Q6. A. Describe how a crank pin bearing of a 2 stroke main propulsion engine is opened up for inspection;
B. Which half of the bearing is subject to greater wear?
C. What are the various causes of wear down of the bearing.
Q1. Explain why auxiliary engine bottom-end bolts are prone to failure, even under normal running conditions. Identify those features, incorporated into the design of bottom-end bolts, to inhibit failure. Explain how this tendency is either aggravated or inhibited during maintenance and what checks are to be carried out.
Q7. Fatigue is one of the main causes of crankshaft failure - A. Indicate on a sketch the most likely location of a fatigue crack; B. Explain how a fatigue failure is identified; C. Describe how a fatigue crack may be initiated; D. Describe, with the aid of sketches, the methods used to inhibit fatigue cracks.
Q5. A. Briefly describe any one of the manufacturing process involved in semi built or welded construction of crankshaft of large marine engine; B. Give a composition of material used; C. Draw a stress diagram for stress in web of a crankshaft.
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