Assuming Lehman 120? Then I would say the seal is leaking and you need a new coolant circulation pump.
I replaced mine once, not difficult to do, but you have to drain all the antifreeze out.
If it's been more than a few years since the coolant has been changed then it's due anyway. Also might as well put on a new belt.
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Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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