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Are these risers too far gone?

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    Are these risers too far gone?

    Hey I’ve just removed the risers off my engine and have found them in this condition; obviously they are very bad but I really need to have the boat in the water this weekend. I’ll be covering very little distance (max 3 to 4 miles) at about 4 or 5 knots. They don’t seem too be leaking badly, one manifold seems to have a small bit of water in the bottom but the other is dry. I don’t want to ruin the engine but will it be ok until I get new manifolds and risers
    1999 Bayliner Ciera 2655 Mercrusier 5.7 EFI Alpha One

    #2
    Lots of rust In cooling channels. You need to replace them soonest. If it were me and I had to run the boat now I would use a light wire to remove as much rust as you can without poking a hole in the casting. Go easy.
    Started boating 1965
    Bayliners owned: 26 Victoria, 28 Bounty, 32, 38, and 47 since 1996

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      #3
      Hard to tell from those pictures as you have not cleaned off the old gasket material, the walls may be very thin. I would not wait long to replace them.
      1997 Maxum 2400 SCR 5.7LX Bravo II

      Mike

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        #4
        Surprised you’re not overheating already. Passages look like they are almost completely blocked. Personally, I wouldn’t waste the time to put it back together because, IMO, they are already way beyond done. Depends on how badly you need to run your boat this weekend. I’d try to get someone else to take you out.
        1990 2755 - sold
        2005 275 - sold (now boatless)

        Comment


          #5
          if you see a small bit of water in the manifold, they may not be leaking too badly, but they ARE leaking.....and its only a matter of minutes before they begin leaking a LOT.

          the rust is so bad that the elbow and manifold cant be trusted to do their job properly

          you have the potential for damage due to overheating, and you have the potential for damage due to hydrolock/water in cylinders.

          any bit of the rust inside the manifold or elbow could pop loose at any time and leave a bigger hole for water to rush in...

          and even if you were to get lucky and not ruin the engine, the boat may become broke down and needing a tow..... either way its going to cost more time/money and the weekend will be ruined for you anyway...

          my opinion is, there is way more risk than there will be gain by trying to get another couple hours out of them.... I would plan my weekend accordingly and save myself some headache and money and get the boat fixed.


          NU LIBERTE'
          Salem, OR

          1989 Bayliner 2556 Convertible
          5.7 OMC Cobra - 15.5x11 prop
          N2K equipped throughout..
          2014 Ram 3500 crew cab, 6.7 Cummins
          2007 M-3705 SLC weekend warrior, 5th wheel
          '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
          Heavy Equipment Repair and Specialty Welding

          Comment


            #6
            +1 on what Rick and Centerline said.
            Don
            1995 Maxum 2400 SCR LUNA DE MIEL
            1988 Bayliner 2455 (sold)
            1976 Tahiti 16.5 I/O (sold)
            10 ft livingston (lost in fire )
            1987 18ft. Seaswirl cuddy (lost in fire)
            "Is it better to be on a boat thinking about God, or be in church thinking about boating?"

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              #7
              Thanks for the advice and I will definitely heed the warnings, should I replace the manifolds at the same time and can I do this in the water? I have a lift in booked and don’t want to miss it, it looks like I won’t have the parts before the weekend now
              1999 Bayliner Ciera 2655 Mercrusier 5.7 EFI Alpha One

              Comment


                #8
                Originally posted by william86 View Post
                Thanks for the advice and I will definitely heed the warnings, should I replace the manifolds at the same time and can I do this in the water? I have a lift in booked and don’t want to miss it, it looks like I won’t have the parts before the weekend now
                replace both manifolds and risers at the same time... they both rust away at the same rate.

                yes, you can change them with the boat in the water, as the water level in the exhaust "Y" tube is well below the elbow... check the flappers in the Y pipe also, as they may need replaced (or removed, if they havent already been taken out).....



                NU LIBERTE'
                Salem, OR

                1989 Bayliner 2556 Convertible
                5.7 OMC Cobra - 15.5x11 prop
                N2K equipped throughout..
                2014 Ram 3500 crew cab, 6.7 Cummins
                2007 M-3705 SLC weekend warrior, 5th wheel
                '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
                Heavy Equipment Repair and Specialty Welding

                Comment


                  #9
                  My engine is a mercruiser 5.7 efi, does anyone know if these will suit?

                  https://repowermarine.com/index.php/...l-5-7l-v8.html
                  1999 Bayliner Ciera 2655 Mercrusier 5.7 EFI Alpha One

                  Comment


                    #10
                    Originally posted by william86 View Post
                    My engine is a mercruiser 5.7 efi, does anyone know if these will suit?

                    https://repowermarine.com/index.php/...l-5-7l-v8.html
                    Yes they will work however I have not been a fan of HGE's quality I prefer OCSO, Sierra, OEM merc, barr.
                    1997 Maxum 2400 SCR 5.7LX Bravo II

                    Mike

                    Comment


                      #11
                      I would not put them back on...the now dried crud will have lost whatever integrity it had and pieces will surely break off and do more damage. Launch the boat and barge and tow it to your home dock...3 to 4 miles will go quick and it will buy you the time to fix it right. Your engine will probably benefit from a good flushing also.

                      Good luck...call it an "adventure"...call a party for the home port arrival...bow as you push it into your slip and crack open your favorite drink...(yes, VOE...)
                      1988 3888
                      Twin Cummins 6BT's 210hp
                      Onan 8KW

                      Comment


                        #12
                        Agreed with the above those are already leaking you can see the eroded spots on the gasket surface. If you want to use aftermarket, OSCO and BARR are good. If you are doing this job in the water I'd fab up a cover for the top of the Y pipe, do one side at a time and use a hose clamp to hold a plastic bag or similar over the opening of the y just in case the water level is higher than you might think or someone kicks up wake while you're doing this job. Also, prepare a pair of threaded rods or long bolts that are the same thread as the manifold bolts. Use them to hold up the manifold and keep the gasket aligned with the exhaust ports and bolt holes. Those exhaust manifolds are heavy, it's hard to get it all lined up otherwise....
                        88 Four Winns 200 Horizon 4.3 OMC
                        98 Jeep Grand Cherokee 4.0/Selectrac
                        07 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

                        Long Island Sound Region

                        Comment


                          #13
                          Put a fork in them they are well done.....
                          {Living our Dream}
                          John & Nancy
                          1988 Bayliner 38
                          175 Hinos 8.5 kw Westerbeke
                          Sandy Point Ferndale Washington

                          Comment


                            #14
                            Thanks for all the advice, its a hard pill to swallow after just buying the boat but I knew it would be a project beats rebuilding the engine.
                            1999 Bayliner Ciera 2655 Mercrusier 5.7 EFI Alpha One

                            Comment


                              #15
                              Originally posted by Centerline2 View Post

                              replace both manifolds and risers at the same time... they both rust away at the same rate.

                              yes, you can change them with the boat in the water, as the water level in the exhaust "Y" tube is well below the elbow... check the flappers in the Y pipe also, as they may need replaced (or removed, if they havent already been taken out).....
                              Verify this is the case, additional weight in the ass end (couple guys and their tools) can have the water level in the Y pipe very close and possibly above tthe level of the shutter/intermediate elbows coupler.
                              Dave
                              Edmonds, WA
                              "THE FIX" '93 2556
                              Carbureted 383 Vortec-Bravo II
                              The Rebuild Of My 2556 https://www.baylinerownersclub.org/f...76?view=thread
                              My Misc. Projects
                              https://www.baylinerownersclub.org/f...56-gctid789773

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