Big end and Main help required please





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  1. #1
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    Default Big end and Main help required please

    It's me and my damn old tractor again.

    I need to order bearings for it, so I measure tonight.


    All the Big ends measure 43.68 on the crank shaft. I know that they should measure 1.75", thus 44.45mm. The bearings are available in 0.010, 0.020 and 0.030 oversize. What does this mean? Is it measured on diameter or radius?

    My feeling is to just get the 0.03. If they fit, good luck for me, if not, I'll get the crank grinded. But I just to make sure it hasn't been grinded 0.04 before.


    The mains measure:

    1. 54.89
    2. 54.96
    3. 54.96


    I am still looking for info on what they should be.
    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

  2. #2
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    Default

    Are you sure about those measurements, seems very big for a Fortuner ?








  3. #3
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    Default

    It's the Gobabis edition!
    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

  4. #4
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    Default

    Uys dit is ou imperial sizes. Werk op diameter. skakel om na duim mates en dan sal jy weet of die crank nog standaard of reeds gesny is. Kyk wat sÍ die trekker se speks oor standard crank size.
    Last edited by grips; 2014/08/03 at 08:24 PM.
    It is not what you buy its what you build.

  5. #5
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    Default

    Yes.


    Die crank is 43.68 moet 44.45mm wees. Is dus 0.77 mm gesny ( 0.03") - duh Uys!

    Dankie!
    Everything is a hammer.
    Unless it is a screw driver.

    Then it it a chisel.

  6. #6
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    Default

    bearings/journal clearances are calculated by diameter. You need the specs of the crank and the standard oil clearance it runs. Alternatively take it to a good engineering shop and give them the oil clearance you want, and let them do it. Whatever you do, check the oil clearance yourself with plastigage before you re-assemble the motor - otherwise you risk a bolsup

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