Matching Pairs Parts of an EngineOnline version To complete this worksheet, match the engine parts with what they do. by Alison Jack 1 Covers the pistons 2 Connects pistons with crank shaft 3 Raises and lowers the valves 4 Lets gas vapor in and exhaust out 5 Pistons reciprocate in these 6 The intake manifold is bolted to this. 7 These vaporize gasoline 8 Surrounds engine block 9 Rotary power output 10 Ignites the gasoline 11 The carburetor sits on top of this. Spark plugs Crank shaft Intake manifild Valves Cam shaft Water jacket Piston rods Engine block Cylinder heads Cylinders carburetor or fuel injector