LUBRICATION AND ADJUSTMENT OF BEARINGS 5! 



the jam nut at the bottom and turning the head of the bolt, 

 which will raise the wedge,, and crowd the two halves of 

 the box together. The proper adjustment may be made 

 by drawing up the wedge a little at a time, trying it each 

 time by moving the rod sideways on the crank pin with the 

 hand until tight ; then back off the bolt a trifle. Another 

 very satisfactory method is to tighten the bolt until it firmly 

 resists further tightening and then loosen it a known 

 amount, which should be about one-third of a turn. 



FIG. 14. THE CONNECTING-ROD. 



When the halves of the brasses touch, they must be 

 taken out and filed. To take out the brasses for filing, 

 remove the connecting rod in the following manner : Turn 

 the engine so that the cross-head pin comes opposite the 

 hole in the engine frame nearest the crank. Take off the 

 washer on the crank pin and remove the grease cup and 

 the nut from the cross-head pin. Drive the cross-head pin 

 out with a wood block, turn the engine on rear dead center, 

 and the connecting-rod may be lifted off. Set the wedges 

 down as far as they will go, and take out the adjusting 

 bolts. The wedge and half of the box next to it may be 

 driven out from the inner side with a wood block. Before 



