Reply To: CD12 strange cooling issue

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June 28, 2025 at 12:32 pm #297687
CHUCK
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    I’ve been reading all this with interest and sympathy!  I’ve been there as well….mostly with Mercury.

    One thing that it doesn’t appear that you’ve done is to hook up a water source  (garden hose) to the copper tube;  gearcase removed and powerhead installed with the proper gasket.  Turn on a gentle flow and observe what happens.  If you get consistent flow….it would point to some sort of issue with the impeller housing….maybe something like Crosbyman found .