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No Raw water flow 5.7 merc w/ alpha 1 gen 1-gctid808534

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    #16
    Okay, I'm going with a really stupid sounding question. Did you install the little key that mounts inside of the impeller against the drive shaft? Ask me how I know to ask this question.
    P/C Pete
    Edmonds Yacht Club (Commodore 1993)
    1988 3818 "GLAUBEN”
    Hino EH700 175 Onan MDKD Genset
    MMSI 367770440

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      #17
      LOL Yes I made sure the key was on the shaft and lined it up with the notch in the impeller.
      Grey and Catherine Wilfong
      KE5MWM and KE5MWK
      '91 2655 Ciera Sunbridge
      "Water Woof"

      Communications First, Soldiers Always

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        #18
        If you don't have water coming into the cooling tube where it exits the bell housing it may not be the drive itself

        There is a known salt buildup area where the drive meets the bell housing. If you can't find anything else then pull the drive off and check this passage. There is just an oring between the drive and the bell housing.

        Its a good chance to check your gimbal bearing and alignment anyway which is supposed to be a routine check

        Chay

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          #19
          check #9 #3 #2 ether the tube is cracked , the impeller housing wear plate or the housing itself is fugazied.

          I like to install the complete new housing with impeller.

          Speaking of the impeller it's aftermarket ?

          Reminding everyone this is a alpha 1 gen 1 drive he has, and i actually prefer it to the gen 2.


          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


            #20
            I replaced #3 it was dry rotted

            #9 is the guide tube that was fine

            #2 the housing itself was in good condition no cracks gouges wear or melting of any sort.

            Upper and lower wear plates in good condition

            I also replaced the slinger (72?)
            Grey and Catherine Wilfong
            KE5MWM and KE5MWK
            '91 2655 Ciera Sunbridge
            "Water Woof"

            Communications First, Soldiers Always

            Comment


              #21
              Try to submerge the drive past the water pump.

              You may have to dip the boat in a lake or sea.
              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


                #22
                Yep thats what I'm trying next.

                Quoted from my post #7: After some sleep on it, I'm thinking that the impeller is having issues priming. Perhaps I need a bit deeper tub. The current one comes up to the Cavitation plate but the drive usually is deeper than that in the water and at the cavitation plate the impeller may not be completely submerged. SOOOOO...either get it on muffs(difficult at my storage location) or take her out to the ramp and see what she does.(Thinking that would be better as it is closer to actual operation and doesn't have the extra PSI you would get from the hose.)Then if I get good flow to all the places I've already checked, I'll either be cooling good or Dig deeper
                Grey and Catherine Wilfong
                KE5MWM and KE5MWK
                '91 2655 Ciera Sunbridge
                "Water Woof"

                Communications First, Soldiers Always

                Comment


                  #23
                  I think your problem is trying to run it in a barrel. This really does not work with outdrives because due to the design of the transom mount you can't get the water intakes deep enough. Ideally you would want the drive submerged fully so the water will force the air out of the pump. Impellers will not pump against air. Use a set of good fitting muffs or you will just burn up perfectly good impellers.
                  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

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                    #24
                    We had an A1Gen1 for a while in our '86 Wellcraft. The Impeller in the raw water pump was problematic. Needed to be replaced regularily. The pump works by having the metal cover over the rubber pump a bit off centered. The water on the intake (wide side) is forced into the housing and pushed out through the narrow side up into the engine thermostat area as the engine turns. The problem is the rubber impeller blades take a set after a while and don't ssring back out when the impeller is approaching the wide side causing leaks and therefore no water to the engine. If you saw an Alpha "Gen II" impeller you would immediately see how much bigger and beefier it is. Our second boat , a '97 2355 is a gen II. Much better.

                    For you, I recommend either a new rubber pump or a whole new--pump. And buy a good set of ear muffs. Also, the pros often wont start your engine out of the water. They don't like to gamble on air getting air in around the muffs. I don't know if one can backfit a Gen II into an older boat which had the Gen I. It would be nice if they could! Hope this helps.

                    Don

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                      #25
                      If you had open / apart on a bench both the gen 1 and the gen 2 you would understand why the gen 1 is the superior drive.

                      Yes the impeller and housing should be changed out, a complete new oem one.

                      Can't seem to get that across to my friends as well as on this forum, trying to save a few dollars by just changing out the impeller.
                      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


                        #26
                        "grey.wilfong" post=808717 wrote:
                        Bounty, Nope no debris and thanks for the rundown...for what ever reason i was having trouble picturing the inner chambers of the T stat housing.
                        [color]blue wrote:
                        This first image was drawn up for a member with an AQ series Volvo Penta with the crankshaft seawater pump.

                        The T-stat housing (in the way that it directs seawater) is very similar to what you will have.

                        [/color]

                        [attachment]36260 wrote:
                        Raw water cooling T stat housing explanation.jpg[/attachment]

                        [attachment]36259 wrote:
                        Raw water cooling T stat housing explanation 2.jpg[/attachment]


                        Attached files

                        Rick E. (aka RicardoMarine) 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

                        Please, no PMs. Ask your questions on forum.

                        Comment


                          #27
                          Sounds like exactly what I may be looking at! All indications of centering of the shaft is slightly off center but if the blades took a set and pushing against water might be just enough to cause the problem I'm seeing especially at idle "displacement " mode. Intend to put in a whole new kit before my next outing.
                          Grey and Catherine Wilfong
                          KE5MWM and KE5MWK
                          '91 2655 Ciera Sunbridge
                          "Water Woof"

                          Communications First, Soldiers Always

                          Comment


                            #28
                            Bounty, Excellent info! I can infer the rest from the small differences. Thanks a lot!
                            Grey and Catherine Wilfong
                            KE5MWM and KE5MWK
                            '91 2655 Ciera Sunbridge
                            "Water Woof"

                            Communications First, Soldiers Always

                            Comment


                              #29
                              OK problem solved! Did a run all day temp guage spot on @ 175.

                              Did a run in the lake and got impeller flow but still overheating.Turns out It was the durn check balls. Found a used set as my unit didn't have any, and for grins and giggles popped 'em in and made sure they seated nicely. I'm figuring since mine weren't installed it was allowing too low of a pressure in the thermostat housing and letting too much water go directly to the exhaust elbows causing the overheat. it may have worked fine at higher RPM but I never got that far as it heated up rather quickly.

                              Problem solved and I am loving running the ol girl around the lake!
                              Grey and Catherine Wilfong
                              KE5MWM and KE5MWK
                              '91 2655 Ciera Sunbridge
                              "Water Woof"

                              Communications First, Soldiers Always

                              Comment


                                #30
                                Small note on my specific engine and thermostat housing. This specific version appears to be around 1989 or so thermostat housing design number II. It has the two additional hoses that connect to the upper exhaust elbows(presumably for cooling the elbow?) and apparently needs those check ball and for them to be adjusted properly.
                                Grey and Catherine Wilfong
                                KE5MWM and KE5MWK
                                '91 2655 Ciera Sunbridge
                                "Water Woof"

                                Communications First, Soldiers Always

                                Comment

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