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Seawater pump on 5.0 Mercruiser-gctid390226

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    Seawater pump on 5.0 Mercruiser-gctid390226

    I just bought a 2007 246 Discovery that has the cool-fuel filter system on my 5.0 Mercruiser. I can see what appears to be the seawater pump pulley but I can't see the pump body. How do I check/replace the impeller in the pump? Do I have to remove the cool-fuel filter body/housing to get at the pump? Thanks for any help you guys can give me.

    #2
    It you have the Alpha drive, the pump will be in the lower part of the outdrive; the Bravo drive water ppump will be down low on the starboard side of the engine.

    IIRC, you remove the 3 front bolts, the 2 hose clamps, and remove the pump

    Comment


      #3
      I have the Bravo III outdrive so I know that the seawater pump in on the motor, driven by a single serpentine belt but the pump is apparently directly under the "cool-fuel" filter assy on the starboard side and is so close to the stringer that I can't even see the pump housing. I can only see the pump pulley and can feel the pump under the big square cool-fuel filter housing. There is no room to be able to see the pump no matter how low you hang your head over the motor. How in hell is anyone supposed to replace the pump impeller, short of pulling the motor or at least raising the motor above the level of the stringers?

      Comment


        #4
        Boy- I feels dumb

        next time I'll read the entire post before answering...

        I remember it was a PITA on my 2359....I had to do it all by feel.

        Comment


          #5
          Welcome aboard !

          Maybe one day a mechanic who has to change out parts on a engine such as yours will one day design a boat with access.

          Think of it like this to get to the water circulating pump on a automobile engine has the same problem, he has to remove 4 or 5 items and sometimes a motor mount, and jack up the engine. All with access from below. And the tire and wheel lining has to be removed.

          5 year old boat if your in saltwater your at the limit with the risers.

          Ok can you remove the exit hose on the raw water pump ? Remove it and start the engine if you have good water after the pump your good to go.

          " IF " your not overheating your temp gauge stays steady under 180 then this can wait till the end of the season.

          " If " your a wrencher then we can talk you thru what should be done at the end of this season.

          5 years there are a few extra things that in my lowly opinion should be done at the end of this season.
          Be good, be happy, for tomorrow is promised to no man !

          1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

          '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

          Manalapan N.J

          Comment


            #6
            Thanks Pete and Chief for the comebacks. I am a wrencher and have done most of the service on my earlier boats that had small motors, both Mercruiser (4 cyl, 1 brl carb, Alpha I drive) and Volvo (V8, 2brl carb, Duo-Prop drive) and didn't have much problem with servicing either one. Maintenance procedures were way simpler than on this 2007 5.0 Mercruiser. I'm also not far from my 70'th birthday and can't twist and contort as well as I did a few years ago, so can't see or get my hands on the seawater pump hose clamps or pump cover screws. I feel defeated and will have to finally pay someone else to start doing my maintenance and winterizing. Maybe someone who has gone through this ordeal with this model motor can give me the inside scoop of how they handled the situation. Remember this motor has the Cool Fuel filter system and the pump is directly beneath the filter husing and they are both right up against the starboard stringer. I might try to get tech assist right from Bayliner and see what they say. Summer is here.....enjoy!

            Comment


              #7
              Welcome aboard !
              Be good, be happy, for tomorrow is promised to no man !

              1994 2452, 5.0l, Alpha gen. 2 drive. Sold ! Sold ! Sold !

              '86 / 19' Citation cuddy, Merc. 3.0L / 140 hp 86' , stringer drive. Sold ! Sold ! Sold !

              Manalapan N.J

              Comment


                #8
                Seasong wrote:
                I just bought a 2007 246 Discovery that has the cool-fuel filter system on my 5.0 Mercruiser. I can see what appears to be the seawater pump pulley but I can't see the pump body. How do I check/replace the impeller in the pump? Do I have to remove the cool-fuel filter body/housing to get at the pump? Thanks for any help you guys can give me.
                It looks to me that you are asking how to access this area, and remove the pump body for inspection and impeller replacement.

