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CURRENT RECTIFICATION 325
(169) Never directly apply water to cool down a hot bearing unless you want additional trouble. (170) Sometimes when a moderate bearing heat develops, a change to a different oil, heavier or lighter, will correct the trouble. However the better plan is to keep the machine running, flooding it with a not-too-heavy oil, meanwhile putting cold applications on the outside of the oil well. Cloths wrung out of cold water should soon reduce the temperature so that the machine can be shut down without danger of the bearing and journal ''freezing'' together.
(171) When a bronze bearing in a new machine runs hot it is in danger of "freezing" to the shaft if the machine is immediately shut down and this means the bearing must be turned or chopped off the shaft and a new one installed.
Permissible Temperatures
(172) The fact that parts of a motor or generator feel uncomfortably hot to the touch does not necessarily indicate trouble. Every room in which motors and generators are located should be equipped with a reliable thermometer having, by preference, both Centigrade and Fahrenheit scales, the latter reading not less than 200 degrees.
(173) The standard regulations of the American Institute of Electrical Engineers permit a maximum temperature of 90 degrees Centigrade, which equals 194 degrees Fahrenheit, for motors and generators and any part thereof. Since the human body, ordinarily, has a temperature of about 98 degrees, a motor or generator part may feel very hot to the touch, though still at safe operating temperature. This feeling of danger is particularly true when on a hot day the perspiring hand is laid against any metal part of the set.
Measuring Motor Temperature
(174) Bed the thermometer ball in stiff putty, then bed the putty on the part to be measured, leaving it in contact for an ample time so the putty will heat fully