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  1. #1
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    2.5 crank big vs small bearing

    How hard is it to fit a 2.5 non-oiler 1.5 top journal crank into a later model 280 block? Do you just use the smaller 1.5 bearing and the matching top cap in the newer block? Or is it much better to stick with a big bearing crank?

  2. #2
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    the question is why put a small bearing crank in a 280 block you can use a small bearing crank in a big bearing motor just got to put a collar on it but I would not be comfortable with a small bearing crank

  3. #3
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    Because I have one already and it looks like a new big bearing crank is around $2000 :-(

  4. #4
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    Just use it...bearings fowwle the crank.....JMO...Just don't use plastic....Sand the rings for more.... did I say that????? heeHee..

  5. #5
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    Brookeland , Texas 75931 North of Jasper
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    Mercury made an adapter to install small crank to big 280 block I have the part number at home dunno if they still make it !!!Ive used it lots of times ...


    Jay
    Jay @ JSRE

  6. #6
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    http://www.marineengine.com/newparts...1159-832012T+2

    pretty pricey, it only adapts crankshaft with 1.5" upper journal to big bearing block
    death is certain; life is not


  7. #7
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    You can find good used big bearing cranks for around 800
    Erik Kiser

  8. Likes Michael J Giesler liked this post
  9. #8
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    Quote Originally Posted by patchesII View Post
    You can find good used big bearing cranks for around 800
    Thanks. Been looking but so far no luck. Seems like a rare item.

  10. #9
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    Quote Originally Posted by tripower View Post
    Thanks. Been looking but so far no luck. Seems like a rare item.
    I have sold about 10 in the last year if I get more I will let you know $650-$800 +shipping

  11. #10
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    Great, thanks!

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