Cylinder Glaze

[TW]

I have about 15K mi on my 5 cylinder Audi TD, but the oil consumption seems a little much.  I broke it in like this http://forums.tdiclub.com/showthread.php?p=464223 starting with rotella non synthetic for the first 5000 miles.  Now I use rotell synthetic, and change every 3000 miles.  It burns a quart every 400 miles.  Would switching to a non diesel oil for a few thousand miles break up the glaze (if there is one)? Or is there some other easy method to lessen the oil consumption that does not involve pulling the head?  I don't know how something like  Restore will work in sub zero F. I've checked the turbo and used a factory rebuilt head.  The block was rebuilt by Topline.  I bought it on ebay.  I don't know what oversize pistons and rings are in it.

[jtanguay]

my 86 jetta got new rings without honing... took about 15'000km before it 'stopped' burning oil...

[itzdshtz]

Was your turbo rebuild? Take your intake pipe off, the piece that has the BOV on it  and look inside if there is exessive oil. Your rings should have seated by now. How much was it using when you had non synthetic Rotella in there?

[jtanguay]

well on my car anyway... it burnt oil quite nicely... switched to synthetic at around 13'000km and it stopped burning oil... not completely mind you, but only very little subtle changes.

[TW]

[http://vwdiesel.net/phpBB/viewtopic.php?t=1831 I think my case is like one of these where new rings fixed the problem.  There has always been some blowby in this engine.  It isn't the worst I've seen, but I've seen less. No oil at all in the BOV line. The oil consumption was about the same with nonsynthetic.  I just thought that a small abount of soot in the cylinder walls wolud break the glaze and give the rings another chance to seat.

[itzdshtz]

Just wondering, I noticed that you had some N/A intake valves for sale, did you install TD valves in your cyl head? If you did, were the valve stem seals replaced or are the originals still in there? They get damaged by the keeper grooves when you slide a valve out and back in and cause oil consumption.

[TW]

No, I used a factory rebuilt TD cylinder head that I purchased online.  I just checked to see if the blowby changed when the turbo wasn't connected to the intake manifold, no change.  When I installed the block, it seemed to me that the cylinder walls were too smooth and shiney.  Because it was professionally rebuilt (not by me), I thought there was a good reason for this.  Now I'm not so sure.  Maybe I should have used some 400 grit sandpaper on them.

[itzdshtz]

We used an abrasive powder that you blow into the intake of fresh rebuild industrial diesels, to set the rings of engines that had to run 100% power right from the start. It looks like Bon Ami.
You could try a bit of that.

[TW]

Where could I find some of this magic powder?

[craiggroombridge]

at your nearest cleaners supply ( ctire walmart zellers) ect. comet cleaner and some thin oil like 3 in one, start the engine and hold at 2500 rpm add the cleaner to the intake, about 8 fl oz., then drive it hard. this will start the rings to reseat. then change your oil... that how i do it at work

[Typrus]

You actually feed an abrasive into your intake....? Thats really quite scary.... Hope you do it post-turbo...

[TW]

I just hope something like this won't happen. http://forums.audiworld.com/a4/msgs/1567770.phtml

[smutts]

Bless! :mrgreen:

[itzdshtz]

That is hilarious!
I have a Impco Manual somewhere ( I will post it if I can find it) where they tell you how to seat the rings of a rebuild engine that is fuelled by propane only.
The problem is that the rings will not seat if it is run on propane right from the start.
They say to assemble the short block and put a startermotor on it. Then mix an abrasive cleaner like Bon Ami with oil and cover the cyl walls with it. Run the starter motor for a few hundred turns and clean up the cylinders. Put the heads on and it and you're done.
I have done this on race engines and it worked well.

[RabbitJockey]

i didn't hone my rabbit and it uses no oil  and has very little blow by, less than my jetta and my dads jetta, and neither of them use oil.  it did how ever use oil until i added  a cam splash guard, i think there was a problem with the oil to the cam rather than a problem with the rings seating, but that was on my car yours could be different, not to mention the splash guards are easy for me to get since any 8v from like 1990 to 2004 or so has one.  lots of stuff to check.  a quarter ever 400 miles is rediculous, thats a quarter every tank.