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For what purpose a small quantity of fuel is purposely allowed to mean between the nozzle valve and its guide?

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in Automotive Engine Design by (137k points)
For what purpose a small quantity of fuel is purposely allowed to mean between the nozzle valve and its guide?

(a) To control the temperature

(b) To control the pressure

(c) To lubricate

(d) To keep a check-in entropy

The question was asked during an interview.

My question is from Diesel Engine Fuel Supply System topic in chapter Diesel Engine Fuel Supply System of Automotive Engine Design

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The correct option is (c) To lubricate

Easy explanation: A small quantity of fuel is purposely allowed to leak between the nozzle valve and its guide for lubrication purposes. The fuel accumulated around the spindle In this way is drained back to the fuel tank through the leak-off connection.

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