Boat is a 1977 Islander 26 with an OMC Zephyr Saildrive. I have no cooling water ouflow at thru hull, but good circulation through power head and thru the hose to the manifold. Not sure where it is plugged and the exhaust riser bolts are seized. I will work on running down the location of the blockage, but any suggestions are welcome.
Now, a sanity check. I need to move the boat from the eastern shore of the Chesapeake to the western shore before the end of the month. If i can't locate and clear the blockage,any reason I can't simply put an extension on the outflow hose and lead it (carefully and securely) overboard? Most of the trip should be under sail, but I need to motor through a couple of areas.
Sorry, I don't have any suggestions to offer but I wanted to post a reply since I seldom come across another 77' Islander 26 owner. I've owned my Islander for over 20 years and still believe it's a great boat. The only thing I didn't care for was the OMC Sail Drive. Even with zinks the aluminum lower unit was an issue. About 15 years ago I pulled the saildrive and glassed over the bottom. I added a 15 h.p. extra long shaft outboard. I replaced the old fuel tank with a plastic one and ran the line through stern to the outboard so wouldn't have to deal with a portable tank in the cockpit. The old tank was aluminum and was clogging my fuel filter with a powder substance even though I pulled it once and flushed it out.
Anyway that's the only complaint I have after all these years. My boat is located in a slip in Southern California. You own a very nice boat , enjoy and treat her well. If you have any other Islander 26 questions let me know and I'll try to help. The Islander 26 was one of Robert Perrys early designs, shortly after he designed the the Islander 28. Another very fine boat.