26 lbs boost, head gasket...poof

[vanbcguy]

Yeah, that's definitely weird...

Sorry to ask again, but what kind of breather setup do you have?

[rodpaslow]

I just have it coming from the valve cover with a 1" hose going to a Mann Provent filter unit and back into the intake side of the turbo.  There certainly wasn't any excess oil in the intake or exhaust side of the turbo taking all the pipe connections off.   I'm at a loss as to why all the oil...

[rodpaslow]

We'll I just finished pulling the turbo off and I think that's were all the oil came from.  You can move the shaft about 3/8 to 1/2" from side to side.  That can't be a good thing...lol! 

The next question is:  can I pull the injectors out of the head and crank the engine over like you would to clear a flood from a gasser, in order to get oil out of the cylinders because there has to be a large amount of oil there too?  I don't want to bend a rod or something like that from too much oil in a cylinder.  I bet the head gasket is fine.

That's a load off as I just have to get the other vnt I have ready to go in.

[Henchman]

Why?  You are 99% of the way into removing the head, don't stop now for the price of a head gasket and bolts!  Besides, if there is that much oil in the cylinders, you've probably already bent/broken something.

Ian

[wdkingery]

Why?  You are 99% of the way into removing the head, don't stop now for the price of a head gasket and bolts!  Besides, if there is that much oil in the cylinders, you've probably already bent/broken something.

Ian

This is my concern as well; if the intake was full of oil and the motor came to a slammin stop, and now won't run.. There's likely a bent rod somewhere

[rabbitman]

X2 on more damage inside.

Also if the shaft moves that far wouldn't the wheels be hitting the housings and thus producing metal of various sizes that would be going through the engine?

[rodpaslow]

Yeah, your probably right.  I think I will do that.  I have a new head gasket ordered and I have ARP head studs so i don't need new ones.  I might as well check everything.  How will I know if I have a bent rod?  Simply check piston heights?

This way I can start out with almost like new if all the oil and crap is cleaned out from the cylinders and striaghten any bend rods, if any...

[Henchman]

If you do have anything bent/broken, let me know.  I have rods/pistons/cranks for AAZs.  just pm me.

Ian

[rodpaslow]

Thanks for the offer, but it's a 1.6 td not a 1.9.  I'd be looking for 1.6 rods.  I'm hoping because it started after it had stopped initially that nothing is bent.  I'll be posting this weekend if that's not the case..

[rodpaslow]

Pulled the head off and I checked pistons heights and all were good within +/- .002" as best I could measure anyway.  I think what saved me was as soon as I lost power I hit the clutch pretty fast.  But there was enough oil in 2 of the cylinders had I tried to start it again I think it would have been a bad idea.  I also found a bolt on the intermediate shaft pulley I had missed tightening.  Oops, that could have been a catastrophe had it stopped turning.

So has any one else had a vnt turbo fail like this?  I'm a bit worried they are not as robust as the T3 the vnt replaced?  Luckily I had a spare one I traded the T3 for so I'm just getting it ready to put in...mak'in sure the egt is installed properly this time!

Will reduce pressure help longevity?  Is the vnt 17 any better?  I see they are a bit pricier than a new 15, but if it lasts it may be worth it? Also may be too large for a 1.6?

[wdkingery]

Sorry but I got confused (I have alot goin on lol)
The turbo took a dump and spewed the contents of your oil pan into the intake? Is that correct?

[rodpaslow]

Yup, I think what happened is there must have been some movement, maybe from over-speed of turbo (I've read 18psi steady is about the mac a vnt 15 should be able to handle reliably).  The seals must have gone as this overspeed happened and pushed about a litre and a bit into the intake and engine.

[fatmobile]

I hit 35psi on my VNT, a couple times and had no problem.
 I had a good block vent.

[R.O.R-2.0]

I hit 35psi on my VNT, a couple times and had no problem.
 I had a good block vent.

i hit OVER 35psi with a 1.5D that had a VNT bolted to it.. then shortly after, the head ALMOST left the block. 7 head bolt bosses were toasted. many cracked soo badly that they would not torque at all..

still drove the car home the next day with the head gasket blown in almost a dozen spots.. only took 5 gallons of water to drive 2 miles, im thinking i had some sort of a SMALL LEAK for it to use that much water.. lol..

retarded timing is the easiest way to over-boost these VNTs..

ever since ive had my engine timed good, its been hard to get the VNT out of its efficiency range..

[rodpaslow]

Efficiency range being what psi? I think I will start with 18 and see how it works.