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Engine swap ....merc to Volvo

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  • Engine swap ....merc to Volvo

    Hey all! I’m a newbie to the site, but a long time reader that could definitely use your expertise!
    ive got a 1995 searay Sundancer 370 with 7.4 mercs. They are coming out as they are tired, and I have access to two 2006 Volvo 8.1L engines. I understand that the the engine mount pattern is the same, but will these engines bolt right up to my transmissions? What will I need to replace/convert to make this work? Or should I look for mercs again...

    thanks in advance

  • #2
    I looked up both motors and rear bolt pattern are the same


    Merc uses flywheel housing 865657A04
    VP uses flywheel housing 3852831

    496 Couplers and the flywheels are different then 7.4

    Merc coupler bolts to outside edge of flywheel

    VP coupler bolts to crankshaft along with flywheel

    Without more info, it appears just use your coupler and bell housing, and replace the crankshaft to flywheel bolts to the size Merc uses

    Also not: the 496 uses different exhaust manifolds then the 7.4
    Last edited by AllDodge; July 10th, 2019, 02:12 PM.
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

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    • #3
      Head exhaust pattern is same between 7.4, 8.1, and 8.2 so the 454 exhaust can be migrated to the 496s. Hoeever the 496 exhaust breaths better

      Flywheel bolt patterns are the same, however the 496 uses metric fasteners

      Bellhousing pattern is the same, however the 496 is M10 vs the 3/8
      Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

      1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

      Past Boats
      1970 Wooster Hellion - Merc 9.8
      2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
      1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

      What’s behind you doesn’t matter.Enzo Ferrari

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      • #4
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        Head exhaust pattern is same between 7.4, 8.1, and 8.2 so the 454 exhaust can be migrated to the 496s.
        There is sure enough info out there stating differently. Something about require drilling of new holes to make them work

        94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
        95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
        07 Seadoo GTX
        Merc Adults Only VP Adults Only
        G-Dad always said "First Liar doesn't stand a chance"

        Comment

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