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1. Crankcase

Small Engine Parts Four-Cycle. By Katie Murray, UGA Agriculture Education Edited by Georgia Agriculture Education Curriculum Office May 2006. 1. Crankcase. Engine Block. 2. Cylinder Block. 1. Crankcase. Crankcase Cover. Cylinder Block. 1. Cylinder Bore. Head gasket goes here.

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1. Crankcase

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  1. Small Engine Parts Four-Cycle By Katie Murray, UGA Agriculture Education Edited by Georgia Agriculture Education Curriculum Office May 2006 1. Crankcase

  2. Engine Block 2. Cylinder Block 1. Crankcase Crankcase Cover

  3. Cylinder Block 1. Cylinder Bore Head gasket goes here 3. Cooling Fins 2. Valves

  4. Cooling Fins-Cooling fins keep heat away from the cylinder block by increasing the surface area of the cylinder block and contacting the already existing cooler air for cooling efficiency. Spark Plug

  5. Throw-measurement from the center of the crankshaft to the center of the crankpin journal. Determines the stroke of an engine. Throw = ½ stroke. Crankshaft Crankshaft-converts the linear motion of the piston into rotary motion. Counterweights-balances the forces of the reciprocating piston and reduces the load on crankshaft bearing journals. Crankgear-interlocks with the cam gear to turn the crankshaft

  6. Crankshaft Crankpin Journal-attaches the connecting rod to the crankshaft PTO Journal Magneto Journal Bearing Journal

  7. Piston Rings Skirt Piston Head Piston Pin Bore

  8. Piston Rings 1. Compression Ring-seals the combustion chamber from any leakage during the combustion process. 2. Wiper Ring- used to further seal the combustion chamber and to wipe the cylinder wall clean of excess oil. 3. Oil Ring-Wipes excess oil from the cylinder wall during piston movement. Openings in the ring returns the excess oil to the engine block.

  9. Ring Grooves Ring Lands

  10. Connecting Rod-transfers motion from the piston to the crankshaft and functions as a lever arm Piston Pin Crankpin Journal Bearing Surface Piston Piston pin Bearing Surface Rod Cap

  11. Valve Tappets Valve Tappets-Rides on the camshaft and pushes the bottom of the valve stem to open the valve

  12. Cam Shaft- includes cam gear and cam lobes; driven by the crankgear 1. Cam Gear-portion of the camshaft that interlocks with the crankgear. 2. Cam Lobes- egg-shaped protrusion on the camshaft that moves a tappet to open a valve; controls the lift and duration of the opening and closing of the valves

  13. Valve Spring Valve Retainer Valve Head Valve Stem Intake Valve- allows the air-fuel mixture to flow into the cylinder Exhaust Valve- allows exhaust valves to flow out of the cylinder

  14. Flywheel Flywheel Nut

  15. Magneto Spark Plug Wire Armature Magneto

  16. Air Filter

  17. Carburetor Carburetor- provides the proper mixture of air and fuel to the intake valve

  18. Intake Manifold

  19. Muffler Muffler Guard

  20. Breather Assembly Breather Cover

  21. Shields Cylinder Shield

  22. Dipstick

  23. Starter Housing

  24. Gas Tank

  25. Blower Housing Cover

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