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.