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Opinions on manifolds and risers

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  • Opinions on manifolds and risers

    I think I already know the answer but what are the experts thoughts on the condition of these? The risers are pretty rough at the elbows but the manifolds actually don't look horrible to me but I assume they are the same age.

    1996 Bayliner Capri 2050 40th Anniv Edition - 5.7 Merc - UNDER CONSTRUCTION

    Check out my Youtube channel for a documentation of my 96 Bayliner restoration:
    https://www.youtube.com/user/jross82785

    How to rebuild a 2 barrel Mercarb:
    https://forums.iboats.com/forum/engi...ructions-video

  • #2
    Clean the gasket surfaces and show us again.... Can't see anything under the muck.
    xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    The world takes on a whole new perspective when viewed from 100’ below.
    1972 Bertram ‘Bahia Mar’ 20
    2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
    (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


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    • #3
      ^^^ Agreed. Clean everything up. Bang the rust scale out of the nozzle portion and see what you have. Might not be too bad.

      Are you in salted or unsalted water?
      Best regards, Ted . . . . Cape Cod, MA

      Current Boats: Formula 330 Sun Sport, O'Day Mariner Sail #3224, Sunfish
      Past Boats: Catalina 22 Sail #10531, Formula 242 Sun Sport
      Twin Mercruiser 7.4 LX MPI (0F802036, 039), Bravo 3's (0F806198, 199), Mercury 7.5 HP (1969), Johnson 4.5 HP (1980)

      My Boating Web Pages: http://www.tpenfield.com

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      • #4
        I'll clean em up later and snap some more pics..

        I boat in fresh water but the previous owner was in brackish (upper Chesapeake)
        1996 Bayliner Capri 2050 40th Anniv Edition - 5.7 Merc - UNDER CONSTRUCTION

        Check out my Youtube channel for a documentation of my 96 Bayliner restoration:
        https://www.youtube.com/user/jross82785

        How to rebuild a 2 barrel Mercarb:
        https://forums.iboats.com/forum/engi...ructions-video

        Comment


        • #5
          I'll clean em up later and snap some more pics..
          Ayuh,...... Long strokes with a flat file on the gasket faces,.....

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          • #6
            Wouldn't risk it any boat i get unless the risers look brand new i change them its worth the $600 rather then being out 1 day and blowing up your motor.

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            • #7
              Does new risers not also mean new manifolds?
              1996 Bayliner Capri 2050 40th Anniv Edition - 5.7 Merc - UNDER CONSTRUCTION

              Check out my Youtube channel for a documentation of my 96 Bayliner restoration:
              https://www.youtube.com/user/jross82785

              How to rebuild a 2 barrel Mercarb:
              https://forums.iboats.com/forum/engi...ructions-video

              Comment


              • #8
                Originally posted by Mad Props View Post
                Does new risers not also mean new manifolds?
                Not necessarily. I put new elbows on my engine about 6 years ago. Manifolds were still in excellent condition, so they stayed.

                The 'pointy end' of your elbows look ok, but it's the gasket surfaces we're most interested in. Once you clean the gasket material off them (both elbows and manifolds), use fine emery on a brickie's float to 'polish' the surfaces. What you are looking for is good shiny metal all the way across. If you see dull grey metal between the exhaust cavity and the water jacket cavity, that's compromised metal, and time for the rubbish bin...

                Chris......
                xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                The world takes on a whole new perspective when viewed from 100’ below.
                1972 Bertram ‘Bahia Mar’ 20
                2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
                (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


                Comment


                • #9
                  Agreed I'd clean up the mating surfaces and make sure you have good clean flat metal there, use a straight edge and feeler gauge to make sure its flat to less than .003". The water passages in the manifolds and elbows don't looked clogged by rust but I'd replace the elbows given what the part aft of the hose connection area looks like. Looks like you got chunks of cast iron coming off of them. So you might be able to re-use the manifolds and replace the elbows....
                  1988 Four Winns 200 Horizon
                  4.3 OMC Cobra

                  98 Jeep Grand Cherokee 4.0 Selectrac
                  07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                  "While air doesn't freeze....rust never sleeps"

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                  • #10
                    Got them cleaned up but forgot to snap a picture... manifolds actually look really good... not convinced the risers are salvageable... the mating part seems okayish but I just cant get past the coupler end... it's just flaking apart
                    1996 Bayliner Capri 2050 40th Anniv Edition - 5.7 Merc - UNDER CONSTRUCTION

                    Check out my Youtube channel for a documentation of my 96 Bayliner restoration:
                    https://www.youtube.com/user/jross82785

                    How to rebuild a 2 barrel Mercarb:
                    https://forums.iboats.com/forum/engi...ructions-video

                    Comment


                    • #11
                      Decided to bite the bullet. Placed an order for 2 new OEM risers (didn't spring for dry joints cuz my manifolds look like they have quite a bit of life left). I'll still try to remember to post some pics of the manifolds tho. Taking them completely off anyways to clean up/touch up the paint...
                      1996 Bayliner Capri 2050 40th Anniv Edition - 5.7 Merc - UNDER CONSTRUCTION

                      Check out my Youtube channel for a documentation of my 96 Bayliner restoration:
                      https://www.youtube.com/user/jross82785

                      How to rebuild a 2 barrel Mercarb:
                      https://forums.iboats.com/forum/engi...ructions-video

                      Comment


                      • #12
                        Sounds like a good plan, the outlets on your old elbows had rust chunks falling off and were not long for the world. Last thing you want is a season from now it rots through under the hose and then it starts pulling water back in. Next is rusty exhaust valves...
                        1988 Four Winns 200 Horizon
                        4.3 OMC Cobra

                        98 Jeep Grand Cherokee 4.0 Selectrac
                        07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                        "While air doesn't freeze....rust never sleeps"

                        Comment


                        • #13
                          Sign up today
                          Yup.. pay now or pay (a lot more) later
                          1996 Bayliner Capri 2050 40th Anniv Edition - 5.7 Merc - UNDER CONSTRUCTION

                          Check out my Youtube channel for a documentation of my 96 Bayliner restoration:
                          https://www.youtube.com/user/jross82785

                          How to rebuild a 2 barrel Mercarb:
                          https://forums.iboats.com/forum/engi...ructions-video

                          Comment

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