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JohnP
Master Marine Consultant

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1520 Posts
Initially Posted - 06/29/2024 :  11:44:10  Show Profile  Reply with Quote
I have had a Tohatsu 9.9hp motor for 3 years now, and I flush the brackish water out of the engine block and impeller with fresh water each time I go out. The telltale flow became reduced this spring. I stuck a sturdy wire an inch or so into the hole to discover it's blocked and cannot be cleared using a wire like that. I surmise that after the telltale tip got blocked, other debris collected behind it.

Could I get access to that tubing, remove it, and clear it out? It's way down in the motor.

Could I ream out the tubing by inserting and rotating a bent wire or the tip of a steel needle?

Air pressure? Push it backwards with water pressure?
JohnP
1978 C25 SR/FK "Gypsy"
Mill Creek off the Magothy River, Chesapeake Bay
Port Captain, northern Chesapeake Bay

Voyager
Master Marine Consultant

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USA
5320 Posts
Response Posted - 06/29/2024 :  15:28:05  Show Profile  Reply with Quote
When was the last time you replaced your impeller? That’s the heart of the waterpump keeping your outboard engine cool and flushed with seawater as you motor around.

You’re right, you might just have a clogged water outlet (telltale), you could have something stuck in the engine flush fitting, or the impeller might have failed. Any way you slice it you do not have any water pumping through the block while you’re running. This will make your engine overheat. That could be fatal for the engine.

I wouldn’t run it until I got to the bottom of the problem.
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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Voyager
Master Marine Consultant

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USA
5320 Posts
Response Posted - 06/29/2024 :  17:16:30  Show Profile  Reply with Quote
You might find a replacement from your local marine parts house, or from a website like Boats.net
Bruce Ross
Passage ~ SR-FK ~ C25 #5032

Port Captain — Milford, CT
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.