We now run the blower while motoring, helps keeping the alternator, tranny and motor cooler. Plus if something happens, like smoke or fire in the engine compartment you will know sooner.
Try this, warm up engine, shut off. Shut hull valve. Pull SW intake hose off and place hose in white vinegar. Start engine run till the gallon is almost gone and let it sit 15 min. Then repeat. Reconnect hose and run for 10 minutes. You might need a funnel to feed the vinegar in, depends on the condition of your SW pump.
A backflush with freshwater is a good idea. I found some impeller pieces that way. Inject water on the outlet side of heat exchanger. You can disconnect the inlet hose and dump in bilge. DO NOT INSTALL A HOSE TO INLET OF HEAT EXCHANGER. Quick way to kill a motor with a hydro-lock.
Also last resort, take off and take to radiator shop. Dip and pressure test. Make certain rubber end cap is installed correctly.
_________________ Hull #208, Puff Card Southern Chesapeake Bay
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