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1. I can identify the parts of a small engine. 2. I can explain each part’s function(s). Group 2: Crankshaft Components The crankshaft turns the pistons up & down in a circular motion, just like a crank on a jack-in-the-box does. crankshaft This entire part is called the crankshaft. • crank + shaft – crank = arm – shaft = tubular piece of metal • It takes the power produced by the pistons & puts it into rotational power. From there it powers the blade on a mower. • If this part doesn’t work, then the blade won’t spin. crankshaft counter weights • counter + weights – counter = a lot of spinning is going on so need something to counter, or balance, it out – weights = the heaviness of weights help balance spinning • These weights even out the piston’s movement so it spins evenly. They help the engine run smoothly. magneto journal • magneto + journal – magneto = magnet – journal = 1 section of crankshaft; 3 total • It is the part that attached to the flywheel. (FYI: Flywheel & magneto are outside engine, & they determine when the engine fires.) PTO journal • power take-off + journal – power take-off = taking power from one place & giving it to another place – journal = 1 section of crankshaft; 3 total • It spins the part that the engine is trying to spin (blade, wheel, driveshaft). crankpin journal • Crank + pin – crank = arm – pin = hold things together (FYI: Even though there is no pin on this piece, it works with another piece that does use a pin.) • This transfers the force of the piston & connecting rod into a rotational force/power. Animation • Take a look at how these parts work together in this video.