Question 332Motor Plants - Assistant Engineer

The correct answer is B) sulfuric acid corrosion. When diesel engine exhaust gases are cooled below their dew point, the water vapor in the exhaust condenses. This condensation can then absorb sulfur compounds from the exhaust, forming sulfuric acid. This sulfuric acid can then lead to corrosion of the exhaust system components, including the turbocharger. The other answer choices are incorrect because: A) Increased engine back pressure is not a direct result of cooling the exhaust below the dew point. C) Surface pitting of the turbocharger compressor blades is not caused by cooling the exhaust below the dew point. D) Moisture impingement on the turbocharger compressor blading is not the primary issue caused by cooling the exhaust below the dew point.