Bilge pump failed on my boat and dog house filled up with water half way up motor,Checked oil has lots of water in it. {never started motor with watery oil}:I will change oil till all signs of water is out of it. Just need to know what else to check for? And I pulled spark plugs no sign of water there. Also wondered where is the point of entry for water to get in oil? Sorry if I dont respond back fast I work out of town and I will believing soon. 5.0 mercruiser 228