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2000 5.7 gsi pwtr possibly overheat gremlin.

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  • 2000 5.7 gsi pwtr possibly overheat gremlin.

    So last year i repowered. 5.7 psi pwtr. I was unable to make any trips as i have been chasing an overheat per my gauge.

    Things I've done. I have replaced every hose. New Thermostat. sea water pump. New threw transom fitting. new outdrive hoses. VP sx-M. New seals in the lower.

    I installed clear hoses on the sea water pump to look for air bubbles. bubbles are present.

    I thought it might just be my temp gage and sender so i installed a new gage sender and wire.. no change

    My temps running on the muffs hang at 160-165 then for no reason the gauge climbs to 180-190.. if i put it in neutral and increase the throttle to 1100 rpm for a few secconds, temps will fall to 150.

    I shoot the top of the thermostat housing with a temp gun and its about 120.
    The intake manifold closest to the temp sender is 112-115

    My port riser is about 98. my starboard riser is 125. taken on the top.

    My risers have always varied in temp.. both are brand new.

    Im stumped, My temp gun readings on the motor indicate im not to hot but the gauge says hey dummy don't cook your new motor..

    Any thoughts are greatly appreciated..

  • #2
    I installed clear hoses on the sea water pump to look for air bubbles. bubbles are present.
    Your sucking air, this would be my guess as to the problem
    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
    07 Seadoo GTX
    Merc Adults Only VP Adults Only
    G-Dad always said "First Liar doesn't stand a chance"

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    • #3
      Does the new t'stat have a hole in the flange for water to bypass?

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      • #4
        Originally posted by AllDodge View Post

        Your sucking air, this would be my guess as to the problem
        I agree... but where? I just installed brand new hoses today from the transom fitting to the p/s cooler. And from the p/s cooler to the sea water pump this am.. hoses fit very snug with clamps tightened down...

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        • #5
          Originally posted by aimlow View Post
          Does the new t'stat have a hole in the flange for water to bypass?
          I don’t recall.. it’s a factory replacement I believe 160 degree ... should I pull to check?

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          • #6
            did you replace the hose fitting on the drive itself? check that, because for years VP had issues with that fitting
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

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            • #7
              Plastic fitting in the pivot housing. Just like the OMC Cobra.
              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


              • #8
                Lou, they were not always plastic. for years VP used a white metal that would disappear after a few years.
                Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

                1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

                Past Boats
                1970 Wooster Hellion - Merc 9.8
                2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
                1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

                What’s behind you doesn’t matter.Enzo Ferrari

                Comment


                • #9
                  the SX series I think always had the plastic one (as they just adapted the OMC transom design) the aq had the metal one that corroded correct?
                  The plastic ones can crack if water gets trapped in there. Then air can get sucked into the water flow.
                  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


                  • #10
                    Originally posted by Lou C View Post
                    Plastic fitting in the pivot housing. Just like the OMC Cobra.
                    Yes I replaced that fitting, it is plastic. I also replaced the hose from that fitting to the thru metal transom fitting. I also pulled the lower and replaced the two rubber seals....

                    lou I read your suggestion about hooking up the muffs and pouring water from the motor side while someone watches for leaks in the drive.. haven’t tried that but might give it a go today

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                    • #11
                      I used their European web site because the US one is impossible to navigate.

                      https://www.marinepartseurope.com/en...-44-10147.aspx

                      part #18. AFAIK it has always been the same plastic piece like on the Cobra.
                      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


                      • #12
                        I bet you have seen this but if not google "Volvo Penta Overheat Diagnosis" Its a PDF document.
                        it tells you how to tell if air is being sucked in anywhere in the cooling system, and also how to determine if an overheat might be due to leaky head gaskets. I know you have a new engine but this is still worth checking for.
                        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
                          yes lou, i do have a copy. I believe im sucking air somewhere before my impeller but where? My p/s cooler is clear of any debris, all hoses are brand new and secured tightly.

                          Would it be recommended to pull the hoses and apply a layer of some type of sealant to aid in the connections being air tight?

                          Is it possible my new gauge and temp sender are playing tricks on me as the temps on the thermostat, intake, and risers are really not very hot?

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                          • #14
                            Originally posted by SD2600 View Post

                            I don’t recall.. it’s a factory replacement I believe 160 degree ... should I pull to check?
                            The SMALL bypass hole keeps the t'stat wax pellet always in consistent temperature coolant, and often eliminates wild temperature flucuations. Make sure the hole isn't covered by the gasket.

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                            • #15
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                              The way the V/P thermostat is retained in the housing (same exact part as OMC's) is with a rubber ring that holds the thermostat from underneath into the 'stat housing. No way it can block anything.
                              I wonder if your impeller housing can be sucking in air via a defective seal? When you checked for air bubbles, where did you put the clear hose? Before or after the impeller housing? If you install the clear hose between the P/S cooler and the impeller housing, this will tell you if there are any leaks between the lower unit and the housing (ie water transfer grommets in the drive, plastic fitting in the pivot housing transom hoses etc). If no bubbles then good. Now, put the clear hose between the outlet of the impeller housing and the thermostat housing, if you get bubbles then, that would cast doubt on the impeller housing seal. Might be worth a re-check to narrow it down.
                              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

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