5O SCIENCE OF SUCCESSFUL THRESHING 



cured. A five-cent piece is the right size for the lubricator 

 ordinarily used on the pump and a quarter for the larger 

 sizes. 



Packing the Lubricator. The nut that holds the sight- 

 feed glass must not be screwed up too tightly. If screwing 

 up moderately tight does not stop leakage, put in new gas- 

 kets on both sides of the glass. In repacking the sight- 

 feed glass, first remove every particle of the old packing. 

 Two kinds of gaskets are furnished. Put a soft rubber 

 one next to the glass on both sides and a red fiber one next 

 to the nut. Usually this nut can be screwed up with the 

 fingers tight enough to prevent leaking. The valve stems 

 may be packed with Italian hemp or candle wicking. 



Adjustment of Engine Bearings. In adjusting the 

 bearings of the engine, take up just a little of the lost 

 motion at a time, until the pounding is stopped. Do not 

 attempt to take it all out at once, for in so doing there is 

 risk of heating and cutting. The young engineer often 

 finds it difficult to locate a "pound" in an engine, but an 

 experienced man can usually tell where it is by taking hold 

 of the connecting-rod or eccentric-rod as the engine runs. 

 A good plan, and one that will often show where the 

 trouble lies, is to have a man take hold of the fly-wheel and 

 turn it an inch or so back and forth. By watching the 

 crank-box, cross-head, main bearings and the reverse, any 

 lost motion can be seen. 



The Connecting-Rod Brasses are adjusted by loosening 



