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On many newer engines, spring loaded automatic tensioners are used to keep the timing belt tight. A slide plate allows the tensioner roller to move against the belt. As the miles accumulate, wear can cause the plate to stick against the engine block, preventing the tensioner from maintaining proper pressure. High under hood temperatures also can cause a loss of spring tensioner over time.

If the belt loses tension, it may jump time or slip. And if an idler pulley or tension seizes, it may cause the belt to suddenly snap.

It is difficult to determine the true condition of the tensioner components with a simple visual inspection because the components are not operating under a load. Even so, any pulley bearing that has visible looseness, grease streaks radiating outward from a damaged seal, makes noise or does not turn freely should be replaced before a new belt is installed - otherwise the new belt is doomed to premature failure.

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