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  1. #1

    Default mercruiser 3.0 interchange help

    Ok have a 1990 bayliner with a 3.0 with a cracked block, having trouble finding a similar used 3.0. i can find the mid 80'S 140 which i know is same block just alot looks different. and i heard flywheel and coupler changed somewhere in early 90's. anybody have experience putting a older engine in place ? did find a mid 90'S motor but guy said the wiring harness is different is this true ?

  2. #2

    Default Re: mercruiser 3.0 interchange help

    The flywheel and coupler changed in 1990 even though yours is a 90 it could go either way as the cut over isn’t 100 % on the year depending on how many are in the que.

    https://www.michiganmotorz.com/3-0l-...nt-replacement

    In the bottom of the engine listing this outlines what you need to do to make a earlier engine work etc

    on the later engine if you keep the ignition that’s on the engine they will have the same ten pin plug at the boat harness. Bottom line if you have a complete engine as a take out it should be plug and play

  3. #3
    Join Date
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    Default Re: mercruiser 3.0 interchange help

    Quote Originally Posted by Riccky3 View Post
    Ok have a 1990 bayliner with a 3.0 with a cracked block, having trouble finding a similar used 3.0. i can find the mid 80'S 140 which i know is same block just alot looks different. and i heard flywheel and coupler changed somewhere in early 90's. anybody have experience putting a older engine in place ? did find a mid 90'S motor but guy said the wiring harness is different is this true ?
    Ayuh,..... Pull yer motor, 'n see whether it's the newer one piece rear main, or the older block,.....

    Then buy another motor that matches yer block,.....

    If an older, or newer, just swap all yer accessories over to the replacement, 'n everything will fit,.....
    In other words, change out only the Long Block,.....
    Any Grease is Better,... Than No grease at All....

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