sixth semester

Cylinder liners will 1 in service. Correct operation of the engine (not overloading, maintaining correct 2 temperatures) and using the correct grade and quantity of cylinder oil will all help to the life of a cylinder liner. Wear rates 4 , but as a general rule, for a large 5 engine a wear rate of 0.05mm/1000 hours is acceptable. The liner should be replaced as the wear approaches 0.8 - 1% of liner diameter. The liner is 6 at regular intervals to ascertain the wear rate. As well as corrosive attack, wear is caused by 7 particles in the cylinder (from bad filtration/purification of fuel or from particles in the air), and scuffing (also known as adhesive wear). Scuffing is due to a breakdown in lubrication which results in localised 8 between points on the rings and liner surface with 9. tearing of micro- scopic particles. This is a very 10 form of wear.