Q5. Discuss the consequences of failure to maintain correct clearances in the case of main diesel engine crankshaft and bottom end bearings. Sketch a bottom end bearing paying particular attention to the arrangement of ensuring uninterrupted flow of oil to the top end bearing.
Q1. (A) Explain how wear on bearing surfaces is effected by each of the following factors:
(i) Dissimilarity of materials in the contact surfaces
(ii) Relative speed of sliding between the surfaces
(iii) Roughness of the surfaces
(iv) incompatibility of lubricant and bearing material.
(b) Describe how each effect may be identified during inspection, Suggest corrective action at either operational or maintenance stages.
Q1. a. In the case of main propulsion engine explain the indications and possible effects which might be expected from-
A. Insufficient bearing clearances; B. Excessive bearing clearances; C. Crankshaft misalignment
b. State the recommended bearing clearances for the bottom end, top end and main bearings of your last motor vessel.
Q9. Describe the developments that have taken place in the design of bearings of slow speed marine diesel engines, focusing on the reasons for such changes. (16)
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)
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