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  1. #1
    Silver Member hernando's Avatar
    Join Date
    Nov 2003
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    225
    Location
    tennessee
    Tractor
    1540 massey ferguson

    Default engine knock

    i have a older gas john deere in has a knock in the engine i thought it was a rod but i was told it was carbon build up...how do you tell the difference between the two ? it does not make the knocking sound when under a load....using the loader ect....but when just driving it across a field it starts knocking...... any ideas ??? i dont want to do a rebuild unless i have too...thanks for the help bruce
    Bruce neal

  2. #2
    Veteran Member
    Join Date
    Apr 2011
    Posts
    2,406
    Location
    St. Cloud MN
    Tractor
    Deere 4100

    Default

    There was a recent post by someone who used Seafoam for carbon.

  3. #3
    Silver Member hernando's Avatar
    Join Date
    Nov 2003
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    225
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    tennessee
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    1540 massey ferguson

    Default Re: engine knock

    ok thanks i will check on that bruce
    Bruce neal

  4. #4
    Platinum Member
    Join Date
    Apr 2010
    Posts
    975

    Default Re: engine knock

    You can also feed in a gallon of water (in a metered slow fashion!) to a hot engine and it will clean off the carbon. I use a small diameter hose to a vacuum port. Keep rpms to PTO levels. It will cool the engine so you need to keep a watch on temperatures to keep the engine hot. It works better when hot.

  5. #5
    Silver Member hernando's Avatar
    Join Date
    Nov 2003
    Posts
    225
    Location
    tennessee
    Tractor
    1540 massey ferguson

    Default Re: engine knock

    changed the timing ....it helped alot.. thanks for the help bruce
    Bruce neal

  6. #6
    Veteran Member Jerry/MT's Avatar
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    Feb 2008
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    2,001
    Location
    Western Montana
    Tractor
    New Holland TD95D, Ford 4610 & Ferguson TO-30

    Default Re: engine knock

    Quote Originally Posted by hernando View Post
    i have a older gas john deere in has a knock in the engine i thought it was a rod but i was told it was carbon build up...how do you tell the difference between the two ? it does not make the knocking sound when under a load....using the loader ect....but when just driving it across a field it starts knocking...... any ideas ??? i dont want to do a rebuild unless i have too...thanks for the help bruce
    Check the intial timing and the advance function.

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