1. Parts of I.C engine Cylinder Piston Connecting rod
Crank and crank shaft
Valves
Flywheel
Crank case

2. Crankshaft
Crank is the lever that is connected to the end of the connecting rod by a pin joint with other end connected rigidly to a shaft, called crankshaft.

3. Valves
Devices which control the flow of intake and exhaust gases to and from the engine cylinder.
Flywheel
Heavy wheel mounted on crankshaft to maintain uniform rotation of the crankshaft.

4. Crankcase
Lower part of the engine serves as enclosure for crankshaft and sump for lubricating oil.

5. Four stroke petrol engine
Suction stroke
Compression stroke
Power stroke
Exhaust stroke