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Thread: OMC 70hp 3 cyl

  1. #1
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    OMC 70hp 3 cyl

    Does anybody have a written procedure with photos for removing the powerhead from a 90s OMC 3 cyl 70hp,
    My guess is it should only really be the 6 powerhead bolts, motor is already off boat so all electrics and fuel lines already disconnected?

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    Should just have the 6 bolts and 1 nut at the very back of the powerhead and the shift linkage. The nut is kind of tucked away in the back up under the head but you should be able to find it pretty easy.

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    Would anybody hazard a guess as to what crank an 1990 has multi or 4 spline? and Block oval or bridge port?
    I'm hoping its a 4 spine Bridgeport to convert to a sst60 setup.

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    Quote Originally Posted by AUS racer View Post
    Would anybody hazard a guess as to what crank an 1990 has multi or 4 spline? and Block oval or bridge port?
    I'm hoping its a 4 spine Bridgeport to convert to a sst60 setup.
    !990 has multi splines. 1968 thru 1988 have 4 spline, 1989 and up have multi spline.

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    You can swap the cranks.


    TMc

    1984 Allison XR2002
    1987 2.7 Fuel Injected Evinrude
    16" Taylor mid
    Brucato ACU.

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    What about the block oval or Bridgeport?

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    Oval port came out in 94

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    Quote Originally Posted by perfmarine1 View Post
    !990 has multi splines. 1968 thru 1988 have 4 spline, 1989 and up have multi spline.
    Does that mean I can use a crank from a 49ci in a 56ci?

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    I didn't check all the years but yes it should fit

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    Yes..

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    some of the early 49cu in also had multi spline in longshaft versions.

  12. #12
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    This is EXACTLY why I LOVE this site and the great minds swimming around in it !!! what a great response to a question you would try and ask on the street and probably never get a straight answer to. way to go guys !!!
    most overnite successes usually take at least 10 years


    Certified turd polisher,

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