Technical Help! Alternator shaft/pulley bolt is stuck

Typical project for a rainy afternoon. I bought a replacement chrome cover for my 350SBC ,probably aftermarket, 1 wire alternator. The old one's chipped up, but the alt. runs fine. It came off the engine just fine, but the chrome nut that holds the pulley onto the shaft is VERY dedicated to remaining just where it is.

The shaft has a hex key socket and the pulley nut is about 1". I've hit it with PB Blaster, but I am not sure whether it's a standard, or a reversed ( LH) thread. Any help? Thanks in advance.

 

Did mine not long ago, standard RH thread. GM 1 wire and my old 3 wire both.

 

Use a impact with a 6 six side socket.

 

best way

 

I have never been able to take one off without using an impact gun.
And as stated above use a 6 point impact socket.
KK

 

Yep, but if you are holding it by hand, make sure you have a couple layers of good leather gloves. That spinning fan is lethal if it gets away on you. Also make sure you keep the shaft to the front or you'll mess up the electronics in the back of the alternator.

 

I have clamped the Allen wrench in a vise before and then used a wrench to take the nut off but an impact works so much better. It might be well worth the trip down to the parts house to get the counter guy you get your parts from to bust it loose for you. They usually have an impact wrench with the right socket on it on the bench next to the alternator tester.

 

So how are you anchoring the shaft-clearly you can't use a hex wrench in the middle if you're putting a socket on it.

 

The impact should just spin it off...... You've soaked it,so it should just come off that much easier.......SHOULD take about 3 seconds with an impact and your done........
And yes- Lefty loosey,Righty tighty....

 

put a socket with a breaker bar on the bolt and hit the end of the breaker bar with hammer. you don't even need to hold the pulley still. this works just about every time. i would first try the impact first if you have one

 

I guess I am wearing my stupid hat tonight, but why doesn't the impact socket just spin the nut on the shaft -doesn't something have to lock the shaft to the nut will spin off?

 

inertia
hold the fan with your hand

 

the rotor in the alternator tends to lag behind the nut when sharply turning the nut off. the force needed to turn the nut off the rotor shaft is less than that of the force needed to turn the rotor. it is the principle of inertia

 

Not stupid hat...... Called trial and well,trial..... If everything was so easy, well, I don't know what i'de be- Maybe grown up? ?

 

I take a old belt and put it in the pulley then into a vice and make it tight around the pulley then impact it , sometimes a jolt towards tightening it then quickly reverse the impact will break the grip .

if not a old belt a strap wrench around the pulley will hold it tight too . do not try holding the fan too easy to bend it up .

 

Damn! I think I have got it almost put back together-not quite the 20 minute job suggested in the catalog. Thanks for all the help. This video was helpful, too-things like making sure the brush connectors are well back to as the brushes wear,they're not brought forward and cut by the rotor, making sure the rotor connections to the bridge are not shorting out between the + and - plates, how to put that little pin in to hold the brushes back while you feed the shaft into the bearing,etc.