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Thread: Running hot

  1. #1
    Sun burners
    This past weekend I took my boat out and the water temp went up to about 200, had some drinks in the bay let it cool down went back in, let it sit and before my eyes temp goes down to about 120 so I cruise the boat all day. Let it sit for lunch same thing over 200 let it sit for 15 to 20 minutes goes dow to about 120 again. Any ideas on what would do this to my 502 when it runs it runs good,,, Thanks Sb

  2. #2
    mister460
    200 deg isn't that hot. Probably the heat in the block just soaking into the cool water when you shut it down. I've seen it happen before. As long as it doesn't get overly hot while running I wouldn't worry about it. Good luck!

  3. #3
    gnarley
    Sounds almost just like what I had! Mine would climb to 180 under power then idle for 10 minutes back down to 120. I pulled plugs & found water in #7 then pulled the head & found a very defined blown head gasket where the sealing ring had a direct path to the water jacket. I cleaned everything check for straightness & reassembled then tested. No more overheating

  4. #4
    Sun burners
    Had little rocks in the oil cooler water line thingy cleared the rocks out drove it for about an hour Sunday seemed to be OK!

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