324 FARM MACHINERY REPAIR 



293. Repair and Adjustment of a Motor. (Fig. 326.) 

 Requirements: To repair and adjust a gasoline engine, either 



a simple type or a tractor, truck or automobile engine. 

 The tools needed are the same as in previous projects. 

 Preliminary Instructions: The gas engine is the most com- 

 mon type of mechanical motive power on the farm. 

 Every boy needs to know how to make the simple repairs 

 and adjustments, because the gas engine that is not in 

 good adjustment will waste fuel, will develop only a frac- 

 tion of its power, and will waste the time of the operator. 

 First become thoroly familiar with the engine before try- 

 ing to repair it. Study it carefully, analyze its troubles 

 before trying to remedy them. In the work of disman- 

 tling and putting an engine in shape for operating, the 

 workman must observe extreme care to avoid breaking 

 or marring any part of the machine. Do not use pliers 

 where a wrench should be used, nor a screw-driver where 

 a cold chisel is best suited. Be careful not to tear or de- 

 stroy the packing. Do not screw the coupling on fuel 

 line too tight, as the threads are liable to be stripped. 

 Clean all parts as they are removed. Place small parts, 

 as nuts and screws, in a box provided for that purpose. 

 Where timing gears are removed, see that they are marked 

 so they will be meshed properly when re-assembled. Se- 

 cure instruction book on engine as furnished by manu- 

 facturer. 



294. Overhauling an Engine. The method of proce- 

 dure will vary slightly with different engines, but the follow- 

 ing steps will indicate the general procedure : 



1) Disconnect the wiring. 



