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2001 GT40 overheating

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  • 2001 GT40 overheating



    It started 2 weeks ago so I replaced the impeller (it was only 3mo old) but it was shredded. The next trip out it would overheat at slow speeds but drop to 160 above 5mph. I looked for air leaks and found my strainer bowl full of cracks. I fixed the bowl, double checked the impeller, and replaced the themostat. Took it out today and it jumped up to 200 degrees and this time driving faster would not cool it down.

    I flushed the lines from the bowl to the lake intake and the other way from bowl to raw water pump. Oil is fresh and full
    1. Could the regular on-block water pump cause this?
    2. Is it ok to run without a thermostat ?

    I'm hoping to get everything going tomorrow so I can hit the lake next Saturday...
    Ken
    2001 DD Air GT40

  • #2
    You don't think you may have accidentally installed the thermostat upside down. Did you remove the raw water pump? Put pump in upside down? Seal gone out in raw water pump? Tightened all hoses with nut driver not screw driver? You could remove hose from top of raw water pump and carefully start engine to see if it pumps water. Hope this helps, good luck.

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    • #3
      Good ideas, I'll take a nut driver with me tomorrow
      Ken
      2001 DD Air GT40

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      • #4
        Fgroce, I tightened it up with 1/4" ratchet and pulled the top hoselling but three was nothing. I poured water down the hose while it was off and cranked it back up and it started pumping fine -worked great the rest of the day even after being off for over 2hrs. I think tightening the connections fixed it but it needed help getting its prime. Thanks for the advice
        Ken
        2001 DD Air GT40

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