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  1. #11
    New Member
    Join Date
    Jul 2011
    Posts
    12
    Tractor
    case ih 245

    Default Re: M with knock

    Well, the center main is BAD. At least it didn't spin.
    So far I can only find the main bearings for sale as a kit, can't find the center thrust bearing individually.

    So it looks like we replace all three mains.

    Thanks for all the advice.

  2. #12
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,155
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: M with knock

    i figured you'd find a main bad with a knock that din't go away with spark plug wire disconnect.. rods will quiet up pretty good when you pull the plug.. etc..

  3. #13
    New Member
    Join Date
    May 2013
    Posts
    2
    Location
    So. Dakota
    Tractor
    Farmall 460 Diesel

    Default Re: M with knock

    This is a long shot but the earlier M's had cast iron pistons. The iron pistons had looser tolerances so they made a knocking type noise. One of my cousins had one, it sounded like a 560 Diesel while idling!! Not a expert, just throwing out what little I remember from way back when.

  4. #14
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,155
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: M with knock

    can they knurl them pistons or not?

  5. #15
    New Member
    Join Date
    May 2013
    Posts
    2
    Location
    So. Dakota
    Tractor
    Farmall 460 Diesel

    Default Re: M with knock

    I don't know.

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