A cylinder liner is gauged using a ball ended micrometer ,the micrometer should be checked for accuracy by first checking it using a set datum, normally supplied with the engine when built for this purpose. A manufacturers measuring gauge with set positions on it vertically is used in conjunction with the inside micrometer.
Before readings are taken, the temperature inside the liner is taken.The readings are then taken in the port to stbd directions and in fore an d aft directions.To get an accurate reading, the manufacturers gauge is placed in the liner in one of the above positions, then a chalk mark is made in the holes where the micrometer is placed, the gauge is then placed on the opposite side, and the readings are taken using the chalk mark as a reference point.
The " rocking" method is then used to get an accurate reading with the micrometer, ie the micrometer is moved up and down, side to side, until the micrometer is just touching the opposite side from the gauge, the chalk mark aiding this procedure.
Before readings are taken, the temperature inside the liner is taken.The readings are then taken in the port to stbd directions and in fore an d aft directions.To get an accurate reading, the manufacturers gauge is placed in the liner in one of the above positions, then a chalk mark is made in the holes where the micrometer is placed, the gauge is then placed on the opposite side, and the readings are taken using the chalk mark as a reference point.
The " rocking" method is then used to get an accurate reading with the micrometer, ie the micrometer is moved up and down, side to side, until the micrometer is just touching the opposite side from the gauge, the chalk mark aiding this procedure.
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