Posted by Peter Kennedy on 11/22/2019 to
Alternators
The nut is on tight and if you try to undo it with a regular wrench the pulley turns instead. Some people try to stop the pulley turning by jamming a screwdriver into the interior of the alternator but that invariably damages it. The tool being used here is a power impact wrench, not a drill. It spins the nut off so fast the pulley doesn't have time to start turning.
Peter Kennedy has been in business since 1991 designing, installing and servicing marine electrical systems. The purpose of this blog is to offer support to both professional installers and do-it-yourself boat owners who wish to undertake this work themselves.
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