MaurFishin'
Recruit
- Joined
- Jul 3, 2005
- Messages
- 3
I apologize upfront for the length of this, but my problem is a little involved.<br />I own a pair of 2002 F225 4 strokes with 650 Hrs on a 28Ft pursuit CC that have been dealer serviced. Used in Salt Water-boat stored on lift and engines flushed/maintained religiously. Externally engines have no signs of corrosion and look new. They run perfectly. <br />UNTIL, I got an overheat alarm on port engine at idle only (I have temp ga's and water press ga's also). At any speed other than idle, engine cooled down to almost normal and engines ran flawlessly. After checking all obvious stuff, the dealer & yamaha diagnosed a leak in gaskets/water passages going up to the Power head (PH) that kept water from getting there at idle speeds. They pulled PH & saw corrosion/erosion in these "dry exhaust" areas starting 1/2 way down the upper exhaust guide down thru lower exhaust guide,oil pan,exhaust manifold. All these parts need to be replaced.<br />My frustration is Yamaha's explanation of Why this happened. Yamaha says it was due to lack of maintenance (corrosion) and to prevent recurrance, the only suggestion was to use "Ring Free" <br />I don't agree with their diagnosis.<br />How can corrosion start at the upper exhaust guide when this is a "Dry exhaust" area? Does enging flushing reach this area? I think it may have been a coating or an assembly problem maybee even electrical leaks causing galvanic corrosion. Does anyone have experience seeing this kind of damage and what do you think could have caused it? Yamaha will not divulge this information-possiblly due to potential recall liability.<br />Thanks alot-<br />Maur Fishin'<br />I have letters/pictures sent to yamaha but to no avail.