The Mazda 626 Timing Belt maintains the crankshaft and camshafts in perfect sync, allowing the engine to breathe at the appropriate time to ensure that the power is in a consistent and powerful state. The Timing Belt in both SOHC and DOHC versions of the 626 engine connects the crankshaft to one or two overhead cams in a routed loop which passes over a tensioner and an idler pulley mounted on springs, and is less noisy and much lighter than the previous chains and gears. Initial designs of Timing Belts would provide approximately 30,000 miles of reliable service, but better fiber reinforcements and profiles of teeth now provide an average of 60,000 miles and above with lower cost and inconvenience for Mazda owners. When not addressed, an old belt could also jump timing or break and instantly shut the engine, and since many versions are interference design, broken valves or broken pistons may be the next outcome. The cracks, missing teeth, fraying, and fluid contamination can be examined by visual inspection, but even a component that looks impeccable still needs to be replaced at the mentioned Timing Belt mileage as well as the automatic tensioner and idler to maintain factory timing accuracy. The water pump on these cars is frequently driven by the Timing Belt also and thus many owners change the pump during the same job to prevent paying labor twice. The modern belt is less expensive than a metal chain, does not require lubricant and is quite silent when running as compared to the metal one, indicating why Mazda kept adopting it even in the new generations. Remaining in the recommended timetable keeps any Mazda engine lively and wallets not in need of huge internal repairs.
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