Manifold Plug Broken

[Nvrgvup]

Took some time off from working on the trailer to go out on the water tonight with my boys.

When we got back I was looking over the engine getting my plan together for winterizing it since this is my first year with this boat.

I noticed one of the pipe plugs in the rear of the manifold was broken and the other ones torx was pretty mangled. Not leaking. Oh crap.

So do I need to get these out to properly winterize the engine or can I get antifreeze in there so it's not a problem? Or can I tip the boat forward enough to drain from the front?

Thanks!!!

[Chicago190]

In theory you don't need to drain the manifolds. I have no idea how much anti-freeze you would need to completely fill the manifolds with undiluted anti-freeze. After I drain the block and manifolds it takes 5 gallons of anti-freeze before it starts to come out the exhaust. I would at least double that amount to be on the safe side, but I would always be worried that the water in the manifolds diluted the anti-freeze too much.

Personally, I would fix the problem just for my own sanity.