Duramax Diesels Forum Truck of the Week
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Old 11-08-2018, 07:29 AM
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Default Bad turbo?

So over the summer i swapped in a s366sxe. Now that it is getting cold, when i start and run it up to about 95-100 degrees in the collant, it is dumping a fair amount of blue smoke. Once slightly warmed, past about 100 degree in the collant, there is absolutely no smoke. Nothing sounds or feels wrong to my ability to tell. It has never done this before. Should i assume the turbo seals are bad?
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2006 GMC cc/sb
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5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
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Old 11-08-2018, 07:39 AM
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What did you have before? The stock turbo? How does this turbo kit source the oil for the turbo? Cam bearing (like the stock turbo) or a block plug? Does it have a restrictor?

The S300 frame turbos need an oil restrictor or they can push oil past the seals when oil pressure is high, such as on a cold start. Yours could be pushing oil on a cold start, then when the truck starts warming up, it starts burning the oil out of the turbo.
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Old 11-08-2018, 07:44 AM
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I’d pull the down pipe loose from the turbo and verify that is where the oil is coming from. And as Dave mentioned some turbos need a restrictor to keep from pushing oil. I had issues in Alaska with 400 frame turbos also.
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Old 11-08-2018, 07:44 AM
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Quote:
Originally Posted by DAVe3283 View Post
What did you have before? The stock turbo? How does this turbo kit source the oil for the turbo? Cam bearing (like the stock turbo) or a block plug? Does it have a restrictor?

The S300 frame turbos need an oil restrictor or they can push oil past the seals when oil pressure is high, such as on a cold start. Yours could be pushing oil on a cold start, then when the truck starts warming up, it starts burning the oil out of the turbo.
That is exactly what i was thinking with the oil pressure so high it pushes by. It pulls oil off of the front right on the block, whatever that spot is. It was where everyone else said to pull it. I dont have a restrictor, never even knew those were a thing.
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LBZ
2006 GMC cc/sb
HSP s366sxe, w/ ppe up pipes, AFE intercooler,
5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
All Rare Parts front end, DHD brace
EFI live and built trans by Diesel Day Dreams
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Old 11-08-2018, 07:47 AM
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When you threw a restrictor on your s400 did it stop the blue smoke?
Also, what are you guys using for restrictors?
How does it not restrict when the truck is warm or am i missing something?
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LBZ
2006 GMC cc/sb
HSP s366sxe, w/ ppe up pipes, AFE intercooler,
5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
All Rare Parts front end, DHD brace
EFI live and built trans by Diesel Day Dreams
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Old 11-08-2018, 08:22 AM
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You are pulling oil from a good spot, that's not the issue. My kits all came with restrictors, so I am not sure exactly what size is needed. Never thought to measure them.

The restrictor is just a small orifice in the feed line near the turbo. When the oil is cold and thick, it is under very high pressure, so it still goes through the small hole. When it is hot, it thins out, so even though the pressure is low, enough of it goes through the hole.
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Old 11-08-2018, 08:55 AM
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https://hspdiesel.com/single-kit-feed-line

This is the feed line that i was given to use. Bought a HSP kit. Doesnt look like there is a restrictor or am i wrong?
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LBZ
2006 GMC cc/sb
HSP s366sxe, w/ ppe up pipes, AFE intercooler,
5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
All Rare Parts front end, DHD brace
EFI live and built trans by Diesel Day Dreams
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Old 11-08-2018, 09:36 AM
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https://hspdiesel.com/4an-to-1-4-npt-straight

And the fitting.
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LBZ
2006 GMC cc/sb
HSP s366sxe, w/ ppe up pipes, AFE intercooler,
5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
All Rare Parts front end, DHD brace
EFI live and built trans by Diesel Day Dreams
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Old 11-08-2018, 10:13 AM
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Usually the AN to NPT adapter acts as the restrictor. That one has a pretty big hole through it. You could try getting a different adapter with a smaller hole, and see if that helps.

Though I would follow Burn Down's advice first, and make sure the oil is actually coming from the turbo. Otherwise you're chasing your tail here.
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Old 11-08-2018, 10:28 AM
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So if i pull the downpipe, what am i looking for?... Not a mechanic.
What size do you recommend for the restrictor?
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LBZ
2006 GMC cc/sb
HSP s366sxe, w/ ppe up pipes, AFE intercooler,
5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
All Rare Parts front end, DHD brace
EFI live and built trans by Diesel Day Dreams
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Old 11-09-2018, 06:23 AM
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https://www.summitracing.com/parts/v...xoCXgAQAvD_BwE

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Old 11-09-2018, 07:34 AM
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Quote:
Originally Posted by c5fourj View Post
So if i pull the downpipe, what am i looking for?... Not a mechanic.
What size do you recommend for the restrictor?
The turbine (exhaust side of the wheel will be oily and gooey) it will be a good time to make sure the bearings are still good as well. Pull the intake off so you can grab both ends of the turbo at the same time. Ck for in and out play and up and down of the shaft. Shouldn’t have much more than .001” or so in and out and you shouldn’t feel any up and down. Also grab the compressor side only and make sure it doesn’t contact the housing and spins freely while holding it as far over and turning it by hand.

If the turbo feels good then likely the seals are still ok and you need a restrictor.

You could be getting oil from the engine side as well but seeings the blue smoke started after the turbo install, I’d stick with t/s that.

As far as restrictors I just went to a -4 feed line from -6 and the s475 stopped pushing oil.
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Old 11-09-2018, 08:52 AM
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Ok thanks guys. Ill buying that piece from summit and see what happens, but ill rip the intake and downpipe off first and feel around to make sure its all tight.
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LBZ
2006 GMC cc/sb
HSP s366sxe, w/ ppe up pipes, AFE intercooler,
5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
All Rare Parts front end, DHD brace
EFI live and built trans by Diesel Day Dreams
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Old 11-09-2018, 09:07 AM
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Will that fitting thread into the 1/4 NPT? It says its a 7/16-24 in. thread.
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LBZ
2006 GMC cc/sb
HSP s366sxe, w/ ppe up pipes, AFE intercooler,
5" FLOW PRO, fass 150, 72" trac bars
Overloads pulled, 2" drop shackles, torsion key bolts pulled, on 285/55/20
All Rare Parts front end, DHD brace
EFI live and built trans by Diesel Day Dreams
Reply With Quote
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Old 11-09-2018, 09:09 AM
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Quote:
Originally Posted by c5fourj View Post
Will that fitting thread into the 1/4 NPT? It says its a 7/16-24 in. thread.
I didn't shop around for others but I think they make it in different threads. Or run a adapter from plumbing store

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06 GMC CC DRW-Gone
08 GMC CC DRW-Gone
New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
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Thanks to Blackout Performance

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