Alternator pulley

[Junior0415]

My truck didn't come with the pulley on the alternator and I'm trying to find one. I'm not sure the size of the one on that should be on it let alone a part number. Does anyone have any information on this?

 

[Hummer Guy]

My truck didn't come with the pulley on the alternator and I'm trying to find one. I'm not sure the size of the one on that should be on it let alone a part number. Does anyone have any information on this?

Depends on the generator you have

 

[simp5782]

Depends on the generator you have

No.

They are all serpentine with a 7 or 8 rib belt. 7/8" shaft is the industry standard.

I bet it's a 7 rib. Looks like a 0 off from @Elijah95 video

241751 - 7-Groove Alternator Pulley for Delco 20Si and 21Si Series Alternators. May fit other alternators with 22.23mm (7/8 in.) Shaft

Alternator Pulley - 7-Groove Dimensions: 25mm Belt x 57mm OD x 22.23mm (7/8 in.) Bore

store.alternatorparts.com

 

[Hummer Guy]

No.

They are all serpentine with a 7 or 8 rib belt. 7/8" shaft is the industry standard.

I bet it's a 7 rib. Looks like a 0 off from @Elijah95 video

241751 - 7-Groove Alternator Pulley for Delco 20Si and 21Si Series Alternators. May fit other alternators with 22.23mm (7/8 in.) Shaft

Alternator Pulley - 7-Groove Dimensions: 25mm Belt x 57mm OD x 22.23mm (7/8 in.) Bore

store.alternatorparts.com

But the 200a generator needs the clutch pulley instead of just the normal pulley right?

 

[simp5782]

But the 200a generator needs the clutch pulley instead of just the normal pulley right?

It doesn't have to have it. The 200amp units have not used them for years. Clutch pulleys just take some vibration absorption out of the alternator.

 

[Hummer Guy]

It doesn't have to have it. The 200amp units have not used them for years. Clutch pulleys just take some vibration absorption out of the alternator.

Good to know, I assume it also helps the belt tensioner as well? I remember using the regular pulley and it had the tensioner vibrating a lot

 

[Junior0415]

The belt is a 12 rib. I'll get pictures of the alternator today to find out what size it is. Is the shaft the same size on all of them? I know it's regulated and if it's undersized it will spin faster producing more power. I don't want to get it oversized and it be spinning under what it should be.

 

[simp5782]

The belt is a 12 rib. I'll get pictures of the alternator today to find out what size it is. Is the shaft the same size on all of them? I know it's regulated and if it's undersized it will spin faster producing more power. I don't want to get it oversized and it be spinning under what it should be.

The neihoffs are comparable to Delcos so they are 7/8

https://www.amazon.com/GROOVE-ALTERNATOR-PULLEY-8600629-8600581/dp/B07ZJN7PB9

 

[CM1RETIRED]

My truck didn't come with the pulley on the alternator and I'm trying to find one. I'm not sure the size of the one on that should be on it let alone a part number. Does anyone have any information on this?

My truck didn't come with the pulley on the alternator and I'm trying to find one. I'm not sure the size of the one on that should be on it let alone a part number. Does anyone have any information on this?

Did you ever find one? If you have a 150 amp alternator i have a pulley you can have for the shipping.