Alternator Pulley wrong size

[Praxiss454]

Originally Posted by jtrichard

DPOWERS if you want to turn that engine into a pay it forward offer i need the frame half of the motor mounts from both sides and there is a guy that needs the engine half of both sides and im sure that Praxiss454 could use both upper and lower alt. brackets looks like that would solve his dilemma rather than see it all junked

Actually think I have the right brackets now, and my stuff still doesn't line up. But I did have my eye on that fan pulley, just to take my engine back to original style parts.

[TJ's Chevy]

I'll check to see if I have a spare. For what it's worth I ran one of my 292s with the "newer" setup with the belt misaligned and never had issues. Matter of fact when I got my 66 it was like that with a stock type externally regulated alternator which I assumed was changed out at some point. Had the same pulley posted in the picture of the new alternator and I just tighten down the belt and left it. Ran for years until I pulled the motor for a hotter 6. Then when I got my 64 chevy I saw that the L6 had that spaced out pulley and thought so that's what is wrong! Pulled the pulley from that motor(truck was for parts) and now it is on my new engine and things line up nicely. That setup shouldn't be super hard to find, best thing would be to find a Complete 230-250-292 with that setup and steal the pulley.

[jtrichard]

From the DPOWERS pic it appears to line up quite good with a NO extension pulley .... And no offense to jdl71 but the belt alignment in his pic in your other post about brackets is terrible if you ask me

[Praxiss454]

Okay closing out my old thread (hopefully) with some info that will be helpful if anyone else ever encounters this. I just ordered a repop pulley off ebay for $26 (had a coupon though to make it cheaper). You can find it searching for GM# 3829193. I'll add a pic of things when I get my engine buttoned up.

[63burban]

If you have the old alternator just switch the pulleys

[Praxiss454]

yeah I didn't have the old alternator, this is what came with my truck when I bought it and it never lined up.

The part I bought on eBay looks like it's going to work. It is funny having a shiny new pulley on an old looking alternator, but I think the spacing is going to be right. It's a lot better than having those washers crammed in there.

[LostMy65]

Posted from another thread:

Originally Posted by kdh454

This is probably not your problem, but I'll leave it here in case someone happens to make the same mistake I did.

I had a similar issue years ago after installing the engine in my Chevelle - alternator belt squeaked like crazy, got hot, and flew off. After several attempts at tightening and replacing the alternator, I pulled off all the pulleys to clean them up. Only then I realized the problem was mismatched water pump and crank pulleys. I don't remember exactly which was which, but I believe the crank had two identical pulleys and the water pump had one large and one small pulley. Basically, the alternator belt was being forced to slip around one of the pulleys, got fed up with it, and decided to end it's miserable life by being chopped to bits by the fan. I swapped out one of the pulleys, and all was right again.

Old thread.. But I think this is my issue. Had no problem until I had to get a new alternator. The pulley on the alternator has a different shape grove. I'm going to try and swap out the pulley and see if that fixes it.
I'll post back if that fixes it.

[LostMy65]

Originally Posted by LostMy65

Posted from another thread:

Old thread.. But I think this is my issue. Had no problem until I had to get a new alternator. The pulley on the alternator has a different shape grove. I'm going to try and swap out the pulley and see if that fixes it.
I'll post back if that fixes it.

Yep, that was it. The new one is quite a bit narrower.
I'll know next time to check the pulley width.

[LostMy65]

Got a new wider pulley for the alternator.
Solved the issue.

[LostMy65]

I learned another thing today. The angle of the v groove. I'm sure this may be obvious info for some, but I'm still learning.