HEATING OF JOURNALS.
The heating of journals and reciprocating parts of an engine may be attributed to the following causes:
Improper proportions and fitting, unsuitable material, want of homogeneity between the metals of which the journals and bearings are composed, the revolving or reciprocating parts not being in line, the boxes being keyed up too tight, sand or grit getting into the journals, improper lubricating, etc. The last mentioned cause is very complicated, as the conditions of weight of load, area of surface subject to pressure, velocity of movement, etc., must be taken into consideration.
To remedy the heating of journals which is caused by the revolving or reciprocating parts not being in line, the engine or shaft must be put in line.
When caused by the boxes or bearings being too tight, they must be loosened a very little at a time until bearings run cool. Apply plenty of good oil.
Clean the boxes and journals thoroughly, and see that the oil holes are not stopped up; also see that the oil-cups are clean, to assure of the oil getting to the bearings freely.
Oiling frequently, using a little oil at a time, gives the best results and is the most economical.