Q4
During the overhaul of medium-speed auxiliary diesel generator you find that the white metal of one of the bottom end bearings has cracked. Explain how you would fit a spare bearing and enumerate the various tests you would carry before putting the machine back into service.
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Reference Answer
### Introduction The discovery of a cracked white metal bottom end bearing in a medium-speed auxiliary diesel generator is a critical defect requiring immediate and meticulous attention. The white metal (or Babbitt metal) is a soft sacrificial layer designed to protect the harder steel crankpin journal. Cracking can be caused by fatigue, overloading, poor bonding, lubrication failure, or corrosion. The following procedure outlines the surveyor-grade methodology for replacing the bearing and recommissioning the engine, emphasizing safety, precision, and adherence to manufacturer's standards. A preliminary investigation into the root cause of the failure (e.g., analysis of lube oil, operational data, and inspection of other bearings) should be initiated to prevent recurrence. ### Part 1: Procedure for Fitting a Spare Bearing
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