This is one of those things you will usually know fairly quickly if you have a problem and how bad. As advised above, run it a while and check for water and drips where they shouldn't be. Then monitor the motor throughout the season.
I've never heard of anyone doing this but if you have just a small problem you can reroute the "plumbing" to temporarly make it a 'closed' system. Then dump some of that radiator sealant into the water-intake. Extra hose, a wash-tub and other materials will probably run you $50-ish. If it fixes the problem re-route everything back to normal and flush it. The down-side is that even if it works you might wonder if that little but of goop is going to blow through the crack/gap when you least want it to.
Good luck!
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