Quantcast Section Ill. TECHNICAL PRINCIPLES OF OPERATION

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TM  5-3895-360-13 Section Ill. TECHNICAL PRINCIPLES OF OPERATION Paragraph Page Paragraph  Title Number Number 1-9. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 1-10. Tamper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 1-11. Engine Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 1-12. Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. ...... 1-8 1-13. Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 1-14. Reed Valve Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 1-15. Ignition System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 1-9.   GENERAL. a. The tamper is hand-operated and controlled and can fuel and air mixture to enter the combustion chamber. be  operated  by  one  operator. When  the  piston  approaches  Top  Dead  Center  (TDC),  the fuel  and  air  mixture  is  compressed  in  the  combustion b. The tamper is driven by a 2-cycle, air-cooled,gaso- . chamber. A spark plug then ignites the fuel and air mix- Iine engine. ture.Theresulting  explosion  forces  the  piston  down  and rotates the crankshaft. As the piston moves down, it un- c. Compact frequency is 700 cycles per minute at an impact force of 2200 lb (999 kg). covers the exhaust ports. This allows the exhaust to es- cape and the pressure in the combustion chamber to fall. 1-10.  TAMPER. A tamping shoe is mounted at the lower end of a cylindri- cal spring housing. A piston, installed between large op- posing springs inside the spring housing, is put into action by a connecting rod and crank assembly through a gear train and centrifugal clutch. The piston alternately loads and unloads the springs resulting in a rapid lifting and  dropping  action  of  the  tamping  shoe.  This  action compacts  the  underlying  material. 1-11.  ENGINE  ASSEMBLY Afresh  supply  of  fuel  and  air  mixture  is  compressed  In  the crankcase by the downstroke of the piston. As the piston nears the bottom of this stroke, it uncovers the intake ports. Thetiel and air mixture rushes into the combustion chamber equalizing the pressure between the crankcase and combustion chamber. The fuel and air mixture flows up and around the baffles, then down and out the exhaust ports. This pushes the burned exhaust gases from the cylinder. The compression stroke now begins with the intake ports and exhaust ports covered by the rising piston. As pres- sure increases in the combustion chamber, it decreases in the crankcase allowing a new fuel and air mixture from the carburetor to enter through the reed valve, preparing for the next cylinder charge. When the engine is started, the crankshaft turns and the piston rises, uncovering the intake ports. This allows a 1-7


 


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