The Mazda MPV Timing Belt is a flexible drive, which ensures that the crankshaft and camshaft of the van turn in perfect synchrony, eliminating cases of valve-piston collisions while providing smooth power. Constructed of reinforced rubber, it is fitted around pulleys on the crank and on the cam, and is kept in place by an automatic tensioner and idler rollers that ensure that valve timing remains exact on SOHC and DOHC engines. Many Mazda drivers appreciate the Timing Belt as it is easily routed; it is quiet, does not require any oiling, and is less expensive than the previous chain or gear systems applied in the oil bays. With improvements in materials, the recommended service life increased by 30000 miles in the early designs, up to 60000 miles or more in modern designs, although adherence to Mazda regular service intervals is still paramount, as a broken belt immediately cuts the engine off and, on interference designs, may cause the pistons to bang against open valves. Even a dilapidated Timing Belt which drops teeth or goes slack can jump time and leave the engine rattly or unwilling to start. The tooth profiles between various Mazda production years changed to curved instead of square, which decreased noise and increased durability while maintaining the same fit on the same sprockets. Look for cracks, frays, or oil soak, and it is always good to change the automatic tensioner, idlers, and often even the water pump during replacement as the work overlaps. The belt helps owners of the MPV avoid expensive engine repairs by considering it necessary regular maintenance.
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