[urq] Burning huge amounts of oil after turbo rebuild and new EM after 6 months of use.
urq at moregraphics.nl
Thu Aug 30 09:17:45 EDT 2007
Ado, thanks for the info. Just returned from the lab :-) and the results of
the crankcase ventilation test returned negative I guess: no smoke at idle
but just a little water from the not oily exhaust. I removed the iglo hose
at the valve housing (T-split) like you said and capped it. Curiously put my
finger on the now open valve housing end and felt vacuum was drawn, but
still no smoke.
Took out the small plastic one-way valve inside the valve housing to the IM
and also checked the valve housing itself for oil: they where just a little
wet and the valve functioned well, I guess it's perfectly OK then.
Plugs are not wet at all and have the perfect colour, there are some
deposits, but considering how old they are (18759 km), that's normal I
Valve cover seal and other oil seals are also absolutely dry.
Although I'm not sure what should have happened when disconnecting the
breather hose in either case, but my guess it's burning oil at the hot side
turbine seal and not in the cylinders and means it has to be rebuild again,
1986 quattro GV
1982 Coupe GL DD
----- Original Message -----
From: "Ado Sigal" <a.sigal at bluewin.ch>
To: "Maurits Jonkergouw" <urq at moregraphics.nl>
Cc: "Audifans" <urq at audifans.com>
Sent: Thursday, August 30, 2007 4:33 AM
Subject: Re: [urq] Burning huge amounts of oil after turbo rebuild and new
EM after 6 months of use.
> That's huge amount of oil burned, and if it started after rebuild, it must
> be to do with work done.
> - First establish where the oil is burned. If in cylinders, the plugs
> would be oily with lots of deposit, and if plugs are fine, then the oil is
> burned through hot side turbine seal. The exhaust will be oily in both
> - If oil is burned in the cylinders, and it wasn't before the work, it
> could be that crankcase pressure is created, and is pushing the oil
> through valve guides and oil viper rings into cylinders. To make sure that
> there is no pressure going to crankcase, simply disconnect the crankcase
> breather hose that goes from igloo to valve cover. Cap the igloo end end,
> and test for smoke. Might also check the other breather to IM connection,
> which is one way valve with metered orifice. Clean it up and make sure it
> works correctly. (If excessive crankcase pressure was created, as
> indication, the engine would be wet arround valve cover and other related
> oil seals.)
> -The routing of crankcase ventilation is the difference between GV and WR,
> not the exhaust.
> - Change of oil line plays no importance, if the leak on the old one
> didn't leave the engine without oil at any time.
> -Dialynx EM also controls wastegate through the bottom WG chamber, which
> is connected via same metal/high temp hose as the old one was. This only
> plays part how well WG is controlled, but plays no part in the oil issue.
> Well, test and let us know which one it is.
> Maurits Jonkergouw wrote:
>>Hmmm, oil consumption is getting worse each week since april this year...
>>Did a small test, perhaps you could comment on this:
>>Idle for 10 minutes > accelerate fast to 5000 RPM > huge cloud of smoke
>>from the exhaust.
>>Guys, what does this mean? I'm very worried about this new 1 liter oil per
>>500 km thing.
>>Also checked the 'michelin hose' for oil by disconnecting it at the iglo
>>and putting down a rubber flex hose all the way down to the turbo intake
>>and pulled it out to see if there was some oil on it, which is not.
>>Perhaps not the best way to check but didn't want to remove the tray below
>>the bumper and disconnect the hose directly from the turbo intake...
>>Things that might be of importance: one of the oil cooler lines has been
>>replaced, not sure it was exit or supply though. Turbo is a rebuild and
>>valves are readjusted to spec. My old exhaust manifold was cracked and is
>>replaced with Dialynx EM, all at the same time around december 2006.
>>Before the EM swap there was a hose present from the iglo to the
>>wastegate, but is now removed. The header on the iglo is capped off, the
>>header on the wastegate is not capped. To my knowlidge the wastegate is
>>now controlled by turbo pressure.
>>Another thing that I still don't understand: this is a GV engine, not WR,
>>and the only difference is some of the exhaust is routed back and reburned
>>or something like that to reduce CO. I've red that the original WR engine
>>used exhaust pressure to control boost level, I'm not sure if the original
>>GV uses the same technique and if the 'new' Dialynx method controlling
>>boost without exhaust pressure? (not sure how exactly boost level is
>>controlled withe the Dialynx EM), interfers with the original GV method to
>>reduce CO, in other words: this is bad or good.
>>Any comment or insights/thoughts are welcome, thanks.
>>1986 quattro GV
>>1982 Coupe GL DD
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