Cold start where i could see tons of exhaust. Opened bilge and it looked like some exhaust floating straight up from exhaust mainfold. Didnt last too long at all. Assume exhaust manifold gasket leak. Or any other opinions?
Ayuh,..... Whatcha workin' on,..??..??
IDK what engine you are working on , but sure it could be a riser manifold , or any other connection point like the rubber exhaust hose mating up to another steel piece.
But I would take it very seriously and get it fixed ASAP , you could hydrolock your engine if water drains down through the leak and into the exhaust ports of your engine.
The last time you ran it , was the engine louder than normal ? sounds like the manifold is loose where its bolted to the head and that I would think make it louder than hell.
I believe it is safe from hydrolock now that its winterized
I would pick up some new exhaust manifold gaskets (manifold/ head) and also some new manifold / riser gaskets and tackle that job in the spring and give everything a good cleaning and visual inspection while it is off