Turbo Failure

[96 420a-t]

At least it was at one point. Found my smoking issue, I rolled in a new set of bearings and when I put it back together it was smoking terribly and spraying oil out of the hotside. I know why. Just thought i'd share with everyone.

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[VETTE_50_TH]

cool story bruh

 

[Bud92gsx]

I'm not a turbo genious,I know I'm looking at a shaft..But I don't know why it was spraying oil..I see the old stained oil on the shaft tho..

 

[96 420a-t]

It was starved of oil and had excessive play. Like almost 1/4 inch on the hot side.

 

[Bud92gsx]

Damm that a hell of alot of play..Could you touch the housing with the wheel?

 

[DECODER22]

new key chain

 

[96 420a-t]

I looked and the wheel shows no sign of contact. It's in front of my tv to look at.

 

[phunny]

At what position is the oil drain line on the turbo? Is it straight down or what?

 

[tec_41]

Are you running a restrictor?

 

[96 420a-t]

The drain is straight down. Only goes level right when it goes into the oil pan. I am not running a restrictor. Only 1/8inch stainless feed and 3/8 trans cooler line for the return.

Right where the hotside bearing rides there is a decent sized groove.

 

[JusMX141]

Only 1/8inch stainless feed and 3/8 trans cooler line for the return.

Huge problem there....your drain is horribly undersized.

That would cause the oil to push past the turbine seal, as evident by the outward-slung oil streaks on the backside of the turbine wheel. From there the exhaust heat and pressure would be able to make it's way into the cartridge, burning the oil that is supposed to be lubricating the journal bearing on the turbine wheel side, and discoloring the shaft as well.

I'm willing to bet the compressor-side journal bearing was much less worn than the turbine-side bearing....and this is the reason.

 

[96 420a-t]

Ok, so I need to steep it up. I just did this size because I had seen it done beforehand with out issue. So about how large would I be? Will 1/2" suffice?

 

[JusMX141]

Should be at least 5/8" I.D., which is supposed to be what -10AN lines are (10/16"), but they're still a little on the small side.

 

[bullettdsm]

what -10AN lines .

-10an is the norm. Should not be below -10an. Also, be absolutely sure that the bend in the tube/pipe/SS line is not a hard 90*. You need that oil to flow out of the line. A hard 90* would back up.

MB

 

[96 420a-t]

I guess I will have to see what I can do. I followed the write up on here and had a 1/2 inch bung welded on. Whelps ill give it the old college try.