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The fouling I'm seeing is mostly rust with soot. Pretty hard stuff. I spoke to a Yanmar service engr and he says cooling water is the issue but we've no choice as we need it to cool the hot flue. There's another problem. In reviewing my maintenance records, it seems the failure/leaking of seawater cooling pump corellate with fouling of the mixing elbow. So the foul elbow not just created back pressure, shooting some carbon out via air intake filter, destroying the filter element and staining the engine compartment, it also back pressure the Johnson CW pump causing it to leak at the oil seal. Now failures seems to fall in place as results of the mixing elbow fouling.
The fouled up mixing elbow exhaust hole is not even a quarter the size of a new one. That must have created alot of back pressure.
From reading above replies, I gathers I'm resigned to taking out the elbow for cleaning every 6months to a year. My records also shows I've this fouling problem every 2 years. Hopefully preventive maintenance will extend the replacement period. Just wonder how much of the Injectors contributes to thsi fouling problem.
Thanks for replies.
2002 Hunter 326, SV Millennium 2
1999 Macgregor 26X, SV Millennium
Last edited by trantor12020; 12-07-2010 at 09:18 AM.