1 64 Book of Engineering 



lubrication system is applied to every 

 bearing. 



These engines are of the air injection 

 type, are single acting, operating on the 

 four stroke cycle, the piston being of the 

 trunk type. The air compressor is of the 

 three-stage type, with coolers after each 

 compression, the delivery pressure being up 

 to a 1,000 Ib. per square inch, and there is 

 a pressure and output control on the intake 

 valve. 



The compressor is driven by an overhung 

 crank at one end of the main shaft, and 

 is mounted on an extension of the main 

 engine bed-plate. Since these engines run 

 at higher speeds than are usual, provision 

 is made for cooling the piston head and 

 exhaust valves by oil when conditions 

 make this necessary. Always, on the larger 

 standards, the exhaust valve seats are 

 water cooled. 



The high-speed Diesel engine offers many 

 advantages over the low-speed engine, the 

 chief of which are more power from the 

 same space, less head room required on 



