The timing belt (also known as the cambelt) is the ridged belt connecting the crankshaft to the camshaft. It ensures synchronised rotation of these parts and controls the opening and closing of the engine’s valves. In an interference engine the timing belt also stops the valves being struck by the pistons. Many newer cars have timing chains instead of timing belts as these last longer. If your car is one that still has a timing belt you will need to change it according to the manufacturer’s recommendation – usually every 60,000 miles or 5 years.