ANOTHER thread about 3g goodness

[ÆJackacks]

. . . For those who have not done this yet, make sure you pick up a new belt, # K060507. The old pulley WILL NOT FIT the 3g, so don't even try. . . .

After 2 days i finished my first 3g upgrade, reason being none of the parts shops had the right size belt around here,

I brought both 2G alternators from both my gmq's and the 3G's to a local shop to swap the pulleys. how ever only one of the pulley's from the 2G's fit on the 3G's.

The main shaft thing in the middle(3G) wasn't long enough for the bolt to catch any threads, however the pulley on the other 2G seemed to be thinner in the center and there was enough of the shaft to catch the bolt. i also didn't have to use the spacer on the pulley that worked, but the pulley that didn't work needed a spacer to keep it from grinding against the housing.

What de FAck?

when i put the alt back on the car i was able to tighten the belt as far as the alternator would go

What De FACK???

so now i have to either
A. see if parts shop has a belt that is tiny bit smaller than the orig.
B. go to the alt shop and swap the pulley AGAIN for one that is a little bigger than the original. However, the alt is working and the belt isn't squealing.

anyway the moral of the story is here that you might want to see if you can get the right size pulley to fit on the 3g before you buy the belt, smaller pulley will mean faster speeds at lower rpm, and save money on not buying new belt.

[87gtVIC]

Why did you try to change the pulley in the first place?

[1990LTD]

Had to swap the pulleys on my 2g>3g swap. 5 minutes and an impact wrench.

[87gtVIC]

why?

[ÆJackacks]

couldn't find the right belt, the parts stores up here aparently have no idea what # K060507 means, so i just asked for the closest belt they had for my car but one size larger. it came out way to big. so i just swapped the pulley instead. saved money on not buuying another belt, (orig was month old) and small pulley makes it spin faster at idling rpms therfore it should produce more power when idling right?


I had already cut the 2g connector off and didnt have a choice as i needed the car mon and couldn't wait for the right size belt to come in.

[1990LTD]

why?

3g pulley was wider (6 grooves instead of 5 maybe? I don't recall exactly) and slightly taller than the 2g, and I didn't want to buy a belt since I had just dropped my last 50 on the alt, haha. It was also like 8pm when I was doing the swap and there was no way I was putting that 2g back in there only to do the swap the next day.

[1980c10]

I tried to swap pullies because my belt was slightly to short and wouldn't quite go but the 2g pulley hit the 3g case like it was to deep so I put the original pulley back on and grinded some matirial out of my alt bracket so I could adjust the alt farther in and then stretched the belt over and voialla perfect fit didn't even need to adjust belt tension sorry for no grammar btw I'm on the Iphone

[ÆJackacks]

yea i was thinking of grinding the housing to make more room for the 3G as my next option, original belt was short by just barely

[Archangel]

Oh geez, here we go again - why don't ya'll folks ask advice from those who make a living doing this kind of work, instead of just taking some random dude's word for it? Some 2G pulleys require the 3G alt case to be ground on the ribs and front bearing retaining flange, and some pulleys fit right in. Usually you cannot reuse the lock-washer under the shaft nut, so you put on some thread locker of your choice. Also, there are at least 3 different diameters of 3G pulleys, and also several 2G pulleys, whether the original belt can be reused or not depends on which exact combination you got, so before you go on a shopping spree you should measure pulleys, and not rely on internet boards to confirm things for you...

[gadget73]

... and not rely on internet boards to confirm things for you...

So says the guy on the internet board

[Archangel]

So says the guy on the internet board

But I was referring to the pulley diameters, there are quite a few combinations that can be had with those so the only way to really know if the factory belt will fit or not is by personally measuring the 2G and the 3G pulleys at hand.