"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?

When we were running the Volvo that was raw water cooled, there
was an attachment, in the water line inboard of the strainer that
allowed for flushing. About a quarter turn on the fresh water
hose was sufficient for enough cooling. It also worked when you
went to the hard for the winter as it was an easy way to get
antifreeze into the cooling system.

Leanne