The timing chain is made of metal and turns on metal gears or sprockets, so it needs to be lubricated with oil. Here is an example of a timing chain system with the chain, guides, tensioners, sprockets, etc. As the camshaft turns, small lobes also called cams push up against the valves to open them. The camshaft turns once for every two turns of the crankshaft. The timing chain is connected to the camshaft and crankshaft by a set of gears, usually located on the front of the engine block. What is a timing chain?Ī timing chain is responsible for opening and closing the intake and exhaust valves in an engine. This article will go into detail on timing chain function and how to tell when your timing chain starts to fail. Over time they wear down and stretch which can lead to various performance issues and even cause catastrophic engine damage. The timing chain is responsible for ensuring proper timing of the valves opening and closing. Next, the spark plugs fire creating combustion, sending the piston back downwards where the exhaust valve opens letting the air out of the cylinder.įor engines to function properly, the timing of the intake valve opening/closing, the combustion taking place, and the exhaust valve opening/closing must be precise. The piston pushes back upwards, compressing the air and fuel and the intake valve closes. The piston pushes downwards and the intake valve opens, letting air and fuel into the cylinder. The first “stroke” in a typical four-stroke engine is the opening of the intake valve. Timing chains are an essential component to engine timing.
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