Question 213Motor Plants - 1st Asst/Chief70% to pass
After stopping a diesel engine with a high main bearing temperature, what is the time one needs to wait before a diesel engine crankcase can be opened?
AI Explanation
The correct answer is B) Not less than 30 minutes.
After stopping a diesel engine due to a high main bearing temperature, it is recommended to wait at least 30 minutes before opening the crankcase. This is to allow the engine and its components to cool down sufficiently, as the bearing surfaces and oil may still be very hot immediately after shutdown. Opening the crankcase too soon could result in the release of hot oil or steam, posing a safety hazard. The 30-minute waiting period helps ensure the engine has had enough time to cool, making it safe to access the crankcase and perform any necessary inspections or maintenance.
The other options are incorrect because 15 minutes may not be enough time for the engine to cool down adequately, while 60 and 120 minutes are longer than the recommended 30-minute waiting period.
Related Questions
#211 Which of the following oil mist to air ratios would most likely lead to the most severe crankcase explosion? #212 In the event of a crankcase rich oil mist to air mixture explosion, where the doors are blown off the engine, which of the following may occur after the initial explosion? #214 Which of the following is one of the ways to prevent a scavenging fire on a slow speed diesel engine? #215 Oil in a scavenging air space on a slow-speed diesel engine can be ignited by which of the following? #216 If a scavenging air space fire occurs on a slow speed diesel engine and the engine is stopped, which of the following should be done to prevent distortion due to heat?