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Faulty Timing Belt Tensioners >
Reducing Timing Belt "Comebacks"
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NAPA Belts/Hose
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Replacing Tensioner Components Significantly Reduces "Comebacks."
Replacing the tensioner components along with the belt will significantly
reduce the risk of comebacks and expensive engine damage that can result from a belt failure. Here's why:
The lifespan of many OEM tensioner components is only about 2,000 hours,
or the equivalent of 40,000 to 60,000 miles or more depending on how the
vehicle is driven. Tensioner bearings are "sealed for life" and are not
serviceable, so there's no way to clean, inspect or relubricate the bearings
when a timing belt is changed. What's more, it's difficult to determine the
true condition of the tensioner components because they are not running under
a load. Consequently, a simple visual inspection may miss tensioner bearings
that are on the verge of failure.
On many newer engines, spring-loaded automatic tensioners are used to
keep the timing belt tight. If the slide plate is worn or sticking, or the
spring is weak, it can prevent the tensioner from maintaining proper
pressure.
That's why old tensioning components should not be reused. Even if the
bearings last another 20,000 miles, replacing them would be expensive and
require the installation of another new belt. Better to replace everything at
one time with a NAPA Belt/Hose Timing Component Kit.
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Product Literature
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WHY TENSIONER COMPONENTS ALSO NEED TO BE REPLACED WHEN CHANGING A TIMING BELT
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Timing belts have a limited service life. That's why belts should always be replaced at the vehicle manufacturer's recommended mileage interval. But a belt change alone may not be enough because the majority of belt failures are
actually caused by faulty belt tensioners and pulleys. Consequently, the new timing belt you've just installed may fail after a few thousand miles if the tensioner components are worn or loose. This one page flyer explains why.
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