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Old 02-25-2014, 12:30 PM
elliott elliott is offline
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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
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Old 02-25-2014, 01:37 PM
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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?
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Old 02-25-2014, 03:25 PM
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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?
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Old 02-25-2014, 04:15 PM
elliott elliott is offline
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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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Old 02-25-2014, 04:31 PM
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DOes it have sea water strainers?
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Old 02-25-2014, 05:29 PM
elliott elliott is offline
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it does and has been checked for anything that might be restricting the flow
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Old 02-25-2014, 05:41 PM
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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?
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Old 02-25-2014, 05:43 PM
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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.
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Old 02-25-2014, 05:47 PM
elliott elliott is offline
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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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Old 02-25-2014, 06:34 PM
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the reading air comment is strange. why would there be air in the cooling system... have you contacted Indmar?
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