Date sent: Sun, 12 Mar 2000 19:29:11 +1000 From: Kevin Couter To: 80_series@sgiblab.sgi.com Subject: Re: [80] Toyota warranty - aftermarket turbocharging [OZ][chat] Send reply to: 80_series@sgiblab.sgi.com wufwuf wrote: > george, i am having a problem with my 24v TD intercooler. for some reason oil > coming out of the valve cover is sipping into the air cleaner, which the the > oil is burned up in the turbo, and leaving a blue smoke out of the exhaust. at > first, i thought the turbo was leaking oil, but it has been rebuilt and > tested. i believe the backup preesure coming from the turbo is sucking the oil > out. i have disconnected the hose between the valve cover and the air cleaner, > and a little oil is still coming out which the oil is burning of the engine. > any thoughts? G'day, I'm not George, but.... there is a fuel line under the tappet cover. If it were leaking, then a fuel / oil mixture would find it's way into the airfilter. Then the motor would run without unnecessary interference by the accelerator pedal, and the motor could run over the redline. To destruction. And the smoke would be blue. Norm would know all the technical names... Regards Kevin From: "Norm Needham" To: "80sCOOL" <80_series@sgiblab.sgi.com> Subject: Re: [80] Toyota warranty - aftermarket turbocharging [OZ][chat] Date sent: Sun, 12 Mar 2000 22:34:34 +1100 Send reply to: 80_series@sgiblab.sgi.com From: Kevin Couter > G'day, > I'm not George, but.... > there is a fuel line under the tappet cover. If it were leaking, then a fuel / oil > mixture would find it's way into the airfilter. Then the motor would run without > unnecessary interference by the accelerator pedal, and the motor could run over the > redline. To destruction. And the smoke would be blue. > Norm would know all the technical names... > "WHAM", "POW", "KABOOM" are the technical terms that spring to mind. The fuel line you describe is the return line from injectors. It lives outside the rocker cover on 12 valve models. The line is fragile, and must be removed to service injectors (as is the case in most diesels). An induced crack and leak in this line is normally just messy. But in the case of 1HDFT, with the line being hidden, the first inkling of a problem comes when the sump overfills with fuel and the engine starts running (uncontrollably) on its own lubricant. Yes, the smoke (and the owners bank statement) would be blue. But I don't think this is the answer to the question posed by Kevin (the other Kevin). That problem could be something as simple as the baffle in the rocker cover under the PCV hose allowing oil to pass. That's the first thing I would be looking at. George (I'm not him either;-) may well come up with other solutions. Cheers * Norm Needham * * Traction4 / ARB Northside * Sydney, Australia * Trac4@bigpond.com Trac4@telstra.com From: "Peter Mathew" To: <80_series@sgiblab.sgi.com> Subject: [80] Turbo Diesel Blowby Date sent: Sun, 12 Mar 2000 13:39:35 +1100 Send reply to: 80_series@sgiblab.sgi.com ----- Original Message ----- From: "wufwuf" > george, i am having a problem with my 24v TD intercooler. for some reason oil > coming out of the valve cover is sipping into the air cleaner, which the the oil > is burned up in the turbo, and leaving a blue smoke out of the exhaust. at > first, i thought the turbo was leaking oil, but it has been rebuilt and tested. > i believe the backup preesure coming from the turbo is sucking the oil out. i > have disconnected the hose between the valve cover and the air cleaner, and a > little oil is still coming out which the oil is burning of the engine. any > thoughts? "wufwuf" mentioned blue smoke in the exhaust and oil coming from the crankcase breather. When I first bought my '92 turbo it had around 40000k's on it. and was still under warranty. I also was disturbed by the puff of blue smoke which came from the exhaust when first moving off. I thought of oil being sucked from the crank as I had similar experience after I turbo'd my previous 2.8 litre Hilux. If you pull of the breather pipe going to the air cleaner you will see a fair amount of "blow by" especially with motor hot. I went to Toyota and they said this was normal especially on the turbo models. Maybe someone "in the know" could confirm this as I think it applies to all Turbos??? Peter Mathew '92 1 HD-T From: "George Couyant" To: <80_series@sgiblab.sgi.com> Subject: Re: [80] Toyota warranty - aftermarket turbocharging [OZ][chat] Date sent: Tue, 14 Mar 2000 05:49:20 +1000 Send reply to: 80_series@sgiblab.sgi.com > george, i am having a problem with my 24v TD intercooler. for some reason oil > coming out of the valve cover is sipping into the air cleaner, which the the oil > is burned up in the turbo, and leaving a blue smoke out of the exhaust. at It's quite okay to have some oil work its way through. It will leave an oily film throughout the inlet tract but shouldn't be the cause of oil smoke. > have disconnected the hose between the valve cover and the air cleaner, and a > little oil is still coming out which the oil is burning of the engine. If there has been a good deal of oil through the inlet tract, it will take some time for you to see any difference. The intercooler can become an oil trap and hold a heap of oil which will slowly work its way through. It's also a good filter for bits of turbine blades..... Kev and Norm have gone down the injector return line route which is a possibility. To check that, remove the rocker cover and pull the rubber tube off the front of the injector return line (external). Have someone leaning over the exposed rocker gear while you gently blow some compressed air into the return line. You'll see/hear bubbles of oil as it squirts out through any cracks or seals. It's rare to see them crack unless the return line has been treated with a heavy hand. More often than not, the little alloy seals either end of the return line bolts haven't seated properly and they leak. It may also be a combination of things. The injector timing may be a tad retarded and with a bit of oil from somewhere, you'll see blue smoke. To check this, make a note of the position of the injector pump timing. Advance the static timing until the period marks of the timing pump and timing gear case are aligned. Now take it for a drive and see if it smokes. Be careful because it's be producing lot more torque. Let us know what the results are. Cheers gc '97 HDJ80 - Melbourne Oz