Easy to understand guide on how automotive timing belts work, this information pertains to all timing belt driven engines.
A timing belt is a rubber toothed belt which is designed to drive the camshaft, balance shaft, water and oil pumps depending on manufacturer's engine design, via the engine crankshaft.
A tensioner is used to hold pressure on the belt which is spring loaded, oil
pressure activated or set manually.
The cog of the timing belt is what drives each accessory and when these teeth
fail the engine will stop running, a timing belt is a normal service item.