BBO - Why the notch in bearing?
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BBO - Why the notch in bearing?

  1. #1
    "Mad" Member Jet Mad's Avatar
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    Red face BBO - Why the notch in bearing?

    Why is there notches in the STD GM big end bearing and no notch in the Clevite 77?
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    Quote Originally Posted by Jet mad View Post
    Why is there notches in the STD GM big end bearing and no notch in the Clevite 77?
    Notches are the method of installing the balls. Every Bearing mfg. has his own described installation instructions towards setting the bearing. Some want notch forward, others want it towards rear. This has to do with the frontal load designed in the bearing.

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    NW Spectraholic Malcolm's Avatar
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    Those aren't jet bearings in those pics, Pops.

    Some original rods had groves out the mating surfaces to oil the cam.
    Last edited by Malcolm; 01-19-2010 at 07:34 AM.
    Malcolm

    75 Spectra 18
    77 Spectra 19 project

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    Senior Member 1975sleekcraft's Avatar
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    Default clevite 77

    i used clevite 77. they have held out for 7 years of punishment!!

  7. #5
    "Mad" Member Jet Mad's Avatar
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    Quote Originally Posted by Malcolm View Post
    Those aren't jet bearings in those pics, Pops.

    Some original rods had groves out the mating surfaces to oil the cam.

    Pops & Malcolm,

    The rod with the bearing notch is a 1975 BBO - Marine spec engine rod - stock std -

    Oiling the cam ? If I am not mistaken the oil feed for the cam comes from the mains on a BBO -

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Jet mad View Post
    Why is there notches in the STD GM big end bearing and no notch in the Clevite 77?
    I belive you will find the small round notches relate to rod big end oil "squirters" Tom

    http://books.google.com/books?id=TXE...age&q=&f=false

  9. #7
    "Mad" Member Jet Mad's Avatar
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    Tom,

    Thanks for the link, makes for intresting reading and it answered my question.

    Jet Mad

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