The timing belt transfers power between the crankshaft and the camshaft pulleys, which is a part of an internal combustion engine that controls the timing of the engine's valves, Timing belts replace the older style timing chains which were popular until the 1970s and 1980s,Automobile manufacturers use this kind of timing belt instead of more durable chain simply because chains are noisier and more expensive to manufacture.
When an automotive timing belt is replaced, you must take care to make sure that the valve and piston movements are accurately synchronized. If failure, which might result in issues with valve timing, and this in turn, in extreme conditions, can result in collision between valves and pistons in interference engines. This isn't an issue unique to timing belt as the same issue happens in all other cam/crank timing methods for instance gears or chains. To reduce a timing belt from being incorrectly installed, the timing belt had painted marks on the surface of the belt which line up with markings on the crankshaft gear and camshaft gears so the belt is perfectly alligned and correctly positioned.
Timing belts should be replaced in the producer's suggested distance or periods of time. Failing to exchange the belt may lead to entire break down or tragic engine failure. The user guide maintenance schedule is the source of timing belt replacement intervals, generally every 60,000 to 90,000 miles .It's quite common to replace the timing belt tensioner as well as the belt is replaced.
The typical failure modes of timing belts are generally stripped teeth or delamination and unraveling of the fiber cores. Damage of the belt, due to the nature of the high tensile fibers, is unusual. Correct belt tension is important - too loose the belt will whip, too tight it will whine and put excess stress on the bearings of the cogs. In either case belt lifetime will likely be significantly shortened. Apart from the belt itself, also typical is a failure of the tensioner, or various gear and idler bearings, resulting in the belt to destroy.
A timing belt is usually rubber with high-tensile fibers operating the length of the belt as tension members.
Rubber degrades together with higher temperatures, along with exposure to motor oil. Therefore the lifetime expectations of a timing belt is reduced in hot or leaky engines. Which means that special measures should be taken for off-road applications to permit water to empty away or why not be sealed from contact with the belt, even if newer or more expensive timing belts are produced from temperature resistant materials for instance "highly-saturated nitrile" (HSN). The lifetime of the reinforcing cords is also significantly suffering from water and antifreeze.
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