is a 1979 30' O'day, with a raw water
cooled Yanmar 2QM15
with about 930 hours. We bought her about 18 months ago. Last season, I added a Groco sea strainer and replaced the raw water
hoses. We had no issues. At haul out
time, the intake strainer of the thru hull
was nearly clogged with Zebra mussels. I replaced the strainer with a mushroom thru hull
, thinking that if I had to, I could disconnect the hose inside and use a dowel rod to knock the little Zebra buggers loose.
This season, I've had 2 incidents where I was not getting cooling water
. Both times we were returning to the dock
after some "spirited" sailing. The first time, we were healing about 20 degrees when I started the motor
. No water
burping out the exhaust
, even with a blip of the throttle. I shut her down, replaced the water pump
(with a new impeller in the back up pump), and still had no cooling
. I disconnected the intake hose from the strainer & blew a bit of air into the hose, which seemed to cure the problem.
Everything worked nicely for 4 or 5 more outings.
Last night we were out & sailed into flat water before starting the motor
. I was tired & didn't check for water burping from the exhaust
. A few minutes later I got overheat alarms & shut down the motor. Sailing into my slip was extra fun. We secured the boat
& went home.
This morning, I went to the boat & inspected my strainer. It's completely clean. I have good water flow when I removed the drain plug
& the top cover. I started the motor & all seems OK.
Is this a case of user error/ignorance? Should I be doing something different?
Or, is this more likely a plumbing/mechanical thing I can fix? Any ideas on how to proceed?