Q6. Give a reasoned opinion as to the accuracy of the following assertions:
a) Absence of oil grooves in the liner wall between the oil supply points results in increased wear of liner and rings.
b) ‘Timed lubrication’ has little merit,
c) The most suitable position of the oil supply point is immediately below the bottom piston ring with the piston at the top dead centre.
Q3. a) Define the following conditions relating to lubricating oil
(i) Oxidation
(ii) Emulsification
(iii) Acidity
b) Explain how each of the conditions in Q3 (a) is controlled by maintenance
c) Suggest possible consequences if the conditions in Q3 (a) change and no corrective action is taken
Q3. State, with reasons, THREE properties required for a cylinder lubricant for a main engine operating on HFO.
(b) Describe, with the aid of a sketches, an electronically controlled cylinder lubrication system, stating how the timing and quantity of cylinder lubricant is regulated and set.
Q8. Compare the desirable qualities of the lubricating oil selected for each of the following duties and give reasons for the differing properties of the oils recommended for these three purposes. (16)
a) Auxiliary diesel engines
b) Stern tube bearings
c) Refrigeration compressors
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