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Thread: Bolt size

  1. 01-14-2012 #1
    thunderstruck
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    Default Bolt size

    hey guys does any one know the size of the crack cap bolts on an inline 6 merc/mariner?
    cheers
    thunderstruck
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  2. 01-14-2012 #2
    Fastjeff57
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    1/4 - 28 fine thread. I use a quality Allen head bolt there.

    Jeff
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  3. 01-14-2012 #3
    thunderstruck
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    thanks for the reply
    are the heads on the standard ones 1/4" as well?
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  4. 01-14-2012 #4
    Fastjeff57
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    It's an Allen bolt. Takes a hex wrench.

    Jeff
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  5. 01-15-2012 #5
    Popa Sam
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    OEM bolts were 1/4-28 with 1/4 12 point head.
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  6. 01-15-2012 #6
    Fastjeff57
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    Correct. I was unable to locate 1/4 " x 12 point bolts, so I went with Allen bolts instead.

    Jeff
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