Unlike a timing chain, which is made of metal, a timing belt is made of rubber. While a timing chain only needs to be replaced when there is evidence of wear or other problems, a timing belt must be replaced a regular intervals.
Recommended timing belt replacement intervals at approximately 60,000 miles are intended to prevent timing-belt failure, which can result in considerable engine damage.
Another reason to replace an old timing belt is that is stretches over time, which can lead the engine timing to become too delayed.
Symptoms of delayed engine timing include lack of power and slow pick-up. It is usually recommended that the water pump also be replace at the same time that the timing belt is changed.
TIP: It is the timing belt’s job to precisely time valve opening an closing with the up-and-down movement of the pistons.
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