BoatBanter.com - View Single Post - Fresh-water flushing a raw water system?

On 27 Jan 2004 15:22:20 GMT, (JAXAshby) wrote:

larry, do that as you suggest on a Yanmar with a waterlift muffler and you will
cause some expensive to repair damage.

How? The engine is RUNNING during the flush. Feeding fresh water
into the stream into the RUNNING water pump simply replaces salt with
fresh. Any fresh water not pumped into the engine by the engine's OWN
water pump (whos impeller, by the way, meters how much water it passes
because my way has no hose pressure on it to speak of)...any excess
fresh water is simply fed backwards through the seawater strainer,
probably clearing it of the crap and run overboard unless the intake
or strainer is clogged, of course.

As the engine is RUNNING, there is no waterbox flooding or exhaust
backup because of the exhaust pressure of the engine. No excessive
water pressure is applied to the engine, any more than the water the
seawater pump on the engine imparts on it.

How's it going to destroy the engine this way. Simply turn off the
hose as soon as you stop the engine......before the seawater is pumped
through it, again.

You'd probably NEVER have to flush or core the cooling system if you
did it every time you used it.....even on closed systems with a heat
exchanger!

Larry W4CSC

Is it just me or did the US and UK just capture 1/3
of the world's sweetest oil supply? What idiot wants to
GIVE IT BACK?!!