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Old 02-01-2014, 09:14 PM
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How much shaft play?

Hey all, ok, I removed my turbo to instal a wicked wheel and the shaft has a pretty good amount of side to side play. (Maybe 3/16" of movement) and it has nearly and 1/16" of forward movement.

Is this acceptable for a GT38 turbo?

Im rebuilding it anyway because I followed youtubes advice and used a air wrench to pull the wheel and the bearing now grinds as you turn the shaft... but im just curious as to how much play there should be/is in the shaft.

~ The Maddawg
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Old 02-01-2014, 09:20 PM
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Not acceptable. Should be very little side to side. 1/16" end play is ok though.

Thrust bearing is ok. Journal bearings are bad.

Have you ever had feelings for a nun??? "Nacho Libre"
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Old 02-02-2014, 07:05 AM
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Look, there has to be side-to-side play (as wells as up & down) because that shaft is supported by oil pressure. It actually "floats" on oil. So you Need Room for it to do its job.

Did you have any other indication you had turbo problems? Is there any signs that the compressor has been contacting the housing? Scrape marks where moving parts have obviously touched?

If not, don't worry about it! If nothing hits, and oil's not leaking from the shaft, put it back together and enjoy your truck
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Old 02-02-2014, 11:21 AM
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Well, choot! Lol

I used an impact wrench to get my impeller off like youtube said and now the shaft grinds as you spin it by hand.....

That means I messed up the bearings right?

I had no evidence of any banging or scraping...
It spooled just fine and whistled like heck! I only had 12psi boost cause my up pipes were leaking bad so im not sure what it would have been holding...


~ The Maddawg

Last edited by maddawg89; 02-02-2014 at 11:24 AM.
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Old 02-02-2014, 11:45 AM
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Again, there Are no bearings...

What you have in there is a bushing. Without the LPOP supplying oil a dry bushing and not the way it would actually be running. BUT,,,, Grind? Shouldn't be doing That! I mean, you think it's coming from the Shaft? Is this reassembled? Could the New (and maybe now Full-Sized) compressor now be dragging on the housing?
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Old 02-02-2014, 11:58 AM
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if you spin the shaft a lot it will eventually grind. there is a tiny bit of oil in there when the truck is off.

basically no lubrication.

if you have the wheel on all the way, i would start the truck and let it get lubricated then check it again.
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Old 02-02-2014, 01:38 PM
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Quote:
Originally Posted by NoRalPh View Post
Again, there Are no bearings...

What you have in there is a bushing. Without the LPOP supplying oil a dry bushing and not the way it would actually be running. BUT,,,, Grind? Shouldn't be doing That! I mean, you think it's coming from the Shaft? Is this reassembled? Could the New (and maybe now Full-Sized) compressor now be dragging on the housing?


Are you on crack!!!:what::what:


There are most definitely bearings in there.
You need some Garrett 101 bub.

http://www.turbobygarrett.com/turbob..._ball_bearings

Have you ever had feelings for a nun??? "Nacho Libre"
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Old 02-02-2014, 01:57 PM
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Quote:
Originally Posted by blue99stroker View Post
if you spin the shaft a lot it will eventually grind. there is a tiny bit of oil in there when the truck is off.

basically no lubrication.

if you have the wheel on all the way, i would start the truck and let it get lubricated then check it again.
Cant start it.... lol no up pipes and tranny is on the deck right now

So basically its good, its just grinding because it has no oil?

Should I rebuild it? Or leave it?

~ The Maddawg
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Old 02-02-2014, 02:20 PM
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Quote:
Originally Posted by hucorey View Post
Are you on crack!!!:what::what:


There are most definitely bearings in there.
You need some Garrett 101 bub.

Journal Bearings vs. Ball Bearings | Turbobygarrett

Oh Dude,,, seriously, I've Never see anyone else here with more misinformation, that they're TOTALLY sure about, and will to "infect" others with.....

As for "Garret 101",,,,, are you aware of a 38R turbo? Do you know what the difference between the stock 38 (which we're talking about here) and the 38R IS? Know what the "R" stands for

Oh, and I still think you've got the MOST apropos Avatar of ANYONE! -hehehe
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  #10  
Old 02-02-2014, 02:36 PM
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Since you're so wise, what is the difference between the two?

~ The Maddawg
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