The essence of the actual work of the Volkswagen Passat Timing Belt is to ensure that the crankshaft and camshaft are in correct synchrony such that the valves swing at the right time as the pistons move. In the majority of modern Volkswagen engines, a flexible reinforced rubber belt loop is applied around the sprockets, tensioners and idler pulleys, as opposed to the heavier chains and gears that were previously applied, since the rubber belt is easy to route, quiet, requires no oil bath, and is cheaper. The previous models of Volkswagen had an advantage of using straight-tooth belts that required replacement within 30,000 miles, whereas today better materials of the component are applied, combined with curved teeth, which allow the part to last 60,000 miles or even more without creating noise. The scheduled changes must not be postponed by the owners, irrespective of the mileage, as a broken belt will immediately stop the engine, and in interference designs, such as many Passat versions, will allow the pistons to hit open valves, causing serious damage. Even partial wear may cause the belt to skip over a tooth and cause rough running or no start at all. Cracks, missing teeth, frayed edges, or oil contamination can be quickly checked visually to indicate that a new belt is required, and the automatic tensioner and idler pulleys should also be checked whenever a Timing Belt is changed to ensure a consistent level of tension. Since the water pump frequently rotates with the belt, replacement of the pump during the service will save labor and prevent an early leak. A well-maintained Timing Belt in the Volkswagen ensures that the engine is smooth and efficient and capable of covering many more miles.
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