Maintenance and Repairs

Scavenge Inspection

 
 

 

On a two stroke crosshead engine, regular inspection of the scavenge manifold should be carried out. After opening up and following enclosed entry procedures, ensuring that the doors are secured in the open position an entry can be made. Ensure pockets are empty and take in a flashlight, mirror,  bucket of rags, turning gear operating control and a digital camera.

 

 

Generally note the condition of the scavenge manifold and the spaces around the cylinder liners. Ensure that there is no build up of sludge or excessive oil deposits and that the drains are clear.

 

 

 

Check the scavenge relief valves and temperature probes. Check the security of grids and plates. Sight auxiliary blower fan impellors.

 

 

Check the main blower inlet flap valves. These should be free to open and should close when released.

 

The next part of the procedure involves inspection of the piston, rings and liner through the scavenge ports.

 

Turn the engine so that the piston is viewable through the scavenge ports. Inspect the piston skirt for signs of scuffing or abrasion. Inspect the rings for damage and the ring grooves for evidence of carbon build up. These rings are in good condition.

 

Turn the piston down, so that the crown can be inspected. Look for excessive deposits, burning, signs of poor injection, or cracking.

 

 

 

Then look up the liner using the mirror. Look for evidence of corrosion, scuffing or abrasion. Check injector nozzles for leakage and condition of exhaust valve ( hot corrosion). This liner has run 8000 hours and is in good condition.

 

 

When the inspection is complete, ensure all rags, along with other items are removed from the scavenge space. Box up and record inspection findings in ships PM system.

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