326 FARM MACHINERY REPAIR 



6) Remove the valves and free them from all carbon. 



7) Note the valve seats to see if they are free from carbon 

 and not pitted. 



8) If valves are in poor condition, they should be ground as 

 follows: (a) Apply a little coarse valve-grinding com- 

 pound to the valve seat, put the valve in place and grind 

 it by inserting the point of the screw-driver in the slot, or 

 use a valve-grinding tool, and grind by revolving back 

 and forth about one-fourth turn, exerting -a little pres- 

 sure. Lift th e valve occasionally to reseat it. Continue 

 the process until the rough surface on the valve is re- 

 moved. (6) Apply a little fine valve-grinding compound 

 to the valve seat and repeat the process as outlined under 

 (a) . Continue process of grinding until the valves are all 

 seated, (c) Clean the valve and valve seat to prevent 

 any compound from entering the cylinder. 



9) Disconnect the connecting rod from the crank shaft, and 

 remove the piston from cylinder, (a) Clean all carbon 

 from the piston. (6) Examine all piston rings; note if 

 any are stuck or broken, (c) If necessary to put on new 

 rings, use three or four thin pieces of tin with which to 

 slip on the rings. Rings are very brittle and must be 

 handled with care. 



10) Note the wall of the cylinder to see that it is not scored. 



11) Remove all oiling devices and see that oil or grease passes 

 thru to the points lubricated. 



12) Examine crank-shaft bearings. 



13) Remove governor. Examine the spring. 



14) Remove push rods and lever. 



15) Examine cam shaft and gears. 