                I think that the light bulb was out when the Merc boys designed this pump system.

                You mentioned that you've owned the Volvo Penta engine/drives before. Do you remember how easy pump and/or impeller replacement was with the V/P????

                Read on!

                Our own Doug C. had an issue recently whereby he needed a new Merc belt driven sea water pump..... perhaps very similar to your pump.

                Apparently the lead time for the replacement was weeks out.

                Not only was the lead time frustrating for Doug....., but the limited access to this pump each and every time an impeller needed changing, was also frustrating.

                http://"http://www.baylinerownersclu...ded to do!</b>

                This may or may not be an option for you..... but if so, it would be a one-time ordeal.

                .
                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

                Comment


                  #9
                  I wasn't happy when I used to have to drop the lower unit on my old Alpha 1 to replace the impeller so you know how thrilled I was when I saw how easy it was to do on my Volvo Penta pump mounted on the front of the motor....3 screws to remove the cover plate and voila! Even so, at least I could get to my impeller on the Alpha 1. There is no way this old captain is going to be able to replace the impeller on my particular 5.0 with the stupid "cool fuel" filter system sitting directly on top of the pump. Oh well, I guess someone has to help support the boat mechanics. :greedy_dollars:

                  Comment


                    #10
                    some car and boat designers should be forced to service the junk they come up with for at least one year for free. My son has a 2007 Chrysler Sebring with lifetime free battery installation (has to pay for the battery) as you have to take the fender off to get there. To change the headlight bulbs in my Detroit miracle Equinox I have to remove the grill and take the entire headlight out. Comment at the shop: it's worse with the Trailblazer, a lot more to remove. Crazy thing: the Equinox they sell in Europe has a small access hatch in the wheel well to change bulbs. The beauty of regulations: light bulbs have to be exchangeable with tools supplied with the car (they didn't want to supply a tool chest).

                    Comment


                      #11
                      Doug C. turned this...................



                      ............. into this, with the Johnson F6B-9 pump!



                      .
                      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

                      Comment


                        #12
                        Seasong wrote:
                        I just bought a 2007 246 Discovery that has the cool-fuel filter system on my 5.0 Mercruiser. I can see what appears to be the seawater pump pulley but I can't see the pump body. How do I check/replace the impeller in the pump? Do I have to remove the cool-fuel filter body/housing to get at the pump? Thanks for any help you guys can give me.
                        As most have commented, our raw water pumps are not accessible easily and definitely not by seeing. You must feel for the bolts that hold the pump to the motor and then you remove the entire pump, then you can change out the impeller. It is at least a two or three hour job for anyone who has not done this before.

                        The replacement for my engine required air purge attachments and that pump was back ordered when I first ordered it mid April to be able to order 1 May, following week, it was changed to mid June just to order it. That pump uses poor brass and my Merc dealer said you are lucky to get 350 hours out of a pump before replacing the entire unit. (MSRP $658 plus the impeller). The Johnson pump mounted on the crankshaft is less than half that cost and the access is a peace of cake. My engine has two raw water gauges for water temp. The original runs at 168* and the Merc Monitor, which is located closer to the raw water intake, runs at 152* which is in specs for this engine. My impeller is now four bolts from checking it. I can now pull the impeller anytime I feel I will not be using the boat so it does not get a 'set' on it. Takes 10 mins to remove and replace...

                        The Johnson pump is also made of tougher brass and lasts a long time before being replaced due to wear...
                        Doug ;}
                        MMSI: 338068776
                        "Go Aweigh to" Photos < click on red letters... 2001 Bayliner 2452 w/6.2 HO (paid for)


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                        Comment


                        • Bayliner246Pat
                          Bayliner246Pat commented
                          Editing a comment
                          Old thread, but I have the same problem. I’m thinking about switching to the Johnson pump, but I’m wondering what you did about the air purge system? I live near Seattle, and I definitely need the air purge system to work.

                        #13
                        AND.......... it's the only item on Doug's boat that is even close to being a Volvo Penta component!

                        Sheesh... can you believe that?

                        .
                        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

                        Comment

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