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John Deere Tractors Discussion Forum
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Question for jdemaris and others

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backwoodsfarm

04-26-2008 17:34:16




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I noticed while looking throught the archives that you had said something about the Roosamaster pumps causing a little blue smoke at startup, and that it could be fixed without taking the pump off. I have a 4040 with a DM pump and I was curious as to what the fix would be? There is no problem with the tractor starting or running at all, but it does puff blue smoke at startup. Goes away very quickly. Secondly, I just changed the injectors in my 1530 and now it seems to miss between 700 and 1000RPM. At idle speed(650) and above 1000RPM it runs like a clock. One of the injectors I removed was in very bad shape and carboned up really bad..... but it didn"t miss!! Ha, ha. Would new injectors bring out the bad side of an injection pump??

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J Schwiebert

04-27-2008 09:53:01




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 Re: Question for jdemaris and others in reply to backwoodsfarm, 04-26-2008 17:34:16  
If it is only at start up on a cold engine it could be compression. How does it act once the engine is warmed up and has been shut off like over lunch time.



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backwoodsfarm

04-27-2008 15:20:24




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 Re: Question for jdemaris and others in reply to J Schwiebert, 04-27-2008 09:53:01  
I can run either tractor for 10 minutes or all day, they both start great, hot or cold. I suppose I'm just being nit picky, but I just like to avoid problems befor they happen. Thank you.



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Roy Suomi

04-27-2008 04:32:30




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 Re: Question for jdemaris and others in reply to backwoodsfarm, 04-26-2008 17:34:16  
A puff of blue smoke ?? That sounds more like valve guides to me, or rings if it's a high hour machine.. It's conceivable that the injector pump is struggling to fuel fresh , high pressure injectors...Or the governor is searching for that sweet spot at that low rpm..



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