368 AGRICULTURAL ENGINEERING 



In selecting an engine, the accessories are often given little 

 attention, when they should be carefully inspected; and, if 

 the engine is not well equipped in the way of first-class acces- 

 sories, they should be selected. 



The lubricating system should be permanently installed 

 and so arranged as to give all working parts a liberal supply of 

 oil. The multiple oil pump is to be highly commended in 

 this connection. Exposed oil holes, which may become rilled 

 with dirt and grit, should be guarded against. 



Summary. The following outline is suggested to aid a 

 purchaser in making a comparison of the merits and value of 

 different engines. The information asked for in this outline 

 should be so obtained from all the engines considered. 



THINGS TO CONSIDER IN SELECTING AN ENGINE. 



Name of engine. 



Type stationary or portable. 



Rated horsepower. 



Diameter of cylinder. 



Length of stroke. 



Revolutions per minute. 



Piston speed per minute. 



Calculated horsepower by formula. 



Cooling system. 



Frame construction . 



Main bearings construction, accessibility, and adjustment. 



Cylinder and piston construction. 



Crank construction . 



Gears construction . 



Valves construction and accessibility. 



Ignition system construction and protection. 



Lubrication system construction and completeness. 



QUESTIONS 



1. What are the principal features to be considered in selecting 

 a gasoline or oil engine? 



