TAKING OUT CYLINDER LINERS ARE NOT SOMETHING WHICH WE COME ACROSS DAILY. MODERN LINERS HAVE LONG RUNNING HOURS AND MATERIAL USED TO MAKE THESE LINERS IS ” TARKALLOY” WHICH DO NOT WEAR EASILY.
REMOVAL OF LINERS FOR RENEWAL OR TO CHANGE THE O-RINGS OF WATER JACKET IS NOT A CURB-SOME ISSUE UNTIL ITS SEIZE TO COME OUT. SEIZING OF LINERS IS BASICALLY DUE TO THE O-RINGS GETTING JAM INSIDE ITS GROOVE WHICH ARE PLACED IN LINERS TO STOP WATER LEAKAGE FROM THE CYLINDER JACKET. THE O-RINGS MAY GET JAM IF THERE PREVIOUSLY AN OVERSIZE O-RING HAS BEEN USED OR THE GROOVES WERE NOT CLEANED BEFORE PUTTING THE LINER BACK PREVIOUSLY OR DUE TO SLUG FORMATION AROUND THE O-RINGS.
WHILE TAKING OUT THE LINER, THE OVERHEAD CRANE SHOULD BE MOVED UP SLOWLY SO AS TO CHECK WHETHER THE LINER IS COMING FREELY OR NOT. IF ITS NOT FREE THEN NOT IN ANY CASE THE CRANE TO BE MOVED UP AS IT WILL EXERT EXCESSIVE PRESSURE ON O-RING AND ITS FROVE AND IT MAY HAPPEN THAT THE GROOVE MAY GET DAMAGE.
IN THIS CASE, HYDRAULIC JACKS ARE PLACED BELOW THE LINERS. THE STUFFING BOX AREA HAS A FLAT SURFACE PROVIDED WHERE THESE HYDRAULIC JACKS ARE PLACED AND A SMALL JACKING UP IS DONE. THIS HELP IN LIFTING THE LINER AND MAKE THE O-RING OUT OF ITS PLACE AND NOW LINER CAN BE LIFTED UP.