Question 38Motor Plants - 1st Asst/Chief

You are correct, the answer is B) lube oil consumption. In a four-stroke cycle diesel engine, badly worn intake valve guides can cause excessive lube oil consumption. This is because the worn valve guides allow engine oil to leak past the valves and into the combustion chamber, resulting in higher oil consumption. The other answer choices are incorrect - worn valve guides would not directly affect cooling water temperatures, exhaust pressure, or exhaust temperatures.