Pressed my ati onto the crank and it bottomed out. The crank looks to be about 1/8" farther down, is this right? Is it suppose to sit flush of sit out off the crank a little bit?

 

This isnt mine, but the hub looked pretty much like this and i thought it should be in about another 1/8 so the tapered part is closer to the seal?

 

The ATI is a different length than stock. It will not be flush with the end of the crank, and neither will the stock pulley. Here is the GM procedure for installation, the depth of the crank is one of the measurements used to verify that the hub is correctly installed. The ATI is slightly different and you would have had to measure to figure out the correct number. However, if you are fully seated you should be OK.

One thing to be mindful of. Once installed the ATI doesn't remove with a three jaw puller. Rather, the puller needs to be a larger version of the steering wheel puller.

Bottom photo shows the ATI after removal. Notes are below the photo. :thumbs:











This photo shows the removal tool required for the ATI damper. Also, there is a round piece of metal that is placed against the end of the crankshaft to push on for removal. This eliminates and loading on the crankshaft threads.

 

I already pulled it back off because i felt it was wrong because it just seemed so far out. It might just seem that way because its a conversion. When i look at the oil pump gear it has anti-seize on it which tells me it was all the way seated

 

What kind of metal is used for that ATI removal? It looks like an electrical box knockout... But I imagine you need something a bit beefier.

 

I just used a 5 ton 3 jaw puller, but back to topic. Now i look at this and i think i might have had it right

 

I guess the pictures i see where it is close to the front cover are corvettes?

 

The procedure above is for the Vette, the f-body is the same but the measurement might differ. Never really looked at that section of the manual.

 

It's actually about 3/8" thick piece of round metal stock.

 

Measured how much it sticks off the end of the crank and its about 0.2, is this normal?

 

I'm not sure if this will help, but I'm in the middle of replacing my h/c and took a picture of the crank pulley before I took it off. Maybe it'll work as a reference?




It's a bit blurry though and the AC belt is still on. Sorry.

 

The GM procedure above shows the maximum of 0.176". I know the ATI hub length is different but can't find my installation notes from 2005. Your number doesn't seem unreasonable but you can only verify by knowing the stock length and the ATI length and then figuring out a new depth.

 

This is a new motor build and i dont have an oem balancer handy to measure

 

The measurement is just a double check of bottoming. If you otherwise follow the GM procedure, it will be bottomed against the oil pump drive, which is what you want. I wouldn't get too hung up on this, as there will be a setback of the crank inside the ATI hub.

Not sure if you can do this, but a bright flashlight shining down the key slot might help you see that it is bottomed. It's a long shot, but nothing has to be disassembled to try it. Other option is to measure the distance from the front of the hub (where the bolt will touch, see figure below) with a small metal rod (coat hanger, etc.) to where you contact the oil drive by sliding it into the keyway in the hub. Get that measurement and then call ATI and get the hub length (their tech support should be able to pull this number). That will tell you that it is bottomed. Hope that makes sense.

I wouldn't pull it apart again.

 

My crank is keyed all the way down so thats a no go. I know its bottoming out, just looked like this

 

I think that looks OK. Don't have photos of mine with the bolt out but from memory it looked similar,

 

It looks that way, but it's right. I pulled mine on and off three times to make sure.

My serpentine belt lined up perfectly, and I have no noise or belt squeal.

 

Haha yah i pulled mine off 3 times and broke 2 pullers doing so because i wasnt sure

 

Now i have a new problem, the bolts that go through to pulley into the accessory pulley dont get tight? They just spin like they are stripped?

 

You're in the wrong holes. There are 6. 3 for the balancer to hub and three for accessory pulley to the hub. Swap them.