higher oil use, and potential lasting damage is why the described consequences are the correct choice. Higher temps do not improve fuel efficiency, and they do not directly cause faster propeller RPM or leave engine performance unchanged.