Chapter 22. -DIESEL AND GASOLINE ENGINES 



COUNTER-WEIGHTED 



CAMSHAFT AND 



BALANCE SHAFT 



DRIVE GEARS 



BLOWER 

 DRIVE 

 GEAR 



IDLER 

 GEAR 



FLYWHEEL 

 PILOTS 



CRANKSHAFT GEAR 



75,98X 



Figure 22-24.— Camshaft and accessory drive. 



found in diesel engines. Some manufacturers 

 utilize mechanisms consisting primarily of chain 

 assemblies, while others use gears as the pri- 

 mary means of transmitting power to engine 

 parts. Combination gear-chain drive assemblies 

 are used on some gasoline engines. 



ENGINE FUEL SYSTEMS.-The method of 

 getting fuel into the cylinder is one of the major 

 differences between gasoline and diesel engines. 

 As pointed out earlier, fuel for gasoline engines 



is mixed with air outside the cylinder and the 

 mixture is then drawn into the cylinder and com- 

 pressed. On the other hand, fuel for diesel 

 engines is injected or sprayed into the combus- 

 tion space after the air is already compressed. 

 The equipment which supplies fuel to the cylin- 

 ders of a gasoline engine would necessarily be 

 different from that of a diesel engine. 



There are several types of fuel injection 

 systems in use. The function of each type is, 

 however, the same. The primary function of a 



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