Question 119Motor Plants - QMED

The correct answer is B) pressurize the lube oil system with the pre-lube pump. Before starting a diesel engine with an engine-driven lube oil pump, it is important to pressurize the lube oil system using the pre-lube pump. This ensures that the engine bearings and other critical components are adequately lubricated before the engine is started and the engine-driven pump begins circulating the oil. Failure to pre-lube the system could result in bearing damage or failure upon startup. The other options are incorrect because: A) topping off the expansion tank does not pressurize the lube oil system, C) opening the bypass line would bypass the lube oil system, and D) cutting in the lube oil cooler does not directly pressurize the system.