I'm new to the boating world. Just purchased a 1975 Cobalt 235 omc. This boat has been sitting for a couple of years. Have already worked out a couple of issues,... trim motor selenoid..... tilt motor replacement. I've had the boat in the water on the trailer to test run the engine, and this 351 purrs, but, while sitting idling for approx. 5-10 minutes temp rose to 180 and was climbing quick. Question is, is there a sure way to determine if the impeller is working either in the water or in the driveway? There is a hose connection on the right side of the upper case. Any help would be appreciated. Thanks
Last edited: