Join Date: May 2008
Location: Los Angeles area
Thanked 1 Time in 1 Post
Rep Power: 8
Jason, try the oxolic acid trick, it worked for me. Get some of the acid at WM or some other place. Mix it up in a 5 gallon bucket. Disconnect the bypass hose that runs from the thermostat back to the raw water filter, at the filter end. Remove the thermostat and re-install the thermo cover. Hold the unattached end of the bypass hose above the motor and insert a funnel into the hose. You are now going to slowly pour the acid solution into this hose so that it enters your motor from the top. Before adding the acid, be sure to disconnect and plug the hose that runs from your water pump outlet to the bottom of the engine. I think the acid solution, although mild, might do harm to your impeller and pump. Let the acid solution sit in your block for a while and then reattach all hoses (you can install the thermostat later, just don't forget). Make sure your cooling intake thru-hull is open and start your motor. This should work. If it doesn't, try using a tapered brass nozzle on a garden hose and insert it into the end of hose that you have detached from your water pump outlet. You may also want to pinch off the return hose so that the water pressure doesn't push everything back to your raw water strainer. If you finally get water to exit your exhaust outlet while under power, you are almost finished. Re-install your thermostat (after checking to see that it operates properly) and re-connect all the hoses. Now go and motor around a while and make sure that water is still exiting out the back of the boat. I ended up installing a plastic ball valve in my return line so that I could regulate how much water bypasses the system.
I hope this helps. Send me a PM if you need more info.
Odyssey, '79 CSY 44 Cutter
Channel Islands, CA
"There is no unhappiness like the misery of sighting land (and work) again after a cheerful, careless voyage."