Mazda MPV Timing Chain aligns the movement of the crankshaft and camshaft to ensure that the valves are opened and closed at the right time, which provides the van with a kind of smooth engine power and a high level of durability. The metal Timing Chain, inside the front of the engine unlike rubber belts, which require periodic changing, and with the omnipresent lubrication provided by oil, is able to survive millions of rotations in high-displacement engines. Throughout the history of the design, the model has favored chain layouts that are common to most engines. In a typical overhead cam installation, a full-length Timing Chain is installed between crank and cam and remains silent and accurate provided that the hydraulic tensioner and nylon-lined guides are held firm by the oil pressure. Pushrod block versions have the cam far closer to the crank, and thus a short Timing Chain drive is substituted to reduce the noise produced by the continuous reversals of torque in the gears caused by violent lobe shapes. The similarity between the two layouts is that they both aim to achieve the correct valve timing and minimize wear, and they both tend to last a lifetime of the motor unless lubrication loses its hold or a guide cracks, both of which increase the rattle in the front cover that many owners have experienced. Mazda has long, over the decades, chosen chains due to their longevity, a decision Mazda made both because chains seldom break and because the majority of Mazda drivers are thus spared the cost and time for service and still depend on the precision of timing in their MPV models.
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