oil in the exhaust 1.6TD

[Doug]

The tail end of the pipe is gummy, oil consumption has shot up over the last month of usage. Car still starts well, idles fine, runs good, rarely see smoke behind car. I am suspecting the turbo bearing seal failure. Any comments or personal experiences. Had a shop try to tell me that it is piston rings, never saw a turbo seal fail. Do they need the work?? Pretty common in the heavy duty industry diesels though from what some friends tell me.

[LeeG]

Most likely blowby.  Pull the CCV hose off and go for a drive to see how much oil it spits out.   Turbo seals are pretty tough, how are the turbo bearings?

How many KM and how much oil is it using?

[Doug]

It used 2.5 litres of oil in a couple of weeks of maybe a thousand kilometers of average driving 60/40 highway/city. I was told that the engine had a couple of hundred thousand kms on it but who really knows seeing as it is not the original motor tied to the odometer in the car. The last time I checked the turbo had no detectable play. The blowby was not extreme a month ago when I put this thing on the road. I will pull the vent hose to see how much pressure is there. I guess it is hard to tell because there would be more blowby when the turbo is in boost mode and the engine is working. I suppose a couple of days with the vent hose to atmosphere should see the exhaust pipe dry up if the your conjecture is correct.

[LeeG]

Mine has been going through 2l / 1000 km for the last 50-70,000 km.  Before that was a little over 1l/1000, which is probably average for higher mileage motors.  Bulk oil is cheap and it still passes aircare, but it will surely get worse before it gets better.  

Another way to dry your exhaust is to get it good an hot....search for 'chimney fire' !

[burn_your_money]

Another way to dry your exhaust is to get it good an hot....search for 'chimney fire' !

LOL yeah that works well :twisted:
I drove around at 4000 RPM for a while the other day with a pile of junk in the trunk. It seemed to help

[saurkraut]

I wonder if you turbine side oil seals are coked up.  They're piston ring type.  I'm thinking that blow by should burn some what as it has to go back through the engine if you have you stock plumbing.

Maybe you could try a good diesel synthetic oil and see if it will disolve the coke on your turbo seals.  Might be a little spendy befor you see results.

[Doug]

Supposing that it is turbine seals coked, why do you think that the synthetic oil is going to help? Anything that I have read is that it has an even higher teperature of volatilsation (is that a word??) I wonder if there is an additive out there that might eat the coke? Maybe it just needs an all day drive??

[saurkraut]

Synthetic seams to clean engines better.  I used to run dyno oil (years ago).  When i would change oil, as soon as the engine was run, the oil turned black.  Ever since I went to synthetic, the oil stays relatively clean for a few days befor it turns blacker the a well diggers rear end.

The better volitillity is on your side too.  It means the oil stays liquide at highr temps, instead of turning to vapor.  When oil turns to vapor, guess what it leaves behind.

[jtanguay]

i dont think anything will clean out coked oil.  its basically hardened carbon.  jake had a post about his turbo, and the shaft had some crusty coked oil on it, and was not fun to clean.  moral of the story, watch egt's and let your turbo cool down.  oh and use synthetic!

synthetics generally have good detergent packages to clean engines as well... another added bonus!

[burn_your_money]

I haven't tried it yet but I defintly am going to once spring rolls around (I hate working on my car in the winter, even to do oil changes)
www.auto-rx.com
I did alot of reading on it a few months ago and it seems very impressive. I went through bobistheoilguy.com or some site like that and there were alot of people giving it really good reviews. Someone even did a bunch of before and after tests.

[Darkness_is_spreading]

Yea I wonder how they pull the sludge out though......  

I'm thinking this product is similar to the one found at canadian tire, called engine renew.... Smells like thinner...

It seems like a good product,  maybe I'll give it a shot later on

[LeeG]

If your engine really has sludgy deposists in it, anything that loosens them up can be BAD news.  Even changing the oil in a car that hasnt seen a change for some time is risky.  I once bought a 350 that I know for a fact hadnt had a oil change for a couple years, just top ups.  First thing I did was change the oil.  Within a week it spun a rod bearing after the oil gallery in the crank plugged solid.  On disasembly you could see how the fresh oil had been eroding the sludge and loosening it.  There was probably a gallon of sludge I scraped out of that block.

In hindsite, I've never been sure how I would approach the same situation again, but the options I see are:
-Drop pan for alook and maybe tear it down before it breaks
-lots of filter changes
-rig up an external filter + sump system so you can monitor it and then run it with oil & maybe some kind of solvent until the oil stays clean
-never change the oil again
-use a non-detergent oil


jtanguay is right, I dont think anything you can put in your oil will clean the coked up carbon from the turbo.....I had to immerse my center section in carb cleaner for a good week before I could even begin to work it apart, and that soaking didnt even put a dent in the carbon build up on shaft.

[addautomotive]

Prior to anything else, I would recommend removing the oil return line from the turbo and making sure there isn't any obstruction in it.  If there is it could cause your oily exhaust and high oil consumption.

Andrew

I actually had that just recently when I put the diesel engine in my samurai. I was spooked, thought I had a seized ring or something. Was adressing an oil leak on the turbo return line... no wonder it was leaking... it was 3/4 plugged. Put in a new return line, no more blue smoke & oil consumption.