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7520 john deere ,heavy smoke after it gets hot

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FRANCIS PAWELEK

01-14-2007 13:21:42




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hi guys ,i've had my 7020,404 motor rebuilt last month,on the way home the turbo went out ,it was only 2 miles away so i finished the drive,anyway behind me was the largest cloud of smoke i'd ever seen when it went,
well i put a new one on and have been allowing the motor to run daily at about 1000rpms for several minutes at a time,friday i took it for a ride and after i guess it heated up the engine,well the smoke started up again,
the engine builder told me theres oil in the aftercooler and in the pipe that still needs to be bvurnt out and this is going to happen after the motor warms up,and the pipe is hot,the turbo seller told me it needs to be ran harder instead of letting it idle so much while i'm doing other things to the tractor,thanks ,any answers as to what i should believe in?

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Mike M

01-15-2007 06:33:25




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to FRANCIS PAWELEK , 01-14-2007 13:21:42  
Lucky all the oil didn't get sucked out of the crankcase and ruin your new crank on that drive after turbo went out.



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francis pawelek

01-15-2007 11:04:44




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to Mike M, 01-15-2007 06:33:25  
it was about 100 yards,now the turbo seller is trying to tell me its ok,but i told him send it back,it has 1/8-1/4 inch play up and down in the shaft,man almost everyone i trust here in texas is going to shi,,,,...



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Moline_guy

01-14-2007 18:54:55




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to FRANCIS PAWELEK , 01-14-2007 13:21:42  
I have never overhauled an engine myself that was turbocharge, but i read in an oliver repair manual that you are suppose to run an engine for a short time after a rebuild before reinstalling a turbo. It said this way no metal fines are pumped into the turbo bearings, thats just what my I&T manual said, don't know if this is why your turbo went out after an overhaul or if its even posssible to run an intercooled engine without a turbo for a short time, just my .02, good luck.

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HAPPY DEERE

01-14-2007 16:34:16




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to FRANCIS PAWELEK , 01-14-2007 13:21:42  
ye like other people said i think if the engine runs fine when warmed up and holds good oil pressure you just need to load it down and run it for a few hours and there shouldnt be no more smoke



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francis pawelek

01-15-2007 11:07:01




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to HAPPY DEERE, 01-14-2007 16:34:16  
well i already pulled the turbo to find 1/8-1/4 inch slack up&down on the turbo shaft



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davpal

01-14-2007 16:16:15




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to FRANCIS PAWELEK , 01-14-2007 13:21:42  
If the bearing on the turbo has an oil pressure line going to it like I thing it does, when the bearing went out and seal it may have pumped an enormous amount of oil into the entire intercooler, exhaust system, muffler, everything is probably just loaded with oil. It had to be pumping at least 50 psi of oil pressure the rest of the 2 miles home. I am sure after you run it very hard and put it under a load and get it nice and warm for a few hours the smoke will be history.

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francis pawelek

01-15-2007 11:09:25




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to davpal, 01-14-2007 16:16:15  
well maybe,,but now after i pulled the turbo,i see 1/8-1/4 inch up&down play in the turbo itself,on each end of the new shaft,,i think its gone



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chrisfromsolitude

01-14-2007 14:13:00




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to FRANCIS PAWELEK , 01-14-2007 13:21:42  
Did he do a complete overhaul or just part of it? Also did a local deere dealer do it or an individual? Just wondering if he changed or checked the injectors while they were out. Also to breakin your new rebuild you should run it on a dyno about 15 min @ 25% power, 15 min @ 50% power then about half an hour at rated. Some people run them longer and some shorter but that is a good way to do it. This is usually how I break in a new engine. Check for blowby while on the dyno and be sure to check your coolant level when you get to cooled off. You could have oil in things but if the rebuilder did a good job he should have cleaned everything up before he put it back together and most of us run it on a dyno and break it in for you. Also make sure all of your air connections are tight and sealed up good. If it failed a turbo on the way home I would think that it had dirt somewhere that should have been cleaned up. The turbo should have also been checked when it was removed. If it was that close to going bad they most likely should have seen some signs of it. I'd check this stuff out and see where that gets you. Not blaming the rebuilder for faulty work, just looking at any possible angle. Hope this helps and good luck. Let us know what you find out.

