ROl TUMBLE 1.. NCI NCEUNG JJ 



then with your fist drive the key down as far as you can. 



consider this a peculiar kind of a hammer 

 your boxes will rarely ever heat after being keyed in this 



KNOCK IN ENGINES 



What makes an engine knock or pound? A loose pil- 

 low block box is a good "knocker." The pillow block is a 

 box next to the crank or disc wheel. This box is usually 

 fitted with set bolts and jamb nuts. You must also be 

 nl not to set this up too tight, remembering always 

 a box when too tight begins to heat and this ex- 

 i- journal, causing greater friction. A slight turn 

 of a set bolt one way or the other may be sufficient to 

 cool a box that may be running hot, or to heat one that 

 be running cool. A hot box from neglect of oiling 

 ; >e cooled by supplying oil, provided it has not already 

 comcnced to cut. If it shows any sign of cutting, the only 

 safe way is to remove the box and clean it thoroughly. 



Loose eccentric yokes will make a knock in an engine, 



and it may appear to be in the wrist. You will find pack- 



f>etween the two halves of the yoke. Take out a 



thin sheet of this packing, but don't take out too much, 



as you are liable then to get them too tight and they may 



stick and cause your er We will have 



e to sav about the slipping of the eccentrics later on. 



If the piston rod is loose in the cross-head it will make 



