How does an engine work?

Let's look at some key engine parts in more detail. - Match the part of the engine with the correct function.

spark plug - piston - sump - crankshaft - piston rings - valves - connecting rod

Spark plug

The spark plug supplies the spark that ignites the air/fuel mixture so that combustion can occur.

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The intake and exhaust valves open at the proper time to let in air and fuel and to let out exhaust.

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It is a cylindrical piece of metal that moves up and down inside the cylinder.

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They provide a sliding seal between the outer edge of the piston and the inner edge of the cylinder.

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It connects the piston to the crankshaft. 

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The crankshaft turns the piston's up and down motion into circular motion.

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It surrounds the crankshaft. It contains some amount of oil, which collects in the bottom of the sump