The Mazda MX-6 Timing Belt ensures that the camshaft and crankshaft are moving in perfect harmony, allowing the valves to open and close at the precise time that the pistons occupy their critical positions and, as a result, provide the engine with smooth power and fuel efficiency. Within each Mazda overhead-cam powerplant, the belt runs on toothed pulleys, a tensioner spring, and one or more idler wheels in a simple loop that does not require any lubrication, runs quietly, and is cheaper to manufacture than metal chains or gears. New Mazda engines also enjoy smooth curved teeth that reduce noise and wear. The first generation of this model required attention at about 30,000 miles, although new rubber compounds and fiber reinforcement have prolonged the time to about 60,000 miles or more as indicated in the owner's handbook. Using that schedule is dangerous since a broken Timing Belt will immediately shut down the engine, and in some models of interference design, a Timing Belt can allow the pistons to hit the open valves and leave the cylinder head in ruins. Partial wear is important, as any tooth that is not engaged by the belt or a sluggish tensioner can result in the belt skipping a tooth and causing misaligned ignition timing, resulting in hard starts and ragged running. Whenever the belt is changed, prudent owners replace the automatic tensioner and idlers, and since the belt, in most models, also drives the water pump, replacing that pump simultaneously will avoid the repetition of the work. This cheap little component is critical to Mazda performance and reliability and hence the Timing Belt should be considered compulsory, regular insurance by all MX-6 enthusiasts.
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