if its a R engine there is that water port between the intake runners for #2 and #3
i had a leak on that little pipe that drove me nuts for awhile
besides that, use a very small flat screwdriver and kinda poke at the freeze plug if it feels soft
![Yikes :yikes:](https://board.marlincrawler.com/Smileys/marlin/yikes.gif)
but just pull it out with a heal bar or something and tap some new ones in, the worst case you would have to pull the intake but not the engine