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Originally Posted by GaryWMoses
thanks for the speedy reply, yeah it makes sense, why would an internal engine noise stop with the belt removed and the engine running? I know I need a puller which I can get from Auto Zone - Loan a tool. I would appreciated any detailed instructions you could provide. Also I have junk yard which i can get on the yard for a $1 remove and inspect the part before I buy it. What do I look for in good harmonic balancer and what bad do I look for. At this point $ is an object and I have the time to do the work myself. Also I was told you shouldn't be able to turn this pulley with the engine off, it doesn't spin all the way around, but can be turned at least 3/4 of the way before it stops.
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The outer ring of the balancer should not move. If it does, even a bit the rubber is bad. And yes, there is a bit of steel overlap between the inner and outer ring. This steel to steel contact is why it will not turn all the way around.
It is what rattles when the rubber goes bad, due to the torsional vibration of the crankshaft. The balancer exists to dampen these vibrations.
Running an engine with a bad balancer or none at all may eventually break the crankshaft.