What to do in case of piston ring seizure?
lf seizures have been observed, then it is recommended that the cyl. oil dosage is temporarily increased.
- Check Piston Rings for Scratching
Causes or reasons of piston ring scratching:
Scratching is caused by hard abrasive particles originating from the ring itself, or, usually, from the fuel oil. As regards liner and ring wear, the scratching is not always serious, but the particles can have serious consequences elsewhere.
- Check Piston Rings for sticking
lf, due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be visible at port inspection). This indicates lack of sealing, i.e. combustion gas blow-by between piston rings and cylinder liner.
The blow-by will promote oil film breakdown, which in turn will increase cylinder Wear. Sticking piston rings will often lead to broken piston rings.
The free movement of the rings in the grooves is essential, and can be checked either by pressing them with a wooden stick (through the scavenge ports) or by turning the engine alternately ahead and astern, to check the free vertical movement.
