Petty Officer 1st Class
- Apr 28, 2008
Good evening all. Purchased a 1986 Wellcraft 2900 Sportbridge, with dual mercruiser 350cid inboards. Each has a heat exchanger mounted on it. Rebuilding the heat exchangers now, and they look fine. But I am a bit alarmed at this yellow/green sediment under the thermostat, darn near clogging that area up. The boat has been sitting for a few years. Is this common? Thank you for any and all advice.