Posted by robersw on October 05, 2013 at 13:37:38 from (173.242.231.36):
On my 6700+ hr 4440, about a month ago I noticed oil around the intake manifold gaskets and around the coupling hose between the turbo inlet pipe and the intake manifold. I took the air filter to turbo hose off and pulled on the turbo shaft to see how much play it had. It had ~3/8-7/16" play, so I figured it was just wore out.
Ordered a new aftermarket turbo and turbo exhaust adapter. Got them in on Thursday (9/26) and put them on last Saturday (9/28). I ran a piece of rope through the return tube to make sure it was not blocked. Attached the return tube, then filled the oil inlet with oil and spun the turbo with my hand until the oil and had run through. I repeated that 4 times. Then, I pulled the fuel shutoff out and cranked the engine to double check that oil was coming through the supply line (since it was leaking into the manifold, we know lack of oil flow isn't a problem). Then I hooked up the oil supply line, and with the fuel shutoff out, I cranked the engine until oil pressure was showing normal on the gauge, pushed the fuel shutoff in and cranked the tractor. I let it idle for 30 minutes and it ran great. I then went to about 1800 rpm and let it run for about 10 minutes, then went to full throttle and let it run for about 15 minutes. It was then that I noticed it starting to smoke around the turbo. I looked around and saw some oil on the exhaust manifold, so I sprayed it off and kept watching. Then I noticed oil around the turbo inlet pipe again and oil around the compressor housing mounting flange. I turned the engine off, pulled the air filter to turbo hose off and checked the play on the turbo shaft. It had ~1/8" of play. All that done, I assumed the new turbo has a bad bearing/bushing in it and is just as bad as my old one. I took the new turbo off, and after it cooled, there is no more play in the turbo shaft.
Got another turbo in this week, and it is blowing oil out the compressor housing as well. One difference, this turbo does not have end play when heated up. I checked the engine oil pressure, and am at 50 psi at 1900 rpm, right at the top of the tech manual spec.
Am I missing something? Did I do something wrong? Any advice is welcome.
Thanks
Scott
This post was edited by robersw at 13:39:38 10/05/13 2 times.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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