Crankcase inspection

Author: Md Taifur Rahman

Preparation:

  • Tool box meeting carried out.
  • Carry out proper risk assessment and work permit taken
  • Enclosed space entry permit to be taken and enclosed space entry procedure to be followed
  • Inform bridge and put warning notice at ECR
  • Block the starting mechanism and stop L.O pump
  • Open indicator cocks and engage turning gear
  • Propeller clearance taken
  • Turning gear must be operated by only in remote mode
  • All personnel involved should not have any object in their pocket
  • Instrument/tools to be used should be checked and counted

Scope of inspection:

Starting from the top

  1. Check stuffing box arrangement
  2. Ensure locking wires and nuts are intact
  3. Check drain pipe is clear
  4. Check crosshead bearing  for any sign of wiping
  5. Check cross guide shoes for any abnormal sign of scoring
  6. Check lube oil telescopic pipe for any sign of leakage due to loose connection
  7. Check bottom end bearing bolts and nuts for any slackness and sign of wiping
  8. Check crankcase floor and drain filters for any metallic debris present
  9. Check crank web and journal of crankshaft (semi built type) for any sign of slippage comparing to the reference mark provided
  10. Check  main bearing bolts for slackness and sign of wiping
  11. Check tie rods and HDB for slackness
  12. Check OMD sampling cup for blockage
  13. Check transverse girder for any cracks, if any doubt carry out die penetrant
  14. Check crankcase relief valve gauge for dents, wetness and form of clogging
  15. Close all unit crankcase door and start lo pump
  • One at a time open the crankcase door to inspect the oil flow pattern comparing to the other unit. Flow pattern will differ when there is a reduction of LO flow or early sign of bearing failure
  • Check crosshead lube oil piping linkage for leakages if possible
  • For chain gear compartment check the oil spray nozzle for any change in oil flow and the condition of rubber guide and clearance.
  • For thrust block check oil nozzle for clogging and flow pattern.

Source: SMA Classnotes.

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