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Small Engine Parts Four-Cycle

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Presentation on theme: "Small Engine Parts Four-Cycle"— Presentation transcript:

1 Small Engine Parts Four-Cycle
1. Crankcase

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

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

4 Spark Plug 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.

5 Crankshaft 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-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 Magneto Journal PTO Journal Bearing Journal
Crankpin Journal-attaches the connecting rod to the crankshaft Magneto Journal PTO 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 Crankpin Journal Bearing Surface
Connecting Rod-transfers motion from the piston to the crankshaft and functions as a lever arm Piston Pin Piston Piston pin Bearing Surface Crankpin Journal 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 Intake Valve- allows the air-fuel mixture to flow into the cylinder
Valve Spring Valve Retainer Valve Stem Valve Head 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 Swivel socket starter

26 Starter clutch wrench

27 Flywheel puller .

28 Flywheel starter clutch wrench

29 Flywheel holder .

30 Blade balancer .

31 Valve seating tool .

32 Carburetor nozzle screw

33 Valve compressor tool .

34 Piston ring compressor

35 Piston ring expander .

36 Foot lb torque wrench .

37 Telescoping gauge .

38 Cylinder hone .

39 Gear pulley .

40 Allen wrench .

41 Valve grinding compound

42 Piston ring compressor

43 Snap ring pliers .

44 Valve spring compressor – large engines

45 Ridge reamer .

46 Small engine oil – 30W .

47 Feeler gauge .

48 Spark tester .

49 Spark plug gauge .

50 Test lamp .

51 Compression tester .

52 Repair Manual - BS .

53 Foam air filter .

54 Carburetor gasket .

55 Coil (armature) – two leg

56 muffler .

57 Piston rings .

58 Connecting rod .

59 Gasket sets .

60 Spark plug .

61 .

62 Blower Housing Cover

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