SEIZURE OF PISTON INSIDE THE LINER IS CAUSED BY THE PISTON RINGS GETTING STUCK WITH THE LINER. THIS IS CAUSED DUE TO VARIOUS REASONS :-
- TAKING OUT THE PISTON OUT OF THE LINER WITHOUT CLEANING THE LINER FROM CARBON.
- TAKING OUT THE LINER WITHOUT TAKING OUT THE ANTI-POLISHING RING OUT FIRST. WHILE TAKING OUT THE PISTON RINGS GET STUCK ON ANTI-POLISHING RING AS ITS INNER DIAMETER IS SLIGHTLY LESS THAN LINER INNER DIAMETER.
- IN CASE OF INSTANTANEOUS STOPPING OF ENGINE.
TAKING OUT THE STUCK PISTON IS DIFFICULT BUT CAN BE DONE BY FOLLOWING WAYS:-
- COOLING THE PISTON WITH THE HELP OF LIQUID NITROGEN IF AVAILABLE WHICH WILL CONTRACT THE PISTON AND RINGS AND PISTON WILL COME OUT.
- A HYDRAULIC JACK IS PLACED BELOW THE ROD AND JACK IS FORCED UP LEADING TO JACKING UP OF PISTON.
- PISTON RINGS ARE DRILLED OUT BY THE HELP OF SPECIAL FINE DRILL AND RINGS ARE BROKEN. THEN THE PISTON CAN BE TAKEN OUT.
IF WE HAVE TO RUN THE ENGINE AND THE PISTON IS NOT COMING OUT THEN WE HAVE TO TAKE THE LINER OUT ALONG WITH PISTON AND NEW LINER AND PISTON HAVE TO FITTED. (NORMALLY EVERY SHIP HAVE A SPARE LINER AND PISTON. IT IS A MINIMUM CRITICAL SPARE WHICH HAS TO BE THERE ONBOARD.)