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Manifold and Riser on a 3l

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    Manifold and Riser on a 3l

    How easy is it to replace the manifold and riser on a 3l Alpha 1 please?
    David
    1999 Bayliner 1750 Capri. 3l Mercruiser Alpha

    2014 Yamaha VX Cruiser

    #2
    Harder than a tire, easier than pulling an engine. Why do you think you need to pull them? Rusted bolts are going to be your biggest problem. I suggest using six point sockets and wrenches. There’s also a hook shaped screwdriver like device for pulling hoses that works well. For hose clamps I always try to use a screwdriver.
    Again, why are you pulling both the manifold and riser? Pictures really help.
    P/C Pete
    Edmonds Yacht Club (Commodore 1993)
    1988 3818 "GLAUBEN”
    Hino EH700 175 Onan MDKD Genset
    1980 Encounter Sunbridge "Misty Blue" (Sold)
    MMSI 367770440
    1972 Chevrolet Nova Frame off Resto-mod in the garage
    Boating on the Salish Sea since 1948

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      #3
      The 3.0 exhaust is easy to pull with lots of space to work.
      1997 Maxum 2400 SCR 5.7LX Bravo II

      Mike

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        #4
        Reason for asking is I always get my boat serviced by a marine shop. Never had any problems but so far just routine maintenance. At my last service they told me I would be due for new manifold and risers this year. (Next service). Quote was about $1,300 just for this job. I thought it can't be that hard? or is it? As a side note boat is used in salt water
        David
        1999 Bayliner 1750 Capri. 3l Mercruiser Alpha

        2014 Yamaha VX Cruiser

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          #5
          You can get the part for under $500. It'll take a few hours depending how rusty it is and your mechanical ability but it is a straight forward job.
          1997 Maxum 2400 SCR 5.7LX Bravo II

          Mike

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            #6
            FYI.... Your 3.0L engine should have a manifold and elbow only.

            Suggestion:
            Start and warm up the engine.
            Using 6 point tools ONLY, loosen the fasteners while warm/hot.
            Finish removing once things cool back down.

            When installing your new system, use automotive Never-Seez on the bolt threads.

            Rick E. Gresham, Oregon
            2850 Bounty Sedan Flybridge model
            Twin 280 HP 5.7's w/ Closed Cooling
            Volvo Penta DuoProp Drives
            Kohler 4 CZ Gen Set

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              #7
              Thanks for the replies. I think I will give it a go myself. Just got to find the parts at the right price. $700 for the manifold and $400 for the elbow here. OUCH. Might have to try and get one from the USA, depends on shipping charges.
              David
              1999 Bayliner 1750 Capri. 3l Mercruiser Alpha

              2014 Yamaha VX Cruiser

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                #8
                There are after market makers of manifolds and risers. I used Sierra units on my previous boat and found them to have good fit and function. I took a look for some 3.0 manifolds and found several types. Not knowing the year or serial number of your engine made an exact fit kinda tough. In searching for parts, the engine serial number is very important because changes are not made at the model year, they are serial number range based. The part number may not have been part of the change, but you want to be looking in the right bucket.
                I also saw Amazon had 3.0 manifolds with free or prime shipping.
                The shop wanting $1100 of $1300 for parts makes the quote more understandable, but, like you say, ouch!
                P/C Pete
                Edmonds Yacht Club (Commodore 1993)
                1988 3818 "GLAUBEN”
                Hino EH700 175 Onan MDKD Genset
                1980 Encounter Sunbridge "Misty Blue" (Sold)
                MMSI 367770440
                1972 Chevrolet Nova Frame off Resto-mod in the garage
                Boating on the Salish Sea since 1948

                Comment


                  #9
                  B.O.A.T.
                  Hell, Michigan (yes we really live in a city named "Hell" in Michigan)
                  2012 BR 185 - 3.0 TKS
                  1999 Chaparral 233 Sunesta Ltd., 5.0 Volvo
                  1985 Harris Flotebote Classic 240
                  1993 Yamaha Waverunner III VXR
                  1993 Yamaha Waverunner III
                  1995 Yamaha Waverunner III GP
                  1995 Yamaha Waverunner III VXR PRO

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