[coneykid]

I have recently turbo'd my sierra. I've done full rebuild kit, minus pistons. New head, ect. While it wasn't turbo'd it didnt smoke under de-acceleration. Now every now and again it will. Really white smoke. I'm now on the hunt to find out why. I've removed the head because I had a coolant leak at the front of the head. I looked at the gasket and there is no tracking if oil. I checked my valve guide seals and the springs still there. What the he'll could it be.??. Has anyone ever come along this. Could it be coolent leaking into N1 pot??

[dm90]

im not a mechanic by any means

but it could be this???

http://www.auszookers.com/index.php?nam ... ic&t=17176

[xedent]

What condition is the turbo you used in how are the seals in it ?

[ajsr]

turbo oil seals shot?
have you checked the float on the shaft.
is your turbo oil drain clear flowing?
what boost pressure are you running ?
where is you rocker cover breather plumbed into?

[coneykid]

ajsr wrote:

turbo oil seals shot?
have you checked the float on the shaft.
is your turbo oil drain clear flowing?
what boost pressure are you running ?
where is you rocker cover breather plumbed into?

This is what is wierd!
Turbo compressor side is good. I haven't checked exhaust. Shaft end play and float is very good. I'm running 6, 7 psi. And I have a 16mm oil return line. There is not one drop of oil in the intake plumbing. And I'm using a catch can on my breather. But I do have a blow of valve that's not plumbed back in. Hell it has me beat. I do have a fare bit of blow by for a new engine though. But all was ok till I turbo'd.!!

[coneykid]

dm90 wrote:

im not a mechanic by any means

but it could be this???

http://www.auszookers.com/index.php?nam ... ic&t=17176

Hell, I not smoking that bad yet

[Fatzook]

do a compression test.

[coneykid]

Yeah I will. Thanks

[want33s]

Combusted Glycol will make white smoke.

[royce]

using brake fluid?

[coneykid]

royce wrote:

using brake fluid?

what the???

[coneykid]

want33s wrote:

Combusted Glycol will make white smoke.

yeah i thought that. I have a coolent leak at the front of the head so there is prob no reson i dont have one in..

[steak_knife]

coneykid wrote:

royce wrote:

using brake fluid?

what the???

Sucking it out of the booster..

[coneykid]

Ahh. Na. I had a better look and piston 1 alot cleaner. I'd say coolant but to make sure I'll drop out the pistons. Good fun!!!!

[coneykid]

Ok. This is very frustrating. I have removed my pistons. No cracks. Checked my head. All good. Check turbo. All ok. What the he'll is the problem..... The 2nd ring has a step in it. Does anyone remember Wat way the lip faces? That's all left.!.!.

[steak_knife]

coneykid wrote:

Ok. This is very frustrating. I have removed my pistons. No cracks. Checked my head. All good. Check turbo. All ok. What the he'll is the problem..... The 2nd ring has a step in it. Does anyone remember Wat way the lip faces? That's all left.!.!.

any I've ever seen is up..

once back together run it with the pvc hose to the tappet cover disconnected, could just be pressurizing the crank case..

[coneykid]

Up hey! Mine are down. So step facing down. I rebuilt a 12ht and 5L the other day and they were all domn. But they are diesel.
Were would I find out got sure??
I have a. Catch can and I can feel the blow buy so crank case presure should be good!

[steak_knife]

I keep the packet's the ring's came in when building eng's, just for lil thing's like this, do you still have em??

What brand?? ring's..

[joeblow]

all that lovely turbo heat and power (and awesome heat dispersing manifold) expanding the block

[coneykid]

joeblow wrote:

all that lovely turbo heat and power (and awesome heat dispersing manifold) expanding the block

Joe not being rude but it's a bloody drover, I don't have thounds to spend on my car but i have made many tuned length manifolds. Any way I am a bit imbarased but it's done, I rushed it!!! Any way you think that could happen?? I do have a bit cleaner front piston and vavle's. I just wish I could of seen a deffinet thing wrong!! Ahh..
Rebuild I think is ACL

[steak_knife]

ACL's are marked with a dot, dot to the top..

[coneykid]

Sweet. I'll remove one tommorow. Thanks.

[royce]

joeblow wrote:

all that lovely turbo heat and power (and awesome heat dispersing manifold) expanding the block

Alloy expands more than steel, assuming the block isnt filled with water that gets pumped to a radiator to keep its temperature stable

[coneykid]

All my exhaust temps and intake temps and water temps were checked and ok while on DYNO.

[royce]

can you get teh head vacuum tested or the guides checked?

[coneykid]

Yeah I might. Sounds like a good idea

[11_evl]

General rule I use for rings is

Think of the groves are a penis-
If the groove is IN its UP
If the groove is OUT its DOWN

[zuk85]

[quote="coneykid"]I have recently turbo'd my sierra. I've done full rebuild kit, minus pistons. New head, ect. While it wasn't turbo'd it didnt smoke under de-acceleration. Now every now and again it will. Really white smoke. I'm now on the hunt to find out why. I've removed the head because I had a coolant leak at the front of the head. I looked at the gasket and there is no tracking if oil. I checked my valve guide seals and the springs still there. What the he'll could it be.??. Has anyone ever come along this. Could it be coolant leaking into N1 pot??[/quote]

you said it your self. also when u said the N1pot was cleaner.