88 ROUGH-AND-TUMBLE EN clNG 



Never attempt to dress a valve down, you are most cer- 

 tain to make a bad job of it. 



And yet I don't like the idea of advising you not to 

 do a thing that can be done, for I do like an engineer 

 who does not run to the shop for every little trouble. 

 However, unless you have the proper tools you had best 

 not attempt it. The only safe way is to scrape them 

 down, for if your valve is cut, you will find the valve seat 

 is cut equally as bad, and they must both be scraped to 

 a perfect fit. Provide yourself with a piece of flat steel, 

 very hard, 3x4 inches by about % inch, with a perfectly 

 straight edge. With this scrape the valve and seat to 

 a perfectly flat surface. It will be a slower process than 

 scraping wood with a piece of glass, but you can do it 

 Never use a chisel or a file on a valve. 



LUBRICATING OIL 



What is oil? 



Oil is a coating for a journal, or in other words is a 

 lining between bearings. 



Did you ever stop long enough to ask yourself the 

 question? I doubt it. A great many people buy some- 

 thing to use on their engine, because it is called oil. Now 

 if the object in using oil is to keep a lining between the 

 bearings, is it not reasonable that you use something 

 that will adhere to that which it is to line or cover? 



Gasoline will cover a journal for a minute or two, and 



