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Gene Kearns Gene Kearns is offline
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First recorded activity by BoatBanter: Jul 2007
Posts: 932
Default Flushing an outboard motor

On Sat, 05 Jan 2008 21:43:08 -0500, penned the
following well considered thoughts to the readers of rec.boats:

On Sat, 05 Jan 2008 20:44:11 -0500, HK wrote:

My last Merc and Yamaha and my current Yamaha have a hose mounting at
the powerhead for flushing.


That connects to the water manifold but water will not get into the
engine until the thermostat opens ... according to the Merc shop
manual


I think we are talking apples and oranges.

If the engine has not been factory equipped with a fresh water
flushing fitting.... the engine *must* run when flushing.

With a factory fitting, the water is introduced on the "hot" side of
the thermostat.... that is why you *cannot* run these engines during
flushing. You are trying to force water into the outlet of the
pump.... that doesn't work.

--

Grady-White Gulfstream, out of Oak Island, NC.

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