Oil in turbo pipe s475/stock

plowboy_lbz

plowboy_lbz

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I've got an epr s475/stock twin set up. I pulled the mouth piece off of the stock turbo because it was leaking and noticed a few drops of oil and an oil film on in the inside of the pipe connecting the s475 to the stock turbo. PCV has been rerouted so the oil is from the low pressure turbo. I bought the kit used (said it had 2,000 miles on it) and it has a total of 5,000 miles on the turbo. 95% of the time the truck stays below 40psi of boost.

Shaft play seems minimal. Compressor doesn't rub the housing. I also pulled the drain off of the oil pan and it didn't have any oil so its draining.
Is the turbo shot? on its way out? I've seen more than a few posts about s475's going out in twin set ups with very few miles. On a semi these turbos can run for several hundreds of thousands of miles, or even a million miles before need a rebuild. Why in a twin set up where its only pushing 15-20 psi of boost are they giving up?


On a side note for those that have an epr kit. Is there supposed to be an o-ring on the mouth piece that goes on the stock turbo? The kit didn't come with one, and there isn't a groove for one but it leaks like a bastard. I glued an o-ring on it with some make a gasket. Hopefully it holds.
 
xtremebikr04

xtremebikr04

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I'm not sure on the turbo, but if the mouthpiece is leaking that's never a good thing. It should be sealed as your loosing boost.
 
mike diesel

mike diesel

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Sep 6, 2012
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Yes should definitely have an oring on it. Using some rtv should work fine as long as you let it fully cure before driving the truck so it doesn't blow the rtv out.
 
IOWA LLY

IOWA LLY

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Feb 23, 2007
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Your own post has answered your question.

Boost leaks destroy turbos by over speeding them.

Seal the mouthpiece with silicone, or have a machine shop cut a groove in your mouthpiece for an o-ring.
 
IOWA LLY

IOWA LLY

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You said the mouthpiece to the stock turbo was leaking because there is no o-ring. So you have a major boost leak from the atmosphere charger (the S475) and that is most likely what damaged it. If you don't have boost to act as "backpressure" the turbo will spin much faster because you still have the same exhaust pushing it without anything holding it back.

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Kappa9012

Kappa9012

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if it's leaking oil, it'll continue to leak and feed your motor and stocker oil. might want to rebuild it.
 
plowboy_lbz

plowboy_lbz

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IOWA LLY said:
Hou said the mouthpiece to the stock turbo was leaking because there is no o-ring. So you have a major boost leak from the atmosphere charger (the S475) and that is most likely what damaged it. If you don't have boost to act as "backpressure" the turbo will spin much faster because you still have the same exhaust pushing it without anything holding it back.

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Click to expand...

Thanks. Makes sense when you think about it.



Well since the kit didn't come with an o-ring, and there isn't a groove for one I'm going to go out on a limb and say it never had one. Meaning its been leaking for the last 5,000 +/- miles, and the turbo is probably going to need a rebuild. Great design Trent........not.
 
Y

yellowchevy

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Sep 9, 2010
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plowboy_lbz said:
Thanks. Makes sense when you think about it.



Well since the kit didn't come with an o-ring, and there isn't a groove for one I'm going to go out on a limb and say it never had one. Meaning its been leaking for the last 5,000 +/- miles, and the turbo is probably going to need a rebuild. Great design Trent........not.
Click to expand...

At least the turbo didn't grenade and take out your stock turbo.

If you ever wanted to take a turbo apart to see how they work this is a good time. :D

Yellowchevy
 
plowboy_lbz

plowboy_lbz

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yellowchevy said:
At least the turbo didn't grenade and take out your stock turbo.

If you ever wanted to take a turbo apart to see how they work this is a good time. :D

Yellowchevy
Click to expand...

We took the stock turbo apart when I had it out and man it was a pain to get back together the first time. The s475 should be pretty simple.
 
plowboy_lbz

plowboy_lbz

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Well the make a gasket and an o-ring didn't work. It was too thick and couldn't get the clamp on. I'm going to machine a groove in the mouth piece to fit the o-ring.
 
custom8726

custom8726

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plowboy_lbz said:
Well the make a gasket and an o-ring didn't work. It was too thick and couldn't get the clamp on. I'm going to machine a groove in the mouth piece to fit the o-ring.
Click to expand...

Or get a wider clamp,, While I agree a machined O Ring is ideal, There are plenty of twin kits out there with out one. As long as its a tight fit without a huge void between the mating surfaces a good high temp silicone will suffice IMO....
 
S

S Phinney

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Aug 15, 2008
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Check forward to backward movement of the shaft with dial indicator. You shouldn't have more than about .006 play. If it is greater then rebuild it. Exhaust and boost leaks in a compound kit will cause oil to be drawn past the seal into the intake piping. Fix your leaks and check the clearances before just rebuilding it. I had the same problem before. There was not a issue with the turbos at all.

Sent from my XT1080 using Tapatalk
 
plowboy_lbz

plowboy_lbz

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S Phinney said:
Check forward to backward movement of the shaft with dial indicator. You shouldn't have more than about .006 play. If it is greater then rebuild it. Exhaust and boost leaks in a compound kit will cause oil to be drawn past the seal into the intake piping. Fix your leaks and check the clearances before just rebuilding it. I had the same problem before. There was not a issue with the turbos at all.

Sent from my XT1080 using Tapatalk
Click to expand...

I will check it tomorrow. As far as exhaust leaks go, when boosting up in drive and a buddy under the hood we couldn't see any smoke coming out or any soot on anything. But when I start it on a cold day there is a little smoke between where the up pipe connects to the turbo. Only see it for a few seconds until the pipes heat up. Should I be concerned?

My semi uses a 3 piece manifold and it will leak until exhaust heats up then it good. It's done since it was brand new. (Since the manifold was brand new i should say) Even took it a part and replaced one of the pieces with one that fit a little tighter but it still leaks when cold.
 
Josh2002cc

Josh2002cc

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Call the fabricator and see if this was a common issue. Maybe they know something we don't...
 
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