Hello all
I have an elderly Yanmar 3GMD engine that is raw water cooled. It has plugged twice in the last two years where the water goes through a knuckle into the mixing elbow. The first time (summer before last) was some solid bit that had gotten stuck - how it got there I don't know. The last time (last week) was due to a tar like substance gumming up the knuckle. Easy to clear and I was on my way, but is this a harbinger of something more serious. I took the mixing elbow off a few years back and cleaned it, guess it is time to do that again. Is the plugging coming from the exhaust and working its way into the knuckle - for example unburned diesel? Thanks for any insight. Don
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