Damages of marine motors are influenced by the following factors:- (1) Design, material and construction. (2) Installation and surroundings. (3) Working conditions. (4) Inspection and repairs. Marine motors are generally installed in unfavourable conditions, namely in high temperature, high humidity, heavy vibration and so forth, and liable to suffer damages. The working conditions, investigated on several ships, show that their motors run in moderate loadings. When a damage arises on a motor, we must research and eliminate its cause, and it is necessary to record its details completely for future reference. Damages on insulation and bearings occur more frequently on marine motors than in the case of land motors. Motors for cargo winches and for ventilating fans sustain damage most frequently than for other uses.
