Re: I have the same problem
> SO I start the old 78 this morning, and the
> charge light is on. And I hear rattling. So
> I pop the hood, and one of the crank pulleys
> is loose. The first one, that drives the
> water pump and alternator. I can wabble it
> around, behind the ac pulley. So what do I
> do?? Do I need a new pulley assembly?? Is
> this expensive?? Thanks. The pulley still
> turns the pump and alt, but barely.
I had the same thing happen to me when I put a timing chain on my car.The harmonic balancer wobbles and slips .On my car the key groove is now messed up so you might want to look for this on your car.I bought a new one for it thinking this would fix it but the next day it did the same thing.My motor now has 2 woodrif keys in the oil pan.On my car I am going to put a new crank and balancer in the car ,this should fix the problem.If your key hole is messed up you will probably have to do the same thing ,because you can't fix it without the crank out of the car.If you were to machine the crank you would need to get a special harmonic balancer because the end of the crank would be too small.That is why I 'am just going to get a new crank and balancer.
p.s hope this makes sense.
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jason