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Q4. Discuss the validity of EACH of the following statements with respect to large slow speed diesel engines: A. Bearing clearances obtained by taking leads (or use of plastic inserts) are fundamentally more accurate than those obtained with the use of feelers;

B. Bearing wear down can be measured by taking deflections; C. A timing chain should be renewed when its slackness causes late fuel injection and exhaust valve operation; D. Timing chain slackness is solely due to stretch of the link plates.