If a turbocharged engine is in use, when may you open the Main Battery Knife Switch after shutdown?

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Multiple Choice

If a turbocharged engine is in use, when may you open the Main Battery Knife Switch after shutdown?

Explanation:
When a turbocharged engine is shut down, the turbocharger and its bearings need time to cool while oil continues to circulate. The turbo’s auxiliary oil pump keeps circulating oil to cool and lubricate the bearings even after the engine is off, so opening the main battery knife switch too soon cuts off this cooling flow and can damage the bearings. Waiting about 35 minutes lets the auxiliary pump finish cooling the bearings before power is removed, making this the correct procedure.

When a turbocharged engine is shut down, the turbocharger and its bearings need time to cool while oil continues to circulate. The turbo’s auxiliary oil pump keeps circulating oil to cool and lubricate the bearings even after the engine is off, so opening the main battery knife switch too soon cuts off this cooling flow and can damage the bearings. Waiting about 35 minutes lets the auxiliary pump finish cooling the bearings before power is removed, making this the correct procedure.

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