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AQ Transom shield exhaust relief single to double?

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  • AQ Transom shield exhaust relief single to double?

    Hi everyone! I am redoing my transom currently and have my drive and shield off for the job. I have known for a while that the shield had a small hole drilled (maybe 1/4”-3/8”)for one of the exhaust relief. Not done by me! Is there any reason I can’t do a proper job and drill the hole properly to match the other side? This would essentially make a v8 shield? Am I missing something else? The hole is obviously supposed to be much larger and the inside edge has a small lip. I can post pics later.

    ive owned the boat 7 yrs and ran it this whole time time as is with no issues. Aside from the one little rubber hose breaking off the one side that had the proper factory exhaust relief. Can those hoses be had still? I’ll need two if I’m able to replicate the proper hole.

    thanks for any advice!
    1985 Bayliner 2450 Ciera Sunbridge
    Volvo Penta AQ225d, 280 outdrive
    Restore/Refurbish ongoing......

    link to my thread: https://forums.iboats.com/showthread...468790&page=12

  • #2
    I will get pics of the shield and y pipe later today to illustrate what I’m talking about. I’d like to fix it while it’s all apart and removed from the boat.
    1985 Bayliner 2450 Ciera Sunbridge
    Volvo Penta AQ225d, 280 outdrive
    Restore/Refurbish ongoing......

    link to my thread: https://forums.iboats.com/showthread...468790&page=12

    Comment


    • #3
      Well, looks there are more differences between the 4cyl and V8 shield. The holes aren’t in the same location vertically compared to the ypipe.

      Heres pics. I’m thinking it still may be possible to have it machined for the proper hole locations and fill weld the misaligned hole. Any thoughts?

      this is the misalignment with he y pipe

      AD70B868-08EE-4BCD-AFD3-7659F5040BE9 by Ciera 2450, on Flickr

      othr pics of the drilled hole someone added and also parts numbers

      650A8AA1-86E2-4407-B081-7ED7F78FEDBD by Ciera 2450, on Flickr

      CEE5214C-79BC-4D92-88B8-C8041FB7CADD by Ciera 2450, on Flickr

      08151A9B-B8A0-496D-8DAB-DE764BD2F046 by Ciera 2450, on Flickr

      shield part #
      8ACB36B5-14A5-44FC-A8B7-603521BD64EF by Ciera 2450, on Flickr
      1985 Bayliner 2450 Ciera Sunbridge
      Volvo Penta AQ225d, 280 outdrive
      Restore/Refurbish ongoing......

      link to my thread: https://forums.iboats.com/showthread...468790&page=12

      Comment


      • #4
        you will need to counter-bore the hole, however what are you trying to gain? the idle relief ports are simply there to prevent water from backing up the exhaust. most goes out the drive
        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

        Comment


        • #5
          Thanks for the reply Scott! So I’d be ok to just run as is? (I have for the many years.) How would I got about sealing y pipe to shield properly? They just Gobbed sealant in this area.
          1985 Bayliner 2450 Ciera Sunbridge
          Volvo Penta AQ225d, 280 outdrive
          Restore/Refurbish ongoing......

          link to my thread: https://forums.iboats.com/showthread...468790&page=12

          Comment


          • #6
            My line of thinking was that I’ve got it apart, fix it right.
            1985 Bayliner 2450 Ciera Sunbridge
            Volvo Penta AQ225d, 280 outdrive
            Restore/Refurbish ongoing......

            link to my thread: https://forums.iboats.com/showthread...468790&page=12

            Comment


            • #7
              You seal it with the correct rubber tube

              The changed the design.late (maybe in 1986), where the idle relief ports are solely in the Y-pipe outlet
              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

              Comment


              • #8
                Can you clarify Scott? Should I just buy the one “proper” side exaust hose and oring the other side?
                1985 Bayliner 2450 Ciera Sunbridge
                Volvo Penta AQ225d, 280 outdrive
                Restore/Refurbish ongoing......

                link to my thread: https://forums.iboats.com/showthread...468790&page=12

                Comment


                • #9
                  look at the parts diagram

                  http://www.volvopentastore.com/Conne...view_id.776337

                  I believe item 23

                  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

                  Comment


                  • #10
                    Sign up today
                    Thank you sir! Getting closer to reinstall and will probably have more questions.
                    1985 Bayliner 2450 Ciera Sunbridge
                    Volvo Penta AQ225d, 280 outdrive
                    Restore/Refurbish ongoing......

                    link to my thread: https://forums.iboats.com/showthread...468790&page=12

                    Comment

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