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  1. S

    Frustrating Cooling System Issues

    we just replaced the outdrive because the gears on our old one got all chewed up. i have to wonder now if the flapper was the culprit. Do you know if it's possible to inspect/replace the flapper without removing the exhaust riser?
  2. S

    Frustrating Cooling System Issues

    thanks for your response! when i saw all that exhaust pumping out of that hose I was like "this doesn't seem right". Going to inspect the exhaust flapper next.
  3. S

    Frustrating Cooling System Issues

    Hello fellow gluttons for punishment, I have a 1976 MerCruiser 165 I6 with a closed cooling system that just doesn't want to cool. We have replaced the impeller, all the hoses, the t-stat, the exhaust riser, the exhaust manifold, de-scaled and cleaned out the heat exchanger, pulled the hose off...
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