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Q3. With reference to main Thrust bearing of the pivoting pad type, explain with sketches where necessary

a) The principle of operation of the bearing

b) The critical clearances and why they are critical?

c) How these clearances are adjusted

d) Why such bearings sometime overheat although the clearances are adequate?

e) How is the lubrication film between faces of collar and thrust pad maintained?

Q9. (a) Why is the axial clearance of a main thrust bearing an important dimension? (6)

(b) How is this clearance measured? (6)

(c) Describe how the thrust pads are removed for inspection and state what you would look for in particular. (4)

Q3. a) Describe with the aid of a sketch the construction of a single collar thrust bearing. (6)

b) Explain the principle on which it works. (5)

c) Explain how you would take the essential clearances and explain the significance of them. (5)

Q7.a) What is the purpose of the main thrust bearing?

b) When checking the main thrust bearing, what dimensional checks would be necessary?

c) How is a thrust bearing cooled?

d) Describe, with a sketch, the special chocking arrangements normal to thrust bearing.

Q2.a) Explain the function of thrust bearings in marine engines and why they are critical for the propulsion system. Define the roles of ahead and astern thrust bearings in marine propulsion systems. Why is it essential to have both types of thrust bearings in a ship’s main engine setup. (8)

b) Explain how the ahead and astern thrust bearings handle the directional thrust generated by the propeller. Discuss the procedures for monitoring their condition and ensuring they are adequately supporting the load in both operational directions. (8)