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Q4. (a) describe a method of checking main transmission shaft alignment which does not involve the removal of shaft coupling bolts. (5)

(b) State why the shaft alignment should be checked when the ship is afloat in a light ship condition. (1)

(c) A shaft system is found to be excessively misaligned so as to cause serious bending of the shaft. State what effect this could have on EACH of the following:

(i) the shaft coupling bolts; (1)

(ii) the shaft bearings. (1)

(d) State, with reasons, which of the effects in part (c) would cause the most concern. (2)

Q3. Describe, with the aid of a sketch, the principle of operation of a radial lip stern tube sealing arrangement for an oil filled stern tube, which incorporates an air space and is designed to prevent pollution. (10)

Q3. With reference to main propulsion shaft systems:

(a) describe a method of hydraulic jacking to check bearing loads; (5)

(b) sketch the Bearing Load versus Shift Lift Dial Gauge Reading graph obtained by the method described in part (a), annotating the graph and how the characteristic of bearing load is obtained. (5)