Comments below:

"Jeffrey P. Vasquez" wrote in
message ...
Hi all,

I am advised to flush a raw-water cooling system on a Yanmar 2GM with
fresh
water. I have a couple of questions on execution to any kind soul that can
offer some advice.

I'm thinking of running a dock hose down and hooking it up to the hose
coming off the through-hull intake, turning the faucet on, starting the
engine and just letting it go. However, I'm concerned about overpressuring
the system and filling the water lift to the point it dumps into the
engine. Is this a valid concern? Is there a better way to accomplish this?
There's always positive pressure on the system from the through-hull
anyway, so I'm assuming as long as I'm pressurizing it from upstream of
the
water pump, I'm safe. True?

Many thanks,

Should work but...

We usually do this by extending the thru hull hose with another short piece
of hose up into a 5 gallon bucket set in the cockpit. We then start the
engine and let the raw water pump move the water through. We keep the
bucket full by leaving the dock hose running into the bucket, if it
overflows it just runs out the cockpit drains. No chance of
over-pressurising anything or damaging your raw water pump. As we live in
Canada and so have to winterise this system, we then throw some antifreeze
into the bucket and let that pump through until it starts to come out the
exhaust, shut it down and that's it for the season.
--
Ken Heaton & Anne Tobin
Cape Breton Island, Canada
kenheaton AT ess wye dee DOT eastlink DOT ca