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Cylinder  Sleeve  or  Bore
Crankshaft

Mechanical Science Volume 1 of 2
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Diesel Engine Fundamentals DOE-HDBK-1018/1-93 DIESEL ENGINES In engines using sleeves, there are two Figure 5   Diesel Engine Wet Cylinder Sleeve types of sleeves, wet and dry.   A dry sleeve  is  surrounded  by  the  metal  of the block and does not come in direct contact    with    the    engine's    coolant (water).   A wet sleeve comes in direct contact   with    the    engine's    coolant. Figure 5 provides an example of a wet sleeve.    The  volume  enclosed  by  the sleeve or bore is called the combustion chamber  and  is  the  space  where  the fuel is burned. In  either  type  of  cylinder,  sleeved  or bored, the diameter of the cylinder is called  the  bore  of  the  engine  and  is stated  in  inches.     For  example,  the bore  of  a  350  cubic  inch  Chevrolet gasoline engine is 4 inches. Most diesel engines are multi-cylinder engines    and    typically    have    their cylinders   arranged   in   one   of   two ways, an in-line or a "V", although other combinations exits.   In an in-line engine, as the name  indicates, all the  cylinders  are in a  row.   In  a "V" type engine  the cylinders  are arranged in two rows of cylinders set at an angle to each other that align to a common crankshaft.   Each group of cylinders making up one side of the "V" is referred to as a bank of cylinders. Figure 6   Piston and Piston Rod Piston  and  Piston  Rings The piston transforms the energy of the expanding gasses into mechanical energy.  The piston rides in  the  cylinder  liner  or  sleeve  as shown  in  Figure  2  and  Figure  3. Pistons   are    commonly   made   of aluminum or cast iron alloys. To  prevent  the  combustion  gasses from  bypassing  the  piston  and  to keep  friction  to  a  minimum,  each piston has several metal rings around it, as illustrated by Figure 6. Rev. 0 ME-01 Page 7







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