who has a Chevy altenator on series

[DaveB]

I have a chev alternator on mine. It is the single wire self-exciting variety. (sounds bad, doesn't it?) The shop that did it suggested that a flat bracket is strongest so they suggested a dual pulley alternator. This fit well with a pretty generic bracket from an auto wrecker bolted to the top of the waterpump and the belt going over the outer pulley of the alternator, in a very straight path.

Is your belt mis-aligned, causing stress to the waterpump pulley, which in turn would stress the shaft, seal and bearings?

Dave

[Bill E.]

Good points Dave, it seems pretty certain that the problem is one of mis-alignment or the belt being to tight. I have a Delco on my 90 and haven't had any problems.
Bill

[exmod110]

also make sure that you are not overtightening the belt, this will cause the waterpump bearings to fail prematurely... Don't know what to say about the broken brackets, try a differant location on the block to mount the bracket to change the angle?????

[exmod110]

http://www.jpurnell.com/RR/repairs/DelcoAlternator.htm
has some on a rr motor, might help???