Exhaust

Exhaust

Exhaust gas is poisonous. You don't want it getting into the passenger compartment. For example, carbon monoxide can be deadly. That's why you should never run your engine in a closed garage. If you have a leak in the exhaust system, exhaust could get into the passenger cabin and make you sick or even kill you.

Serpentine Belt

Serpentine Belt

You know that long belt that snakes around the front of your engine? It's called the serpentine belt. The serpentine belt is driven by the engine as it turns. It powers your alternator, air conditioning compressor and power steering pump. On some vehicles, it also runs the water pump, radiator fan and power brakes. Sounds like a lot of stuff, doesn't it?

Timing Chain

Timing Chain

As your engine runs, the intake valves need to open up to allow air into the engine. They remain closed while the air and fuel is compressed and ignited, powering the piston. Then the exhaust valves open to release the exhaust. This all has to be timed very precisely. It is the job of the timing belt or timing chain to make sure all of this is synced up properly.