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Harmonic Balancer 700 1987

posted by  Don Foster on  Sat Nov 16 00:39 CST 2002
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

A quick description of "the noise" would have helped. Does it sound like pebbles in a can, geese flying south for the winter, or cars at the demolition derby?

Timing belts do not, as a rule, make noise even when they're overdue for a change. Also, the timing belt and tensioner have no idea whether or not the engine is under load, accelerating, decelerating, and so on. They're just there for the spin.

The harmonic balancer (front pulley) can fail, however. The rubber "donut" that's glued to the inner hub and outer pulley like a sandwich can begin to slip, and this usually causes a squealing sound.

A quick check is to watch the timing marks using a timing light. If the index mark wanders aimlessly in 'n out of view as you run the engine throttle up 'n down, then it's likely that the pulley needs replacement.

If your front pulley is self-destructing, you SHOULD change it immediately. Imagine what might happen if the outer pulley section spins free of the hub at 3000 rpm. It'll be a rocket ship, and splashdown will be your radiator.
--
Don Foster (near Cape Cod, MA)






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