Haven is a 1966 32 with a 590E Dagenham engine. It was essentially rebuilt in 2014 (coolant in oil problem). In 2017 (at 506 hours on rebuilt engine) I had an overheating incident (temp gauge near 240). After that engine smoke was a little more than usual and it had a light ticking sound. Oil analysis showed no abnormal metal levels. Continued to use engine until 588 hours when valves were adjusted which eliminated excess smoke and the ticking sound. Engine ran great.
Recently out for 6 weeks up BC's central coast. On the way back down Johnstone Strait we had a valve guide break (abbreviated version of story). Limped into the only dock around and later got a 50 mile tow to Campbell River where the boat sits now (still 100 miles from home port in Sidney, BC). This happened at 838 engine hours.
I understand this engine is "sensitive to overheating" but I'm not sure what that means. What engine parts (if any) might have been compromised by the overheating? Valves and valve guides? Perhaps the valve guide break is not at all related to the overheating?
Our confidence level in the engine has been seriously eroded. Why would a 5 year old valve guide break? What about the others?
During the six weeks, we were in some very remote locations and we count ourselves very lucky that it happened where it did. Everything is on the table now including re-powering.
Does anyone have anything useful to contribute here?
Keijo and Susan
1966 Grand Banks 32 #17