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>> Some of the critical information that you as second / chief engineer should be aware are given in this Synopsis section. I have also included a graph showing how the liner wears over its life span.

>> Cylinder liner gauging report form is shown, this gives you an idea how liner wear is monitored. If time permits you may include a free hand table in your answer sheet.

>> Gauging figures are noted as total wear from original and mean rate of wear since the last recording was made. The pattern of wear over the length of the liner will differ according to engine type but in a single acting, two-stroke engines it tends to be greatest at the top of the stroke adjacent to the combustion space, where pressure and temperature are greatest. This reduces towards the lower end of the stroke but will increase at the exhaust and scavenge ports when relative pressure on port bars is increased and blow past may remove lubricating oil film. The rate of wear varies over the life of the liner. It is high during the initial running-in period after which it should reduce to an almost constant rate for most useful life of the liner. Finally, the rate will progressively increase as wear becomes excessive.

>> Cylinder liners calibration (measuring the inner dia at various height of the liner is both directions) should be done at fixed intervals during overhaul typically 6000-12000 hours to evaluate the liner wear, any damage, scoring, scuffing, corrosion etc. Continuous records of gauging should be tabulated and maintained consistently.

CYLLINDER LINER GAUGUING REPORT FORM