Rebuilding a T28.. Possibly a problem (pic)

[DjLiquid]

This is my first time rebuilding a turbo and it seems pretty easy from what i've done so far but I ran into something that looks quite scary. Behind the compressor wheel housing and the seal plate, you can see the journal bearings. With the thrust removed, there seems to be a crescent shaped hole in the housing. It looks like it should be there, but at the same time it doesnt. You can see lines where it looks like its supposed to lead into the housing but where the hole meets the inner housing, its very jagged as if something broke off =/... Im afraid the turbo might be pooched. By the looks of things, it's a hole from which the oil can seep through if there's an overflow or something. Can you verify this?

[float_6969]

I would guess it belongs there. http://www.ecanfix.com/~mdhami....htmlThat is a mitsu turbo, but I think they still use garrett CHRA's. It looks a little different, but it's the same principle.

[Bwana]

I'm with Ryan, I think it's probably supposed to be like that.

[c-rad]

I would guess it belongs there. http://www.ecanfix.com/~mdhami....htmlThat is a mitsu turbo, but I think they still use garrett CHRA's. It looks a little different, but it's the same principle.

Mitsu makes their own chra's... but in any event, yes its supposed to be like that. Its a 270* thrust bearing. The 360* "RACE" bearings are upgrades.

[DjLiquid]

cool. I figured as much and continued on with the rebuild after I posted this. It's actually surprising how a turbo works and how easy it is to rebuild one once you have it in pieces. It should be done today if I get some time =)

[Rage_sixtynine]

DjLiquid,Hey, looks like you figured out the hole in your turbo, thats good to know, since i'm in the process of rebuilding mine. However it came to a screeching halt when I tried to remove the compressor wheel nut. How the heck do you hold the turbine shaft to loosen the nut? and is it normal or reversed threads? It appears to me that it is reversed threads, but I'm afraid to put the turbine shaft end in a vise to loosen the nut. It has that wierd triangle on the end of the shaft. I just can't get ahold of it without screwing something up. So, how did you do it? I think I can take care of everything else, but I just dont know the best way to get it off. Thanks in advance.

-Trent

[mbmbmb23]

DjLiquid,Hey, looks like you figured out the hole in your turbo, thats good to know, since i'm in the process of rebuilding mine. However it came to a screeching halt when I tried to remove the compressor wheel nut. How the heck do you hold the turbine shaft to loosen the nut? and is it normal or reversed threads? It appears to me that it is reversed threads, but I'm afraid to put the turbine shaft end in a vise to loosen the nut. It has that wierd triangle on the end of the shaft. I just can't get ahold of it without screwing something up. So, how did you do it? I think I can take care of everything else, but I just dont know the best way to get it off. Thanks in advance.

-Trent

Close ended wrench for both ends.....with the CHRA in a bench vise. I think it is reverse threaded....just spin the turbine wheel to see which way it would spin when exhaust hits it.....then turn the nut the opposite direction on the compressor nut.

[catchumdaylee]

if the turbo isnt balanced it will **** up ,i sure hope you marked the shaft and the wheel and even then it dont always work ,turbo spin up around 40,000 rpm if its not balanced just think about what will happen (like ebay turbos)my 2 cents good luck with that

-donnie

[DjLiquid]

if the turbo isnt balanced it will **** up ,i sure hope you marked the shaft and the wheel and even then it dont always work ,turbo spin up around 40,000 rpm if its not balanced just think about what will happen (like ebay turbos)my 2 cents good luck with that

-donnie

it's balanced, no need to worry =)

[Rage_sixtynine]

Dj,How do you know it is balanced? did you have someone rebalance it? if so, where did you take the turbo to have that done? Thanks again.-Trent

[mikesim]

Dj,How do you know it is balanced? did you have someone rebalance it? if so, where did you take the turbo to have that done? Thanks again.-Trent

we have a place called Western Turbo in winnipeg. they rebuild/balance turbo's as well as rebuild and test injectors.

[dattodude]

Yes, I learned the hard way that the nut on the turbo is a reverse thread.

The turbo was pretty roasted anyway...But I think that particular event was the start of my large spending spree.

[Rage_sixtynine]

Guys,I'm rebuilding a gtir turbo, I have it in pieces, should have the rebuild kit wed. I was wondering how you guys accessed the bearing, retaining rings and oil deflector on the exhaust side of the bearing housing. Under the plate(aka dog dish) appears to be the chra casting, all that I can see is a hole that the shaft slides into. According to the diagram at gpop shop it looks like I should be able to access it from the hot side without a problem. Also his instructions will tell you to flip the bearing housing over to access them(meaning accessing it from the exhaust side). I'll see if I can get a picture of it if you guys need it. Anyway, I'm just looking for some advice. Thanks for helping-Trent

[knightrider]

there are tiny snap rings holding the journal bearings in place. heres a decent write up on disassembly of a saab turbo, it uses the same t25 center cartridge. http://photo.platonoff.com/Aut...build/

[Rage_sixtynine]

Thanks Knightrider,looking at those pictures helped me out, however now I feel like an idiot I couldnt tell from my turbo that you could access it through that hole, I figured something had to come off, however now that I see it clearly in the pic, I'm good. Thanks again-Trent

[Rage_sixtynine]

For those guys that have rebuild the GtiR t28,I've got another question, reading instructions and looking at pictures and also looking at the parts in my kit, they all point to me having another snap ring on the outside of the exhaust side journal bearing. However when I disassembled the turbo, there was not a snapring, but a spiral ring on top of a washer. If I put this turbo back together as it was taken apart, then what will be in the 2nd groove on the turbine shaft? one of the grooves will have the piston ring, and according to pictures, there should be the spiral ring in the 2nd groove. But, i've already used the spiral ring to hold the bearing in. When I removed the shaft originally, there was nothing but carbon deposits in the 2nd groove. I just want to verify that this is correct, I dont want my turbo going boom right after I install it. Please guys, if you could help me out. Thanks.-Trent