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  1. #1

    Default John Deere 755 blowby

    I have a John Deere 755 with 2100 hrs on a 3 cylinder yanmar. Tractor has quite a bit of blowby through the vent tube. I was wondering if this was a sign the motor needed rebuilt. Tractor is running with plenty of power. Just alot of smoke.

  2. #2
    Member
    Join Date
    Oct 2005
    Posts
    34
    Location
    Grimsby ..UK
    Tractor
    Schaeff HR16

    Default Re: John Deere 755 blowby

    Quote Originally Posted by Marty6645
    Tractor has quite a bit of blowby through the vent tube. Just alot of smoke.
    I would be preparing to rebuild it...
    If you've got blowby , excessive oil consumption and pressure loss, excessive smoke and maybe a loss of compression, its time to rebuild before it gets really expensive...Its only going to get worse and it could destroy itself in the process...

    Rob

  3. #3
    Member
    Join Date
    Oct 2005
    Posts
    34
    Location
    Grimsby ..UK
    Tractor
    Schaeff HR16

    Default Re: John Deere 755 blowby

    I just noted your glowplug thread...

    hard starting or failure to start (especially in cold weather) can be caused by faults other than worn engine (blocked filters ,glowplug failure etc) , but in your case I would expect that the two go together..

    I'd also try to return it to the guy you bought it off...


    Rob

  4. #4
    Veteran Member BTDT's Avatar
    Join Date
    Sep 2006
    Posts
    2,209
    Location
    North Texas
    Tractor
    IH M Farmall-propane powered, H Farmall (father-in-laws), Ford 1300 diesel

    Default Re: John Deere 755 blowby

    How much did you give for unit? Did you buy it knowing/thinking that a rebuild was in your near future?

  5. #5
    Super Member
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    Apr 2000
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    6,233
    Location
    central New York
    Tractor
    all makes and models

    Default Re: John Deere 755 blowby

    Diesels need compression to run. You might have a problem here. The blow by would tell you the rings are leaking compression which in turn would give hard starting.

  6. #6
    Elite Member
    Join Date
    Mar 2006
    Posts
    3,059
    Location
    Wisconsin
    Tractor
    2003 NH TN70A

    Default Re: John Deere 755 blowby

    How many hours?
    New or used?
    Have you done the oil changes yourself?
    Diesel rated oil?
    Bob

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