[Vwdiesel] trip with Jetta GTD

James Hansen jhsg at sasktel.net
Wed Mar 11 21:32:08 PDT 2015 

Yeah, I'd lay money on head gasket as well, but cooler leakage is easy to diagnose.
I've bypassed the coolant lines so they were off of the oil cooler, and drove like that for some time, and it turned out to be the head gasket anyway every time, despite hope and best intentions.  On examination of a cooler plate for the oil cooler, it turns out to be rather robust, unlike the head gasket in the oil gallery area. Hylomar spray might help in that area for longevity, you aren't supposed to need it on modern mlm gaskets, but Andrew is no dummy. 
-james

-----Original Message-----
From: Vwdiesel [mailto:vwdiesel-bounces at vwfans.com] On Behalf Of Bryan Belman
Sent: March-11-15 9:22 PM
To: Andrew .Libby; Hayden Chasteen
Cc: vw fans
Subject: Re: [Vwdiesel] trip with Jetta GTD

I had a 90 Audi 200 with the same water cooled turbo.  Never an issue with that at all and it was rusted to all hell on the outside.It is either the oil cooler/warmer or the head gasket.
Sad to say, bets are it is the head gasket.I have a known good oil cooler I will send you, change that first, much easier path then the external oil cooler setup and or changing the head gasket.
Rule out the EASY stuff first, I have, we have all made that mistake too many times.
It is a 1.6 stock size, I upgraded the size on my 1.9NA to the passat one, much bigger and it cools things a little better.
let me know if you would like me to send it down Hayden.  Not a problem at all.

 Bryan Belman, Pt. Pleasant, NJ
04 Jetta Wagon TDI PD BEW, 100hp, 5sp -- running :<)
04 Golf TDI PD BEW, 100hp, 5sp Tiptronic Auto -- running :<)
82 Diesel Westy 1.9NA 1Y -- running :<)
70 Type 1 Beetle -- Under Restoration forever:-)
      From: Andrew .Libby <libbybapa at gmail.com>
 To: Hayden Chasteen <dieseltdi at verizon.net>
Cc: vw fans <vwdiesel at vwfans.com>
 Sent: Wednesday, March 11, 2015 4:42 PM
 Subject: Re: [Vwdiesel] trip with Jetta GTD
   
Is your Jetta a Euro import GTD?  If it is North American engine then the turbo is not water cooled.  Regardless, I do not believe that the water cooled turbo has any seals that could leak coolant to oil.  I believe that the only way that would happen at the turbo would be a crack in the center cartridge.

Most likely is that the oil/water heat exchanger has failed internally.
You can take it out, plug one coolant opening, install a hose and tire valve stem/shrader valve in the other, insert the cooler into a bucket of wire and apply mild air pressure to the shrader valve.  Bubbles from one of the oil openings would indicate a failed cooler.  I'm sure if you did a search you could find a video of a vw cooler being tested.

Next most likely would be a failed head gasket that is allowing leakage between the high pressure oil channel between cyl 3 and cyl 4 and a nearby coolant passage.

A couple other less likely possibilities that you did not mention are a cracked block or a cracked head between the pressurized oil gallery and the coolant.

Bear in mind that for oil to enter the coolant, it has to be a leak between a pressurized oil area and the coolant.  A leak between the coolant and a non-pressurized oil area (valve cover/block) will send coolant into the sump rather than oil into the coolant.

On Wed, Mar 11, 2015 at 12:31 PM, <dieseltdi at verizon.net> wrote:

> Well I was going to spend this email talking about the great trip I 
> just took with my Jetta GTD and my little tent trailer that I restored 
> but when I went out to change the oil and check fluids, I discovered 
> that something bad HAD happened on the long trip.  Apparently on the 
> last leg home yesterday, I developed an oil leak into the cooling 
> system.  I know it started yesterday because the evening before, I 
> have checked the coolant to make sure I had plenty because I have the 
> cursed slow leak from the heater valve and there was nothing in the 
> coolant tank but coolant.  Well today I found a nice scum of black oil 
> floating on the top of the coolant and smearing the walls of the 
> coolant tank.  Now, just to set the stage, the car never overheated on 
> the trip, used only about ½ quart of oil and all gauges stayed within 
> acceptable limits including the EGT which I kept below
> 1100 degrees F post turbo.  So I guess my thinking runs in this order:  
> 1) Oil could be leaking between the seals in the head gasket,  It has 
> always been weepy since I got the car but no huge external shows of 
> oil.  2) something in the “oil cooler” has failed or 3) some seal in 
> the oil/water cooled turbo has failed. (I am hoping that this isn’t it 
> as I really don’t want to get a turbo rebuilt.)  So what say yea all?  
> I intend to flush out the system with some degreaser and stay easy on 
> the car until I figure out what to do.  Car runs fine, no real smoke 
> except on hard acceleration, engine sounds about the same, maybe a bit 
> “tinny” but nothing I can put my head around.  Really need the 
> collective wisdom on this one before I dive in.  Thanks, Hayden
>
>
>
> "God is not a diviner being or a magician, but the creator who brought 
> everything to life. Evolution in nature is not inconsistent with the 
> notion of creation, because evolution requires the creation of things 
> that evolve.” Pope Pius XII “There are many men of principle in both 
> parties in America, but there is no party of principle.”
> “I do not know if the people of the United States would vote for 
> superior men if they ran for office, but there can be no doubt that 
> such men do not run."
> “I cannot help fearing that men may reach a point where they look on 
> every new theory as a danger, every innovation as a toilsome trouble, 
> every social advance as a first step toward revolution, and that they 
> may absolutely refuse to move at all.”  Alexis de Tocqueville
>
> Proud owner of:
> 2014 Jeep Grand Cherokee Ecodiesel
> 1968 Beetle
> 1982 VW Jetta Coupe GTD "FrankenJetta"
> And many, many, many VWs; from a 1947 Beetle (13 Beetles total), to 
> Vans
> (5 - 3 splitties  2 bay window (both were campers), 1 Vanagon Westy, 
> Rabbits (3), Karmen Ghia (1), Jettas (11), Passats (2), Dasher (1), 
> New Beetle (1), Rabbit Convertible (1) and Rabbit Pickups (3) most now 
> gone but not forgotten.
>
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