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  • ly6 getting warm/hot at idle

    bought a 2008 x80 with twin ly6 6.0 400hp motors. if i let the boat sit and idle more than 5 min or so it will try to get hot. as long as the rpms are up around 1200 it will idle all day without getting hot. boat also stays nice and cool going across the lake no matter how hard you run it. I've been chasing this down on the net, and talked to a few different people at mastercraft. getting a lot of different answers. some say a raw water hose re route kit, some say new thermostat housing up date, and last but not least, could be as simple as moving the temperature sensor because its reading air. has anyone had this problem on their ly6? if so any help would be awesome


    thanks Robby

  • #2
    what the the raw water re-route kit look like? Funny (odd) solution - indicates not enough raw water getting into system. How many raw water intakes does an X-80 have - 2?
    sigpic...A bad day water skiing still beats a good day at work...1995 Pro Star 205....

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    • #3
      You could possibly have a small air leak on the inlet side somewhere, like on a strainer. At higher RPMs the increased suction is able to overcome the leak. Are you seeing it on both engines?
      '96 ProStar 205 SD LT-1

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      • #4
        the x80 has 2 raw water pick ups on it, 1 for each engine.

        I've checked for leaks and i don't see any water dripping anywhere

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        • #5
          DOes it have sea water strainers?
          sigpic...A bad day water skiing still beats a good day at work...1995 Pro Star 205....

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          • #6
            it does and has been checked for anything that might be restricting the flow

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            • #7
              I don't expect it to be a flow restriction since it does fine under heavy running when high flow is needed. (I am frequently wrong in my assessments)

              Are both engines getting hot at idle, or just one?
              '96 ProStar 205 SD LT-1

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              • #8
                Does the overheating while idling happen every time you start the engines?

                I have seen this happen randomly on my LY6 but only after sitting after being warmed up. Doesn't happen on cold starts and only randomly. It only happens when I idle in gear for a few minutes and it will immediately cool off if I accelerate. No clue why it happens, the only thing I can think of is some kind of air pocket in the cooling system.
                2008 X-45 Pro Tour Red and White

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                • #9
                  both engines get hot, and both get hot almost exactly the same time, both engine have separate raw water inlets, engines are not linked in any way shape or form other than when i use perfect pass i guess

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                  • #10
                    the reading air comment is strange. why would there be air in the cooling system... have you contacted Indmar?
                    sigpic...A bad day water skiing still beats a good day at work...1995 Pro Star 205....

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                    • #11
                      Originally posted by elliott View Post
                      bought a 2008 x80 with twin ly6 6.0 400hp motors. if i let the boat sit and idle more than 5 min or so it will try to get hot. as long as the rpms are up around 1200 it will idle all day without getting hot. boat also stays nice and cool going across the lake no matter how hard you run it. I've been chasing this down on the net, and talked to a few different people at mastercraft. getting a lot of different answers. some say a raw water hose re route kit, some say new thermostat housing up date, and last but not least, could be as simple as moving the temperature sensor because its reading air. has anyone had this problem on their ly6? if so any help would be awesome


                      thanks Robby
                      How old are the raw water impellers?

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                      • #12
                        Impellers are 48 hours old

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                        • #13
                          I made the assumption it is open cooling. Is it open or closed cooling?
                          '96 ProStar 205 SD LT-1

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                          • #14
                            It's a open cooling system.

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                            • #15
                              read this thread...

                              http://www.mastercraft.com/teamtalk/...t=19606&page=2
                              sigpic...A bad day water skiing still beats a good day at work...1995 Pro Star 205....

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