Paul - I have a 33 and use the procedure you described for many years. I make sure that the engine is up to operating temperature, close the seacock, open the strainer, pull the strainer, and pour the anti-freeze in until to comes out of the exhaust. Two things come to mind re your problem: (1) with the engine running, pour it in so that the strainer is full at all times to assure that the engine is not sucking air: (2) if that doesn't work, check and make sure that your impeller is not damaged and that there is no leak in the raw water system. Let me know if this helps.
Byron Higgins Lavieve Hull #444
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