1. Check the oil condition for any smell, discoloration, or degradation.
2. Turn the engine to BDC and start checking under the piston rod stuffing box for any sign of black oil, an indication of stuffing box seals or scraper rings leaking from scavenger entablature.
3. Check the piston rod surface for scoring marks and roughness.
4. Check the piston palm bolts and locking device for slackness and fretting.
5. Check the crosshead guide and guide shoe bearing general condition and the area around the frame of guide attachment for any visible cracks.
6. Check that the guide shoe end cover bolts are secure.
7. Check cross head bearing general condition.
8. Evaluate top and bottom end of connecting rod bolt, nut, and locking device for slackness and signs of metal fatigue. (If time permits, the locking plates can be removed to allow a “hammer test" or insertion of feeler gauge)
9. Check web in the area of stress concentration and check tie bolt (bottom side).
10. Check area around main bearing and bearing keep for signs of cracks and particles of white metal, which can indicate possible bearing wiping.
11. Special attention should be paid to the main bearings where any appearance of white metal particles can indicate “spark erosion." This is explained fully in the next section.
12. When checking hydraulically tensioned bolts, look for signs of shiny surfaces on bolt shanks or under nuts, which is indicative of loose bolting.
13. Check the surroundings of the oil pan area of all units for any sludge deposits, and again for pieces of bearing white metals.
14. Check crank case explosion relief door wire mesh (should be wet), spring tension, and sealing ring condition.
15. Ensure oil mist detector sampling pipe and glasses/reflectors are clean to allow clear passage of detecting light.
16. Clear all the foreign materials from the crankcase and make sure all tools used in the inspection are accounted for.
17. Remove the danger notices from the lube-oil pump, then start the pump and check for the oil flow and distribution in all units.
18. Check condition of the crankcase door seals then close and dog the crankcase doors.
19. Inform the chief engineer and duty deck officer that a satisfactory inspection of the crankcase has been completed.
A drawing showing components to be checked follows; please click image to enlarge.