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,