Here are the answers I got on CompD when I changed mine a couple of weeks ago


http://www.competitiondiesel.com/forums/showthread.php?t=48412


I ended up just getting it snug as it will tighten itself..... no problems so far...

 

yea lol i saw that but i wanted a definete answer. i can call the shop where i got it and he will tell me. he told me as i walked out the door but i forgot what he said.

 

ok well its 115 inch pounds. just to let you guys know for future reference

 

So much wrong or misleading info here...

I'll start with this:

-Is the turbine wheel itself, balanced like the Holset turbos? I doubt it is because it is used.
-Is the compressor wheel balanced? Some Garrett wheels are, some Schwitzer wheels are, some Holset wheels are - some aren't.

These two questions are critical when replacing any thing on the rotating assembly of your turbo.

Ideally, the turbine needs to come out, be cleaned, and balanced. The compressor wheel needs to be checked for balance also.

That being said, is your new compressor wheel a threaded wheel or does it take a nut?

-Threaded wheels on the small .25" shaft are 100 in/lbs with a compressor wheel at no less than 65 deg ambient temp

-Non threaded wheels that use nuts typically go around 105 in/lbs with a compressor wheel at no less than 65 deg ambient temp.

Garrett put out a service bulletin years ago to heat the compressor wheel, torque to 20 in / lbs, then turn 30 degs..... or something to that effect.

Most turbo rebuilding companies do not adhere to this bulletin.

 

its a threaded wheel. thats just what the turbo engineering told me to torque it to. he said it should be fine. this is just a stock backup turbo so im not too worried but i do want it right. im pretty sure the turbo wheel is balanced.