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FRANCIS PAWELEK

01-14-2007 15:35:12




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to chrisfromsolitude, 01-14-2007 14:13:00  
wow,finally i get a person or 2 that will discuss this with me and not someone being an airhead like the painters were to me cause i got in on the wrong site,
ok,,the mechanic worked for jd,he went on his own cause he makes more money ,now,the parts were all new except for pistons and sleeves,
see i had a bad crank,he is very sharp on john deeres too,the 1st turbo went out on the way home,about 6 miles away,,unless it did that over there too,and he didnt tell me,,
after i replaced the turbo,which i did my self,,the one i pulled out was very wobbly,,i'm hoping that while the turbo is still new and under warranty,thats what it may be,
now as for the parts going back together,i cleaned all them,and very well too,
the intercooler,well the mechanic told me over the phone that theres still oil trapped in there from the 1st turbo going out,i seen a seep of oil in the gasket area is why i know that this is possible sir,thanks for writing ,i'm thinking of pulling the rubber hose that leads from the air filter to the turbo,and see if the shaft is wobbly,
if it is i'll pull the turbo,drain oil,and change the filter too,and add new oil again.

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chrisfromsolitude

01-14-2007 14:10:57




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to FRANCIS PAWELEK , 01-14-2007 13:21:42  
Did he do a complete overhaul or just part of it? Also did a local deere dealer do it or an individual? Just wondering if he changed or checked the injectors while they were out. Also to breakin your new rebuild you should run it on a dyno about 15 min @ 25% power, 15 min @ 50% power then about half an hour at rated. Some people run them longer and some shorter but that is a good way to do it. This is usually how I break in a new engine. You could have oil in things but if the rebuilder did a good job he should have cleaned everything up before he put it back together and most of us run it on a dyno and break it in for you. Also make sure all of your air connections are tight and sealed up good. If it failed a turbo on the way home I would think that it had dirt somewhere that should have been cleaned up. The turbo should have also been checked when it was removed. If it was that close to going bad they most likely should have seen some signs of it. I'd check this stuff out and see where that gets you. Not blaming the rebuilder for faulty work, just looking at any possible angle. Hope this helps and good luck.

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francis pawelek

01-14-2007 15:40:57




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to chrisfromsolitude, 01-14-2007 14:10:57  
turbo was good while at the shop,injectors ,well i'm not sure if they were cleaned but may have been,like i said the intercooler could have built up oil in it on my time when the original turbo was going out ,there was a very thick oily film at the muffler loop that connects to the pipe from the bottom after the turbo went out the 1st time,he also thinks some of that is in my pipe still,and when the right heat is back it will do it till its burned out ,

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Bob

01-14-2007 13:28:00




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to FRANCIS PAWELEK , 01-14-2007 13:21:42  
What he says MAY be true, but WATCH it... is it burning oil?



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Jon Hagen

01-14-2007 16:39:08




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to Bob, 01-14-2007 13:28:00  
You say you had a bad crank,was it just worn and needed grinding or was a bearing burned out? If a bearing was out,the turbo might have eaten some metal trash that was in the oil gallerys,or was just worn out and chose that moment to fail.
Also may pay to check that the turbo oil drain pipe is not clogged up. It can take some hard work to burn the motor oil out of the exhaust system. You really should work that new engine hard to seat the rings. Too much cold running and light load could ruin the rebuild.

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FRANCIS PAWELEK

01-15-2007 11:11:44




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 Re: 7520 john deere ,heavy smoke after it gets hot in reply to Jon Hagen, 01-14-2007 16:39:08  
well i'll recheck it,but after i pulled the turbo,,i'm finding 1/4 inch of play up and down on the shaft,this was a new turbo too



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