Patent ID: 8235759
Filing Date: 2012-08-07
Classification: B63H,F01P

Abstract:
1. A liquid cooled internal combustion engine having a cooling system circulating coolant liquid therethrough and having a coolant liquid flow passage with a drain port for draining of coolant liquid from said coolant liquid flow passage, said drain port being closable to block coolant liquid from exiting therethrough, and being openable to permit coolant liquid to exit therethrough for draining of coolant liquid from said coolant liquid flow passage, said coolant liquid flow passage being subject to carrying corrosion products of said engine, said drain port being subject to clogging by said corrosion products which prevent drainage of coolant liquid from said coolant liquid flow passage through said drain port even if open, a clog-preventing drain plug matingly engageable with said drain port and having closed and open positions, said closed position matingly engaging and closing said drain port to block said coolant liquid from exiting therethrough, said open position opening said drain port to permit coolant liquid to exit therethrough for draining of coolant liquid from said coolant liquid flow passage, said clog-preventing drain plug having an anti-clog protrusion finger extending through said drain port and into said coolant liquid flow passage when said clog-preventing drain plug is in said closed position, wherein said anti-clog protrusion finger extending into said coolant liquid flow passage permits flow of said coolant liquid therepast when said clog-preventing drain plug is in said closed position, such that flow of said coolant liquid through said coolant liquid flow passage is not blocked by said anti-clog protrusion finger when said clog-preventing drain plug is in said closed position.