Yeah on the 4G63 it's very easy to put the water pulley on backwards (not sure about the NA). I've done it and it threw the belt. Also make sure the Alternator pulley is not wearing. Use a big flat ruler or something to make sure the alt belt is in line with all the pulleys. Or just eyeball it really good. Something has to be out of line, or one of the pulleys has to be bad.
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