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90 Sport Nautique Overheating at High RPM. |
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fanto3k4 
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Joined: October-03-2010 Location: SoCal Status: Offline Points: 51 |
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 Topic: 90 Sport Nautique Overheating at High RPM.Posted: April-30-2012 at 7:07pm |
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1500 hours (last 300 in salt water). Recently replaced riser, exhaust manifolds, impeller, and thermostat. Can a tired circulating pump cause overheating at high rpms? All hose clamps, hoses, and strainer are in good shape.
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GlassSeeker
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Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Posted: April-30-2012 at 8:06pm |
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I think I would tighten all hoses/connections-air leak?
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This is the life
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fanto3k4
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Joined: October-03-2010 Location: SoCal Status: Offline Points: 51 |
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Posted: April-30-2012 at 8:15pm |
This is what I told my buddy to do. He said he checked but I will double check when I ski with him this weekend. I sold him the boat last year but still ski behind it several times a month. Because everything else has been replaced besides the circ pump I thought I would ask. The pump is not leaking out the weep hole so I am assuming its ok. |
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Bri892001
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Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947 |
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Posted: May-01-2012 at 1:55am |
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Skidim describes a test of the circ pump, among other tests here:
http://www.skidim.com/Faq_TROUBLESHOOT.asp#RWTS Try the bucket test. To me, a high rpm overheat vs. a low rpm kind of suggest a blockage in the flow of water somewhere. Trans cooler? It also came up recently in another thread, that at high rpms and engine was sucking one of the circulation hoses closed, because the hose was so deteriorated it couldn't hold itself open. Maybe not recommended, but maybe run it at speed with the engine cover removed and see if you can see any hoses collapsing. |
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fanto3k4
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Posted: May-01-2012 at 7:08pm |
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Great ideas... Will test this weekend!
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fanto3k4
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Posted: May-14-2012 at 1:15pm |
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It ended up being a loose hose at the trans cooler.... Thanks!
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Bri892001
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Posted: May-14-2012 at 1:19pm |
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Cool you got it fixed
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kenowja
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Joined: March-20-2012 Location: United States Status: Offline Points: 43 |
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Posted: May-16-2012 at 3:09am |
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thats good, had one of my friends have the same problem with their supra, and he fixed it. my other friend whose got the 198something reverse gel coat Ski Nautique 2001 had the same problem, and he found out he had a bad impeller in the pump
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Jake
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GlassSeeker wrote: