DUQ1-184E Cylinder Liner Calibration

In order to estimate piston running condition and/or determine suitable overhauling interval of cylinder liner, it is very important to understand exact trends of cylinder liner wear. There is a possibility that erroneous liner wear data by an improper measurement leads to a misjudgment about cylinder liner condition.

This Service Information provides tips on the measurement of inside diameter of cylinder liner to obtain reliable liner wear data.

Calibration point of cylinder liner Standard calibration points around upper part of cylinder liner are defined by relative position to the top dead
center (TDC) of piston head. TDC position was determined by the setting of compression shim, so it is varied according to engine rating among same engine type.
In other words, positions of liner calibration points, which are distances from top sealing surface of cylinder liner, are different depending on the thickness of compression shim.