old guy :)
Join Date: Feb 2008
Location: Fredericton, NB, Canada
Thanked 14 Times in 12 Posts
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I have owned my first water cooled Yanmar 2QM20H for just one year. People have told me that they are a great engine - "almost bullet proof" was one comment.
Because we were taking her 1000 nautical miles, I wanted to have it checked over and get a few things done first. The survey said to replace the stuffing box hose and suggested that we replace the engine mounts. (I was later told that that surveyor always says to replace the engine mounts).
We opted for replacing the stuffing box hose, BUT - the mechanic could not get the shaft off the shaft coupling. Long story short - had to pull the engine to replace that hose. While pulled, I had him replace the mounts. Also replaced the impeller and the zincs. (Doing the impeller and zincs were so easy it will be an annual thing for me now). I did both fuel filters and found a problem with the external fuel pump and replace that as well.
All in all, about $!200 in parts and labour.
But, we started her up and she ran like a top for 1002 miles home. No problems (other than changing the external fuel filter, for the rest of the summer either. She burns less than a 1/2 gal per hour at 2500 RPMs at hull speed and we are really pleased.
I am considering putting on a heat exchanger (to make her fresh water cooled and to increase the temperature of the liquid going through the domestic water heater). But the jury is still out on that job.
Access is good and she is a pretty simple engine.
That's my limited experience two cents worth.
Irwin Citation 34