The vessel has its propulsion machinery...

Question 1 / 205eccefa1bacbc34ba4d47180

Question 1 of 205eccefa1bacbc34ba4d47180

The vessel has its propulsion machinery located amidships, using a water lubricated stern tube bearing, to carry a tail shaft of a 15 inch (38.1 cm) diameter. During the inspection the wear between the stern tube and the bearing surface was measured as 1/4 inch (.635 cm). Which of the following actions should be carried out as a result of this measurement?

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🔍 Key Concepts

• Tail shaft and stern tube clearances for water-lubricated bearings • Typical maximum allowable wear as a fraction of shaft diameter for lignum vitae or rubber bearings • Difference between repair actions: replace vs. buildup vs. no action

💭 Think About

• How does the measured clearance (1/4 inch) compare to the shaft diameter (15 inches) as a fraction? Is that within usual marine practice for water-lubricated bearings? • Which component actually wears in a water-lubricated stern tube: the bronze liner on the shaft or the bearing material (like lignum vitae or rubber)? • Would building up a bronze liner versus replacing bearing material be the usual response to EXCESSIVE clearance?

✅ Before You Answer

• Calculate clearance as a percentage of shaft diameter and compare with typical guidance for water-lubricated tail shaft bearings. • Identify which part is designed to be the sacrificial/wear component in this system. • Ask whether a professional surveyor would likely pass this as within limits or require corrective action at next drydocking.

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Question 1 of 20

Pull tail shaft and replace the bronze liner.

Pull tail shaft and replace the lignum vitae.

Pull tail shaft and buildup the bronze liner.

Nothing, as the reading is within the allowable limits.

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Question 1 / 205eccefa1bacbc34ba4d47180

Question 1 of 205eccefa1bacbc34ba4d47180

Back

Question 1 of 20

5eccefa1bacbc34ba4d47180

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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